EP0320940A2
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Process for emulsion polymerization
Assignee: Daikin Industries Ltd
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Filing: 1988-12-15
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Granted: —
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Expires: 2008-12-15
Abstract
Abstract A monomer which is hardly soluble in water is effectively emulsion polymerized or copolymerized in the presence of a polymerization initiating source when the polymerization is carried out in the presence of a monovalent cation.
Inventors
- 👤 Shigeru Morita
- 👤 Shinji Tanaka
- 👤 Masahiko Oka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:14
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F16/00; C08F16/12; C08F16/14; C08F16/26
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
36 words
A process for emulsion polymerizing at least one monomer which is hardly soluble in water in the presence of a polymerization initiating source wherein the polymerization is carried out in the presence of a monovalent cation.
Claim 2
Dependent Claim
36 words
A process for emulsion polymerizing at least one monomer which is hardly soluble in water in the presence of a polymerization initiating source wherein the polymerization is carried out in the presence of a monovalent cation.
Claim 3
Dependent Claim
18 words
The process according to claim 1, wherein the polymerization is carried out in the presence of an emulsifier.
Claim 4
Dependent Claim
24 words
The process according to claim 1, wherein the monomer which is hardly soluble in water is copolymerized with at least one of other monomers.
Claim 5
Dependent Claim
16 words
The process according to claim 3, wherein the other monomer is a fluorine-containing ethylenically unsaturated compound.
Claim 6
Dependent Claim
21 words
The process according to claim 1, wherein the monomer which is hardly soluble in water is liquid under the polymerization conditions.
Claim 7
Dependent Claim
96 words
The process according to claim 1, wherein the monomer which is hardly soluble in water is a fluoro(vinyl ether) of the formula: wherein X is independently a hydrogen atom, a fluorine atom or a chlorine atom, R is CF₃ or CH₂Y (in which Y is an iodine atom, a bromine atom or a chlorine atom), m is a number of 0 to 10, n is a number of 0 to 10 and p is a number of 0 to 3 provided that the sum of m and n (m + n) is from 1 to 10.
Claim 8
Dependent Claim
22 words
The process according to claim 1, wherein the monovalent cation is emanated from an inorganic salt with a mono- or di-valent anion.
Claim 9
Dependent Claim
14 words
The process according to claim 7, wherein the monovalent cation is an ammonium ion.
Claim 10
Dependent Claim
13 words
The process according to claim 7, wherein the anion is a chloride ion.
Claim 11
Dependent Claim
21 words
The process according to claim 8, wherein the ammonium ion is used in combination with at least one of other cations.
Claim 12
Dependent Claim
42 words
The process according to claim 7, wherein the amount of the inorganic salt is so selected that a total amount of the cations (including a cation emanated from the emulsifier when it is used) is at least 2.5 x 10⁻¹ gram ion/liter.
Claim 13
Dependent Claim
66 words
The process according to claim 2, wherein the emulsifier is a compound of the formula: R f -[OCFX′CF₂(CF₂) q ] r -CFXCOOM (II) wherein R f is a C₁-C₁₂ perfluoroalkyl group, X′ is a fluorine atom or a trifluoromethyl group, q is 0 or 1, r is a number of 0 to 30 and M is a hydrogen atom, an ammonium group or an alkali metal.
Claim 14
Dependent Claim
96 words
The process according to claim 4, wherein the ethylenically unsaturated compound is a compound of the formula: CZ₂=CZ₂ (III) or CF₂=CFO-(CF₂) p R (IV) wherein R and p are the same as defined above, Z is independently a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom or a trifluoromethyl group provided that at least one Z is the fluorine atom or the trifluoromethyl group, the number of the iodine atom or the bromine atom is zero or one and the number of the trifluoromethyl group is zero, one or two.
Claim 15
Dependent Claim
55 words
The process according to claim 13, wherein the ethylenically unsaturated compound is at least one selected from the group consisting of vinyl fluoride, vinylidene fluoride, tetrafluoroethylene, trifluoroethylene, 1-chloro-2-fluoroethylene, 1-chloro-1-fluoroethylene, chlorotrifluoroethylene, trifluorobromoethylene, trifluoroiodoethylene, hexafluoropropylene, perfluoro(methyl vinyl ether), perfluoro(propyl vinyl ether) and an ethylenically unsaturated compound of the formula: CF₂=CF-O-CF₂Q (V) wherein Q is a halogen atom.
Claim 16
Dependent Claim
20 words
The process according to claim 1, wherein the polymerization is carried out in the presence of a chain transfer agent.
Claim 17
Dependent Claim
15 words
The process according to claim 15, wherein the chain transfer agent is an iodide compound.
Claim 18
Dependent Claim
14 words
The process according to claim 16, wherein the iodide compound is a diiodide compound.
Claim 19
Dependent Claim
21 words
The process according to claim 16, wherein the iodide compound is selected from the group consisting of CF₂I₂, I(CF₂)₄I and CF₂=CFCF₂CF₂I.
Claim 20
Dependent Claim
33 words
The process according to claim 8, wherein the molar ratio of the ammonium ion to the total molar amount of all the monovalent cations in the polymerization system is from 0.4 to 1.
Claim 21
Dependent Claim
20 words
The process according to claim 1, wherein a surface tension of the polymerization medium is at 17 dyne/cm or less.
Claim 22
Dependent Claim
17 words
The process according to claim 1, wherein pH of the polymerization medium is from 6 to 10.
Claim 23
Dependent Claim
11 words
The process according to claim 1, which produces an elastomeric polymer.
References Cited (Backward Citations)
No citation records indexed.
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