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US 5,478,899 AGranted
Alkoxy silyl capping agents for making terminally functionalized polymers
AssigneeShell Oil Company
InventorRobert C. Bening
Life of this patent
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Abstract
The capping of anionic polymers to make functionalized polymers is improved by using alkoxy silyl compounds having protected functional groups, such as acetal groups, as the capping agent. The protected functional groups are stable under a variety of conditions and then readily convert to more reactive terminal functional groups useful for making adhesives, sealants and coatings.
Claims9
A process for making functionalized polymers, comprising the steps of:
- anionically polymerizing an unsaturated monomer with a mono-lithium or di-lithium initiator;
- and
- terminating the polymerizing step by addition of an alkoxy silyl compound having the structure:
- ##STR5## wherein Y is an acetal group, a t-butyl dimethylsilyl group, or a trimethylsilyl ether group, and Z is a phenoxy radical or a trifluoroethoxy radical.
1 more element
A process for making functionalized polymers, comprising the steps of:
- anionically polymerizing 1,3-butadiene with a monolithium or di-lithium initiator;
- and
- terminating the polymerizing step by addition of an alkoxy silyl acetal compound having the structure:
- ##STR6## wherein Z' is a phenoxy radical or a trifluorethoxy radical.
1 more element
Dependencies are inferred from the claim text.