Patent ID: 8202920

Claim:
A heat-curing epoxy resin composition comprising: at least one epoxy resin A having an average of more than one epoxide group per molecule; at least one hardener B for epoxy resins, where the at least one hardener is activated via an elevated temperature; at least one end-capped polyurethane prepolymer of the formula (I) wherein: R 1 is a linear or branched polyurethane prepolymer PU1 terminated by m+m′ isocyanate groups, after removal of all of the terminal isocyanate groups; n is 0 or 1, m is a value from 1 to 8 and m′ is a value from 0 to 7, wherein m+m′ is a value from 2 to 8; Y 1 , Y 2 , Y 3 and Y 4 , independently of the others, are H, halogen, NO 2 , alkyl, or alkoxy; and R 2 , independently of the others, is a substituent selected from the group consisting of: where R 5 , R 6 , R 7 and R 8 , independently of the others, is an alkyl or cycloalkyl or aryl or aralkyl or arylalkyl group, or R 5 together with R 6 , or R 7 together with R 8 , forms a portion of 4- to 7-membered ring which is optionally substituted; where R 9 , R 9′ , and R 10 , independently of the others, is an alkyl or aralkyl or aryl or arylalkyl group, or is an alkyloxy or aryloxy or aralkyloxy group; where R 11 is an alkyl group, where R 12 , R 13 , and R 14 , independently of the others, is an alkylene group having from 2 to 5 carbon atoms and, optionally, having double bonds or substitution, or is a phenylene group, or is a hydrogenated phenylene group; where R 15 , R 16 , and R 17 , independently of the others, is H, or is an alkyl group, or is an aryl group or an aralkyl group; and where R 18 is an aralkyl group or is a mono- or polynuclear substituted or unsubstituted aromatic group which, optionally, has aromatic hydroxy groups; or is a moiety of the formula where R 4 , independently of the others, is a moiety of an aliphatic, cycloaliphatic, aromatic, or araliphatic epoxide containing a primary or secondary hydroxy group, after the removal of the hydroxide and epoxide groups, and p is a value of 1, 2, or 3, and wherein the polyurethane prepolymer PU1 is produced from: at least one diisocyanate or triisocyanate, a polymer Q PM having terminal amino, thiol, or hydroxy groups, and a polyphenol Q PP which optionally is substituted.