Modified polytetrafluoroethylene fine powder and method for the production of the same
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-214/26
C08F-216/12
출원번호
US-0242272
(1999-03-12)
우선권정보
JP-0212341 (1996-08-12)
국제출원번호
PCT/JP97/02742
(1997-08-07)
국제공개번호
WO98/06762
(1998-02-19)
발명자
/ 주소
Hosokawa, Kazutaka
Nanba, Yoshinori
Aoyama, Takahisa
Shimizu, Tetsuo
출원인 / 주소
Daikin Industries Ltd.
대리인 / 주소
Birch, Stewart, Kolasch & Birch, LLP
인용정보
피인용 횟수 :
5인용 특허 :
2
초록▼
A modified polytetrafluoroethylene fine powder containing agglomerates of colloidal particles with an average particle size of from 0.05 to 0.5 μm which comprise a copolymer of tetrafluoroethylene and an olefin-monomer represented by X(CF2)nOCF=CF2in which X is a hydrogen atom, a fluorine atom or a
A modified polytetrafluoroethylene fine powder containing agglomerates of colloidal particles with an average particle size of from 0.05 to 0.5 μm which comprise a copolymer of tetrafluoroethylene and an olefin-monomer represented by X(CF2)nOCF=CF2in which X is a hydrogen atom, a fluorine atom or a chlorine atom, and n is an integer of 1 to 6, and/or C3F7(OCF2CF2CF2)m[OCF(CF3)CF2]pOCF=CF2in which m and p are independently an integer of 0 to 4, provided that the sum of m and p is not 0 (zero), a content of the olefin monomer being from 0.02 to 0.3 wt. %, wherein the copolymer has a molecular weight distribution Mw/Mn of from 1.5 to 4.5 and a standard specific gravity of from 2.135 to 2.175. This modified polytetrafluoroethylene has good paste extrudability, and provides molded articles having good mechanical properties, in particular, pressure resistance.
대표청구항▼
1. A modified polytetrafluoroethylene fine powder comprising agglomerates of colloidal particles with an average particle size of from 0.05 to 0.5 μm which comprise a copolymer of tetrafluoroethylene and at least one olefin monomer selected from the group consisting of a fluoroalkyl vinyl ether of t
1. A modified polytetrafluoroethylene fine powder comprising agglomerates of colloidal particles with an average particle size of from 0.05 to 0.5 μm which comprise a copolymer of tetrafluoroethylene and at least one olefin monomer selected from the group consisting of a fluoroalkyl vinyl ether of the general formula: X(CF2)nOCF=CF2 wherein X is a hydrogen atom, a fluorine atom or a chlorine atom, and n is an integer of 1 to 6, and a fluoroalkyl vinyl ether of the general formula: C3F7(OCF2CF2CF2)m[OCF(CF3)CF2]pOCF=CF2 wherein m and p are independently an integer of 0 to 4, provided that the sum of m and p is not 0 (zero), a content of said olefin monomer being from 0.02 to 0.3 wt. %, wherein said copolymer has a molecular weight distribution Mw/Mn of from 1.5 to 4.5 and a standard specific gravity of from 2.135 to 2.175. 2. A modified polytetrafluoroethylene fine powder according to claim 1, wherein said molecular weight distribution Mw/Mn is from 2.0 to 4.0. 3. A modified polytetrafluoroethylene fine powder according to claim 1, wherein said standard specific gravity is from 2.140 to 2.160. 4. A modified polytetrafluoroethylene fine powder according to claim 1, wherein said fluoroalkyl vinyl ether is a compound of the general formula: X(CF2)nOCF=CF2 wherein X is a hydrogen atom, a fluorine atom or a chlorine atom, and n is an integer of 1 to 6. 5. A method for preparing a modified polytetrafluoroethylene fine powder as claimed in claim 1 comprising copolymerizing tetrafluoroethylene and at least one olefin monomer selected from the group consisting of a fluoroalkyl vinyl ether of the general formula: X(CF2)nOCF=CF2 wherein X is a hydrogen atom, a fluorine atom or a chlorine atom, and n is an integer of 1 to 6, and a fluoroalkyl vinyl ether of the general formula: C3F7(OCF2CF2CF2)m[OCF(CF3)CF2]pOCF=CF2 wherein m and p are independently an integer of 0 to 4, provided that the sum of m and p is not 0 (zero), in an aqueous medium containing 0.02 to 0.3 wt. % of a water-soluble fluorine-containing dispersant, wherein a gaseous chain transfer agent is present in the polymerization system. 6. A method according to claim 5, wherein said chain transfer agent is hydrogen, methane, ethane or propane. 7. A method according to claim 5, wherein a polymerization initiator is ammonium persulfate or an alkali metal persulfate, and a reaction temperature is from 40 to 80° C.
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이 특허에 인용된 특허 (2)
Shimizu Tetsuo (Ibaraki JPX) Hosokawa Kazutaka (Settsu JPX) Kokumai Masuo (Itami JPX) Ono Makoto (Osaka JPX), Modified polytetrafluoroethylene fine powder and process for preparing the same.
Mayer Ludwig (Burghausen DEX) Tonnes Kai-Uwe (Russelsheim DEX) Bladel Hermann (Emmerting DEX), Polytetrafluoroethylene micor powders, their preparation and use.
Shimizu,Tetsuo; Asano,Michio; Ono,Makoto; Nanba,Yoshinori; Kasai,Shunji; Yano,Shinichi; Yoshimoto,Hiroyuki, Polytetrafluoroethylene fine powder of particular specific standard gravity, polytetrafluoroethylene formed article prepared from the same and method for preparation of the same.
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