Polymer blends and their application as viscosity index improvers
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United States of America Patent
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Jun 22, 2004
Grant Date -
Sep 18, 2003
app pub date -
Mar 15, 2002
filing date -
Mar 15, 2002
priority date (Note) -
Expired
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Abstract
The present invention relates to a polymer blend containing a high ethylene content ethylene-propylene copolymer and a lower ethylene content ethylene-propylene copolymer. The polymer blend of the present invention is useful for the preparation of viscosity index improvers with improved lower temperature properties relative to conventional viscosity index improvers.
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