Title:
METHOD FOR PRODUCING MICROPARTICLES OF POLYLACTIC ACID-BASED RESIN, MICROPARTICLES OF POLYLACTIC ACID-BASED RESIN AND COSMETIC USING SAME
Document Type and Number:
WIPO Patent Application WO/2012/105140
Kind Code:
A1
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.
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Inventors:
TAKEZAKI HIROSHI (JP)
KOBAYASHI HIROSHI (JP)
SAITO MAKIKO (JP)
ASANO ITARU (JP)
KOBAYASHI HIROSHI (JP)
SAITO MAKIKO (JP)
ASANO ITARU (JP)
Application Number:
PCT/JP2011/079776
Publication Date:
August 09, 2012
Filing Date:
December 22, 2011
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
TAKEZAKI HIROSHI (JP)
KOBAYASHI HIROSHI (JP)
SAITO MAKIKO (JP)
ASANO ITARU (JP)
TAKEZAKI HIROSHI (JP)
KOBAYASHI HIROSHI (JP)
SAITO MAKIKO (JP)
ASANO ITARU (JP)
International Classes:
C08J3/14; A61K8/85; C08J9/28
Domestic Patent References:
| WO2009142231A1 | 2009-11-26 |
Foreign References:
| JP2004269865A | 2004-09-30 | |||
| JP2005200663A | 2005-07-28 | |||
| JP2012011268A | 2012-01-19 | |||
| JP2000007789A | 2000-01-11 | |||
| JP2001288273A | 2001-10-16 | |||
| JP2005002302A | 2005-01-06 | |||
| JP2009242728A | 2009-10-22 | |||
| JP2004269865A | 2004-09-30 | |||
| JP2005200663A | 2005-07-28 |
Other References:
See also references of EP 2660272A4
HIDEKI YAMAMOTO: "HE BASIS, APPLICATION AND CALCULATION METHOD OF SP VALUE", 31 March 1999, JOHOKIKO CO., LTD.
J. BRAND: "POLYMER HANDBOOK", 1998, WILEY, PUBLISHED
HIDEKI YAMAMOTO: "HE BASIS, APPLICATION AND CALCULATION METHOD OF SP VALUE", 31 March 1999, JOHOKIKO CO., LTD.
J. BRAND: "POLYMER HANDBOOK", 1998, WILEY, PUBLISHED
Attorney, Agent or Firm:
BAN Toshimitsu et al. (JP)
Toshimitsu Ban (JP)
Toshimitsu Ban (JP)
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Claims: