Stable dispersions and their use in the preparation of polyurethane foams
AssigneeMiles Inc.
InventorMark A. Koshute
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Abstract
The present invention relates to an improved process for preparing foams comprising reacting polyisocyanates with an in situ produced stable low solids dispersion of polyureas and/or polyhydrazodicarbonamides in a hydroxyl-group-containing material as a dispersing agent by reacting: (a) organic polyisocyanates with (b) a member selected from the group consisting of (i) polyamines containing primary and/or secondary amino groups, (ii) hydrazines, (iii) hydrazides, or (iv) mixtures thereof, in (c) said hydroxyl-group-containing material.
Claims2
An improved process for preparing foams comprising reacting a polyisocyanate with a dispersion of polyurea and/or polyhydrazodicarbonamide in a hydroxyl-group containing material dispersing agent wherein the dispersion is prepared by reacting:
- (a) an organic polyisocyanate with
- (b) a member selected from the group consisting of (i) a polyamine containing primary and/or secondary amino groups, (ii) a hydrazine, (iii) a hydrazide, and (iv) a mixture thereof, in
- (c) a hydroxyl-group-containing material wherein the hydroxyl group is secondary in an instance when (b) contains a primary hydroxyl group;
- the improvement wherein said dispersion contains from 1 to 19% by weight of in situ formed low solids content.
Dependencies are inferred from the claim text.