Patent ID: 8500948

Claim:
A method of bonding sterilizable composite films, comprising providing a component A made up of NCO-group-containing prepolymers, manufactured from at least one polyether alcohol, polyester alcohol, and/or polyalkylene alcohol having a functionality of 2 or 3 and having a molecular weight (M N ) below 2000 g/mol, reacted with a molar excess of TDI and with removal of the unreacted monomeric TDI; providing a component B containing at least one nonpolar, 2- or 3-functional polyester polyol, manufactured from di- and/or trivalent polyether polyols or polyalkylene polyols reacted with dicarboxylic acids or derivatives thereof, such that at least 10 to 50 mol% aliphatic C 8 to C 20 dicarboxylic acids must be contained, wherein component B contains less than 15 wt% 4 to 6 functional polyols and wherein at least one of component A or component B further comprises adjuvants and additives; mixing component A and component B to form a laminating adhesive; applying the laminating adhesive to a surface of a first film; applying a second film over the applied laminating adhesive; and curing the adhesive to form the bonded, sterilizable composite film.