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Title:
PROCESSES FOR PRODUCING (METH)ACRYLIC POLYMER AND MULTILAYERED (METH)ACRYLIC POLYMER
Document Type and Number:
WIPO Patent Application WO/2016/189865
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a process for producing either a (meth)acrylic polymer or a multilayered (meth)acrylic polymer, the process making it possible to reduce the formation of micrometer-size particles having a size of from several micrometers to several tens of micrometers during the polymerization for producing the (meth)acrylic polymer or multilayered (meth)acrylic polymer. Even when a filter is used during the production, the life of the filter medium can be prolonged. The process for producing a (meth)acrylic polymer includes the step of supplying, to a reactor, an emulsion comprising a monomer mixture, water, and a surfactant and polymerizing the monomer mixture. In the process, the emulsion in which the ratio of the weight of the surfactant (EM-1) to the weight of the monomer mixture (A-1), [weight of (EM-1)]/[weight of (A-1)], is less than 7.0×10-3 and which has an emulsified-droplet diameter of 0.5 µm or larger but smaller than 20 µm is supplied to the reactor to conduct the polymerization. The (meth)acrylic polymer has a particle diameter of 50-300 nm.

Inventors:
YAMADA HIROTSUGU
MAIZURU NOBUYOSHI
IKEDA YOSHIHIRO
KITAYAMA FUMINOBU
Application Number:
PCT/JP2016/002532
Publication Date:
December 01, 2016
Filing Date:
May 25, 2016
Export Citation:
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Assignee:
KANEKA CORP (JP)
International Classes:
C08F2/22; C08F265/06
Domestic Patent References:
WO2014038679A12014-03-13
WO2001048026A12001-07-05
Foreign References:
JP2009286907A2009-12-10
JP2007277529A2007-10-25
JP2001261713A2001-09-26
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
Patent business corporation Owner old patent firm (JP)
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