公开(公告)号：US11884755B2

公开(公告)日：2024-01-30

申请号：US16819749

申请日：2020-03-16

Applicant: AGC Inc.

Inventor： Shinya Higuchi ,  Shiro Ebata ,  Takehiro Kose

IPC: C08F14/26 ,  B29C48/00 ,  C08F214/26 ,  C08J5/18 ,  B29K27/18

CPC classification number: C08F14/26 ,  B29C48/0018 ,  B29C48/022 ,  C08F214/265 ,  C08J5/18 ,  B29K2027/18 ,  C08J2327/22 ,  C08F214/26 ,  C08F220/06 ,  C08F214/26 ,  C08F220/1804 ,  C08F214/26 ,  C08F218/08

Abstract: To provide a modified polytetrafluoroethylene excellent in breaking strength. The modified polytetrafluoroethylene comprises a polymer having units based on tetrafluoroethylene and a polymer having units based on a monomer represented by formula (1), wherein the content of the units based on a monomer represented by formula (1) is from 10 to 500 mass ppm, to all units in the modified polytetrafluoroethylene, and the standard specific gravity is from 2.155 to 2.175,

CH2═CR1-L-R2  Formula (1):

wherein R1 represents a hydrogen atom or an alkyl group, L represents a single bond, —CO—O—*, —O—CO—*, or —O—, * represents a bonding position to R2, and R2 represents a hydrogen atom, an alkyl group, or a nitrile group.

公开(公告)号：US11780943B2

公开(公告)日：2023-10-10

申请号：US17021129

申请日：2020-09-15

Applicant: AGC Inc.

Inventor： Shinya Higuchi ,  Shiro Ebata ,  Takehiro Kose

IPC: C08F214/26 ,  C08F2/10 ,  C08J3/16

CPC classification number: C08F214/265 ,  C08F2/10 ,  C08J3/16 ,  C08J2327/22

Abstract: To provide a method for producing modified polytetrafluoroethylene, in which formation of a fluorinated oligomer as a by-product is little. A method for producing modified polytetrafluoroethylene which contains substantially no C6-34 fluorinated oligomer containing hydrophilic functional groups and which contains substantially no fluorinated surfactant, the method comprising conducting copolymerization of tetrafluoroethylene and a monomer having a polar group, in a liquid dispersion 1 comprising a polymer containing units derived from a non-fluorinated monomer and an aqueous medium, or in a solution 2 obtainable by mixing at least one member selected from the group consisting of a polyalkylene oxide compound and a hydrocarbon-containing surfactant, with an oxidizing agent, in an aqueous medium, under such a condition that the amount of the monomer having a polar group to be used, is at most 0.150 mass % to the whole amount of tetrafluoroethylene, to obtain modified polytetrafluoroethylene.

公开(公告)号：US11981762B2

公开(公告)日：2024-05-14

申请号：US16820839

申请日：2020-03-17

Applicant: AGC Inc.

Inventor： Shinya Higuchi ,  Shiro Ebata ,  Takehiro Kose

IPC: C08F214/26 ,  B29C48/00 ,  C08J9/22 ,  B29K27/18

CPC classification number: C08F214/265 ,  B29C48/0018 ,  B29C48/022 ,  C08J9/22 ,  B29K2027/18 ,  C08J2201/034 ,  C08J2327/22

Abstract: To provide a modified PTFE excellent in heat resistance. The modified polytetrafluoroethylene comprises a polymer having units based on tetrafluoroethylene and a polymer having units based on a fluorine-free monomer, wherein the endothermic amount ratio R calculated by a prescribed method is at least 0.65.

公开(公告)号：US11512151B2

公开(公告)日：2022-11-29

申请号：US16814106

申请日：2020-03-10

Applicant: AGC Inc.

Inventor： Shinya Higuchi ,  Shiro Ebata ,  Takehiro Kose

IPC: C08F2/16 ,  C08F214/26 ,  C08J3/16 ,  C08F265/04

Abstract: A method for producing a modified polytetrafluoroethylene, the method including: polymerizing tetrafluoroethylene in an aqueous medium in which a polymer having units based on a fluorine-free monomer is present. The fluorine-free monomer is a monomer represented by formula (1): CH2═CR1-L-R2, where R1 is a hydrogen atom or an alkyl group, L is a single bond, —CO—O—*, —O—CO—* or —O—, * is a bonding position to R2, and R2 is an alkyl group. To the total amount of tetrafluoroethylene supplied to the polymerization, a proportion of the polymer is from 0.001 to 0.050 mass %.

公开(公告)号：US20210009732A1

公开(公告)日：2021-01-14

申请号：US17021129

申请日：2020-09-15

Applicant: AGC Inc.

Inventor： Shinya Higuchi ,  Shiro Ebata ,  Takehiro Kose

IPC: C08F214/26 ,  C08F2/10 ,  C08J3/16

Abstract: To provide a method for producing modified polytetrafluoroethylene, in which formation of a fluorinated oligomer as a by-product is little. A method for producing modified polytetrafluoroethylene which contains substantially no C6-34 fluorinated oligomer containing hydrophilic functional groups and which contains substantially no fluorinated surfactant, the method comprising conducting copolymerization of tetrafluoroethylene and a monomer having a polar group, in a liquid dispersion 1 comprising a polymer containing units derived from a non-fluorinated monomer and an aqueous medium, or in a solution 2 obtainable by mixing at least one member selected from the group consisting of a polyalkylene oxide compound and a hydrocarbon-containing surfactant, with an oxidizing agent, in an aqueous medium, under such a condition that the amount of the monomer having a polar group to be used, is at most 0.150 mass % to the whole amount of tetrafluoroethylene, to obtain modified polytetrafluoroethylene.

公开(公告)号：US11421058B2

公开(公告)日：2022-08-23

申请号：US16684637

申请日：2019-11-15

Applicant: AGC Inc.

Inventor： Shinya Higuchi ,  Masahiro Takazawa ,  Takehiro Kose

IPC: C08F214/18 ,  H01B3/44 ,  C08F214/26 ,  H01B7/02

Abstract: A modified polytetrafluoroethylene which can be formed under a low extrusion pressure and with which changes of the extrusion pressure are suppressed, even in paste extrusion at a high RR ratio, and its production method. The modified polytetrafluoroethylene having units based on tetrafluoroethylene, 0.020 to 0.040 mass % of units based on a monomer represented by the following formula (1), and 0.003 to 0.080 mass % of units based on a monomer represented by the following formula (2), each based on all units of the modified polytetrafluoroethylene. The monomers of formulae (1) and (2) are represented by: CH2═CH—CnF2n+1 (1), wherein n is from 2 to 6; and CF2═CFO(LO)mRf (2), wherein L is a perfluoroalkylene group, Rf is a perfluoroalkyl group, and m is an integer of from 0 to 4.

公开(公告)号：US20200095353A1

公开(公告)日：2020-03-26

申请号：US16684637

申请日：2019-11-15

Applicant: AGC Inc.

Inventor： Shinya Higuchi ,  Masahiro Takazawa ,  Takehiro Kose

IPC: C08F214/18 ,  H01B3/44 ,  H01B7/02

Abstract: To provide a modified PTFE which can be formed under a low extrusion pressure and with which changes of the extrusion pressure are suppressed, even in paste extrusion at a high RR ratio, and its production method.A modified polytetrafluoroethylene having units based on tetrafluoroethylene, units based on a monomer represented by the following formula (1) and units based on a monomer represented by the following formula (2),wherein the content of the units based on the monomer represented by the formula (1) is from 0.020 to 0.040 mass % to all units of the modified polytetrafluoroethylene, andthe content of the units based on the monomer represented by the formula (2) is from 0.003 to 0.080 mass % to all units of the modified polytetrafluoroethylene: CH2═CH—CnF2n+1  (1) wherein n is from 2 to 6; CF2═CFO(LO)mRf  (2) wherein L is a perfluoroalkylene group, Rf is a perfluoroalkyl group, and m is an integer of from 0 to 4.