METHOD FOR PRODUCING ELLIPTICAL, NEEDLE-SHAPED, OR ROD-SHAPED POLYMER PARTICLES

Title:

METHOD FOR PRODUCING ELLIPTICAL, NEEDLE-SHAPED, OR ROD-SHAPED POLYMER PARTICLES

Document Type and Number:

WIPO Patent Application WO/2016/181878

Kind Code:

A1

Abstract:

A method for producing elliptical, needle-shaped, or rod-shaped polymer particles satisfying (1)-(3) below is provided which includes a step in which a synthesis solution including water, a mixed solvent of a hydrophilic organic solvent and a hydrophobic organic solvent, a polymeric stabilizer, a polymerization initiator, and an unsaturated monomer is heated, and, at least after the heating has started, the pH of the synthesis solution is adjusted to 5-9 inclusive to perform solution polymerization: (1) the average (LAV) length (L) in a two-dimensional projection diagram obtained by irradiating the particles with light from a direction orthogonal to the longitudinal direction is 0.1-80 µm; (2) the average (DAV) breadth (D) in the two-dimensional projection diagram obtained by irradiating the particles with light from the direction orthogonal to the longitudinal direction is 0.05-40 µm; and (3) the average (PAV) aspect ratio (L/D) calculated from the length (L) and the breadth (D) is 1.5-30.

Inventors:

HAYAKAWA KAZUTOSHI (JP)
HASHIBA TOSHIFUMI (JP)
MATSUZAKA ERINA (JP)
YAMADA GOKI (JP)

Application Number:

PCT/JP2016/063545

Publication Date:

November 17, 2016

Filing Date:

May 02, 2016

Export Citation:

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Assignee:

NISSHINBO HOLDINGS INC (JP)

International Classes:

C08F2/06; A61K8/02; A61K8/81; A61Q1/12; C09D11/10; C09D125/04; C09D129/00; C09D133/04; C09D157/00; C09J125/04; C09J129/00; C09J133/04; C09J157/00

Foreign References:

JP2015093973A	2015-05-18
JP2007070372A	2007-03-22
JP2010100689A	2010-05-06
JP2009235353A	2009-10-15
JP2013131368A	2013-07-04

Other References: