US 2009/0156777 A1 · Freeze-stable aromatic diisocyanates and processes for the preparation of these freeze-stable products

Abstract

This invention relates to freeze-stable aromatic diisocyanates, an to processes for the preparation of these freeze-stable aromatic diisocyanates. The preferred aromatic diisocyanate is preferably diphenylmethane diisocyanate. These freeze-stable aromatic diisocyanates comprise a blend of an aromatic diisocyanate, with 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, and have an NCO group content of from about 6% to about 29% by weight. Suitable aromatic diisocyanates contain one or more of the following modifying groups: allophanate groups, carbodiimide groups, uretonimine groups, biuret groups, dimer groups, isocyanurate groups, urea groups and/or urethane groups. Prepolymers of these modified aromatic diisocyanates are also suitable for the present invention.

Claims16

Dependent claims

A freeze-stable aromatic diisocyanate composition having an NCO group content of about 6 to about 29% by weight which comprises:

(I) from 60% to 95% by weight, based on 100% by weight of (I) and (II), of an aromatic diisocyanate which is modified to contain at least one of the following groups:
allophanate groups, carbodiimide groups, uretonimine groups, biuret groups, dimer groups, isocyanurate groups, urea groups and/or urethane groups, in which the modified diisocyanate has an NCO group content of from 15% to 30% by weight, or one or more prepolymers of said modified aromatic diisocyanates, in which said prepolymer has an NCO group content of from 10% to 28% by weight;
and
(II) from 5 to 40% by weight, based on 100% by weight of (I) and (II), of 2,2,4-trimethyl-1,3-pentanediol diisobutyrate.

1 more element

A process for the preparation of a freeze-stable aromatic diisocyanate composition having an NCO group content of about 6% to about 29% by weight, which comprises:

(1) blending
(I) from 60% to 95% by weight, based on 100% by weight of (I) and (II), of an aromatic diisocyanate which is modified to contain one or more of the following modifying groups:
allophanate groups, carbodiimide groups, uretonimine groups, biuret groups, dimer groups, isocyanurate groups, urea groups and/or urethane groups, in which the modified aromatic diisocyanate has an NCO group content of 15% to 30% by weight, or one or more prepolymers of said modified aromatic diisocyanates in which said prepolymer has an NCO group content of 10% to 28% by weight;
with
(II) from 5 to 40% by weight, based on 100% by weight of (I) and (II), of 2,2,4-trimethyl-1,3-pentanediol diisobutyrate.

2 more elements

Dependencies are inferred from the claim text.

Freeze-stable aromatic diisocyanates and processes for the preparation of these freeze-stable products

Life of this patent

Freeze-stable aromatic diisocyanates and processes for the preparation of these freeze-stable products

Life of this patent

Abstract

Claims16