Process for the preparation of stable dispersions of polyisocyanate-polyaddition products in hydroxyl containing compounds
AssigneeBayer Aktiengesellschaft
InventorArtur Reischl
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Abstract
This invention relates to a process for the in situ preparation of stable dispersions of polyisocyanate-polyaddition products in hydroxyl containing compounds as dispersing agent by a process which comprises reacting (1) organic polyisocyanates with (2) compounds having primary and/or secondary amino groups and/or primary hydroxyl groups and/or ammonia, in (3) compounds having at least one hydroxyl group, wherein compounds (3) have secondary hydroxyl groups in cases when compounds (2) have primary hydroxyl groups and wherein the components are reacted in the presence of more than 4% by weight of water, based on the quantity of reaction mixture including water.
Claims14
A process for the in situ preparation of a stable dispersion of non-ionic polyisocyanate-polyaddition products in hydroxyl containing compounds as dispersing agent by a process which comprises reacting the following components;
- (1) at least one organic polyisocyanate with
- (2) at least one compound selected from the group consisting of compounds having a group selected from the group consisting of primary amino groups, second amino groups, primary hydroxyl groups, and ammonia in
- (3) an alcohol selected from the group consisting of an alcohol containing 2 to 8 primary hydroxyl groups, an alcohol containing 2 to 8 secondary hydroxyl groups, and mixtures thereof, wherein compounds (3) have secondary hydroxyl groups when compounds (2) have primary hydroxyl groups and wherein the components are reacted in the presence of more than 4% by weight of water, based on the quantity of reaction mixture including water.
Dependencies are inferred from the claim text.