C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/133, 154/107
C08G 18/65 (2006.01) B32B 7/12 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/42 (2006.01) C08G 18/44 (2006.01) C08G 18/83 (2006.01) C09J 5/00 (2006.01) C09J 175/04 (2006.01) C09J 175/06 (2006.01)
Patent
CA 2025525
Mo-3452 LeA 26,955 STORAGE STABLE POLYURETHANE ADHESIVES ABSTRACT OF THE DISCLOSURE The present invention is directed to a predominantly linear polyurethane adhesive which can be cross-linked by heat and is at least partially crystalline at room temperature, comprising: a) a polyurethane prepolymer which contains masked isocyanate groups and is at least partially crystalline, and is prepared by reacting: a1) at least one at least partially crystalline organic polyhydroxyl compound having a molecular weight above 400, being selected from the group consisting of polyesters and polycarbonates, and a2) a polyisocyanate component consisting of at least one organic polyisocyanate having a functionality of at least 2, a3) at least one monofunctional isocyanate blocking agent, and a4) optionally a polyhydroxyl compound having a hydroxyl functionality of at least 2 and a molecular weight below 500, in which the equivalent ratio of isocyanate groups of component a2) to the sum of isocyanate reactive groups of components a1) and a4) is kept in the range of from 1.1:1 to 3:1, and the equivalent ratio of the isocyanate groups resulting from the ratio of components a1) and a4) to a2) to the monofunctional blocking agents a3) is kept in the range of from 0.8:1 to 1.15:1, and b) at least one low molecular weight amine functional and/or hydroxyl functional chain lengthening or cross-linking agent having a molecular weight of from 32 to 500, and having a functionality of at least 2. Le A 26 955 - US
Meckel Walter
Munzmay Thomas
Stepanski Horst
Aktiengesellschaft Bayer
Swabey Ogilvy Renault
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