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US 4,230,836 AGranted
Chemically cross-linked poly(p-methylstyrene)
AssigneeMobil Oil Corporation
InventorPeter J. Canterino
Life of this patent
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Abstract
Polymers of p-methyl styrene can be cross-linked with chemical cross-linking agents, such as peroxides, to produce insoluble products. The methyl styrene used has a high content of the para-isomer. An important end use is for rigid food or beverage containers subjected to thermal conditions.
Claims3
A chemically cross-linked polymer of methyl ethenyl benzene derived from a polymerizable mixture of isomers of methyl ethenyl benzene consisting essentially of less than 10 percent by weight 1-methyl-3-ethenyl benzene, at least 90 percent by weight 1-methyl-4-ethenyl benzene, and 0 to 0.1 percent 1-methyl-2-ethenyl benzene.
Dependencies are inferred from the claim text.