Polytetramethylene ether polyurethane-urea resins

Details Polytetramethylene ether polyurethane-urea resins Polytetramethylene ether polyurethane-urea resins

C - Chemistry, Metallurgy

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C08G 18/48 (2006.01) A61M 25/00 (2006.01) C08G 18/10 (2006.01) C08G 18/76 (2006.01) F16L 11/04 (2006.01)

Patent

CA 1052940

POLYTETRAMETHYLENE ETHER POLYURETHANE-UREA RESINS Abstract The novel thermoplastic polytetramethylene ether polyurethane-urea elastomers of this in- vention are prepared by reacting a tetramethylene ether glycol with 4,4'-diphenyl methane diisocyanate to form a polytetramethylene ether polyurethane pre-polymer having a number average molecular weight of from about 2,000 to about 10,000. This pre-polymer is water- extended to form a thermoplastic bio-compatible elastomer having a number average molecular weight of about 50,000 to about 100,000, and a weight average molecular weight of about 300,000 to about 1,000,000. The elastomer so obtained has a softening point in the range of 127°C.- 149°C. and may be melt extruded without decom- position to produce articles useful in the field of medicine and surgery.

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