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 Title: |
US4294792:
Molded plastic parts, particularly spin-cast plastic parts for eyeglass frames
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Arons, Irving J.; Peabody, MA
Merrill, Richard E.; Wakefield, MA
Drennan, Arthur P.; Brighton, MA
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| Assignee: |
Universal Optical Company, Inc., Providence, RI
other patents from UNIVERSAL OPTICAL COMPANY, INC. (598505) (approx. 2)
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| Published / Filed: |
1981-10-13
/ 1978-10-27
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| Application Number: |
US1978000955149
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| IPC Code: |
Advanced:
B29C 31/00;
B29C 33/40;
B29C 39/00;
B29C 39/08;
B29C 39/24;
B29C 39/26;
B29C 41/00;
B29C 41/04;
B29C 41/34;
B29C 41/40;
B29C 61/00;
B29C 70/68;
B29D 12/02;
IPC-7:
B29C 5/04;
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| ECLA Code: |
B29C33/40B; B29C39/00B2; B29C39/08; B29C70/68; B29D12/02; L29K63/00; L29L12/00B;
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| U.S. Class: |
Current:
264/311;
264/310;
264/337;
Original:
264/311;
264/310;
264/337;
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| Field of Search: |
264/310,311,337
425/DIG. 44
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| Priority Number: |
| 1978-10-27 |
US1978000955149 |
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| Abstract: |
Disclosed are molded plastic parts particularly eyeglass frame components, the centrifugal spin-casting of such parts and mold apparatus for producing such parts. Also disclosed are flexible molds for spin-casting eyeglass fronts and temples. In accordance with one aspect of the invention, the plastic parts are made from a resin system or mixture in liquid form comprising an epoxy resin, a curing agent therefore and an ultra-violet absorber and/or an antioxidant. DGEBA-type epoxy resins and polyoxypropylenediamine curing agents are the disclosed preferred epoxy resin and curing agent.
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| Attorney, Agent or Firm: |
Kenyon & Kenyon ;
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| Primary / Asst. Examiners: |
Derrington, James H.;
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 8 known family members
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First Claim:
Show all 13 claims |
What is claimed is:
1. A spin casting process for producing a solid, substantially clear, low color thermoset plastic part which has a cross-linked structure when cured, particularly an eyeglass part, in a flexible mold from a curable liquid resin system, the flexible mold including separable mold portions at least one of which is flexible and which define at least one mold cavity when the mold portions are assembled to form the flexible mold, means being provided for rigidly holding the mold portions together as a rigid, transportable mold assembly, said process comprising the steps of:
assembling the mold portions to form the flexible mold;
introducing the liquid resin system comprising an epoxy resin and a curing agent therefor which are substantially clear and of low color into the flexible mold;
rotating the flexible mold in the rigid mold assembly in or on spinning apparatus until the liquid resin system is distributed in the mold cavity but is still soft and uncured and is yet not self-supporting;
removing the rigid mold assembly including the flexible mold as a rigid unit from the spinning apparatus while the liquid resin system therein is still soft and uncured and is yet not self-supporting;
hardening the liquid resin system while in the rigid mold assembly after removal of the rigid mold assembly from the spinning apparatus to form the part; and
thereafter disassembling the rigid mold assembly and removing the part.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
Show drawing descriptions
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| Description: |
Show description
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| Forward References: |
Show 16 U.S. patent(s) that reference this one
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