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US 5,177,159 AGranted
Polyhydroxy esters containing carboxyl end groups and their use
AssigneeCiba-Geigy Corporation
InventorsBettina Steinmann, Wolfgang Seiz
Life of this patent
Estimating the term…
Abstract
Curable compositions of matter containing (a) an epoxy resin and (b) a polyhydroxy ester containing carboxyl end groups which is obtainable by reaction of a diepoxide with a dicarboxylic acid in the presence of a basic catalyst, the amounts of the diepoxide and dicarboxylic acid being chosen so that 1.04 to 1.4 carboxyl groups of the dicarboxylic acid are present per epoxide group of the diepoxide, are suitable for the production of crosslinked products, in particular as adhesives or for the production of flexible coatings.
Claims7
A curable composition of matter containing
- (a) an epoxy resin and
- (b) a soluble thermoplastic polyhydroxy ester containing carboxyl end groups, which is obtained by reaction of a diepoxide with a dicarboxylic acid being chosen so that 1.04 to 1.4 carboxyl groups of the dicarboxylic acid are present per epoxide group of the diepoxide, and wherein component (b) has a molecular weight M.sub.n of 1000 to 4000, an M.sub.w /M.sub.n of 3 to 8, a carboxyl group content of 0.3 to 2.5 equivalents/kg and a glass transition temperature in the range from -20.degree. to 50.degree. C. or a melting point in the range from 10.degree. to 80.degree. C.;
- in which the amounts of component (a) and (b) are chosen so that 0.15 to 1 carboxyl group of the polyester (b) is present per epoxide group of the epoxy resin (a).
Dependencies are inferred from the claim text.