Derivatization of star-block copolymers
AssigneeAtlantic Richfield Company
InventorRalph Milkovich
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Abstract
Star-block copolymers having functional groups associated with the nucleus of the copolymers have been prepared. The copolymers of from 10-90% by weight of a monovinyl aromatic compound and 10-90% by weight of a conjugated diene have at least 3 arms connected to a polyvinyl aromatic nucleus and up to the same number of polar functional groups attached to said nucleus as there are arms attached thereto.
Claims51
Star-block copolymers of from 25 to 90% by weight of a monovinyl aromatic compound and 10 to 75% by weight of a conjugated diene of 4 to 8 carbon atoms;
- said copolymers having at least three arms connected to a polyvinyl aromatic compound nucleus and having polar functional groups attached to said nucleus.
In a process for preparing star-block copolymers by polymerizing monovinyl aromatic compounds and/or conjugated dienes in an inert hydrocarbon solvent with hydrocarbyllithium initiator and coupling the resulting block polymers or copolymer chains with polyvinyl aromatic compounds, the improvement comprising reacting the star-block copolymers, prior to terminaton of the living lithium sites, with a derivatization agent to form polar functional groups at the polyvinyl aromatic nucleus.
Dependencies are inferred from the claim text.