Production method for polyvinylidene fluoride aqueous dispersion liquid, and polyvinylidene fluoride aqueous dispersion liquid

Patent metadata

Field	Value
Publication number	US-10150820-B2
Application number	US-201414758034-A
Country	US
Kind code	B2
Filing date	Jan 6, 2014
Priority date	Dec 28, 2012
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

The present invention aims to provide a production method that can produce an aqueous dispersion containing polyvinylidene fluoride with high productivity. The present invention relates to a method of producing an aqueous dispersion of polyvinylidene fluoride, including: emulsion polymerization of vinylidene fluoride in the presence of a surfactant, an organic peroxide, and water to produce an aqueous dispersion that contains polyvinylidene fluoride. The surfactant has a surface tension of 55 mN/m or smaller when added in an amount of 1000 ppm.

First claim

The invention claimed is:

1. A method of producing an aqueous dispersion of polyvinylidene fluoride, the method comprising:
emulsion polymerization of vinylidene fluoride in the presence of a surfactant, an organic peroxide, and water to produce an aqueous dispersion that contains polyvinylidene fluoride,
the surfactant having a surface tension of 21 mN/m or more and 55 mN/m or smaller when added to water in an amount of 1000 ppm,
wherein the organic peroxide is at least one selected from the group consisting of di-t-butylperoxide, di-n-propyl peroxydicarbonate, di-t-hexylperoxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, and t-butyl peroxyisobutyrate,
wherein the surfactant is at least one selected from the group consisting of
the surfactants represented by Formula (1):

wherein R 1 and R 2 independently represent a C1 to C14 alkyl or halogenated alkyl group; at least one of R 1 and R 2 is a C1 to C14 halogenated alkyl group; the alkyl or halogenated alkyl group may contain an oxygen atom between carbon atoms if the alkyl or halogenated alkyl group contains 2 to 14 carbons; R 3 represents H or —(CH 2 ) v —COOM 1 ; R 4 represents —SO 3 M 2 or —(CH 2 ) v —COOM 1 ; v represents an integer of 0 to 3; M 1 and M 2 independently represent H, NR 4 or an alkali metal; and four Rs independently represent H or a C1 to C3 alkyl group,
the surfactants represented by Formula (2):

wherein R 5 and R 6 independently represent a C1 to C14 alkyl or halogenated alkyl group; the alkyl or halogenated alkyl group may contain an oxygen atom between carbon atoms if the alkyl or halogenated alkyl group contains 2 to 14 carbons; two M 1 s independently represent H, NR 4 or an alkali metal; and four Rs independently represent H or a C1 to C3 alkyl group, and
the surfactants represented by Formula (3):

wherein R 7 and R 8 independently represent a C1 to C14 alkyl or halogenated alkyl group; the alkyl or halogenated alkyl group may contain an oxygen atom between carbon atoms if the alkyl or halogenated alkyl group contains 2 to 14 carbons; R 9 represents —SO 3 M 2 or —COOM 1 ; M 1 and M 2 independently represent H, NR 4 , or an alkali metal; four Rs independently represent H or a C1 to C3 alkyl group; and w represents an integer of 0 to 3.

2. The method according to claim 1 ,
wherein vinylidene fluoride alone is emulsion polymerized.

3. The method according to claim 1 ,
wherein the organic peroxide is at least one selected from the group consisting of di-t-butylperoxide, di-t-hexylperoxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, and t-butyl peroxyisobutyrate.

Assignees

• Daikin Ind Ltd

Inventors

• Iida Mayumi
• Nakano Yasuhiro
• Imoto Katsuhiko

Classifications

• C08F14/22

  Vinylidene fluoride · CPC title

• C09D7/63

  organic · CPC title

• C08F2/26 Primary

  anionic · CPC title

• C08K5/17

  Amines; Quaternary ammonium compounds · CPC title

• C08K5/09

  Carboxylic acids; Metal salts thereof; Anhydrides thereof · CPC title