Heat-curing reactive powders based on polyurethanes

Details Heat-curing reactive powders based on polyurethanes Heat-curing reactive powders based on polyurethanes

1990-11-30

1991-12-31

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...

2521822, 523201, 523205, 523207, 525902, 525936, 528 45, 528 76, 528 83, C08L 7508

Patent

active

050773399

ABSTRACT:
The present invention relates to the preparation of powdered heat-curable reaction mixtures in which melt suspension of (a) solid polyisocyanates having melting points above about 60.degree. C., (b) molten high molecular weight isocyanate-reactive compounds having molecular weights of from 400 to 10,000 that have melting or softening points of 50.degree. C. to 150.degree. C., and (c) optionally, solid or liquid low molecular weight chain-extending or crosslinking compounds having molecular weights of from 62 to 399, are added to an inert solvent containing an emulsifier, thereby forming powdered heat-curable reaction mixtures in which components (a), (b), and (c) remain in uncrossedlinked form. The invention further relates to the use of the heat-curing reaction mixtures for the preparation of high-quality polyurethane polyurea plastics.

REFERENCES:
patent: 3917741 (1975-11-01), McGarr
patent: 3933759 (1976-01-01), Hoeschele
patent: 4483974 (1984-11-01), Grogler
Becker "Emulsions, Theory and Practice" 2nd Ed. Pg. 233, 1977.
J. H. Schulmann, J. Leja Transactions of the Fraday Society, vol. 50 pg. 598, 1954.

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