Crosslinked polyurethane-polyurea powders, a process for their p

Details Crosslinked polyurethane-polyurea powders, a process for their p Crosslinked polyurethane-polyurea powders, a process for their p

1990-03-19

1991-06-04

Nielsen, Earl

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

Synthetic resins

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

528 59, 528 65, 528 66, 528 77, C08F28306

Patent

active

050215205

ABSTRACT:
The present invention relates to crosslinked polyurethane-polyurea powders which are prepared by a process which comprises dispersing NCO semiprepolymers in an aqueous medium, forming powders and isolating the powders from the aqueous medium, the NCO semiprepolymers having an NCO content of 10 to 20%, being liquid at room temperature and/or dissolved in isocyanate-inert, water-soluble solvents and based on the reaction product of

REFERENCES:
patent: 3868350 (1975-02-01), Reiff et al.
patent: 3870684 (1975-03-01), Witt et al.
patent: 3917741 (1975-11-01), McGarr
patent: 4032516 (1977-06-01), McGarr
patent: 4184990 (1980-01-01), Reischl et al.
patent: 4293679 (1981-10-01), Cogliano
patent: 4895883 (1990-01-01), Pedain et al.
patent: 4945149 (1990-07-01), Matsumoto et al.
Kunststoffe, Polyurethane Handbook 1984, correspond. eng. vs. pp. 26-27.
Houben-Weyl Methoden der Organischen Chemie, 4th Ed., vol. E20, 1987.

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