Urethane elastomers prepared from polyethers having a certain molecular weight distribution
US3963681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1974 |
| Grant date | Jun 15, 1976 |
| Priority date | — |
| Expiry date | Jun 27, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/4808
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyether urethane elastomer composition having improved mechanical properties has been prepared by using polyfunctional isocyanate, curing agent and polyether having active hydrogen terminal groups, wherein the weight average molecular weight of said polyether is within the range of 1,000 to less than 4,500 and the molecular weight distribution curve of said polyether has at least two peaks, at least one of which is located in the higher molecular weight region and at least another one of which is located in the lower molecular weight region than the rheological critical molecular weight of said polyether and wherein the equivalent ratio (d) of active hydrogen of a curing agent to the isocyanate group of said polyfunctional isocyanate is in the range of 0.9<d<1.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.