Star-branched polymers and functional fluids prepared therefrom
US5489649A · kind A · utility
1Cited by
1References
5Claims
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Assignee
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Key dates
| Filing date | May 16, 1994 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | May 16, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F297/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Novel star-branched polymers in which the arms are each a polymer of an anionically polymerizable monomer consisting of monoethylenically unsaturated compounds comprising p-tert-butylstyrene (t-BS) coupled with a polyalkenyl coupling agent. Certain of the foregoing star-branched polymers, e.g., wherein the arms are a homopolymer of t-BS and the coupling agent is divinylbenzene (DVB), are useful as additives to functional fluids, particularly hydrocarbon lubricating oils, for the purpose of improving their viscometric properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.