Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Reexamination Certificate
2006-01-24
2009-11-03
Ahmed, Sheeba (Department: 1794)
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
C428S500000, C428S516000, C525S240000
Reexamination Certificate
active
07611776
ABSTRACT:
The present invention provides a propylene polymer composition for producing a biaxially oriented film, comprising propylene random copolymer and propylene homopolymer; wherein the propylene random copolymer is a copolymer of propylene and ethylene, optionally comprising one or more alpha-olefins of C4-C10; the propylene polymer composition has an overall isotacticity index, as determined by nuclear magnetic resonance method, of greater than or equal to 96.5%, and an ethylene content of greater than 0.3 wt %; and wherein, the melt flow rate of the propylene random copolymer is lower than that of the propylene homopolymer. The biaxially oriented polypropylene film produced by the propylene polymer composition of the present invention exhibits excellent physical properties, and has, in the absence of any stiffening agent, relatively higher modulus and stiffness. Moreover, the process for producing the biaxially oriented polypropylene film is featured with a good film-forming stability and a high film-forming stretching speed.
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Guo Meifang
Liu Rongmei
Ma Qingshan
Qiao Jinliang
Song Wenbo
Ahmed Sheeba
Beijing Research Institute of Chemical Industry China Petroleum
China Petrochemical & Chemical Corporation
Ladas and Parry LLP
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