Kureha Kagaku Kogyo K.k.

Kureha Kagaku Kogyo Kabushiki Kaisha

Toyo Boseki Kabushiki Kaisha

Tsutsunaka Plastic Kogyo Kabushiki Kaisha

Mitsuru Hoshino

Yukichika Kawakami

Zenya Shiiki

Toshitaka Kouyama

Nobuo Sato

Hiroyuki Sato

Haruhiko Yusa

Masaki Ohya

Takayuki Katto

Yoshikatsu Satake

Ken Kashiwadate

Takeo Ogihara

Chikara Sugitawa

Masayasu Suzuki

Hironobu Furusawa

Katsumi Suzuki

Haruki Isaka

Kazuaki Maruyama

Yasuhiro Kadota

Akira Kurosaki

Yuichika Kawakami

Shuji Morinishi

Gas-barrier, multi-layer hollow container

A composite gas barrier film having a layer structure comprises a thermoplastic resin film laminated on at least one side of a film formed from polyglycolic acid containing at least 60 wt. % of a repeating unit represented by the following formula (1):

Gas-barrier composite film

The invention provides an injection-molded product of polyglycolic acid obtainable by molding a thermoplastic resin material at an injection temperature ranging from the melting point, Tm of the polymer to 255&deg; C., wherein the thermoplastic resin material comprises polyglycolic acid having a repeating unit represented by the following formula (1):

Production process for injection-molded product of polyglycolic acid

The invention provides a stretch blow molded container formed from a thermoplastic resin material which comprises polyglycolic acid having (a) a repeating unit represented by the following formula (1): ##STR1## (b) a melt viscosity, .eta.* [as measured at a temperature of (the melting point, Tm of the polymer+20.degree. C.) and a shear rate of 100/sec] of 500-100,000 Pa.s; (c) a melting point, Tm of at least 180.degree. C.; (d) a melt enthalpy, .DELTA.Hm of at least 20 J/g; and (e) a density of at least 1.50 g/cm.sup.3 as measured in an unoriented, crystallized form, wherein the stretch blow molded container has tensile strength (in a circumferential direction) of at least 100 MPa and a carbon dioxide permeability (as measured at a temperature of 23.degree. C. and 80% relative humidity; in terms of the thickness of 50 .mu.m) of 300 cc/m.sup.2.day.atm or smaller at the body sidewall thereof, and a production process thereof.

Stretch blow molded container and production process thereof

An injection-molded product is obtained by injection molding a thermoplastic resin material. The thermoplastic resin material comprises a polyglycolic acid homopolymer or copolymer having a repeating unit represented by the following formula (1): ##STR1## in a proportion not lower than 70 wt. % and a repeating unit derived from at least one cyclic comonomer selected from the group consisting of ethylene oxalate and lactide in a proportion not higher than 30 wt. %, and having the following physical properties: (a) a melt viscosity, n*, measured at a temperature of the melting point, Tm, of the polyglycolic acid homopolymer or copolymer +20.degree. C. and a shear rate of 1,000/sec, of 30-10,000 Pa.multidot.s; (b) a melting point, Tm, of at least 150.degree. C.; (c) a melt enthalpy, .DELTA.Hm, of at least 20 J/g; and (d) a density of at least 1.50 g/cm.sup.3 as measured in an unoriented, crystallized form. The injection-molded product has Izod impact strength, unnotched, 25.degree. C., of at least 20 kJ/m.sup.2, tensile strength of a least 60 MPa, tensile elongation of at least 5%, flexural strength of at least 100 MPa, and flexural modulus of at least 5 GPa, and is obtained by injection molding at an injection temperature ranging from the melting point, Tm, of the homopolymer or copolymer to 255.degree. C.

Injection-molded product of polyglycolic acid and production process

The invention provides a stretch blow molded container formed from a thermoplastic resin material which comprises polyglycolic acid having

The invention provides a polyglycolic acid sheet obtainable by melt-extruding a thermoplastic resin material into a sheet in a temperature range of from the melting point, Tm of the polymer to 255.degree. C., wherein the thermoplastic resin material comprises polyglycolic acid having a repeating unit represented by the following formula (1): ##STR1## and the following physical properties: (a) the melt viscosity, .eta.* �as measured at a temperature of (the melting point, Tm of the polymer+20.degree. C.) and a shear rate of 100/sec! being 500-100,000 Pa.s;

Polyglycolic acid sheet and production process thereof

The invention provides an oriented polyglycolic acid film formed from a thermoplastic resin material which comprises polyglycolic acid having a repeating unit represented by the following formula (1): ##STR1## and the following physical properties: (a) the melt viscosity, .rho.* �as measured at a temperature of (the melting point, Tm of the polymer+20.degree. C.) and a shear rate of 100/sec! being 500-100,000 Pa.s;

Oriented polyglycolic acid film and production process thereof

Disclosed herein is a process for the production of an alkylene thioether-arylene thioether copolymer, which comprises copolymerizably reacting a compound having at least one alkali thiolate group and obtained by causing an alkali metal sulfide to act on a poly(arylene thioether) in a water-containing polar organic solvent so as to depolymerize the poly(arylene thioether) with a dihalogen-substituted aliphatic compound in a water-containing polar organic solvent.

Production process of alkylene thioether-arylene thioether copolymer

A polycarbonate resin composition is given as a mixture of (A) 97-50 wt. % of a polycarbonate resin, and (B) 3-50 wt. % of a graft copolymer. The graft copolymer is obtained by graft-polymerizing 50-95 wt. parts of a monomer selected from (b1) a monomer mixture comprising 60-90 wt. % of an aromatic vinyl monomer, 40-10 wt. % of a vinyl cyanide monomer, and 0-30 wt. % of a monomer copolymerizable with the monomers and (b2) an alkyl methacrylate having an alkyl group including 1-4 carbon atoms in the presence of a latex containing 5-50 wt. parts of a rubber polymer with respect to the total of the monomer and the rubber polymer as 100 wt. parts. The graft copolymer includes a graft-polymerized component having a weight-average molecular weight 50.times.10.sup.4 -300.times.10.sup.4. The polycarbonate resin composition shows a good extrudability and provides a sheet product which exhibits good thermoforming characteristics, such as suppressed drawdown and good deep drawability.

Polycarbonate resin composition and molded product thereof

Composition comprising polyarylene sulfide and polyamide composition

Disclosed herein is a process for the production of an arylene thioether copolymer (C), wherein an alkali metal sulfide is caused to act on a poly(arylene thioether) (A) having predominant recurring units of the formula [I]: ##STR1## wherein R denotes an alkyl group having 1-6 carbon atoms, and 1 stands for 0 or an integer of 1-4, in a water-containing polar organic solvent so as to depolymerize the poly(arylene thioether) (A), thereby preparing a prepolymer (B) having an alkali thiolate group on at least one terminal thereof and the resultant prepolymer (B) is then subjected to a polymerization reaction with at least one dihalogen-substituted aromatic compound.

Production process of arylene thioether copolymer

Disclosed herein are a process for the preparation of a carboxylated arylene thioether oligomer, in which an alkali metal sulfide is caused to act on a poly(arylene thioether) so as to depolymerize the poly(arylene thioether), thereby preparing an alkali thiolate-containing oligomer, and a carboxylating agent is then caused to act on the alkali thiolate-containing oligomer, thereby forming the carboxylated arylene thioether oligomer, and a process for the production of an arylene thioether copolymer, wherein the carboxylated arylene thioether oligomer alone, which has been obtained in accordance with this preparation process, or a mixture of the carboxylated oligomer in an amount of at least 50 wt. % and another carboxylic compound in an amount less than 50 wt. % is reacted with an alkylenediol or an alkylenediol and a polyester or an alkylene diol and a lactone.

Growing community of inventors

Iwaki, Japan

Mitsuru Hoshino