Mitsui Petrochemical Industries, Ltd.

Shell Oil Comapny

Kunisuke Fukui

Norio Kashiwa

Masaki Kohyama

Takeshi Muranaka

Masanori Motooka

Kazuyuki Takimoto

Ikuo Hirai

A highly crystalline semi-rigid random 1-butene/ethylene copolymer consisting of 1-butene and ethylene, said copolymer having the following characteristics (A) to (K);

Random 1-butene/ethylene copolymer

Disclosed herein are (1) a film of a liquid crystalline wholly aromatic polyester which is non-oriented and transparent, which film can be prepared by dissolving a liquid crystalline wholly aromatic polyester in a solvent, casting the resulting solution to form a film and volatirizing the solvent from the film as cast and (2) a film of a liquid crystalline wholly aromatic polyester which is oriented and polarizing, which film can be prepared by orienting the above-mentioned non-oriented film by drawing or heating.

Films of wholly aromatic polyester and processes for preparation thereof

A random 1-butene copolymer comprising 1-butene and an alpha-olefin having 5 to 20 carbon atoms, said copolymer having the following characteristics (A) to (I):

Random 1-butene copolymer

A random 1-butene/ethylene copolymer comprising 1-butene and ethylene, said copolymer having the following characteristics (A) to (I):

A melt-moldable wholly aromatic polyester comprising (A) aromatic hydroxycarboxylic acid residues, (B) aromatic diol residues, (C) 4,4'-dihydroxydiphenyl ether residues represented by the following formula ##STR1## and (D) aromatic dicarboxylic acid residues, and a melt-moldable wholly aromatic polyester comprising (A) aromatic hydroxycarboxylic acid residues, (C)' aromatic diol residues represented by the following formula

Melt-moldable wholly aromatic polyester

A crystalline random propylene copolymer composition comprising (i) a crystalline random propylene copolymer comprising 99 to 85 mole % of propylene and 1 to 15 mole % of an alpha-olefin other than propylene and (ii) a random 1-butene copolymer comprising ethylene and 1-butene, the weight ratio of the copolymer (i) to the copolymer (ii) being in the range of from 5:95 to 90:10, said random 1-butene copolymer (ii) satisfying the following conditions:

Crystalline random propylene copolymer composition and composite

A laminated structure comprising a substrate layer of a crystalline propylene resin and, positioned in direct contact with at least one surface of said substrate layer, a heat-sealable layer of a crystalline random propylene copolymer composition, wherein the crystalline random propylene copolymer composition is a mixture composed of

Laminated structure comprising a substrate layer composed of a

A process for producing a polymer or copolymer of 4-methyl-1-pentene, which comprises polymerizing 4-methyl-1-pentene or copolymerizing 4-methyl-1-pentene with up to about 20 mole % of an olefin having 2 to 20 carbon atoms in the presence of a catalyst comprising

Process for production of 4-methyl-1-pentene polymer or copolymer

A crystalline random propylene copolymer composition comprising (i) a crystalline random propylene copolymer comprising 99 to 85 mole % of propylene and 1 to 15 mole % of an alpha-olefin other than propylene and (ii) a random 1-butene copolymer comprising 1-butene and an alpha-olefin having at least 5 carbon atoms, the weight ratio of the copolymer (i) to the copolymer (ii) being in the range of from 5:95 to 90:10, said random 1-butene copolymer (ii) satisfying the following conditions:

A random copolymer consisting essentially of more than 60 to 99 mole % of 1-butene and less than 40 to 1 mole % of propylene, and having

Randum 1-butene copolymer

A process for the polymerization of butene-1 in a liquid aliphatic hydrocarbon medium in the presence of a catalyst composed of a titanium trihalide and an organoaluminum compound which comprises initially polymerizing a minor part of the butene-1 at a temperature within a range sufficiently low that a slurry of polymer in said medium is produced and then increasing the temperature of polymerization so that the greater part of the butene-1 is polymerized within a high temperature range higher than that of the initial polymerization but not at a temperature so high that the polymer formed dissolves in said medium, characterized in that (1) the initial polymerization is carried out at a temperature of not more than 20.degree. C. in the presence of said titanium trihalide in an amount of not less than 50 millimoles and up to 1,000 millimoles per liter of said medium, and then (2) the polymerization is carried out in the presence or absence of said medium at a temperature of 25.degree. C. to less than 48.degree. C. in the presence of said titanium trihalide in an amount up to one-fifth of that of the initial polymerization.

Process for polymerization of butene

A process for producing a 4-methyl-1-pentene copolymer composition by sequential polymerization, which comprises

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Hiroshima, Japan

Kunisuke Fukui