Sumitomo Chemical Company, Limited

Hiroyuki Sugimoto

Yoshihiro Nakatsuji

Toshio Igarashi

Satoru Funakoshi

Susumu Ejiri

Kohsuke Ohtani

Masayuki Tatsumi

Kenzou Chikanari

Hidetake Hozumi

Satoru Moritomi

Shigeo Tanaka

Harunori Fujita

Yuji Gotoh

Shinichiro Nagai

A thermoplastic elastomer composition for powder molding comprising 100 parts by weight of a polyolefin-based resin(A) and 10 to 1000 parts by weight of a specific hydrogenated vinyl aromatic compound-conjugated diene-based block copolymer(B), a powder of the thermoplastic elastomer composition, a method for powder molding the same, a molded article obtained by the method for powder molding, and a multi-layer molded article containing the molded article as one layer.

Thermoplastic elastomer composition for powder molding, powder and molded article thereof

An olefin-based thermoplastic elastomer composition for powder molding is described. The olefin-based thermoplastic elastomer composition produces no emission of poisonous gas at incineration. It is hardly whitened on bending and has excellent flexibility.

Thermoplastic olefin elastomer composition for powder molding, powder for powder molding, and molded object

A thermoplastic elastomer composition comprising 100 parts by weight of a polyolefin resin, 5 to 250 parts by weight of a rubbery polymer and 0 to 500 parts by weight of an ethylene-&agr;-olefin copolymer rubber, wherein a complex dynamic viscosity &eegr;*(1) at 250&deg; C. is 1.5&times;10 poise or less and a Newtonian viscosity index n is 0.67 or less, and furthermore, wherein said thermoplastic elastomer composition has a specific tan &dgr; peak, the peak temperature of which is different from that of the polyolefin resin and that of the rubbery polymer, at a temperature within the range from &minus;70 to 30&deg; C. in a temperature dependence curve of tan &dgr; determined by solid dynamic viscoelasticity measurement, powder or pellet thereof, and a molded article thereof.

Thermoplastic elastomer composition, powder or pellet of the same, and molded article comprising the same

Thermoplastic elastomer composition, powder, pellets, and moldings

Thermoplastic elastomer composition powder, powder molding process with the same, and moldings

A thermoplastic elastomer composition powder comprising a thermoplastic elastomer composition represented by the following (A), having a sphere-reduced average diameter of not more than 1.2 mm and a bulk specific gravity of not less than 0.38: (A) a thermoplastic elastomer composition comprising (a) 100 parts by weight of a polyolefin resin; (b) 20 to 250 parts by weight of a conjugated diene polymer of hydrogenated conjugated diene copolymer having a hydrogenation degree of not less than 70%, which is prepared by hydrogenating a conjugated diene-vinyl aromatic compound random copolymer in which the content of a vinyl aromatic compound unit is not more than 25% by weight; and (c) 0 to 500 parts by weight of an ethylene/&agr;-olefin copolymer rubber. This powder can give a molded article having excellent appearance and flexibility, which does not cause whitening easily on bending, according to the powder molding method.

Powdery thermoplastic elastomer composition and articles obtained by molding same

A thermoplastic elastomer composition comprising (a) 100 wt. parts of a polyolefin resin, (b) 5 to 250 wt. parts of an ethylene-&agr;-olefin copolymer rubber in which the content of the &agr;-olefin units is at least 50 wt. %, and (c) 0 to 500 wt. parts of an ethylene-&agr;-olefin copolymer rubber in which the content of the &agr;-olefin units is less than 50 wt. %. This composition can provide a molded article which is hardly whitened when it is bent, and has good flexiblity.

Thermoplastic elastomer composition and powder and molded article thereof

A thermoplastic elastomer composition comprising 100 parts by weight of a polyolefin resin, 5 to 250 parts by weight of a rubbery polymer and 0 to 500 parts by weight of an ethylene-&agr;-olefin copolymer rubber, wherein a complex dynamic viscosity &eegr;*(1) at 250&deg; C. is 1.5&times;10,poise or less and a Newtonian viscosity index n is 0.67 or less, and furthermore, wherein said thermoplastic elastomer composition has a specific tan &dgr; peak, the peak temperature of which is different from that of the polyolefin resin and that of the rubbery polymer, at a temperature within the range from &minus;70 to 30&deg; C. in a temperature dependence curve of tan &dgr; determined by solid dynamic viscoelasticity measurement, powder or pellet thereof, and a molded article thereof.

A multi-layer molded article having a skin material layer made of a vinyl chloride resin, a propylene resin core, and an adhesive layer present between the skin material layer and the core, in which the adhesive layer includes (A) a layer having (a) a sublayer containing a polyester resin and an epoxy group-containing ethylene copolymer, which is bonded to the skin material of the vinyl chloride resin, and (b) a sublayer containing at least one copolymer selected from an ethylene copolymer and an epoxy group-containing copolymer, which is bonded to said propylene resin core, or (B) a layer obtained from an ethylene resin composition containing a polybasic carboxylic acid and an epoxy-group containing copolymer (c) which contains ethylene units, unsaturated carboxylic acid glycidyl ester units or unsaturated glycidyl ether units and an ethylenically unsaturated ester units other than the unsaturated carboxylic acid glycidyl ester units.

Method for producing a multi-layer molded article

Thermoplastic elastomer composition and molded article comprising the

A method is described for producing a molded article by molding a thermoplastic elastomer powder having a sphere-reduced average diameter of 0.7 mm or less, a bulk specific gravity of at least 0.38 and a failing property of 20 second/100 ml or less, wherein the thermoplastic elastomer contains an elastomeric ethylene-.alpha.-olefin copolymer and a polyolefin resin and has a complex dynamic viscosity .eta.*(1) of 1.5.times.10.sup.5 poise or less when measured at 250.degree. C. at a frequency of 1 radian/sec., and a Newtonian viscosity index n of 0.67 or less, in which the Newtonian viscosity index n is calculated according to the following formula:

Method for producing molded article by powder slush molding a

The present invention provides a polyethylenic foaming composition comprising (a) 100 parts by weight of an ethylenic copolymer having glycidyl groups consisting of 20 to 99.9% by weight of ethylene units, 0.1 to 30% by weight of a unit of a glycidyl ester of an unsaturated carboxylic acid or an unsaturated glycidyl ether, and 0 to 50% by weight of ethylenically unsaturated ester units other than a glycidyl ester, (b) 0.1 to 30 parts by weight of a carboxylic acid having 2 or more carboxyl groups and a molecular weight of 1500 or less, and (c) 0.1 to 20 parts by weight of a foaming agent of a thermal decomposition type. The present invention also provides a polyethylenic foam molded from said foaming composition. In addition, the present invention provides a molded composite foam having a foam layer molded from a powder of said foaming composition and a non-foam layer molded from a composition powder containing a certain thermoplastic elastomer, as well as a multilayer molded article containing said molded composite foam.

Polyethylenic foaming compositions and molded foams

The present invention provides a polyethylenic foaming composition comprising (a) 100 parts by weight of an ethylenic copolymer having glycidyl groups consisting of 20 to 99.9% by weight of ethylene units, 0.1 to 30% by weight of a unit of a glycidyl ester of an unsaturated carboxylic acid or an unsaturated glycidyl ether, and 0 to 50% by weight of ethylenically unsaturated ester units other than a glycidyl ester, (b) 0.1 to 30 parts by weight of a carboxylic acid having 2 or more carboxyl groups and a molecular weight of 1500 or less, and (c) 0.1 to 20 parts by weight of a foaming agent of a thermal decomposition type. The present invention also provides a polyethylenic foam molded from said foaming composition. In addition, the present invention provides a molded composite foam having a foam layer molded from a powder of said foaming composition and a non-foam layer molded from a composition powder containing a certain thermoplastic elastomer, as well as a multilayer molded article containing said molded composite foam. According to the present inventive polyethylenic foaming composition, a foam having excellent lightness in weight, excellent cleanness, uniformly foamed cells, high expansion ratio, and excellent impact resilience can be obtained.

Growing community of inventors

Funabashi, Japan

Hiroyuki Sugimoto