Title:
PRODUCTION OF OLIGOMER POLYISOCYANATE AND ITS USE
Document Type and Number:
Japanese Patent JP3157285
Kind Code:
B2
Abstract:
PURPOSE: To provide a novel process for oligomerization (i.e., dimerization and/or trimerization) of org. polyisocyanates (more preferalby diisocyanates) capable of exactly terminating reaction at a desired conversion rate by using catalysts.
CONSTITUTION: (a) A portion of the isocyanate groups of the org. polyisocyanates is oligomerized in the presence of the catalysts that accelerate the dimerization of the isocyanate groups and (b) the oligomerization reaction is terminated after reaction of about 5 to about 45% of the isocyanate groups present in said org. polyiscyanates by the addition of a catalyst poison comprising a silylated acid corresponding to the formula X-[Si(CH3)3]n [X is the neutral acid residue obtd. by removal of the acidic hydrogen atoms from an n-basic acid having a pKa value of at most 3, other than a hydrohalic acid and (n) is an integer of 1 to 3]. Further, the oligomeric polyisocyanates obtd. by this process, optionally in admixture with uncreacted starting polyisocyanate and/or optionally with the isocyanate groups blocked by blocking agents, as polyisocyanate component for the prepn. of polyurethane resin by the isocyanate polyaddition process is used.
Inventors:
Hans-Joachim Schior
Application Number:
JP17780792A
Publication Date:
April 16, 2001
Filing Date:
June 12, 1992
Export Citation:
Assignee:
Bayer Actien Gezershyaft
International Classes:
C07C269/02; C07C269/08; C07C271/20; C07D229/00; C08G18/02; C07D251/34; C08G18/78; C08G18/79; (IPC1-7): C07D229/00; C07D251/34
Domestic Patent References:
| JP6176467A | ||||
| JP26520A | ||||
| JP211554A |
Attorney, Agent or Firm:
Kazuho Kawarada