Method for producing microparticles of polylactic acid-based resin, microparticles of polylactic acid-based resin and cosmetic using same

A technology of polylactic acid-based resin particles, applied in cosmetics, cosmetics, cosmetic preparations, etc., can solve the problems of unclear manufacturing methods of polylactic acid-based resin particles

Active Publication Date: 2013-07-10
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Patent Document 7 does not disclose specific examples of polylactic acid-based resins, and the production method of polylactic acid-based resin particles is still unclear.

Method used

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  • Method for producing microparticles of polylactic acid-based resin, microparticles of polylactic acid-based resin and cosmetic using same
  • Method for producing microparticles of polylactic acid-based resin, microparticles of polylactic acid-based resin and cosmetic using same
  • Method for producing microparticles of polylactic acid-based resin, microparticles of polylactic acid-based resin and cosmetic using same

Examples

Experimental program
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Effect test

Embodiment

[0156] The present invention will be specifically described below based on examples, but the present invention is not limited by them.

[0157] (1) Determination of melting enthalpy and crystallization temperature

[0158] Using a differential scanning calorimeter (Robot DSC RDC220 manufactured by Seiko Instruments Co., Ltd.), the temperature was raised to 200°C at a rate of 20°C / min in a nitrogen atmosphere, and the temperature was measured from the area of ​​the peak showing the heat of fusion near 160°C. to calculate.

[0159] In addition, the crystallization temperature was measured using the above-mentioned device, after raising the temperature to 200°C under the same conditions, and then measuring it at a cooling rate of 1°C / min. melting temperature.

[0160] (2) Weight average molecular weight

[0161] (i) Molecular weight measurement of polylactic acid resin (A)

[0162] The weight average molecular weight is a molecular weight calculated by comparing with a calibr...

manufacture example 1

[0193] Production Example 1 Production method of polylactic acid 1

[0194] Add 70.2 g of L-lactide (manufactured by Aldrich: optical purity 98% ee or higher), 30.1 g of D-lactide (manufactured by Aldrich: optical purity 98% ee or higher) and 1.1 g of octanol into a stirring device In a reaction container, it was uniformly dissolved in a nitrogen atmosphere at 150° C., and then 0.90 g of tin octoate (manufactured by Aldrich) was added to a toluene solution adjusted to a concentration of 10% by mass in dry toluene, and a polymerization reaction was carried out for 6 hours. After completion of the polymerization reaction, the reactant was dissolved in chloroform, and reprecipitated while stirring in methanol, and the monomer and catalyst were removed to obtain a solid content. The obtained solid content was filtered, heated and vacuum-dried at 80° C. to obtain a polylactic acid-based resin having a copolymerization ratio of L / D=70 / 30, an enthalpy of fusion of 0 J / g, and a Mw (PM...

manufacture example 2

[0195] Production Example 2 Production method of polylactic acid 2

[0196] In addition to using 49.9 g of L-lactide (manufactured by Aldrich: optical purity of 98% ee or higher), 49.8 g of D-lactide (manufactured by Aldrich: optical purity of 98% ee or higher), 0.95 g of octanol, and tin octoate (Manufactured by Aldrich) except 0.95 g, under the same conditions as in Production Example 1, a polylactic acid-based resin having a copolymerization ratio of L / D=50 / 50, an enthalpy of fusion of 0 J / g, and a Mw (PMMA conversion) of 9800 was obtained. . The SP value of this polymkeric substance is 23.14 (J / cm2) by above-mentioned calculation method 3 ) 1 / 2 .

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Abstract

Provided are: a method for producing microparticles of a polylactic acid-based resin; porous microparticles of a polylactic acid-based resin, said microparticles having a small particle diameter, showing a high oil absorption ability and being appropriately usable for cosmetics; smooth-surfaced microparticles of a polylactic acid-based resin, said microparticles having a spherical form, showing a narrow particle diameter distribution and being appropriately usable for toners; and a cosmetic using the aforesaid microparticles of a polylactic acid-based resin. The method for producing microparticles of a polylactic acid-based resin comprises: dissolving a polylactic acid-based resin (A) and a polymer (B), which is different from polylactic acid-based resins, in an ether-type organic solvent (C); applying a shear force thereto to form an emulsion; and then contacting the emulsion with a poor solvent of the polylactic acid-based resin (A). According to this production method, porous microparticles of the polylactic acid-based resin, said microparticles having a fusion enthalpy of the polylactic acid-based resin (A) of 5 J/g or greater, having a small particle diameter and showing a high oil absorption ability, and smooth-surfaced microparticles of the polylactic acid-based resin, said microparticles having a fusion enthalpy less than 5 J/g, having a spherical form and showing a narrow particle diameter distribution, can be provided.

Description

technical field [0001] The present invention relates to a method for producing polylactic acid-based resin microparticles, polylactic acid-based resin microparticles, and cosmetics using the microparticles. Background technique [0002] Unlike polymer molded products such as films, fibers, injection molded products, and extrusion molded products, polymer microparticles are used for modification and improvement of various materials by utilizing their large specific surface area and microparticle structure. Main uses include modifiers for cosmetics, additives for toners, rheology modifiers for paints, etc., diagnostic test agents for medical use, additives for molded articles such as automotive materials and building materials, and the like. [0003] On the other hand, as people's concern about environmental issues has increased in recent years, the use of materials derived from non-petroleum raw materials has begun to be required for the purpose of reducing environmental load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14A61K8/85C08J9/28
CPCA61K8/0241A61K8/0279A61K8/85A61K2800/412A61Q1/02A61Q1/10C08J3/14C08J9/26C08J9/28C08J2367/04G03G9/0804G03G9/08722G03G9/08762G03G9/08775Y10T428/2982C08G63/08C08G63/81G03G9/0802G03G9/0821
Inventor 竹崎宏小林博斋藤真希子浅野到
Owner TORAY IND INC
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