Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1997-07-09
1999-12-07
Resan, Stevan A.
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
428515, 428 349, 428910, 525240, 5263481, 5263486, B32B 2732, C08L 2314
Patent
active
059980397
ABSTRACT:
Disclosed is a polypropylene composition comprising (A) polypropylene and (B) a specific propylene-1-butene random copolymer in a specific amount ratio. The propylene-1-butene random copolymer (B) is characterized in that: (1) the copolymer contains 50 to 95% by mol of constituent units from propylene and 50 to 5% by mol of constituent units from 1-butene, (2) the intrinsic viscosity, as measured in decahydronaphthalene at 135.degree. C., is in the range of 0.1 to 12 dl/g, (3) the molecular weight distribution (Mw/Mn), as determined measured by GPC, is not more than 3, and (4) the parameter B value indicating randomness of the copolymerized monomer sequence distribution is in the range of 1.0 to 1.5. Also disclosed is a polypropylene composite film comprising (I) a crystalline polypropylene layer and (II) a layer formed from the polypropylene composition, which is laminated on at least one surface of the crystalline polypropylene layer (I). The polypropylene composition is excellent in heat resistance and low-temperature heat-sealing properties as well as in flexibility and impact resistance. The polypropylene composite film is excellent in not only heat-sealing properties, particularly low-temperature heat-sealing properties, but also transparency, scratch resistance and blocking resistance.
REFERENCES:
patent: 4211852 (1980-07-01), Matsuda et al.
patent: 5331054 (1994-07-01), Fujita et al.
patent: 5336746 (1994-08-01), Tsutsui et al.
patent: 5677408 (1997-10-01), Ueda et al.
Database WPI, Derwent Publications Ltd., London, GB; AN 94-338421 & JP-A-06 263 935 (Mitsui Petrochem), Sep. 20, 1994 (Eng. Abstract).
Hashimoto Mikio
Kagami Mamoru
Sugi Masahiro
Tanaka Yasuo
Tanizaki Tatsuya
Mitsui Chemicals Inc.
Resan Stevan A.
Tarazano D. Lawrence
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