Heat-curing reactive powders based on polyurethanes

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

C - Chemistry, Metallurgy

08

L

400/5515, 400/74

C08L 75/04 (2006.01) C08G 18/08 (2006.01) C08G 18/42 (2006.01) C08G 18/46 (2006.01) C08G 18/50 (2006.01) C08G 18/65 (2006.01) C08G 18/70 (2006.01) C08G 18/76 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01) C08L 39/06 (2006.01)

Patent

CA 2031224

Mo3495 LeA 27,353 HEAT-CURING REACTIVE POWDERS BASED ON POLYURETHANES ABSTRACT OF THE DISCLOSURE The present invention relates to the preparation of powdered heat-curable reaction mixtures in which melt suspensions of (a) solid polyisocyanates having melting points above about 60°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°C to 150°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 uncrosslinked form. The invention further relates to the use of the heat-curing reaction mixtures for the preparation of high-quality polyurethane polyurea plastics.

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