Patent ID: 8123899

Claim:
A method of permanently bonding extensive substrates with improved heat stability of the bonded substrates, wherein said extensive substrates are polymer films bonded to moldings, said method comprising: adhesively bonding a plurality said polymer films to said moldings with an aqueous adhesive, said aqueous adhesive consisting essentially of a polyurethane and a silane wherein the silane is selected from the group consisting of 3-glycidyloxypropyltrimethoxysilane and 3-glycidoxypropyltriethoxysilane, and said silane is present in said adhesive in an amount ranging from 5 to 30 parts by weight of the silane per 100 parts by weight of polyurethane, wherein the polyurethane comprises anionic carboxylate groups and is synthesized from at least 60% by weight of diisocyanates and polyesterdiols, said polyesterdiols are produced by reacting dihydric alcohols of the general formula HO—(CH 2 ) x —OH, where x is a number from 1 to 20 with dibasic carboxylic acids of the general formula HOOC—(CH 2 ) y —COOH, where y is a number from 1 to 20.