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WO1997017182A1 - Procede de fabrication d'un article optique utilisant le rayonnement de lumiere visible - Google Patents

Procede de fabrication d'un article optique utilisant le rayonnement de lumiere visible Download PDF

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Publication number
WO1997017182A1
WO1997017182A1 PCT/BE1996/000119 BE9600119W WO9717182A1 WO 1997017182 A1 WO1997017182 A1 WO 1997017182A1 BE 9600119 W BE9600119 W BE 9600119W WO 9717182 A1 WO9717182 A1 WO 9717182A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
mold
composition
visible light
curing
Prior art date
Application number
PCT/BE1996/000119
Other languages
English (en)
Inventor
Peter Weissman
Original Assignee
Ucb, S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ucb, S.A. filed Critical Ucb, S.A.
Priority to AU75576/96A priority Critical patent/AU7557696A/en
Publication of WO1997017182A1 publication Critical patent/WO1997017182A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0888—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/56—Compression moulding under special conditions, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G02B1/043—Contact lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0833—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using actinic light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses

Definitions

  • the present invention relates generally to methods for curing optical articles and more particularly to methods for producing ophthalmic lenses. It is conventional in the art to produce optical lenses by thermal curing techniques from either allyl, methacrylate, acrylate or vinyl functional monomers and/or oligomers. The thermal curing techniques for polymerizing these materials to produce optical lenses have several disadvantages. The most significant drawback is that it may take between 6 and 20 hours to produce a lens. Classically, a lens forming mold is capable of producing two lenses per day.
  • UV ultraviolet light
  • Tg glass transition temperatures
  • polymers formed via radical reactions are capable of achieving Tgs greater than the temperature at which they were cured.
  • these materials are frequently quite yellow at the end of their cure cycle. This is due to the trapping of radicals that are produced after the material passes through the vitrification temperature but before exposure is terminated. This lack of mobility during the final stages of cure, limits the extent of cure.
  • UV cured lenses are actually cured using two different initiators. One is UV activated and the other is thermally activated. The lenses are partially cured under high intensity UV light and are then placed into an oven and thermally cured to completion.
  • a final difficulty with UV cured lenses is keeping air from entering the mold during the cure cycle. Because the cure and the shrinkage associated with the cure process occurs so rapidly, it is difficult to keep the molds sealed and eliminate air from entering the mold cavity during the cure cycle.
  • a metal clamp is placed on the mold in order to keep the mold sealed during cure, but UV cured lenses must use a transparent clamping mechanism, if they can use one at all.
  • disadvantages of methods of curing optical articles involving the use of ultra-violet light are the need for specific equipment, namely expensive light sources, dangerous working conditions for the personal handling such apparatus, as well as the overall length of such methods. Therefore it is an objective of the present invention to solve the various defects of the hitherto known methods of curing optical articles.
  • the present invention provides a process for curing optical articles, in particular ophthalmic lenses, which involves the use of a specific wavelength range of visible light. This light causes no degradation of the polymer material during the cure cycle. Since UV light is not employed, the environment is much safer for the workers involved in the process.
  • the articles, particularly lenses may also be heated during the cure cycle. However, no thermal initiator is used and the visible light exposure, optionally in conjunction with heat, is critical to developing the appropriate
  • optical article is defined as an object that is designed to transmit, focus, defocus, block or otherwise act to interact or prevent interaction with electromagnetic radiation that ranges from a wavelength of about 250 nm to about 1200 nm, preferably from 300 nm to 900 nm, and more preferably from 380 nm to 750 nm.
  • Cure and “curing” Applicant means to cause the chemical reaction of lower molecular weight species such that after they react their molecular weight has significantly increased.
  • To "actively heat” means to cause an increase in temperature by either electromagnetic radiation, specifically infrared radiation or microwave radiation, radiant energy or convective energy.
  • the method is applicable to the manufacture of optical articles, in particular ophthalmic lenses, from a wide variety of materials, including virtually any double-bond containing materials which are radiation polymerisable.
  • suitable materials include various acrylates, methacrylates, vinyl ethers, oxethanes and allyls, although allyls tend to react more slowly. More specifically, they generally consist of a mixture of tne following reactive components. - at least one radiation polymenzable oligomer or reactive prepolymer, with a molecular weight of generally less than about 10,000 and having unsaturated groups such as acrylic, methacrylic, vinyl or allyl chain -.erminating or side groups.
  • Such oligomers or prepolymers are well known, available commercially and can provide a great variety of structures such as polyesters, polyacrylics, polyepoxides, polyurethanes, etc.
  • Examples include epoxy acrylates or methacrylates, of the type described in U.S. Patent Nos. 3,676,398, 3,770,602 and 4,511,732, urethane acrylates or methacrylates, such as those described in U.S. Patent Nos. 3,700,643, 4,133,723 and 4,188,455, polyester acrylates or methacrylates, such as those described in U.S. Patent Nos. 4,206,025 and 5,002,976, and acrylic acrylates or methacrylates, etc.
  • polyethylenically unsaturated reactive monomer preferably a di(meth)acrylate or a poly(meth)acrylate of a low molecular weight polyol, such as a diacrylate of 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, di-, tri- and/or tetraethylene glycol, tripropylene glycol, the
  • At least one monoethylenically unsaturated reactive monomer wnich contains a single ethylenically unsaturated group per molecule.
  • Such monomers include monoacrylates and monomethacrylates of monohydroxylated and polyhydroxylated aliphatic alcohols, styrene, vinyl toluene, vinyl acetate, N-vinyl-2-pyrrolidone, N-vinylpyridine,
  • N-vinylcarbazole and (2-oxo-1-pyrrolidinyl)alkyl (meth)acrylates.
  • This monomer may be added to the composition as a reactive diluent and the amount and nature thereof can be varied to allow the viscosity of the composition to be adjusted at will.
  • Oligomer formulations which can be mentioned as examples oligomer are as follows: U. S. Patent No. 5,442,022 discloses a composition based on echoxylated bis-phenol A dimethacrylate; U. S. Patent No. 5,502,139 disclose a composition based on fluorene di(meth)acrylate monomer; U. S. Patent No. 5,147,959 discloses the reaction product of a polyisocyanate with a halobisphenol A epichlorhydrin polycondensate-(meth)acrylic acid adduct; U. S. Patent No. 5,132,384 discloses resins based on
  • U.S. Patent No. 5,133,370 discloses mixtures of (a) polybutylene glycol diacrylate, (b) a urethane polymethacrylate and (c) an aromatic or alicyclic mono (meth) acrylate;
  • U. S. Patent No. 4,912,185 discloses a composition of (a) a polyoxyalkylene glycol di(meth)acrylate, (b) a trifunctional (meth) acrylic monomer and (c) a polyacrylic urethane monomer.
  • International Patent Publication No. WO96/26184 discloses polymeric compositions for the preparation of optical grade materials specifically formulated from
  • urethane (meth) acrylate which comprises the components (a), (b), and (c): (a) an organic isocyanate having at least two isocyanate groups;
  • R 1 is a hydrogen atom or a methyl group
  • R 2 is independently a hydrogen or an alkyl group having a carbon number ranging from 1 to 10
  • R 3 , R 4 and R 5 are independently a hydrogen, an alkyl group having a carbon number ranging from 1 to 10, a phenyl group or bromine
  • nl is an integer ranging from 1 to 7
  • n2 is an integer ranging from 0 to 20
  • R. and R b are independently a hydrogen or a methyl group
  • n3 is independently an integer ranging from 0 to 10
  • n4 is 0 or 1
  • n5 is an integer ranging from 0 to 5.
  • compositions employed in this aspect of the invention may also contain UV stabilizer materials since the curing is carried out by employing visible light. This constitutes an additional advantage of the present invention since the UV stabilizer can be
  • the wavelength of the visible light used in the method of the invention can vary between approximately 385 and 475 nm, with a preferred range of approximately 400 to 450 nm and a particularly preferred wavelength of approximately 420 nm.
  • the advantage of using such actinic light is that at a wavelength of 420 nm they cause virtually no degradation of the optical article during the process of curing.
  • the examples set forth below clearly demonstrate that by heating the article for a sufficient period of time to a temperature at or slightly above the polymer's ultimate glass transition temperature while continuing its exposure to visible light, according to a preferred embodiment of the invention complete cure can be obtained.
  • slightly above the glass transition temperature is meant to a level of up to about 30°C above such temperature (which usually ranges from about 60° to about 160°C)
  • a thermal initiator consequently is not needed to obtain complete cure of the article while using the process of the invention.
  • Fluorescent Super Actinic light from Philips or its equivalent from another manufacturer
  • 420 nm Metal Halide lamps from Electrolite Corporation. This should be used in conjunction with Uvilex 390Z UV Barrier Filter Glass from Schott Corporation. This filter glass will eliminate wavelengths below about 385 nm.
  • the process of the invention is carried out using a photoinitiator suitable for use with the particular optical article material which is intended
  • the photoinitiator must be one which possesses an absorption peak at or about the same wavelength as that of the visible light which is employed in the curing process
  • Preferred photoinitiators are Lucirin ® TPO (2,4,6-trimethyl-benzoyldiphenylphosphine oxide) from BASF, Irgacure 184 (1-hydroxycyclohexyl phenyl ketone), Darocur 1173 (2-hydroxy-2-methyl-1-phenyl-propan-1-one), bis(2,6-dimethoxybenzoyl)-2,4,4- trimethylpentylphosphine oxide from Ciba-Geigy and mixtures thereof
  • the molds which are employed in carrying out the curing method of the invention are well Known in the art For example, there can be mentioned a glass mold held together by a polyvinyl chloride (PVC) gasket Other molds will be apparent to the art-skilled. The mold must, of course, be such that it is penetrable by the visible light which is employed in curing.
  • PVC polyvinyl chloride
  • Fig. 1 is a schematic diagram of a lens curing apparatus.
  • Fig. 1A is a front view showing lens molds (1) sitting in vertical position on the lens support (2) of the lens curing apparatus.
  • Fig. 1B is an end view of the lens support mechanism (2) along with the actinic light assembly and halogen lights for providing heat to the lens mold (1).
  • (3) denotes a halogen track lighting which is holded by a movable bracket (4)
  • (5) denotes a fluorescent light fixture with actinic lights mounted on a L bracket (6).
  • Fig. 2 is a schematic of an alternative apparatus for carrying out the inventive method employing convection heating.
  • the upper chamber thereof comprises a cooling fan (7) and an exhaust port (8) and is provided with a series of fluorescent light fixtures (5) with actinic lamps and with a reflector (9) for actinic lights.
  • the upper chamber is separated from the lower chamber by a heat resistant glass plate (10).
  • the lower chamoer is provided with a heating element (11), with a heat resistant glass plate (12) on which the lens molds (1) are set, and with a reflector (9') for actinic lights.
  • Fig. 3 is a schematic of another alternative apparatus for carrying out the inventive method employing infrared heating.
  • This alternative apparatus comprises elements similar to those of the apparatus of figure 2, except that the lower chamber is not provided with a heating element but instead comprises a series of quartz infrared lamps (13) near the separating heat resistant glass plate (10).
  • halogen lamps are held approximately 20 cm from the lens molds.
  • the halogen lamps are on a track (3) so that they can be easily moved to match two lamps (one on eacn side) per lens mold.
  • the halogen lamps are moved up and out of the way (as shown) during Phase I of the cure cycle.
  • Phase I the fluorescent lamps are turned on and curing begins.
  • Phase II the halogen lamps are moved vertically down so that the centerline of the halogen lights corresponds with the center of the lens.
  • the lamps are turned on and heating begins while the visible light curing also continues.
  • the visible light curing is begun by turning on the fluorescent lights. After a desired period of time, the heating element is turned on and visible light continues with heating until the desired cure is obtained.
  • a method of curing in which an optical article mold, preferably an ophthalmic lens mold, containing the composition to be cured is sealed in a clear plastic container, preferably a bag, under vacuum, prior to curing and curing takes place with the mold thus sealed.
  • an optical article mold preferably an ophthalmic lens mold
  • a clear plastic container preferably a bag
  • Vacuum as used herein means a vacuum greater than about 400 mm Hg (i.e. a pressure below 360 mm Hg) as measured by standard vacuum gauge, more preferably greater than 600 mm Hg.
  • Sealing of the mold in this manner has the beneficial effect of exerting pressure on the mold to hold it together while, at the same time, preventing air from entering the mold cavity during the cure cycle
  • the mold containing the composition to be cured is first placed into a bag made of a suitable clear plastic material.
  • a tube is inserted in the bag and the open end of the bag is sealed, for example, with a commercially available heat sealer, up to the inserted tube
  • a vacuum is then pulled on the bag, causing it to collapse around the mold.
  • the heat sealer is then used to seal the bag in front of the inserted tube.
  • This technique can be automated using equipment specifically designed to vacuum bag or seal materials on an industrial/commercial scale.
  • the plastic film that the mold is sealed into is not necessarily provided as a bag. Frequently these materials are sold on rolls in what is termed a "C Fold" configuration. In this case, a length of film is unrolled and the edge coming off the roll is sealed using a heat sealer.
  • the mold is then placed between the two layers of film, i.e , in the C Fold.
  • the film is then typically sealed and cut simultaneously on the other side of the mold.
  • the mold is now "in a bag” with one end open That end is then sealed and a vacuum is pulled as described above.
  • the particular mechanics of the operation are not critical but rather that the end result is the mold encased in a clear film under vacuum. Any method to achieve this end is acceptable
  • Adhesive sealing is acceptable so long as the vacuum conditions are achieved and maintained.
  • Heat sealing is, however, preferred
  • composition to be cured will comprise the photoinitiator and optionally photosensitizer or, respectively, the thermal activator which are suitable for such curing technology
  • Non-limiting examples of suitable materials for the bag are low and high density polyethylene, polybutylene, polyvinyl chloride, polypropylene copolymers of ethylene and higher ⁇ -olefins such as propylene or 1-butene, copolymers of ethylene and alkyl acrylates or methacrylates and optionally maleic anhydride, etc.
  • the films may also be coextruded films such that the inner film is designed to be easily sealed while the outer film provides the majority of the mechanical properties. Such coextruded films are well known in the packaging art.
  • the bag or film must be flexible, clear, and - if it is to be used in the process of curing with visible light - transparent to light in the range of approximately 385 to 475 nm, preferably approximately 420 nm. It is also preferably heat sealable
  • the bag or film may also, if desired, be cnosen to provide additional protection against UV light if it is made of polymer or contains additives that absorb UV light.
  • a casting composition was prepared from a mixture of
  • the oligomer composition comprises a urethane acrylate which is the reaction product of diphenylmethane dusocyanate and hydroxypropylacrylate in a 1:1 molar ratio, a photoinitiator (Lucinn TPO from BASF), a UV stabilizer and an antioxidant.
  • the modified thiol is a functional product that can be prepared by thermal initiation from 4 equivalents of
  • the above components were mixed together in a brown polyethylene bottle The material was allowed to degas overnight.
  • the formula was poured into a glass mold held together by a polyvinyl chloride (PVC) gasket.
  • PVC polyvinyl chloride
  • the mold was set between two sets of fluorescent actinic lights (420 nm) (Phillips Corporation) approximately 60 cm apart. The lights were turned on. After twenty minutes, a pair of 75 watt halogen lamps directed at the mold were turned on.
  • the lens was cured for an additional 30 minutes. At the end of this cycle, the lens temperature was approximately 95°C
  • the lens was clear and almost colorless at this point.
  • the mold was then disassembled and the lens removed.
  • the lens was cleaned and then placed in a 100°C oven for 15 minutes. This annealing cycle is performed only to allow the stress induced in the demolding process to be relieved.
  • the lens was then removed from the oven and allowed to cool to room
  • the lens exhibited very low color and very high clarity
  • the polymerized material was found to have a refractive index of 1.574 at 20°C and an Abbe number of approximately 33.
  • the glass transition temperature was approximately 90°C.
  • the power of the lens was measured to be
  • This lens passed the dress lens impact test.
  • Example 1 The material and mold were prepared as in Example 1.
  • the initial actinic cure cycle was 20 minutes but the secondary cure with the halogen lamps was modified so that the temperature of the lens at the end of the second cure cycle was only about 75°C. This time the lens was very yellow when it came out of the cure cycle.
  • Thermal post annealing as described in Example 1, did decrease the color of the lens to a similar color as the lens from Example 1.
  • the polymerized material was found to have a refractive index of 1.574 at 20°C and an Abbe number of approximately 33
  • the glass transition temperature was approximately 85°C.
  • Example 1 The material and mold were prepared as in Example 1. However, this time the lens mold was placed in a flexible, clear, transparent to 420 nm light and heat sealable polyethylene bag. A tube is inserted in the bag and the open end of the bag is sealed with a commercially available heat sealer up to the inserted tube. A vacuum is then pulled on the bag, causing it to collapse around the mold. The heat sealer is then used to seal the bag in front of the inserted tube. The lens was then cured as in Example 1 The lens had no bubbles as a result of air entering the mold cavity during the cure cycle.
  • Example 4 A casting composition was prepared from
  • the above components were mixed together in a brown polyethylene bottle .
  • the material was allowed to degas overnight.
  • the formula was poured into a lens mold consisting of a front curve of 200 mm and a back curve of 400 mm.
  • the two halves of the glass mold were held together by a PVC gasket that provided a distance between the edges of the glass molds of 3.5 mm. This resulted in a lens with a center thickness of approximately 1.2 mm.
  • the mold was then vacuum sealed in a polyethylene bag as described in Example 3. It was then set between two sets of fluorescent actinic lights (420 nm) (Phillips Corporation) approximately 60 cm apart. The lights were turned on. After ten minutes, a pair of 75 watt halogen lamps directed at the mold were turned on. The lens was cured for an additional 30 minutes.
  • the lens temperature was approximately 95°C.
  • the lens was clear and almost colorless at this point.
  • the mold was then disassembled and the lens removed.
  • the lens was cleaned and then placed in a 100°C oven for 20 minutes. This annealing cycle is performed only to allow the stress induced in the demolding process to be relieved.
  • the lens was then removed from the oven and allowed to cool to room
  • the lens exhibited very low color and very high clarity.
  • the polymerized material was found to have a refractive index of 1 50 at 20°C and an Abbe number of approximately 52.
  • the glass transition temperature was approximately 67°C.
  • the power of the lens was measured to be
  • This lens passed the dress lens impact test.
  • a casting composition was prepared from
  • the lens exhibited very low color and very high clarity.
  • the polymerized material was found to have a refractive index of 1.50 at 20°C and an Abbe number of approximately 52.
  • the glass transition temperature was approximately 80°C.
  • the power of the lens was measured to be
  • the following formulations were made and cured into lenses.
  • the lenses were cured for approximately 15 minutes using actinic light only.
  • the intensity of the actinic lamps was approximately 3200 micro watts per square centimeter and the exposure occurred from both sides of the molds.
  • a thermocouple was inserted in each lens and the cure response was noted.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Thermal Sciences (AREA)
  • Toxicology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Cette invention se rapporte à un procédé de fabrication d'un article optique, de préférence un verre ophtalmique, qui utilise un rayonnement visible de longueur d'onde comprise entre 385 et 475 nm pour durcir une composition comportant un oligomère ou un prépolymère réactif ainsi qu'un photoamorceur ayant un pic d'absorption pour la même longueur d'onde.
PCT/BE1996/000119 1995-11-09 1996-11-07 Procede de fabrication d'un article optique utilisant le rayonnement de lumiere visible WO1997017182A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU75576/96A AU7557696A (en) 1995-11-09 1996-11-07 Method for producing an optical article using visible light radiation

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US670195P 1995-11-09 1995-11-09
US60/006,701 1995-11-09
US73690896A 1996-10-25 1996-10-25
US08/736,908 1996-10-25

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Publication Number Publication Date
WO1997017182A1 true WO1997017182A1 (fr) 1997-05-15

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PCT/BE1996/000118 WO1997017181A1 (fr) 1995-11-09 1996-11-07 Procede de fabrication d'un article optique dans un moule scelle sous vide
PCT/BE1996/000119 WO1997017182A1 (fr) 1995-11-09 1996-11-07 Procede de fabrication d'un article optique utilisant le rayonnement de lumiere visible

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PCT/BE1996/000118 WO1997017181A1 (fr) 1995-11-09 1996-11-07 Procede de fabrication d'un article optique dans un moule scelle sous vide

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WO (2) WO1997017181A1 (fr)

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Publication number Priority date Publication date Assignee Title
ID24590A (id) * 1997-11-14 2000-07-27 Novartis Ag Metode dan komposisi untuk pembuatan lensa oftalmil berwarna

Citations (6)

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