Polyurethanes based on amino-acids or derivatives thereof
US3932359A · kind A · utility
3Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1973 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | Aug 29, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/277
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Amino acid-urethane copolymers improved in elongation, tensile strength and flexing endurance are prepared by polymerizing a prepolymer having terminal isocyanate groups, obtained by reacting a polyether polyol having hydroxyl groups substantially at the terminals thereof with an organic polyisocyanate in a ratio in equivalent of the organic polyisocyanate to the polyether polyol of 1.6 to 2.5, either with an amino acid-N-carboxylic acid anhydride or with a polyamino acid polymer obtained by polymerizing an amino acid-N-carboxylic acid anhydride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.