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US 4,308,364 AGranted
Lactones from gamma-hydroxy acids as coupling agents
AssigneePhillips Petroleum Company
InventorKishore Udipi
Life of this patent
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Abstract
Lactones derived from gamma-hydroxy acids are employed as coupling agents for polymers derived from alkali metal-initiated polymerizations. These coupling agents provide effective coupling without formation of undesirable by-products.
Claims9
A process of coupling an alkali metal-terminated polymer derived from the solution polymerization of at least one conjugated diene, monovinylarene, or both, wherein the improvement comprises employing an effective amount of at least one lactone derived from an .gamma.-hydroxy acid in coupling said alkali-metal terminated polymer.
Dependencies are inferred from the claim text.