Moulding compositions including an unsaturated polyester
AssigneeSocieta' Italiana Resine S.I.R. S.p.A.
InventorsPiero Paparatto, Silvio Vargiu, Antonio Parodi, Beppino Passalenti
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Abstract
Molding composition comprising from 10 to 50 wt.% of the polycondensation product of an alkylene glycol or a mixture of the latter with up to 20 wt.% of 2,2'-bis(4-hydroxycyclohexyl)propane or a halogenated derivative thereof, with an ethylenically unsaturated dicarboxylic acid and a saturated dicaboxylic acid, having a melting point of at least 60.degree. C, an acid value of less than 50 and a Gardner viscosity from Y to Z.sub.3, from 0.2 to 2 wt.% of organic peroxide with a decomposition temperature above 70.degree. C, and an inert filler. The resulting molded articles are particularly useful in the electrical and electronic fields.
Claims15
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 polyol substance selected from the group consisting of alkylene glycols and mixtures of the latter with up to 20 wt.% of 2,2'-bis(4-hydroxycyclohexyl)propane in its unsubstituted or halogenated form, with an ethylenically unsaturated dicarboxylic acid and a saturated dicarboxylic acid, said polycondensation product having the following characteristics:
- melting point (at the capillary) .gtoreq.60.degree. C
- acid value (mg.KOH/g) <50
- Gardner viscosity (at 25.degree. C in 60 wt.% solution in styrene) from U to Z.sub.2 ;
- (b) from 0.2 to 2 wt.% of an organic peroxide having a decomposition temperature above 70.degree. C;
- (c) one or more inert fillers.
Dependencies are inferred from the claim text.