Process for producing low molecular weight, hydroxy...

Details Process for producing low molecular weight, hydroxy... Process for producing low molecular weight, hydroxy...

C - Chemistry, Metallurgy

07

C

400/111, 402/125

C07C 69/54 (2006.01) C08F 20/12 (2006.01) C08F 220/20 (2006.01) C08G 18/10 (2006.01) C08G 18/62 (2006.01)

Patent

CA 1297489

ABSTRACT Low molecular weight (meth)acrylate polymers with substantially .alpha.,.omega. -terminal hydroxyl groups with a hydroxyl group equivalent weight of 500 to 5000 are obtained by the polymerization of (meth)acrylates and optionally copolymerizable monomers in the presence of an initiator able to transfer hydroxyl groups to the polymer molecule and regulators of general formula HO-A-Sx-B-OH, in which A and B in each case stand for a divalent organic radical and x ? 2. By reacting with diisocyanates, the hydroxyfunctional (meth)acrylate polymers yield terminal isocyanate groups containing prepolymers, from which can be produced moisture-har- dening adhesives and sealants, which are preferably transparent.

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