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US 5,397,841 AGranted
Grafted polymers having reactive groups at the base
AssigneeShell Oil Company
InventorsDonn A. DuBois, Robert J. Sutherland
Life of this patent
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Abstract
The present invention provides grafted polymers that have pendent functional groups on the core of the polymer wherein the core is a polymerized alkylmethacrylate having a number average molecular weight from 500 to 1,000,000. The arms of the grafted polymer comprise anionically polymerized segments that have number average molecular weights from 1,000 to 300,000.
Claims7
A process for making a graft polymer, comprising the steps of:
- anionically polymerizing styrene to form a first polymer having terminal reactive groups and a peak molecular weight from 1,000 to 300,000;
- and
- reacting the first polymer with a second polymer having pendent reactive groups and a peak molecular weight from 500 to 1,000,000, wherein the pendent reactive groups are reactive with the terminal reactive groups on the first polymer.
Dependencies are inferred from the claim text.