C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/131
C08G 18/79 (2006.01) C08G 18/10 (2006.01) C08G 18/42 (2006.01) C08G 18/44 (2006.01) C08G 18/66 (2006.01) C09D 175/04 (2006.01)
Patent
CA 1334230
The invention is directed to a process for the preparation of prepolymers containing free isocyanate groups and having an isocyanate content of 1 to 16% by weight by the reaction of a) a polyisocyanate component with b) a polyhydroxyl component based on (i) at least one polyester polyol having a hydroxyl functionality (average) of about 1.8 to 5 and a hydroxyl number (average) of from 15 to 300 or (ii) mixtures of polyester polyols of the type mentioned under (i) with up to about 10% by weight, based on the weight of the mixture, of (cyclo)alkane polyols having a hydroxyl number above about 300 and optionally containing ester groups at an NCO/OH equivalent ratio above 2:1, characterized in that the compounds used as component (a) contain triisocyanato-isocyanurates having aliphatically or cycloaliphatically bound isocyanate groups. The present invention also relates to the prepolymers with free isocyanate groups obtainable by this process and their use as binders for moisture hardening one-component lacquers.
539357
K"onig Klaus
Pedain Josef
Sonntag Michael
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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