Light stable aliphatic thermoplastic urethane elastomers and method of making same
US5824738A · kind A · utility
27Cited by
3References
26Claims
0Family size
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Key dates
| Filing date | Oct 7, 1994 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Oct 7, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2140/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved light stable polyether/polyol based aliphatic urethane thermoplastic elastomer prepared from reacting inter alia a polyol having low terminal end unsaturation and an organic diisocyanate. The elastomer is characterized by ultraviolet stabilizer being present in a range of 0.25% to 2.0% at a total concentration of 1.0% to 2.0%, an antioxidant being present at a total concentration of 0.10% to 1.0%, and colorants/pigment being present in a total concentration in a range from 1.0% to 2.05% to produce an elastomer capable of withstanding Xenon arc artificial weathering with DE.ltoreq.3.00 after 2450 kilojoules of exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.