Thermosetting preform having superior transparency and process f

Details Thermosetting preform having superior transparency and process f Thermosetting preform having superior transparency and process f

1985-11-25

1988-02-16

Schofer, Joseph L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264319, 264320, 264347, 526273, 5263184, 52631845, 5263185, 526937, C08F22400, B29C 3910

Patent

active

047253975

ABSTRACT:
This invention provides novel thermosetting preform having superior transparency which is composed of the resin produced by partially polymerizing the mixture of (A) 4 to 30 wt % of at least one vinyl monomer containing carboxyl group, (B) 4 to 96 wt % of at least one vinyl monomer containing glycidyl group, and (C) up to 92 wt % of at least one copolymerizable monomer, said preform being characterized in that the amount of unreacted monomer remaining therein is less than 20 wt % and the glass transition temperature range is 120.degree. C. or lower. This invention also provides a method of production of a highly transparent molded article with high productivity which is superior in heat resistance and in chemical resistance by heating and molding said preform.

REFERENCES:
patent: 2604463 (1952-07-01), Bilton et al.
patent: 4051194 (1977-09-01), Ishikawa et al.
patent: 4407895 (1983-10-01), Nakauchi et al.
Patents Abstracts of Japan, vol. 7, No. 285, (C-201), [1430], 20th Dec., 1983; & JP-A-58 164 607 (Toray K.K.) 29-09-1983.

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