Butene-1 copolymer and resin composition containing the same
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsTadashi Asanuma, Tetsunosuke Shiomura, Tateyo Sasaki, Tutomu Iwatani, Nobutaka Uchikawa, Kouji Kitabayashi
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Abstract
Copolymers of butene-1 and propylene, having specific physical properties and substantially a syndiotactic structure; and easily heat-sealable polypropylene resin compositions comprising 5-50 parts by weight of one of the copolymers and 95-50 parts by weight of a stereoregular crystalline propylene-ethylene copolymer or propylene-ethylene-C.sub.4-12 -.alpha.-olefin copolymer having specific compositions and melt flow index.
Claims4
A copolymer of butene-1 and propylene, wherein, of an absorption of the side-chain methylene groups of butene-1 units of said copolymer as measured in the form of a 1,2,4-trichlorobenzene solution by .sup.13 C-NMR, the intensity of an absorption observed at about 26.9 ppm using tetramethylsilane as a standard is at least 0.3 of the intensity of a full absorption of the side-chain methylene groups observed at about 27.8-26.0 ppm using tetramethylsilane as a standard;
- the content of propylene units ranges from 0.1 wt.% to 20 wt.%;
- and the intrinsic viscosity as measured at 135.degree. C. in the form of a tetralin solution is at least 0.05.
Dependencies are inferred from the claim text.