Ome
Hiroyuki Ome, Aichi JP
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20110065871 | METHOD FOR PRODUCING ALIPHATIC POLYESTER RESIN, AND AN ALIPHATIC POLYESTER RESIN COMPOSITION - A method for producing an aliphatic polyester resin including a melt polymerization step and a subsequent solid phase polymerization step, using a sulfonic acid group-containing compound as a catalyst, wherein the addition amount of the sulfonic acid group-containing compound during melt polymerization is 300 to 3000 ppm with respect to a raw material monomer calculated as sulfer atoms, the content of the sulfonic acid group-containing compound during melt polymerization is 300 to 3000 ppm with respect to a produced polymer calculated as sulfer atoms, and a residual rate of the sulfonic acid group-containing compound after solid phase at polymerization is more than 50%. | 03-17-2011 |
Hiroyuki Ome, Tokai-Shi JP
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20120065342 | METHOD FOR PRODUCING CRYSTALLIZED POLYESTER - 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−70° C.) to (Tm+20° 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. | 03-15-2012 |
20130197186 | PROCESS FOR PRODUCTION OF POLY(LACTIC ACID)-TYPE RESIN, AND POLY(LACTIC ACID)-TYPE PREPOLYMER - A method of producing a poly(lactic acid) resin includes carrying out direct polycondensation using lactic acid as a main raw material to prepare a crystallized prepolymer having a weight average molecular weight of 5,000 to 25,000, an enthalpy of fusion ΔHm of 50 to 65 J/g and an acid value A mol/ton satisfying (1) below: | 08-01-2013 |
20140142276 | POLYLACTIC ACID RESIN AND METHOD FOR PRODUCING SAME - The present invention is directed to a method for producing a polylactic acid resin, including the step of subjecting a crystallized prepolymer, which is a prepolymer including a lactic acid unit as a main component, and has an optical purity (Ea) of 60 to 94%, a weight average molecular weight of 5,000 to 100,000, and a crystal melting enthalpy (ΔHma) of 4 to 50 J/g, to solid phase polymerization. According to the present invention, it is possible to obtain a polylactic acid resin which is excellent in moldability upon melt processing and drawdown resistance upon melt processing, and is also excellent in hydrolysis resistance. | 05-22-2014 |
Hiroyuki Ome, Nagoya JP
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20130158209 | METHOD FOR PRODUCING POLYLACTIC ACID BLOCK COPOLYMER - 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=ΔHh/(ΔHl+ΔHh)×100>60 (wherein ΔHh represents the heat of fusion of stereocomplex crystals (J/g), and ΔHl 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. | 06-20-2013 |
Hiroyuki Ome, Tokai JP
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20130165601 | POLYLACTIC ACID BLOCK COPOLYMER - A polylactic acid block copolymer constituted by a poly-L-lactic acid segment(s) contains as a major component L-lactic acid and a poly-D-lactic acid segment(s) contains as a major component D-lactic acid, the polylactic acid block copolymer satisfying Inequalities (1) and (2): Sc=ΔHh/(ΔHl+ΔHh)×100>80 (1); 1<(Tm−Tms)/(Tme−Tm)<1.8 (2). The polylactic acid block copolymer has excellent transparency, heat resistance and mechanical properties, which forms a polylactic acid stereocomplex. | 06-27-2013 |