Blend of radial block copolymers having high impact strength
AssigneePhillips Petroleum Company
InventorLawrence M. Fodor
Life of this patent
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Abstract
Two or more separate radial block copolymers of a monovinyl-substituted aromatic compound and a conjugated diene each having a heterogeneity index (ratio of weight average to number average molecular weight) for the monovinyl-substituted aromatic block outside the range of about 2.8 to 3.5 are mixed to give a blend having a heterogeneity index for the monovinyl-substituted aromatic compound blocks within the range of about 2.8 to 3.5, said blend having a high impact strength.
Claims9
A composition comprising a blend of at least two separately prepared resinous radial block copolymers of a monovinyl-substituted aromatic compound and a conjugated diene, each of said copolymers having a heterogeneity index of polymerized monovinyl-substituted aromatic compound blocks outside the range of 2.8 to 3.5, said blend having a heterogeneity index of polymerized monovinyl-substituted aromatic compound blocks within the range of about 2.8 to 3.5.
A resinous composition comprising a blend of two resinous copolymers, each copolymer being separately prepared by the sequential addition of a monovinyl-substituted aromatic compound and an initiator, a conjugated diene, and a polyfunctional coupling agent having at least three functional groups per molecule, each of said copolymers having a heterogeneity index of polymerized monovinyl-substituted aromatic compound blocks outside the range of 2.8 to 3.5, said blend having a heterogeneity index of polymerized monovinyl-substituted aromatic compound blocks within the range of about 2.8 to 3.5.
Dependencies are inferred from the claim text.