C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 71/04 (2006.01) C08G 18/44 (2006.01) C08G 18/64 (2006.01) C08G 64/42 (2006.01) C09D 169/00 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2204837
The present invention relates to a process for preparing hydroxy-functional polyurethane carbonates by reacting a) a dihydroxy- or higher hydroxy-functional polymer having a number average molecular weight of 500 to 100,000 and containing aliphatic carbonate groups and optionally ester groups with b) compounds containing at least one primary or secondary amino group and at least one hydroxy group to form urethane groups, wherein components a) and b) are present in amounts which correspond to a molar ratio of carbonate and ester groups of component a) to primary and secondary amino groups of component b) of greater than 1:1 to 20:1. The present invention also relates to the hydroxy-functional polyurethane carbonates obtained by this process and to their use as a binder component in polyurethane compositions, especially coating compositions.
Méthode pour préparer des polyurethane-carbonates hydroxylés par réaction a) d'un polymère dihydroxylé ou plus, ayant une masse moléculaire moyenne de 500 à 100000 et renfermant des groupes carbonates aliphatiques et, facultativement, des groupes esters, avec b) des composés contenant au moins un groupe amino primaire ou secondaire et au moins un groupe hydroxy pour former les groupes uréthanes, où les constituant a) et b) sont présents en quantités correspondant à un rapport molaire des groupes carbonates et esters du constituant a) au groupes amino primaires et secondaires du constituant b) de 1:1 à 20:1. La présente invention porte également sur les polyuréthanes-carbonates hydroxylés obtenus par ce procédé et sur leur emploi comme liants dans les compositions de polyuréthane, notamment les compositions de revêtement.
Hovestadt Wieland
Melchiors Martin
Scholl Hans-Joachim
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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