Ethylene oxide/propylene oxide polyether polyols and polyurethanes made therefrom
US9156936B2 · kind B2 · utility
1Cited by
7References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 11, 2011 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Sep 8, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2110/0008
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Copolymers of propylene oxide and ethylene oxide have an inner block that contains from 65-90 weight percent oxyethylene units and from 10 to 35 weight percent oxypropylene units. This block has a molecular weight of from 150 to 350. The copolymer has an outer block which contains at least 95 weight % oxypropylene units and from 0 to 5% oxyethylene units. The equivalent weight of the copolymer is from 800 to 2000. The copolymers are useful in making polyurethane foams that have unexpectedly high tensile and/or tear strengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.