Synthesis of ABA triblock polymers and A.sub.n B star polymers from cyclic ethers
US4952644A · kind A · utility
16Cited by
4References
4Claims
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Key dates
| Filing date | Jun 7, 1989 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Jun 7, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
ABA triblock and A.sub.n B star polymers are produced by sequential cationic polymerization of 4 and 5 member ring cyclic ethers to initially form a B block and subsequent cationic polymerization of 4 and 5 member ring cyclic ethers to form A blocks at the termini of the B block. The B block is grown from the hydroxyl groups of a polyol having two or more hydroxyl groups, resulting in a B block having terminal hydroxyl functionality of two or greater. In growing each of the B and A blocks, the acid catalyst is used at a molar ratio relative to hydroxyl groups of the polyol initiator of between about 0.05:1 and about 0.5:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.