Method of producing color stable thermoplastic polymethanes and products made thereby
US4297472A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1977 |
| Grant date | Oct 27, 1981 |
| Priority date | — |
| Expiry date | Aug 26, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/6629
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The instant invention is directed to a novel method for improving the color stability of thermoplastic polyurethanes and the polyurethanes produced thereby. The invention broadly consists of adding relatively small amounts of a specified hydroxyl group containing additive to the thermoplastic polyurethane reaction mixture. The additive may be added before, or during production of the thermoplastic polyurethane. In general the additive is defined as: PA1 (a) having a molecular weight of 400 or less, and PA1 (b) containing from 2 to 4 aliphatic hydroxyl groups, with at least 2 of the hydroxyl groups being vicinal, and with the vicinal hydroxyl groups being primary and/or secondary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.