The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1976
Filed:
May. 15, 1974
Richard D Rhodes, Jr, Somersworth, NH (US);
William M Humphrey, Jr, Dover, NH (US);
McCord Corporation, Detroit, MI (US);
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.