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US 4,785,022 AGranted
Use of rubbery copolymers to decrease coffee leakage in foam cups
AssigneeArco Chemical Company
InventorsFred M. Sonnenberg, Dennis M. Hajnik
Life of this patent
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Abstract
Various rubber polymers and copolymers have been added as a coating to seed beads of vinyl aromatic polymers. Cups molded from these beads were coffee leak tested and generally exhibited enhanced retention of coffee.
Claims4
A method for enhancing the coffee retention of molded foam cups made from vinyl aromatic polymer particles which have been impregnated with a blowing agent which method comprises coating the vinyl aromatic polymer particles with a effective amount of a rubber selected from the group consisting of polybutene, polyisobutylene, isobutylene-butene copolymer and butene-ethylene copolymer.
Dependencies are inferred from the claim text.