Process for the preparation of polyurethane powders

Details Process for the preparation of polyurethane powders Process for the preparation of polyurethane powders

1990-08-10

1991-10-29

Welsh, Maurice J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525131, C08L 7504

Patent

active

050617567

ABSTRACT:
The present invention is directed to an improved process for the direct preparation of polyurethane powders in a finely divided form by the reaction of polyisocyanates and isocyanate reactive compounds in a carrier phase, using interface active compounds, the improvement wherein the interface active compound used consists of at least one polymer of a urethane of (i) a long chain alkyl isocyanate and (ii) a hydroxyalkyl-acrylic or -metacrylic acid ester.

REFERENCES:
patent: 3787525 (1974-01-01), McGarr
patent: 3894994 (1975-07-01), Day et al.
patent: 3933759 (1976-01-01), Hoeschele
patent: 4000218 (1976-12-01), Critchfield et al.
patent: 4032516 (1977-06-01), McGarr
patent: 4107256 (1978-08-01), Conrad et al.
patent: 4873289 (1989-10-01), Lindner et al.

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