Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-05-15
1976-01-20
Welsh, M. J.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260 775AP, 293 60, C08L 2700
Patent
active
039339386
ABSTRACT:
A relatively inexpensive injection molding-grade thermoplastic polyurethane is based on a modified polyether diol. This elastomer has the inherent toughness, abrasion resistance and general good mechanical properties of the ether-based urethanes. Its temperature insensitivity and low temperature flexability are, however, exceptional. It is flexible to impact at -50.degree.F and stiff enough at 250.degree.F to allow painting without distortion.
The modified polyether polyol is a poly (oxypropylene) diol reacted with a 50/50 styrene/acrylonitrile monomer mixture using a free radical catalyst. This grafted polyol is preferably blended with a minor amount of a poly alkene ether diol and 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 one-fourth and three-eighth inch granules to give the molding composition.
REFERENCES:
patent: 3304273 (1967-02-01), Stamberger
patent: 3420796 (1969-01-01), Matsubayashi et al.
patent: 3652639 (1972-03-01), Pizzini et al.
patent: 3744835 (1973-07-01), Carbone et al.
Humphrey, Jr. William M.
Rhodes, Jr. Richard D.
McCord Corporation
Welsh M. J.
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