Stable and high solids aqueous dispersions of blocked polyisocya

Details Stable and high solids aqueous dispersions of blocked polyisocya Stable and high solids aqueous dispersions of blocked polyisocya

1997-10-29

2000-08-01

Gorr, Rachel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524591, 524801, 528 45, 525417, 25218222, 523336, C08G 1880

Patent

active

060968052

ABSTRACT:
A stable and high-solids aqueous dispersion of blocked isocyanates, containing auxiliary solvent, is prepared by (1) preparing a solution of a polyisocyanate mixture of from 20-70% by weight of a blocked, hydrophilically modified polyisocyanate (A) and from 30-80% by weight of a blocked, hydrophobic polyisocyanate (B) in an auxiliary solvent (G) and (2) adding water to this solution, with intensive mixing, in an amount which is such as to give a two-phase system comprising a disperse polyisocyanate phase and a continuous, aqueous phase containing auxiliary solvent. In a preferred embodiment of the invention dispersions are prepared which are virtually free from auxiliary solvent, by first adding a portion of water to the solution (1), substantially removing the auxiliary solvent with intensive mixing and then adding a second portion of water with intensive mixing to the mixture comprising the polyisocyanates (A) and (B) and the first portion of water.

REFERENCES:
patent: 4098933 (1978-07-01), Burkhardt et al.
patent: 5202377 (1993-04-01), Thorne et al.
patent: 5508370 (1996-04-01), Reiff et al.

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