Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
2007-08-28
2007-08-28
Chen, Vivian (Department: 1773)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C428S343000, C428S3550RA, C428S3550EN, C428S3550AC, C428S412000, C428S474700, C428S475200, C428S476300, C428S480000, C428S483000, C428S515000, C428S516000, C428S518000, C428S520000, C428S522000, C428S523000
Reexamination Certificate
active
10683827
ABSTRACT:
The present invention provides a multi-layer polymer composition having a polar outer layer and a non-polar second outer layer. The polar outer layer is preferably PVC and the non-polar outer layer, polypropylene. The adhesive tie layer is a unique blend of a copolyester elastomer, a non-polar polymer, and a copolymer that contains functional groups capable of reaction with the functional end groups of the copolyester elastomer and that is totally or partially miscible with the non-polar polymer in the second outer layer. The multi-layer polymer can be advantageously coextruded. The non-polar outer layer can comprise the bulk of a fabricated part, with only a thin layer of polar polymer, providing desired attributes of the polar polymer at a lower cost.
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Chen Vivian
E. I. du Pont de Nemours and Company
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