Patent ID: 6515125
Filing Date: 2003-02-04
Classification: C07D,C08G

Abstract:
A storage-stable, liquid, partially trimerized polyisocyanate having an NCO group content of 24 to 40% by weight, and comprising the partial trimerization product of:(A) from 20 to 88% by weight of toluene diisocyanate having an isomer distribution of: (1) from 60 to 100% by weight of the 2,4-isomer, and (2) from 0 to 40% by weight of the 2,6-isomer, with the sum of the %'s by weight of (A)(1) and (A)(2) totalling 100% by weight of (A); and (B) from 12 to 80% by weight of a polyisocyanate of the diphenylmethane series comprising from: (1) 0 to 50% by weight of higher functionality polyisocyanates of the diphenylmethane series, (2) 40 to 100% by weight of 4,4â€²-diphenylmethane diisocyanate, (3) 0 to 20% by weight of 2,4â€²-diphenylmethane diisocyanate, and (4) 0 to 6% by weight of 2,2â€²-diphenylmethane diisocyanate, with the sum of the %'s by weight of (B)(1), (B)(2), (B)(3) and (B)(4) totalling 100% by weight of (B); wherein the sum of the %'s by weight of (A) and (B) total 100% by weight.