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WO1995011789A1 - Procede d'extraction d'une lentille de contact de son moule - Google Patents

Procede d'extraction d'une lentille de contact de son moule Download PDF

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Publication number
WO1995011789A1
WO1995011789A1 PCT/US1994/012144 US9412144W WO9511789A1 WO 1995011789 A1 WO1995011789 A1 WO 1995011789A1 US 9412144 W US9412144 W US 9412144W WO 9511789 A1 WO9511789 A1 WO 9511789A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
contact lens
lens
isopropanol
release
Prior art date
Application number
PCT/US1994/012144
Other languages
English (en)
Inventor
Mahendra P. Nandu
Richard J. Wrue
Original Assignee
Bausch & Lomb Incorporated
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 Bausch & Lomb Incorporated filed Critical Bausch & Lomb Incorporated
Priority to AU80877/94A priority Critical patent/AU8087794A/en
Publication of WO1995011789A1 publication Critical patent/WO1995011789A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B29D11/00125—Auxiliary operations, e.g. removing oxygen from the mould, conveying moulds from a storage to the production line in an inert atmosphere
    • B29D11/00192—Demoulding, e.g. separating lenses from mould halves
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents

Definitions

  • This invention relates to improved methods of processing contact lenses, especially releasing a contact lens from the mold in which the lens was cast.
  • Soft contact lenses are produced by several methods including spincasting, static cast molding, and combinations of casting and lathing.
  • the lens In production methods using molds, the lens is generally retained on the mold following casting, and it is necessary to release the lens from the mold without damaging the lens.
  • One way to release lenses is to place the mold with the lens in water, usually at elevated temperature, wherein the lens is hydrated and released from the mold. This conventional method is discussed in U.S. Serial No. 07/755,201 (filed September 5, 1991) along with a modification wherein a surfactant is included in the hydration bath.
  • the invention provides a method of releasing a contact lens from a mold in which the contact lens was cast which comprises contacting the contact lens and the mold with a release solution comprising isopropanol, whereby the contact lens is released from the mold.
  • the invention provides a method comprising: casting a contact lens from a polymerizable mixture in a mold, wherein the contact lens is retained in the mold; releasing the contact lens from the mold by contacting the contact lens and the mold with a release solution comprising isopropanol; and subsequently hydrating the contact lens.
  • the methods provide release of lenses with good surface properties, clarity and image quality, and improved consistency in the quality of the lenses.
  • the release solution of this invention comprises isopropanol. Either pure isopropanol or an aqueous solution of isopropanol may be used. Preferably, the isopropanol content in the solution is at least 25 volume percent, with at least 40 volume percent being especially preferred.
  • the release solution may include other components if desired, such as the surfactants disc] sed in U.S. Serial No. 07/755,201 (filed
  • Suitable contact lenses include: "hard” lenses such as rigid gas permeable (RGP) contact lenses, formed of silicone acrylate or fluorosilicone acrylate copolymers; and "soft" hydrogel contact lenses. Preferred are the soft hydrogel contact lenses.
  • Lenses in this class are generally formed of a copolymer of at least one hydrophilic monomer and a crosslinking monomer.
  • Hydrophilic monomers include: unsaturated carboxylic acids, such as methacrylic acid and acrylic acid; (meth)acrylic substituted alcohols or glycols, such as 2-hydroxyethylmethacrylate, 2- hydroxyethylacrylate, glyceryl methacrylate, and polyethyleneglycol methacrylate; vinyl lactams, such as N-vinyl-2-pyrrolidone; and acrylamides, such as methacrylamide and N,N-dimethylacrylamide.
  • the crosslinking monomer is a material having multiple polymerizable functionalities, preferably vinyl functionalities.
  • crosslinking monomers include: divinylbenzene; allyl methacrylate; ethyleneglycol di(meth)aery] " * te, tetraethyleneglycol di(meth)acrylate, polyethyleneglycol di(meth)acrylate; and vinylcarbonate derivatives of the glycol di(meth)acrylates.
  • the copolymeric material further includes a ⁇ ilicone-containing monomer.
  • the method can be used for releasing lenses cast by various known methods. These casting methods include spincasting wherein the lens is retained in the spincast mold. Another method is static casting wherein the lens is cast between two mold parts. The release solution may be used to release the lens from both mold parts, however, it is preferred that the casting method results in the lens being selectively retained on one mold part wherein the release solution is used to release the lens from this mold part. A further method is spincasting an excess of monomer by spincasting in a spincasting mold and lathing the posterior surface while the lens is retained in the mold. Following the lathing operation, the lens is released from the mold with the release solution.
  • Contact lenses are released by contacting the lens and mold with the release solution, preferably by immersing the mold and lens assembly in the solution.
  • the release step may be accomplished at room temperature, although in some cases it may be advantageous to conduct the release at other temperatures, for example, at an elevated temperature up to about 125°C.
  • the lens is hydrated with water or buffered saline. Subsequently, the lens is sterilized such as by autoclaving in water or saline. These steps also effect removal of any residual isopropanol from the lens.
  • EXAMPLE Contact lenses were obtained as follows. Monomeric mixtures, containing 2-hydroxyethyl methacrylate and a crosslinking monomer, were cured by spincasting in polyvinyl chloride (PVC) molds, followed by lathing the posterior surfaces to obtain contact lenses. The lenses, still retained in the molds, were released by one of the following three conditions: (1) immersion in water at 50°C; (2) immersion in an isopropanol/water mixture (50/50 v/v) at ambient temperature; and (3) immersion in an isopropanol/water mixture (50/50 v/v) at 55°C.
  • PVC polyvinyl chloride
  • RI refractive index

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Eyeglasses (AREA)

Abstract

Procédé d'extraction d'une lentille de contact du moule dans lequel elle a été coulée et consistant à enduire ledit moule et la lentille de contact d'une solution de démoulage à base d'isopropanol.
PCT/US1994/012144 1993-10-28 1994-10-25 Procede d'extraction d'une lentille de contact de son moule WO1995011789A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80877/94A AU8087794A (en) 1993-10-28 1994-10-25 Method of releasing contact lenses from the mold

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14492393A 1993-10-28 1993-10-28
US08/144,923 1993-10-28

Publications (1)

Publication Number Publication Date
WO1995011789A1 true WO1995011789A1 (fr) 1995-05-04

Family

ID=22510771

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/012144 WO1995011789A1 (fr) 1993-10-28 1994-10-25 Procede d'extraction d'une lentille de contact de son moule

Country Status (2)

Country Link
AU (1) AU8087794A (fr)
WO (1) WO1995011789A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030559A1 (fr) * 1999-10-25 2001-05-03 Hydron Limited Procede de production de dispositifs ophtalmiques
WO2003082367A3 (fr) * 2002-03-28 2003-12-04 Bausch & Lomb Procede d'elimination de matieres extractibles se trouvant dans des dispositifs biomedicaux
WO2007075558A3 (fr) * 2005-12-29 2007-09-07 Johnson & Johnson Vision Care Procedes et systemes de liberation de lentilles optiques constituees d'hydrogel de silicone au moyen de tensioactifs
WO2007075760A3 (fr) * 2005-12-20 2007-09-07 Johnson & Johnson Vision Care Procedes et systemes de lixiviation et de liberation de lentilles optiques constituees d'hydrogel de silicone au moyen de solutions alcoolisees
EP1752166A3 (fr) * 2005-08-09 2007-10-03 CooperVision Inc. Procédé pour l'extraction/immersion des lentilles de contact et traitement des agents d'extraction
WO2008036795A1 (fr) * 2006-09-21 2008-03-27 Novartis Ag Procédé de démoulage de lentilles de contact
RU2389608C2 (ru) * 2005-12-20 2010-05-20 Джонсон Энд Джонсон Вижн Кэа, Инк. Способы и системы для выщелачивания и извлечения офтальмологических линз на основе силиконового гидрогеля спиртовыми растворами
US7811483B2 (en) 2006-06-01 2010-10-12 Coopervision International Holding Company, Lp Delensing of ophthalmic lenses using gas
EP1752280A3 (fr) * 2005-08-09 2010-11-17 CooperVision International Holding Company, LP Procédés de démoulage de lentilles et systèmes pour la fabrication de lentilles de contact content du silicone
US7968018B2 (en) 2007-04-18 2011-06-28 Coopervision International Holding Company, Lp Use of surfactants in extraction procedures for silicone hydrogel ophthalmic lenses
US8313675B2 (en) 2009-08-31 2012-11-20 Coopervision International Holding Company, Lp Demolding of ophthalmic lenses during the manufacture thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04212819A (ja) * 1990-10-16 1992-08-04 Seiko Epson Corp プラスチックレンズの製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04212819A (ja) * 1990-10-16 1992-08-04 Seiko Epson Corp プラスチックレンズの製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 9237, Derwent World Patents Index; AN 92-305328, "production of plastic moulding for lenses" *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030559A1 (fr) * 1999-10-25 2001-05-03 Hydron Limited Procede de production de dispositifs ophtalmiques
WO2003082367A3 (fr) * 2002-03-28 2003-12-04 Bausch & Lomb Procede d'elimination de matieres extractibles se trouvant dans des dispositifs biomedicaux
EP2345429A1 (fr) * 2005-08-09 2011-07-20 CooperVision International Holding Company, LP Procédé pour l'extraction/immersion des lentilles de contact et traitement des agents d'extraction
EP1752166A3 (fr) * 2005-08-09 2007-10-03 CooperVision Inc. Procédé pour l'extraction/immersion des lentilles de contact et traitement des agents d'extraction
US7319133B2 (en) 2005-08-09 2008-01-15 Coopervision, Inc. Contact lens extraction/hydration systems and methods of reprocessing fluids used therein
US9102110B2 (en) 2005-08-09 2015-08-11 Coopervision International Holding Company, Lp Systems and methods for removing lenses from lens molds
US7629436B2 (en) 2005-08-09 2009-12-08 CooperVision International Holding Compound, LP Contact lens extraction/hydration systems and methods of reprocessing fluids used therein
EP1752280A3 (fr) * 2005-08-09 2010-11-17 CooperVision International Holding Company, LP Procédés de démoulage de lentilles et systèmes pour la fabrication de lentilles de contact content du silicone
RU2389608C2 (ru) * 2005-12-20 2010-05-20 Джонсон Энд Джонсон Вижн Кэа, Инк. Способы и системы для выщелачивания и извлечения офтальмологических линз на основе силиконового гидрогеля спиртовыми растворами
WO2007075760A3 (fr) * 2005-12-20 2007-09-07 Johnson & Johnson Vision Care Procedes et systemes de lixiviation et de liberation de lentilles optiques constituees d'hydrogel de silicone au moyen de solutions alcoolisees
WO2007075558A3 (fr) * 2005-12-29 2007-09-07 Johnson & Johnson Vision Care Procedes et systemes de liberation de lentilles optiques constituees d'hydrogel de silicone au moyen de tensioactifs
US7811483B2 (en) 2006-06-01 2010-10-12 Coopervision International Holding Company, Lp Delensing of ophthalmic lenses using gas
US8197724B2 (en) 2006-06-01 2012-06-12 Coopervision International Holding Company, Lp Delensing of ophthalmic lenses using gas
WO2008036795A1 (fr) * 2006-09-21 2008-03-27 Novartis Ag Procédé de démoulage de lentilles de contact
US7968018B2 (en) 2007-04-18 2011-06-28 Coopervision International Holding Company, Lp Use of surfactants in extraction procedures for silicone hydrogel ophthalmic lenses
US8313675B2 (en) 2009-08-31 2012-11-20 Coopervision International Holding Company, Lp Demolding of ophthalmic lenses during the manufacture thereof

Also Published As

Publication number Publication date
AU8087794A (en) 1995-05-22

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