Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Noninterengaged fiber-containing paper-free web or sheet...
Patent
1980-08-06
1982-04-27
Derrington, James H.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Noninterengaged fiber-containing paper-free web or sheet...
264109, 264128, 523527, C08K 714
Patent
active
043271456
ABSTRACT:
A process for producing an easily handleable sheet molding compound which comprises impregnating glass fibers with a resin composition comprising (A) an unsaturated polyester having a hydroxyl value of 20 to 55 and an acid value of 5 to 20 with a hydroxyl value/acid value ratio of from 1.7 to 10, (B) a polymerizable monomer and (C) a polyisocyanate compound having not more than 20 carbon atoms excepting the carbon atoms of the isocyanate groups and selected from the group consisting of diisocyanates and polymethylenepolyphenyl isocyanates, the proportions of the unsaturated polyester (A) and the polyisocyanate compound (C) being such that the mole ratio of the hydroxyl groups of the unsaturated polyester (A) to the isocyanate groups of the polyisocyanate compound (C) is from 0.7 to 1.3, and said composition being free from an oxide or hydroxide of magnesium or calcium, said impregnation being effected so that the glass fiber content becomes 40 to 75% by weight; and molding the resin-impregnated glass fibers into a sheet.
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patent: 3886229 (1975-05-01), Hutchinson et al.
patent: 3933728 (1976-01-01), Henbest
patent: 4062826 (1977-12-01), Hutchinson et al.
patent: 4067845 (1978-01-01), Epel et al.
Hiraishi Shunichi
Mitani Tomomasa
Ogasawara Yoshimi
Dainippon Inc. & Chemicals Inc.
Derrington James H.
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