GB1283653A - Process for the manufacture of crystalline elastomeric plastics products based on diepoxides and branched polyester-polycarboxylic acids - Google Patents

Abstract

1283653 Reaction products of diepoxides and polyesters CIBA-GEIGY AG 1 April 1970 [1 April 1969] 15526/70 Heading C3B Crystalline, elastomeric polyadducts are prepared by reacting, with warming, 1 equivalent of a diepoxide (I) with 0À7-1À3 equivalents of a carboxyl terminated polyester (II) having M.W. 1200-10,000 and which consists of 99-90 mol. per cent of units: [O(CH 2 ) 4 OCO(CH 2 ) 2 CO]. II are slightly branched, i.e. the remaining structural units are derived from trifunctional or polyfunctional starting materials. II may have the general formula X is the hydrocarbon radical of a y-hydric aliphatic or cycloaliphatic polyol or of a polyhydric phenol, y=3-6 and z indicates the number of structural units necessary to obtain a molecular weight of 1200-10,000. Alternatively II may have the general formula in which X<SP>1</SP> represents the hydrocarbon radical of a y-basic aliphatic, cycloaliphatic or aromatic polycarboxylic acid. Suitable I are diglycidyl ethers of diols or diphenols, diglycidyl esters of dicarboxylic acids or N-heterocyclic diglycidyl compounds which contain the group =NCO- at least once in the heterocyclic ring and in which both glycidyl groups are directly linked to endocyclic nitrogen atoms, e.g. 1,1<SP>1</SP>-methylene-bis- (3 - glycidyl - 5,5 - dimethylhydantoin) and N(1),N(3) - diglycidyl - 5,5 - dimethylhydantoin. Reaction may take place in the presence of a basic accelerator, e.g. a tertiary amine. Conventional fillers and extenders may be present. The compositions may additionally contain some non-polymeric dicarboxylic acid provided the equivalent ratio of epoxy groups to carboxyl groups is maintained.