US5608022A
Expired / Lapsed
US
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Perfluorocarbon copolymer containing functional groups and a method for producing it
Assignee: Asahi Kasei Corp
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Filing: 1994-10-07
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Granted: 1997-03-04
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Expires: 2014-10-07
Abstract
Abstract The present invention provides a method for producing a perfluorocarbon copolymer containing functional groups, which comprises: emulsifying a perfluorocarbon monomer containing a functional group represented by the following general formula (1) into fine dispersions having an average diameter of 2 μm or less in water: CF.sub.2 ═CF--O--(CF.sub.2 CF(CF.sub.3)--O)n--(CF.sub.2)m--Z(1) wherein m is an integer of 2 to 4; Z is CO 2 R (where R represents an alkyl group having 1 to 3 carbon atoms) or SO 2 F; n is 1 or 2 when Z is CO 2 R and n is an integer of 0 to 2 when Z is SO 2 F, adding at least one water-soluble organic chain transfer agent selected from the group consisting of aliphatic alcohols having 1 to 6 carbon atoms and ethers having 2 to 6 carbon atoms and polymerizing the perfluorocarbon monomer (1) containing a functional group with tetrafluoroethylene represented by the following formula (2): CF.sub.2 ═CF.sub.2 (2). It also provides a perfluorocarbon copolymer containing functional groups obtained by this method. According to the production method of the present invention, a perfluorocarbon copolymer containing functional groups, which has good melt moldability and excellent performance, can be produced while the formation of a homopolymer of tetrafluoroethylene in the aqueous phase is inhibited.
Inventors
- 👤 Yoshimichi Nakayama
- 👤 Masaaki Yonezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:12
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262; C08F216/00; C08F216/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
153 words
A method for producing a perfluorocarbon copolymer containing functional groups, which comprises: emulsifying a perfluorocarbon monomer containing a functional group represented by the following general formula (1) into fine dispersions having an average diameter of 2 μm or less in water: CF.sub.2 ═CF--O--(CF.sub.2 CF(CF.sub.3)--O)n--(CF.sub.2)m--Z(1) wherein m is an integer of 2 to 4; Z is CO 2 R (where R represents an alkyl group having 1 to 3 carbon atoms) or SO 2 F; n is 1 or 2 when Z is CO 2 R and n is an integer of 0 to 2 when Z is SO 2 F, adding at least one water-soluble organic chain transfer agent selected from the group consisting of aliphatic alcohols having 1 to 6 carbon atoms and ethers having 2 to 6 carbon atoms and polymerizing the perfluorocarbon monomer (1) containing a functional group with tetrafluoroethylene represented by the following formula (2): CF.sub.2 ═CF.sub.2 ( 2).
Claim 2
Independent Claim
153 words
A method for producing a perfluorocarbon copolymer containing functional groups, which comprises: emulsifying a perfluorocarbon monomer containing a functional group represented by the following general formula (1) into fine dispersions having an average diameter of 2 μm or less in water: CF.sub.2 ═CF--O--(CF.sub.2 CF(CF.sub.3)--O)n--(CF.sub.2)m--Z(1) wherein m is an integer of 2 to 4; Z is CO 2 R (where R represents an alkyl group having 1 to 3 carbon atoms) or SO 2 F; n is 1 or 2 when Z is CO 2 R and n is an integer of 0 to 2 when Z is SO 2 F, adding at least one water-soluble organic chain transfer agent selected from the group consisting of aliphatic alcohols having 1 to 6 carbon atoms and ethers having 2 to 6 carbon atoms and polymerizing the perfluorocarbon monomer (1) containing a functional group with tetrafluoroethylene represented by the following formula (2): CF.sub.2 ═CF.sub.2 ( 2).
Claim 3
Dependent Claim
53 words
The method for producing a perfluorocarbon copolymer containing functional groups according to claim 1, further comprising: reducing the reaction pressure of tetrafluoroethylene in accordance with the increase in a conversion of the monomer (1) containing a functional group to prevent an equivalent weight of the produced perfluorocarbon copolymer containing functional groups from changing.
Claim 4
Dependent Claim
41 words
The method for producing a perfluorocarbon copolymer containing functional groups according to claim 1 or 2, wherein the perfluorocarbon monomer (1) containing a functional group is emulsified into fine dispersions having an average diameter of 1 μm or less in water.
Claim 5
Dependent Claim
33 words
The method for producing a perfluorocarbon copolymer containing functional groups according to claim 1 or 2, wherein the water-soluble organic chain transfer agent is an aliphatic alcohol having 1 to 6 carbon atoms.
Claim 6
Dependent Claim
25 words
The method for a producing perfluorocarbon copolymer containing functional groups according to claim 1 or 2, wherein the water-soluble organic chain transfer agent is methanol.
Claim 7
Dependent Claim
38 words
The method for producing a perfluorocarbon copolymer containing functional groups according to claim 1 or 2, wherein the water-soluble organic chain transfer agent is a combination of an aliphatic alcohol having 2 to 6 carbon atoms and methanol.
Claim 8
Dependent Claim
41 words
The method for a producing perfluorocarbon copolymer containing functional groups according to claim 1 or 2, wherein the perfluorocarbon monomer (1) containing a functional group is CF 2 ═CF--O--CF 2 CF(CF 3 )--O--(CF 2 ) 2 --CO 2 CH 3 .
Claim 9
Dependent Claim
39 words
The method for producing a perfluorocarbon copolymer containing functional groups according to claim 1 or 2, wherein the perfluorocarbon monomer (1) containing a functional group is CF 2 ═CF--O--CF 2 CF(CF 3 )--O--(CF 2 ) 2 --SO 2 F.
Claim 10
Independent Claim
173 words
A method, which comprises: emulsifying an aqueous composition that contains a perfluorocarbon monomer, having a functional group, of formula (1) to obtain a fine dispersion of said perfluorocarbon monomer having an average particle size of 2 μm or less: CF.sub.2 ═CF--O--(CF.sub.2 CF.sub.2 (CF.sub.3) --O).sub.n --(CF.sub.2).sub.m --Z wherein m is an integer of 2 to 4; Z is SO 2 F or CO 2 R, wherein R is an alkyl group having 1 to 3 carbon atoms; n is 1 or 2 when Z is CO 2 R and n is an integer of 0 to 2 when Z is SO 2 F; and copolymerizing said emulsified perfluorocarbon monomer with gaseous tetrafluoroethylene in the presence of a water-soluble organic; chain transfer agent selected from the group consisting of aliphatic alcohols having 1 to 6 carbon atoms and ethers having 2 to 6 carbon atoms, under pressure of from 1 to 200 kg/cm 2 at a temperature in the range of 20° C. to 90° C. to thereby produce a perfluorocarbon copolymer containing functional groups.
Claim 11
Independent Claim
173 words
A method, which comprises: emulsifying an aqueous composition that contains a perfluorocarbon monomer, having a functional group, of formula (1) to obtain a fine dispersion of said perfluorocarbon monomer having an average particle size of 2 μm or less: CF.sub.2 ═CF--O--(CF.sub.2 CF.sub.2 (CF.sub.3) --O).sub.n --(CF.sub.2).sub.m --Z wherein m is an integer of 2 to 4; Z is SO 2 F or CO 2 R, wherein R is an alkyl group having 1 to 3 carbon atoms; n is 1 or 2 when Z is CO 2 R and n is an integer of 0 to 2 when Z is SO 2 F; and copolymerizing said emulsified perfluorocarbon monomer with gaseous tetrafluoroethylene in the presence of a water-soluble organic; chain transfer agent selected from the group consisting of aliphatic alcohols having 1 to 6 carbon atoms and ethers having 2 to 6 carbon atoms, under pressure of from 1 to 200 kg/cm 2 at a temperature in the range of 20° C. to 90° C. to thereby produce a perfluorocarbon copolymer containing functional groups.
Claim 12
Dependent Claim
26 words
The method according to claim 9, wherein said water-soluble organic chain transfer agent is added to said emulsified perfluorocarbon monomer containing composition prior to said copolymerization.
Claim 13
Dependent Claim
31 words
The method according to claim 9, wherein said water-soluble organic chain transfer agent is contained in an amount of from 0.01 to 20% by weight based on the amount of water.
Claim 14
Dependent Claim
32 words
The method according to claim 10, wherein said aqueous composition further comprises a dispersing agent selected from the group consisting of potassium, sodium, or ammonium perfluorosulfonates and potassium, sodium, or ammonium perfluorocarboxylates.
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