Moulding compositions including an unsaturated polyester
AssigneeSocieta' Italiana Resine S.I.R. S.p.A.
InventorsSilvio Vargiu, Piero Paparatto, Beppino Passalenti, Antonio Parodi
Life of this patent
Estimating the term…
Abstract
Molding composition comprising from 10 to 50 wt.% of the polycondensation product of 2,2'-bis(4-hydroxycyclohexyl) propane or a halogenated derivative thereof, and maleic or fumaric acid, having a melting point above 70.degree. C, an acid value of less than 50 and a Gardener viscosity from Y to Z.sub.3, from 0.2 to 2 wt.% of an organic peroxide which decomposes at a temperature above 70.degree. C, and an inert filler. The resulting molded articles are particularly useful in the electrical and electronic fields.
Claims10
A granular molding composition suitable for injection molding comprising:
- a. from 10 to 50% by weight of an unsaturated polyester consisting of the polycondensation product of a polyhydroxy alcohol selected from the group consisting of 2,2'-bis(4-hydroxycyclohexyl) propane and its halogenated derivatives, and an ethylenically unsaturated dicarboxylic acid selected from the group consisting of maleic and fumaric acids, having the following characteristics:
- -- melting point (at the capillary) >
- 70.degree. C
- -- acid value (mg KOH/g) <
- 50
- -- Gardner viscosity (at 25.degree. C in 60 wt.% solution in styrene):
- from Y to Z.sub.3
- b. from 0.2 to 2% by weight of an organic peroxide which decomposes at a temperature above 70.degree. C;
- c. one or more inert fillers.
Dependencies are inferred from the claim text.