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Title:
PRODUCTION OF CORE-HAVING MULTI-LAYERED STRUCTURE EMULSION PARTICLE
Document Type and Number:
Japanese Patent JP3313150
Kind Code:
B2
Abstract:

PURPOSE: To obtain the subject particle having layers having mutually prescribed different refractive indexes, reduced in its smell, excellent in its opacity and luster, and useful as an organic pigment for coating paper, etc., by forming outer layers on a specific core particle under a specific condition, and subsequently swelling the particles.
CONSTITUTION: (B) Vinylic monomers containing 5-80wt.% of an acidic functional vinylic monomer is added in a weight of 1-10 times that of a component A and polymerized in the presence of (A) the core particles to form an outer layer. Further, (C) a vinylic monomer not containing the acidic functional vinylic monomer is added and polymerized in the presence of 0.1-10wt.% of a nonionic surfactant to form the outermost layer. The produced particles are mixed with an inorganic basic substance to neutralize and swell a carboxylic acid in the particles, and subsequently dried to provide the objective particles having particle diameters of 0.3-5.0μm and having the layers having mutually different refractive indexes. The core particles A comprise a polymer which is produced by emulsion-polymerizing vinylic monomers containing 50-99wt.% of an aromatic vinylic monomer and 1-10wt.% of a crosslinking vinylic monomer and which has a refractive index of ≥1.50.


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Inventors:
Futoshi Hoshino
Akihiro Yamazaki
Kousuke Someya
Takashi Yanagihara
Application Number:
JP23004092A
Publication Date:
August 12, 2002
Filing Date:
August 28, 1992
Export Citation:
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Assignee:
Mitsui Chemicals, Inc.
International Classes:
C08F257/02; C08F2/22; C08F2/44; C08F8/44; C08F257/00; C08F265/00; C08F265/02; C08F285/00; (IPC1-7): C08F2/44; C08F2/22; C08F8/44; C08F257/02; C08F265/02; C08F285/00
Domestic Patent References:
JP673138A
JP5170831A
JP532740A
JP4211411A
JP6448805A
JP137401B2
JP7501836A



 
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