Produits Chimiques Ugine Kuhlmann

Cdf Chimie S.a.

Michel Ochsenbein

Jean-Paul Ollivier

An anti-shrink additive for unsaturated polyester resins of the formula: ##STR1## wherein, R is the remainder of a triol or tetrol,

Anti-shrink additive for unsaturated polyester, its fabrication process,

This invention relates to an unsaturated polyester resin containing from about 1.5 .times.10.sup.-3 to 1.5.times.10.sup.-2 ether group per gram of resin and having a viscosity of from about 6 to 20 poise measured at 20.degree. C. on a 60% by weight solution thereof in styrene, comprising the condensation reaction product of at least one dibasic acid or corresponding anhydride, at least one of which is a polyol and at least one of which is a saturated linear ether alcohol containing at least one ether group; preimpregnated materials comprising said resin; and to the methods of making such resin.

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Creil, France

Michel Ochsenbein