C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/09 (2006.01) C08G 18/16 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01)
Patent
CA 2431395
An alcohol-blocked polyisocyanate based on hexamethylenediisocyanate (HDI), obtained by reacting a polyisocyanate (PIC) based on HDI the base resin containing iminooxadiazinedione groups, wherein the molar fraction of the iminooxadiazinedione groups, as a proportion of the total of iminooxadiazinedione groups and isocyanurate groups, is at least 20 mol%, with an alcohol of the general formula (I): ROH (I) in which: R represents an aliphatic, straight-chain or branched, optionally cyclic, optionally substituted by O-R1 or NR1 2, C1-C6 radical, and R1 represents a straight-chain or branched alkyl. The present HDI-PIC blocked with simple alcohols have a significantly improved crystallization resistance compared with known isocyanurate type HDI-PIC blocked with simple alcohols while retaining or even improving the other advantageous properties of the blocked HDI-PIC of the isocyanurate type.
L'invention concerne de nouveaux isocyanates bloqués à base d'HDI, leur production et leur utilisation.
Baumbach Beate
Fussel Christian
Richter Frank
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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