Mitsubishi Petrochemical Company Limited

Toyota Jidosha Kabushiki Kaisha

Mitsubishi Chemical Corporation

Yukitaka Goto

Takao Nomura

Takeyoshi Nishio

Hiroki Sato

Nobuya Kawamura

Ikuo Tsutsumi

Akihiko Uchikawa

Yumito Uehara

Takayuki Inoue

Tadashi Takahashi

Katsumi Hirakawa

Yoichi Maeda

Yoshiyuki Ishihama

Yoshihiko Sasaki

Nobuaki Sakurai

Seikou Nakano

Shigeru Takayama

Masataka Souda

Satoshi Nishimura

Ethylene-&agr;-olefin copolymer

An ethylene polymer which is useful for molding inflation film having a particularly excellent moldability is provided. The ethylene polymer is obtainable by the first and second steps and satisfying the following conditions (a) to (d):

Ethylene polymers

A thermoplastic polymer composition comprising: (i) 100 parts by weight of a thermoplastic polymer component which comprises an ethylene-propylene rubber, an ethylene copolymer and a propylene polymer (including an ethylene-propylene block copolymer), and (ii) 0 to 7 parts by weight of talc, the thermoplastic polymer component being composed of, according to fractionation using o-dichlorobenzene as a solvent, component (A) which is a component soluble in the solvent at 40.degree. C., component (B) which is a component insoluble in the solvent at 40.degree. C. but soluble at 110.degree. C., and component (C) which is a component insoluble in the solvent even at 110.degree. C. in such a proportion that the total amount of the components (A) and (B) is from 50 to 70 parts by weight, the weight ratio of the component (A) to the component (B) being from 0.5 to 1.5, and the amount of the component (C) is from 50 to 30 parts by weight.

Thermoplastic polymer composition

A thermoplastic polymer composition comprising: (i) 100 parts by weight of a thermoplastic polymer component which comprises an ethylene-propylene rubber, an ethylene copolymer and a propylene polymer (including an ethylene-propylene block copolymer), and (ii) 7 to 25 parts by weight of talc, the thermoplastic polymer component being composed of, according to fractionation using o-dichlorobenzene as a solvent, component (A) which is a component soluble in the solvent at 40.degree. C., component (B) which is a component insoluble in the solvent at 40.degree. C. but soluble at 110.degree. C., and component (C) which is a component insoluble in the solvent even at 110.degree. C. in such a proportion that the total amount of the components (A) and (B) is from 50 to 70 parts by weight, the weight ratio of the component (A) to the component (B) being from 0.5 to 1.5, and the amount of the component (C) is from 50 to 30 parts by weight; the composition having a flexural modulus of 10,000 to 20,000 kg/cm.sup.2.

An apparatus for fractionally measuring a polymer comprising: a flow path change valve unit A having an inlet for pouring a sample polymer solution, a loop for metering the sample polymer solution, an internal standard solution pouring mechanism including a loop for metering the liquid and a valve for pouring the liquid, and a valve for changing the system flow path; a composition fractionation unit B which is provided with a column filled with a filler, and which permits the polymer dissolved in the sample polymer solution transferred from the loop for metering the sample polymer solution to precipitate on the filler, and then fractionally dissolves the polymer by stepwisely raising the temperature in the column; a molecular size fractionation unit C which is provided with a column filled with a filler, and which fractionates, depending upon the molecular size, the sample polymer fraction solution which has undergone composition fractionation in the unit B and which is batchwisely transferred therefrom; a solvent feeding unit D which feeds at a predetermined flow rate a solvent for use in the fractional dissolution of the sample polymer in the unit B and for transferring the obtained sample polymer fraction solutions; a detection unit E which deflects the results of fractionation obtained in the unit C and measures the molecular weight distribution; a system controller; and automatic temperature controllers.

Apparatus for fractionally measuring polymers

A modified polyolefin composition having excellent physical properties such as bending rigidity, bending strength, impact strength, and the like can be prepared by melting and kneading a mixture of a radical generating agent such as benzoyl peroxide, a porous filler, and a polyolefin composed primarily of propylene and, if necessary, a polar vinyl monomer at a high temperature above the decomposition temperature of the radical generating agent.

Polypropylene composition modified with porous filler and a radical

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Yokkaichi, Japan

Yukitaka Goto