Mitsubishi Kasei Corporation

Mitsubishi Chemical Industries Limited

Itaru Todoriki, Director of Agency of Industrial Science and Technology

Osamu Kishiro

Ken Honma

Hideaki Tanaka

Seiichi Nozawa

Hitoshi Matsumoto

Katsuji Tanaka

Takuji Hirahara

Atsushi Kasai

Yasuyuki Sakata

Rie Shirahama

Hiroshi Kamata

Atsushi Murakami

Toru Tanaka

Seigo Okumura

Junichi Matsuura

Yoshiteru Kobayashi

Hideko Sakai

Yumiko Inagaki

Chieko Muramoto

Nobuaki Gohko

A method for producing a liquid crystalline polyester, which comprises reacting compounds of the following formulas: ##STR1## and a dicarboxylic acid of the following formula ##STR2## wherein R.sup.1 is a bivalent aromatic hydrocarbon group having from 6 to 18 C atoms as starting material, for polycondensation in a molten state.

Liquid crystalline polyesters and methods for their production

A liquid crystalline polyester comprising dicarboxylic acid units of the following formula (1): ##STR1## wherein R.sup.1 is a bivalent aromatic hydrocarbon group having from 6 to 18 carbon atoms, diol units of the following formula (2):

A hollow article or sheet of a copolyester which comprises, as main components, terephthalic acid as a dicarboxylic acid component and ethylene glycol as a diol component and which is characterized by: (1) isophthalic acid as a dicarboxylic acid component being from 0.5 to 3.0 mol %, (2) diethylene glycol as a diol component being from 1.0 to 2.5 mol %, (3) the intrinsic viscosity being from 0.60 to 1.50 dl/g, (4) the concentration of terminal carboxyl groups being at most 18 eq/ton, and (5) the content of a cyclic trimer being at most 0.40% by weight.

Hollow container and stretched film made of a copolyester

A copolyester which comprises, as main components, terephthalic acid as a dicarboxylic acid component and ethylene glycol as a diol component and which is characterized by:

Copolyester, and hollow container and stretched film made thereof

The aromatic polyester and aromatic polyester-amide of the present invention have an excellent heat resistance (soldering resistance) and are excellent in fluidity, and therefore, excellent in moldability, because they show liquid crystallinity in a molten state. In view of mechanical characteristics, the aromatic polyester and aromatic polyester-amide of the present invention have a high modulus of elasticity and are excellent in mechanical strength. In addition, the aromatic polyester and aromatic polyester-amide of the present invention have an advantage that they can be molded at a temperature of 350.degree. C. or below, especially, 320.degree. C. or below. The aromatic polyester and aromatic polyester-amide of the present invention have utility in injection molded articles, films, fibers, etc., due to the above properties thereof. In addition, the aromatic polyester and aromatic polyester-amide of the present invention become molten state at a temperature of 320.degree. C. or below, therefore, the aromatic polyester and aromatic polyester-amide can be drawn out from a reaction vessel by application of pressure or by gravity after completion of polymerization, when the polymer is produced by melt polymerization method. This is another advantage of the present invention.

Aromatic polyester, aromatic polyester-amide and processes for producing

A wholly aromatic polyester consisting essentially of:

Wholly aromatic polyester and process for its production

A process for producing a copolymeric polyester, which comprises a first step of preparing a copolymeric oligomer by reacting a starting material oligoester or polyester having repeating units of the formula: ##STR1## wherein R.sub.1 is a divalent aromatic hydrocarbon group having from 6 to 10 carbon atoms, a divalent alicyclic hydrocarbon group having from 4 to 20 carbon atoms or/and a divalent aliphatic hydrocarbon group having from 1 to 40 carbon atoms (provided a hydrogen atom in the aromatic ring of the aromatic hydrocarbon group may be substituted by a halogen atom or an alkyl or alkoxy group having from 1 to 4 carbon atoms), and R.sup.2 is a divalent aliphatic hydrocarbon group having from 2 to 40 carbon atoms, a divalent alicyclic hydrocarbon group having from 4 to 20 carbon atoms, or a divalent radical of polyalkylene oxide having a molecular weight of from 80 to 8000, in an amount from 5 to 95 mol % as represented by the amount of the repeating units constituting the oligoester or polyester, with from 5 to 95 mol % of a hydroxycarboxylic acid of the formula:

Process for producing a copolyester

A selective gas separator composed essentially of a reaction product of copper compound with an imidazole, a pyrazole, a triazole and/or a tetrazole.

Selective gas separator

A polyolefin is producing by polymerizing ethylene or copolymerizing ethylene and the other .alpha.-olefin at 50.degree. to 100.degree. C. in a hydrocarbon solvent in the presence of a catalyst system of an organoaluminum compound and a transition metal compound component which is a solid catalytic component containing a magnesium compound and a titanium compound under the condition (a) two step polymerizations of a first polymerization step and a second polymerization step in the presence of a reaction mixture obtained by said first polymerization step; (b) a polymerization in the presence of hydrogen at a molar ratio of H.sub.2 to C.sub.2 H.sub.4 (vapor phase) of 0.01-0.8 to produce a polymer A having a viscosity average molecular weight of 2.times.10.sup.5 -7.times.10.sup.5 at a ratio of 30 to 70 wt. % based on the total polymer in one of said first or second polymerization step and a polymerization in the presence of hydrogen at a molar ratio of H.sub.2 to C.sub.2 H.sub.4 (vapor phase) of 1.5-15 to produce a polymer B having a viscosity average molecular weight of 1.times.10.sup.4 - 4.times.10.sup.4 at a ratio of 70 to 30 wt. % based on the total polymer in the other polymerization step to give a ratio of a viscosity average molecular weight of polymer A to a viscosity average molecular weight of polymer B of 15 to 55; (c) said production of said polymer A as a copolymer of ethylene and other .alpha.-olefin and said production of said polymer B as a homopolymer of ethylene or a copolymer of ethylene and the other .alpha.-olefin; and (d) said production of the total polymer as a polymer having a melt index of less than 0.5 g/10 min.

Growing community of inventors

Atsugi, Japan

Osamu Kishiro