Molding-grade polyurethane

Details Molding-grade polyurethane Molding-grade polyurethane

1974-05-15

1976-01-20

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 775CR, 293 60, C08L 2700

Patent

active

039339378

ABSTRACT:
A relatively inexpensive injection molding-grade thermoplastic polyurethane is based on a modified polyether diol. This elastomer has improved toughness, abrasion resistance and good mechanical properties. Its temperature insensitivity and low temperature flexability are exceptional. It is flexible to impact at -50.degree.F and stiff enough at 250.degree.F to allow painting without distortion. Of special interest is the fact that this grafted PPG-based polymer is injection moldable and possesses properties adequate for exterior automobile trim components and the like.
The modified polyether polyol is a poly (oxypropylene) diol reacted with a 50/50 styrene/acrylonitrile monomer mixture using a free radical catalyst. While a one shot method of preparation can be used, the capped polyol is preferably reacted with an aromatic diisocyanate to form a prepolymer in a known manner. The prepolymer is thereafter reacted with a C.sub.2 to C.sub.6 alkane diol, pan cast, cured and aged, followed by grinding to give the molding composition.

REFERENCES:
patent: 3418354 (1968-12-01), Wheeler
patent: 3652639 (1972-03-01), Pizzini et al.
patent: 3823201 (1974-07-01), Pizzini et al.

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