Toray Industries, Inc.

Natureworks LLC

Yoshitake Takahashi

Hiroyuki Ome

Takuma Naotsuka

Kazuhiro Tanahashi

Mitsushige Hamaguchi

Masaki Fujita

Megumi Nakanishi

Tatsuya Nagano

Ken Sudo

Toru Takahashi

Yasufumi Yamamura

Yasuto Tachibana

Masaaki Fujita

Provided is a method of recovering gaseous hydrocarbons and/or liquid hydrocarbons from underground, characterized by using a polylactic acid) resin comprising an a poly-L-lactic acid component and a poly-D-lactic acid component and having a heat of fusion at 190&#xb0; C. or higher, as measured by differential scanning calorimetry, of 20 J/g or more, wherein the underground is at a depth of 3,000 m or deeper. According to the recovery method of the present invention, shale gas, shale oil, and the like can be recovered efficiently.

Method for recovery of gaseous hydrocarbons and/or liquid hydrocarbons from underground

A polylactic acid resin composition includes: 0.005 parts by weight to 1.2 parts by weight of a metal phosphate represented by Formula (1):MHPO&#x2003;&#x2003;(1)(in Formula (1), M is an alkali metal atom or an alkaline earth metal atom, and x, y, and z are integers satisfying 1&#x2266;x&#x2266;2, 1&#x2266;y&#x2266;4, and 2&#x2266;z&#x2266;8, respectively) with respect to 100 parts by weight of a polylactic acid resin including a poly-L-lactic acid component and a poly-D-lactic acid component, wherein a crystallization enthalpy of crystals in the polylactic acid resin is not less than 5 J/g when a temperature of the polylactic acid resin composition is increased to 250&#xb0; C., and the temperature is kept constant for 3 minutes, followed by decreasing the temperature at a cooling rate of 20&#xb0; C./min in differential scanning calorimetry.

Polylactic acid resin composition, molded product, and method of manufacturing polylactic acid resin composition

A method of producing a polylactic acid block copolymer constituted of a segment(s) composed of L-lactic acid units and a segment(s) composed of D-lactic acid units, includes obtaining a mixture by mixing poly-L-lactic acid and poly-D-lactic acid one of which has a weight average molecular weight of 60,000 to 300,000 and the other of which has a weight average molecular weight of 10,000 to 50,000, the mixture having a weight average molecular weight of not less than 90,000 and a degree of stereocomplexation (Sc) satisfying: Sc=&#x394;Hh/(&#x394;Hl+&#x394;Hh)&#xd7;100&#x3e;60 (wherein &#x394;Hh represents the heat of fusion of stereocomplex crystals (J/g), and &#x394;Hl represents the heat of fusion of crystals of poly-L-lactic acid alone and crystals of poly-D-lactic acid alone (J/g)); and subsequently subjecting the mixture to solid-phase polymerization at a temperature lower than the melting point of the mixture.

Method for producing polylactic acid block copolymer

A method for producing a crystallized polyester comprises the crystallization step of applying a shear and/or a pressure to a polyester selected from an aliphatic polyester and a polyalkylene terephthalate at a temperature of (Tm&#x2212;70&#xb0; C.) to (Tm+20&#xb0; C.), where Tm is a melting point of the polyester, thereby converting the polyester into a state having a crystallinity of 10% or more and fluidity.

Method for producing crystallized polyester

A biodegradable particle including a block copolymer produced by copolymerization of a biodegradable copolymer having a structure composed of hydroxycarboxylic acid a1, whose homopolymer produced by homopolymerization has a glass transition point of not less than 40&#xb0; C., and hydroxycarboxylic acid a2, whose homopolymer produced by homopolymerization has a glass transition point of not more than &#x2212;40&#xb0; C.; a water-soluble polymer comprising a functional group selected from the group consisting of a hydroxyl group, amino group and carboxylic acid group at each of both ends; and a polyvalent compound comprising 2 or more functional groups each selected from the group consisting of a hydroxyl group, amino group and carboxylic acid group; wherein a ratio of mass of said structure composed of hydroxycarboxylic acid a2 to mass of said biodegradable copolymer is 30 to 90% by mass.

Biodegradable particle, vascular embolization material and method for producing biodegradable particles

Growing community of inventors

Nagoya, Japan

Yoshitake Takahashi