Molded plastic parts, particularly spin-cast plastic parts for e

Details Molded plastic parts, particularly spin-cast plastic parts for e Molded plastic parts, particularly spin-cast plastic parts for e

1978-10-27

1981-10-13

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264310, 264337, B29C 504

Patent

active

042947928

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.

REFERENCES:
patent: 3708567 (1973-01-01), Hampel
patent: 4002418 (1977-01-01), Wallace
patent: 4034955 (1977-07-01), Wallace
Rubber-Mold Spin-Casting, Tekcast Ind. Inc., In Machine Design, Jan. 1977, pp. 113-117.
Spencer, Centrifugal Casting of Thermoplastics, SPE Journal, Jul. 1962, pp. 774-779.

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