Soft, transparent and processable thermoplastic polyurethane
US6294638A · kind A · utility
5Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1999 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Oct 8, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/6674
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A soft, transparent and processable thermoplastic polyurethane resin suitable in optical application is disclosed. The resin is the product of reacting a diisocyanate, a chain extender, and a mixture of polyether polyols. The mixture of polyether polyols comprise (A) a C.sub.4 polyether polyol and (B) a C.sub.2 -C.sub.3 polyether polyol where the weight ratio A/B is in the range of about 85/15 to 15/85.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.