Grafted polyether diol-based thermoplastic urethane elastomer
US3933938A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1974 |
| Grant date | Jan 20, 1976 |
| Priority date | — |
| Expiry date | May 15, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.