US 4,290,938 A · Thermosetting injection molding compound

Abstract

A thermosetting injection molding compound comprising a specific crystalline unsaturated polyester comprising (A) a crystalline unsaturated polyester of terephthalic acid/fumaric acid=5/5-1/9 by mol (acid component) and 1,4-butanediol/other glycol=7/3-10/0 (glycol component) and (B) a styrene type monomer and/or allyl type monomer, and having specific ranges of a viscosity, a melting point and an acid value, said crystalline unsaturated polyester resin being admixed with (C) a glass fiber and (D) other additives in a specific ratio. The thermosetting injection molding compound has no tackiness and has excellent flowability and mold filling properties and can give an excellent molded product having good appearance without flow marks, surge or the like, and hence, the thermosetting injection molding compound of the present invention is particularly suitable for the preparation of electric, electronic and automobile parts which require excellent heat resistance, electrical characteristics and fire retardant properties.

Claims8

Dependent claims

A thermosetting injection molding compound which comprises

(A) crystalline unsaturated polyester which comprises (A) a crystalline unsaturated polyester consisting of acid components:
terephthalic acid/fumaric acid=5/5 to 1/9 by mol and glycol components:
1,4-butanediol/other glycol=7/3 to 10/0 by mol, and having a Gardner-holdt bubble viscosity of N to W (measured in a 70% by weight solution in tetrachloroethane at 25.degree. C.), a melting point of 50.degree. to 130.degree. C. and an acid value of not more than 20, and (B) at least one monomer selected from the group consisting of a styrene type monomer and an allyl type monomer;
(C) a glass fiber;
and
(D) an additive selected from the group consisting of a filling agent, a fire retardant agent, a releasing agent, a colorant, a polymerization initiator and a polymerization inhibitor;
said components being incorporated in the ratios of B/(A+B)=5 to 40% by weight, C(A+B+C+D)=5 to 30% by weight, and (C+D)/(A+B)=90/10 to 40/60 by weight;
and said molding compound having an extension in a disc flow test of 80 to 110 mm.

5 more elements

Dependencies are inferred from the claim text.

Thermosetting injection molding compound

Life of this patent

Thermosetting injection molding compound

Life of this patent

Abstract

Claims8