摘要:
It is an object of the present invention to provide polylactic acid containing a stereocomplex crystal and having excellent moldability, a high molecular weight, high crystallinity and a high melting point and a process for manufacturing the same. It is another object of the present invention to provide a composition comprising the polylactic acid and a molded product of the polylactic acid. The present invention is characterized from polylactic acid having a weight average molecular weight of 80,000 to 500, 000 and a melting peak at 195°C or higher which accounts for 80 % or more of the total of melting peaks in the temperature elevation step when measured by a differential scanning calorimeter (DSC) and a process for manufacturing the same.
摘要:
There are provided a resin composition comprising a polylactic acid which (i) comprises a poly-L-lactic acid (component B-1) and a poly-D-lactic acid (component B-4), (ii) has a weight ratio of the component B-1 to the component B-4 (component B-1/component B-4) of 10/90 to 90/10, and (iii) shows a proportion of melt peaks at 195°C or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 20%; a molded article of the resin composition; and methods for producing the resin composition and the molded article.
摘要:
A microneedle and a microneedle array which can support not only a drug but also a stabilizer and a thickener in large quantities and have excellent puncture property. The microneedle is used to administer a drug transdermally and comprises a top section, a shaft section and a base section, wherein (i) the tip apex angle (±) is 15 to 60°; (ii) the tip diameter (D 0 ) is 1 to 20 µm; (iii) the area (A 3 ) of the top surface of the base section is larger than the area (A 2 ) of the bottom surface of the shaft section; (iv) the following expressions (1) and (2) are satisfied H / D 4 ‰§ 3 (H is the overall height, and D 4 is the diameter of the bottom surface of the base section) ² ‰§ 90 - 0.5 �¢ ± (² is the angle formed between the side surface of the shaft section and the top surface of the base section, and ± is the tip apex angle.); and (v) a solid composition containing a drug is fixed to the side surface of the shaft section and the following expression (5) is satisfied. 10 �¢ ° ‰¦ ³ ‰¦ 60 �¢ ° (³ is the angle formed by tangent lines connecting the apex of the top section and the surface of the solid composition fixed to the side surface of the shaft section.)
摘要:
It is an object of the present invention to produce a polylactic acid having a high molecular weight such as a weight average molecular weight (Mw) of more than 100,000 from which only a stereocomplex crystal is grown even by repeating melting and crystallization. The present invention is a process of producing a polylactic acid, comprising the steps of: (i) obtaining a solid by kneading together poly (L-lactic acid) and poly(D-lactic acid) at a temperature of 160 to 225°C and crystallizing the kneaded product; and (ii) melt kneading the obtained solid.
摘要:
To provide a resin composition having high heat resistance with a high melting point and excellent melt stability and hydrolysis resistance, a molded article of the resin composition and a method of manufacturing the resin composition; the resin composition comprises an aromatic polyester (component A) having a butylene terephthalate skeleton as the main constituent unit and polylactic acid (component B) having a melting point of 190°C or higher.
摘要:
A polycarbonate comprising ether diol residues which can be produced from a carbohydrate of the formula: (1) and comprising diol residues of the formula: -O-(CmH2m)-O- (2) (wherein m is an integer of 2 to 12), wherein the ratio of ether diol residues to all the diol residues is in the range of 65 to 98 wt.%, the polycarbonate having a glass transition temperature of 90°C or higher.
摘要:
Provided is a button obtained by using a biomass material. The button has a heat deformation temperature of 160°C or more, and high quality as follows; excellent in heat resistance, high in strength, excellent in dyeing properties, and also capable of having transparency to semi-transparency and/or glossiness.