Process for preparing isocyanate homopolymers containing uretdione groups
AssigneesWanhua Chemical (Ningbo) Co., Ltd., Wanhua Chemical Group Co., Ltd.
InventorLidong SUN
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Abstract
The present invention relates to a process for preparing isocyanate homopolymers containing uretdione groups, in which the phosphinoboron compound of formula (I) are used as catalysts to catalyze the homopolymerization reaction of raw isocyanates, thereby obtaining a solution of isocyanate homopolymers having uretdione groups, then separating the solution and thus obtaining the isocyanate homopolymers containing uretdione groups. The isocyanate homopolymers containing uretdione groups prepared by this process have a high amount of the uretdione groups, wherein the dependence of the amount on the conversion rate of raw isocyanates is significantly ameliorated, with low chromaticities.
Claims19
A process for preparing isocyanate homopolymers containing uretdione groups comprising:
- in the presence of catalysts, homopolymerizing the raw isocyanate monomers to prepare isocyanate homopolymers containing uretdione groups, wherein the catalysts are phosphinoboron compounds of the structure of formula (I):
- wherein R1, R2 and R3 are independently selected from linear or branched C1-C20 alkyl group, optionally substituted C3-C20 cycloalkyl group, optionally substituted C7-C15 aralkyl or optionally substituted C6-C12 aryl group.
Dependencies are inferred from the claim text.