EP0030115A2
Expired / Lapsed
EP
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Process for producing modified polytetrafluoroethylene
Assignee: AGC Inc
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Filing: 1980-11-25
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Granted: —
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Expires: 2000-11-25
Abstract
Abstract A modified polytetrafluoroethylene is produced by polymerizing tetrafluoroethylene in an aqueous medium containing a dispersing agent with a polymerization initiator source and then, copolymerizing tetrafluoroethylene and a fluorinated monomer having an acid type functional group as a copolymerizable modifier in the presence of the resulting polytetrafluoroethylene to obtain a modified polytetrafluoroethylene having the modifier component of 0.001 to 10 mol %.
Inventors
- 👤 Haruhisa Miyake
- 👤 Masami Yamashita
- 👤 Tatsuro Asawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:23
CPC Classifications
C; C08; C08F; C08F259/00; C08F259/08; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
1) A process for producing a modified polytetrafluoroethylene which comprises polymerizing tetrafluoroethylene in an aqueous medium containing a dispersing agent with a polymerization initiator source and then, copolymerizing tetrafluoroethylene and a fluorinated monomer having an acid type functional group as a copolymerizable modifier in the presence of the resulting polytetrafluoroethylene to obtain a modified polytetrafluoroethylene having the modifier component of 0.001 to 10 mol %.
Claim 2
Dependent Claim
65 words
1) A process for producing a modified polytetrafluoroethylene which comprises polymerizing tetrafluoroethylene in an aqueous medium containing a dispersing agent with a polymerization initiator source and then, copolymerizing tetrafluoroethylene and a fluorinated monomer having an acid type functional group as a copolymerizable modifier in the presence of the resulting polytetrafluoroethylene to obtain a modified polytetrafluoroethylene having the modifier component of 0.001 to 10 mol %.
Claim 3
Dependent Claim
28 words
2) The process according to Claim 1 wherein said modifier component is present in each sheath layer corresponding to upto 30% of the total weight of the particles.
Claim 4
Dependent Claim
35 words
3) The process according to Claim 1 or 2 wherein said copolymerizable modifier is fed into the polymerization system to copolymerize with tetrafluoroethylene after polymerizing at least 70% of the total weight of tetrafluoroethylene polymerized.
Claim 5
Dependent Claim
130 words
4) The process according to Claim 1, 2 or 3 wherein said copolymerizable modifier is a fluorovinyl compound having the formula wherein p is 0 or 1; ℓ is 0 to 3; m is 0 to 1; n is 0 to 12; X represents -F, -Cℓ or -CF 3 ; X' represents -F or -CF 3 ; Y and Y' respectively represent -F or a C 1-10 perfluoroalkyl group; A represents -CN, -COF, -COOH, -COOR 1 , -COOM or -COONR 2 R 3 , -SO 2 F, -SO 3 M, -SO 3 H, R 1 represents a C 1-10 alkyl group; R 2 and R 3 respectively represent -H or R 1 ; R 4 represents R 1 ; M represents an alkali metal atom or a quaternary ammonium group.
References Cited (Backward Citations)
No citation records indexed.
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