WO1996030180B1 - Foamed rotationally molded articles - Google Patents
Foamed rotationally molded articlesInfo
- Publication number
- WO1996030180B1 WO1996030180B1 PCT/US1996/003478 US9603478W WO9630180B1 WO 1996030180 B1 WO1996030180 B1 WO 1996030180B1 US 9603478 W US9603478 W US 9603478W WO 9630180 B1 WO9630180 B1 WO 9630180B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thermoplastic
- range
- layer
- cells
- foamed
- Prior art date
Links
- 239000008188 pellet Substances 0.000 claims abstract 9
- 238000000034 method Methods 0.000 claims abstract 7
- 239000004604 Blowing Agent Substances 0.000 claims abstract 5
- 229920001169 thermoplastic Polymers 0.000 claims 28
- 239000004416 thermosoftening plastic Substances 0.000 claims 28
- -1 polyethylene Polymers 0.000 claims 22
- 239000004952 Polyamide Substances 0.000 claims 6
- 239000004743 Polypropylene Substances 0.000 claims 6
- 239000006260 foam Substances 0.000 claims 6
- 229920002647 polyamide Polymers 0.000 claims 6
- 229920000139 polyethylene terephthalate Polymers 0.000 claims 6
- 239000005020 polyethylene terephthalate Substances 0.000 claims 6
- 229920001155 polypropylene Polymers 0.000 claims 6
- 229920001707 polybutylene terephthalate Polymers 0.000 claims 5
- 239000004698 Polyethylene Substances 0.000 claims 4
- 229920000573 polyethylene Polymers 0.000 claims 4
- 239000000843 powder Substances 0.000 claims 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims 3
- 239000002245 particle Substances 0.000 claims 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims 3
- 239000004800 polyvinyl chloride Substances 0.000 claims 3
- 235000019399 azodicarbonamide Nutrition 0.000 claims 2
- 239000002666 chemical blowing agent Substances 0.000 claims 2
- ICGLPKIVTVWCFT-UHFFFAOYSA-N 4-methylbenzenesulfonohydrazide Chemical compound CC1=CC=C(S(=O)(=O)NN)C=C1 ICGLPKIVTVWCFT-UHFFFAOYSA-N 0.000 claims 1
- 239000004156 Azodicarbonamide Substances 0.000 claims 1
- VRFNYSYURHAPFL-UHFFFAOYSA-N [(4-methylphenyl)sulfonylamino]urea Chemical compound CC1=CC=C(S(=O)(=O)NNC(N)=O)C=C1 VRFNYSYURHAPFL-UHFFFAOYSA-N 0.000 claims 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 229920001903 high density polyethylene Polymers 0.000 claims 1
- 239000004700 high-density polyethylene Substances 0.000 claims 1
- 229920000092 linear low density polyethylene Polymers 0.000 claims 1
- 229920001179 medium density polyethylene Polymers 0.000 claims 1
- 239000004701 medium-density polyethylene Substances 0.000 claims 1
- 229920001748 polybutylene Polymers 0.000 claims 1
- 238000001175 rotational moulding Methods 0.000 claims 1
- 229920005992 thermoplastic resin Polymers 0.000 claims 1
- 238000009413 insulation Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
Abstract
Foamed rotationally molded articles and methods of manufacture are disclosed. The articles are prepared based upon inclusion of blowing agents in micro-pellets. The articles and the method for making them, display improved cell structure and uniformity leading to improved and generally uniform properties of the article, including for instance, insulation values and impact resistance.
Claims
1. A molded article comprising at least one foamed layer, said foamed layer having a density in the range of from 1 to 55 lb/ft3 (16 to 880 kg/m3); wherein said foamed layer includes a thermoplastic selected from the group consisting of polyethylene, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, and combinations thereof, preferably from the group consisting of low density polyethyelene, linear low density polyethylenes, medium density polyethylene, high density polyethylene and combinations thereof, wherein said foamed layer has a cell structure wherein at least 70% of said cells have a diameter in the range of from 400 to 800 μm, and wherein said foamed layer includes cells wherein a majority of said cells are closed cells.
2. The molded article of claim 1 including at least a second layer, said second layer having a density in the range of from 850 to 1400 kg/m3; wherein said second layer includes a thermoplastic selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyvinyl chloride and combinations thereof, wherein said thermoplastic in said foamed layer may be the same or different than said thermoplastic in said second layer.
3. A molded article comprising : a) at least a first layer, said first layer including a foamed thermoplastic, said foamed thermoplastic having a density in the range of from 16 to 880 kg/m3 where said foamed thermoplastic includes cells wherein a majority of said cells are closed cells; and b) at least a second layer, said second layer including a thermoplastic, said thermoplastic having a density in the range of from 850 to 970 kg m3.
4. In a process for producing a molded part comprising: a) charging a plurality of micro-pellets into a mold; b) rotating said mold on at least one axis; c) heating said micro-pellets to a temperature effective to produce a molded object characterized in that said molded object includes at least one layer of a thermoplastic foam having a majority of closed cells, said thermoplastic foam having a density in the range of from 16 to 640 kg/m3; wherein said micro-pellets have a volume equal to the volume of a sphere having a diameter in the range of from 250μm to 750μm; wherein said thermoplastic foam have cells wherein at least 70% of cells have an average size in the range of from 400 to 800 μm; and wherein said micro-pellets include at least one thermoplastic resin and a chemical blowing agent, preferably wherein: a) said thermoplastic is selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polyamide and combinations thereof; and b) wherein said molded part includes a second layer, wherein said second layer has a density in the range of from 850 to 1400 kg/m3, said second layer including a thermoplastic selected from the group consisting of polyethyene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polyamide, and combinations thereof, preferably wherein said process is a roto-molding process.
5. The process of claim 4 further comprising: charging a thermoplastic powder to said mold, wherein said powder has an average particle size in the range of from 200 μm to 300 μm.
6. The process of claim 4 wherein the thermoplastic of said thermoplastic powder and the thermoplastic of said thermoplastic foam may be the same or different, and thermoplastic of said thermoplastic powder or the thermoplastic of said thermoplastic foam is selected from the group consisting of polyethyene, 25
polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyamide, and combinations thereof.
7. A thermoplastic pellet comprising: a) a thermoplastic, preferably wherein said thermoplastic is selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthlate, polyamide, and combinations thereof; and b) a blowing agent; characterized in that said pellets have a particle size equivalent to the volume of a sphere having a diameter in the range of from 25 μm to 1500 μm, preferably wherein said particle size is in the range of from 300 μm to 1200 μm; and wherein said blowing agent is a chemical blowing agent said blowing agent being present in said pellet in the range of from 0.1 to 3 parts per hundred parts of said thermoplastic, preferably wherein said blowing agent is selected from the group consisting of: azodicarbonamide, modified azodicarbonamides, p-toluene sulfonyl semi carbazide, p,p'-oxybis(benzene)-sulfonyl hydrazide, p-toluene sulfonyl hydrazide.
8. Use of a plurality of thermoplastic pellets according to claim 7 to form a molded article.preferably a rotationally molded article, wherein said molded article contains at least one foamed layer having a density in the range of from 16 to 855 kg/m3, wherein said foamed layer has at least 70% of cells of said foam have an average size described by a diameter in the range of from 50 to 1300 μm, and wherein a majority of said cells are closed cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96911303A EP0817711A1 (en) | 1995-03-31 | 1996-03-15 | Foamed rotationally molded articles |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US41439595A | 1995-03-31 | 1995-03-31 | |
| US08/414,395 | 1995-03-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1996030180A1 WO1996030180A1 (en) | 1996-10-03 |
| WO1996030180B1 true WO1996030180B1 (en) | 1996-10-31 |
Family
ID=23641273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1996/003478 WO1996030180A1 (en) | 1995-03-31 | 1996-03-15 | Foamed rotationally molded articles |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0817711A1 (en) |
| CA (1) | CA2215253A1 (en) |
| WO (1) | WO1996030180A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6214272B1 (en) | 1998-07-14 | 2001-04-10 | Brunswick Corporation | Rotational molding process |
| GB9827432D0 (en) | 1998-12-11 | 1999-02-03 | Borealis As | Method |
| US6894109B1 (en) | 1998-12-11 | 2005-05-17 | Borealis Technology Oy | Method of producing pelletized polyolefin |
| GB2354732A (en) | 1999-09-28 | 2001-04-04 | Glance Tech Ltd | A cold storage container |
| EP1422059B1 (en) * | 2002-11-21 | 2012-04-25 | Total Petrochemicals Research Feluy | Multilayer rotational moulding |
| MXPA05010518A (en) | 2003-04-02 | 2005-11-16 | Phoenix Technologies Int | Method for preparing extremely small particles of recycled polyethylene terepathalate. |
| NO20042281L (en) * | 2004-06-02 | 2005-12-05 | Primo Norge As | Flow element as well as feed material for the manufacture of such |
| GB0414372D0 (en) * | 2004-06-26 | 2004-07-28 | Clarehill Plastics Ltd | Rotational moulding product and process |
| AR058107A1 (en) * | 2005-10-26 | 2008-01-23 | Phar H | MICRONIZED AZODICARBONAMIDE, ITS PREPARATION AND ITS USE |
| US8969435B2 (en) * | 2007-08-28 | 2015-03-03 | Gala Industries, Inc. | Method and apparatus for enhanced minimal shear molding utilizing extrusional, pelletization, and melt rheological control of pellets and micropellets and molded objects made therefrom |
| WO2014124358A1 (en) * | 2013-02-11 | 2014-08-14 | Invista Technologies S.A.R.L. | Micropelletized resin, manufacture and use thereof |
| WO2019018839A1 (en) | 2017-07-21 | 2019-01-24 | Zephyros, Inc. | Seal coated devices |
| EP3539742A1 (en) * | 2018-03-15 | 2019-09-18 | SABIC Global Technologies B.V. | Rotational molding of die extruded composites comprising a fibrillated flouropolymer |
| US12134213B2 (en) | 2018-03-22 | 2024-11-05 | Dow Global Technologies Llc | Process for forming a rotational molded article |
| CN112300497B (en) * | 2020-10-29 | 2023-04-07 | 中国石油化工股份有限公司 | Low-foam polypropylene composition for rotational molding process and preparation method thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3861404A (en) * | 1970-03-23 | 1975-01-21 | Monsanto Chemicals | Tobacco smoke filter |
| CA983226A (en) * | 1972-05-11 | 1976-02-10 | Du Pont Of Canada Limited | Rotational moulding of articles with foamed inner layer |
| JPS60137684A (en) * | 1983-12-26 | 1985-07-22 | Dainippon Printing Co Ltd | Production of decorative sheet having three-dimensional pattern |
| CA1280572C (en) * | 1984-05-01 | 1991-02-26 | Llewellyn A. Gilman, Jr. | Rotational molding method and boat hull |
| JPS62181343A (en) * | 1986-02-06 | 1987-08-08 | Kishimoto Akira | Sealant composition for lid of can |
| GB2193594A (en) * | 1986-08-08 | 1988-02-10 | Stc Plc | Water blocking in cables |
| KR960000727B1 (en) * | 1988-03-01 | 1996-01-12 | 도레이 가부시끼가이샤 | Manufacturing method of molded laminate |
| JPH03292378A (en) * | 1990-04-10 | 1991-12-24 | Nitto Denko Corp | Microcapsule, adhesive composition using same, and curing method therefor |
| JPH06342223A (en) * | 1993-06-01 | 1994-12-13 | Toyo Kasei Kogyo Co Ltd | Novel nonvolatile thermosensitive microencapsulated toner |
| GB9401214D0 (en) * | 1994-01-22 | 1994-03-16 | Univ Belfast | A method of rotational moulding and rotationally moulded products |
-
1996
- 1996-03-15 CA CA002215253A patent/CA2215253A1/en not_active Abandoned
- 1996-03-15 WO PCT/US1996/003478 patent/WO1996030180A1/en not_active Application Discontinuation
- 1996-03-15 EP EP96911303A patent/EP0817711A1/en not_active Withdrawn
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