Crosslinkable thermoplastic polyurethane
US9650477B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2014 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Feb 6, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The TPU of this invention contains unsaturation in its polymeric backbone. The unsaturation can be present in the soft segment or in the hard segment or in both the soft and hard segments of the TPU. The TPU can be molded like a thermoplastic, and can be subsequently crosslinked by exposure to electron beam irradiation into thermoset articles having excellent chemical resistance, dimensional stability, set properties, heat resistance, oxidative resistance, and creep resistance. In one embodiment, the TPUs of this invention are the reaction product (1) a hydroxyl terminated intermediate, (2) a polyisocyanate, (3) a saturated glycol chain extender, and (4) a glycol chain extender containing carbon-carbon double bonds, such as the allyl moieties present in trimethylolpropane monoallyl ether. In another embodiment of this invention, the thermoplastic polyurethane which is crosslinkable by e-beam irradiation is comprised of the reaction product of (1) a saturated hydroxyl terminated intermediate, (2) an unsaturated hydroxyl terminated intermediate, wherein the unsaturated hydroxyl terminated intermediate contains carbon-carbon double bonds, (3) a polyisocyanate, and (4) a saturated glyc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.