Compositions Exhibiting High ESCR and Comprising Monovinylidene Aromatic Polymers and Olefinic Copolymers Containing Unsaturation
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United States of America Patent
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Issued Date -
Aug 5, 2010
app pub date -
Jul 14, 2008
filing date -
Jul 17, 2007
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Abandoned
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Abstract
Compositions comprising (a) a monovinylidene aromatic polymer, e.g., HIPS, and (b) an ethylene/alpha-olefin (EAO) copolymer, e.g., an ethylene-propylene copolymer, that satisfies the mathematical relationship: y≦20+2.35x in which y is the ethylene content in mole percent (mol %) of the EAO copolymer and x is the Brookfield viscosity in centipoise (cP) at 10O° C. of the EAO copolymer and the viscosity is at least 1 centipoise (cP), exhibit improved environmental stress crack resistance as compared to compositions containing monovinyiidene aromatic polymers but without such an EAO copolymer. The compositions are useful in the manufacture of articles, e.g., refrigerator liners and food packaging, which come in contact with the oils contained in various food stuffs.
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