Extruder process for making thermoplastic polyurethanes
US6534617B1 · kind B1 · utility
28Cited by
13References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1999 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Nov 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of manufacturing a thermoplastic polyurethane having a tensile strength of greater than 20 MPa is described, the method using a co-rotating reaction extruder to react the following:(i) an isocyanate having two isocyanate groups per molecule;(ii) a polydiene diol having from 1.6 to about 2 terminal hydroxyl groups per molecule and a number average weight of at least 500 and less than 20,000; and(iii) one or more chain extenders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.