公开(公告)号：US20220010097A1

公开(公告)日：2022-01-13

申请号：US17291367

申请日：2019-11-06

Applicant: DENKA COMPANY LIMITED

Inventor： Suguru ONUKI ,  Wataru NISHINO ,  Atsunori KONDO ,  Yuhei ISHIGAKI ,  Naoki KOBAYASHI

IPC: C08K5/38 ,  C08F236/12

Abstract: A chloroprene-unsaturated nitrile copolymer composition containing 100 parts by mass of a chloroprene-unsaturated nitrile copolymer having 3 to 20% by mass of a structural unit derived from an unsaturated nitrile monomer, and 0.05 to 2.0 parts by mass of a xanthogen compound.

公开(公告)号：US20210395422A1

公开(公告)日：2021-12-23

申请号：US17291347

申请日：2019-11-06

Applicant: DENKA COMPANY LIMITED

Inventor： Wataru NISHINO ,  Suguru ONUKI ,  Atsunori KONDO ,  Yuhei ISHIGAKI ,  Naoki KOBAYASHI

IPC: C08F236/18 ,  C08F220/44

Abstract: A chloroprene-unsaturated nitrile copolymer having 3 to 20% by mass of a structural unit derived from an unsaturated nitrile monomer, in which the chloroprene-unsaturated nitrile copolymer has a peak at 5.80 to 6.00 ppm in a 1H-NMR spectrum as measured in a deuterochloroform solvent, and a ratio (A/B) of a peak area (A) at 5.80 to 6.00 ppm and a peak area (B) at 4.05 to 6.20 ppm is 0.6/100 to 1.1/100.

公开(公告)号：US20240309197A1

公开(公告)日：2024-09-19

申请号：US18277869

申请日：2022-03-23

Applicant: DENKA COMPANY LIMITED

Inventor： Gaito KIYOFUJI ,  Seiya TOMIZAWA ,  Naoki KOBAYASHI

IPC: C08L47/00

CPC classification number: C08L47/00 ,  C08L2201/52

Abstract: A method for producing a chloroprene-based polymer composition including a polymerization step, wherein chloroprene, or chloroprene and a monomer copolymerizable with chloroprene are polymerized; and includes monomer and emulsifier addition steps, when a total amount of monomer used in the polymerization step is 100%, an initial addition amount of monomer at start of polymerization is X %; in the monomer addition step, when the initial addition amount of the monomer is 100%, a remaining monomer is added to the polymerization system from time when polymerization progresses and Y % of the monomer initially added converts, by reaching the polymerization completion conversion; in the emulsifier addition step, when the total amount of monomer used in the polymerization step is 100%, emulsifier is added from time when polymerization progresses and Z % of the monomer converts by reaching the polymerization completion conversion; and X, Y and Z satisfy following relationship, 1

公开(公告)号：US20230074040A1

公开(公告)日：2023-03-09

申请号：US17788994

申请日：2021-03-22

Applicant: DENKA COMPANY LIMITED

Inventor： Hideharu MORI ,  Wataru NISHINO ,  Yushi KUMAGAI ,  Yutaka SAITO ,  Naoki KOBAYASHI

IPC: C08F293/00 ,  C08K5/06

Abstract: A chloroprene-based block copolymer, a latex, a latex composition, and a rubber composition that can produce a product with excellent tensile properties and flexibility without the use of a vulcanizing agent or a vulcanizing accelerator having a chloroprene-based block copolymer, contains 5 to 30% by mass of a polymer block (A) and 70 to 95% by mass of a chloroprene-based polymer block (B), wherein the polymer block (A) is derived from a monomer, when the monomer is polymerized alone, a polymer with a glass transition temperature of 80° C. or higher can be obtained and the chloroprene-based polymer block (B) includes a chloroprene monomer unit and a polyfunctional monomer unit.

公开(公告)号：US20230055361A1

公开(公告)日：2023-02-23

申请号：US17788958

申请日：2021-03-22

Applicant: DENKA COMPANY LIMITED

Inventor： Yushi KUMAGAI ,  Wataru NISHINO ,  Yutaka SAITO ,  Naoki KOBAYASHI

IPC: C08F293/00 ,  C08K5/01

Abstract: A chloroprene-based block copolymer, a latex, a latex composition, and a rubber composition that can produce a product with excellent flexibility and tensile properties without the use of a vulcanizing agent or a vulcanizing accelerator. A chloroprene-based block copolymer, includes 5 to 30% by mass of a polymer block (A) and 70 to 95% by mass of a chloroprene-based polymer block (B), wherein: the polymer block (A) is derived from a monomer; when the monomer is polymerized alone, a polymer with a glass transition temperature of 80° C. or higher can be obtained; the chloroprene-based polymer block (B) includes a chloroprene monomer; and the chloroprene-based block copolymer has a toluene insoluble content of 20 to 100% by mass with respect to 100% by mass of the chloroprene-based block copolymer.

公开(公告)号：US20230050436A1

公开(公告)日：2023-02-16

申请号：US17788950

申请日：2021-03-22

Applicant: DENKA COMPANY LIMITED

Inventor： Yushi KUMAGAI ,  Wataru NISHINO ,  Yutaka SAITO ,  Naoki KOBAYASHI

IPC: C08F293/00

Abstract: A chloroprene-based block copolymer latex, including a chloroprene-based block copolymer, wherein: the chloroprene-based block copolymer contains 5 to 30% by mass of a polymer block (A) and 70 to 95% by mass of a chloroprene-based polymer block (B); the polymer block (A) is derived from a monomer; when the monomer is polymerized alone, a polymer with a glass transition temperature of 80° C. or higher can be obtained; the chloroprene-based polymer block (B) includes a chloroprene monomer unit; and when the chloroprene-based block copolymer latex is molded by immersion molding to obtain a film and then the film is heat-treated at 130° C. for 30 minutes, a tensile strength at break measured in accordance with JIS K6251 of the film is 17 MPa or more is provided.

公开(公告)号：US20230025987A1

公开(公告)日：2023-01-26

申请号：US17788782

申请日：2021-03-22

Applicant: DENKA COMPANY LIMITED

Inventor： Yushi KUMAGAI ,  Wataru NISHINO ,  Yutaka SAITO ,  Naoki KOBAYASHI

IPC: C08F293/00 ,  C08J3/05

Abstract: An immersion-molded body, wherein: the immersion-molded body is obtained using a latex; the latex comprises a chloroprene-based block copolymer; the chloroprene-based block copolymer contains 5 to 30% by mass of a polymer block (A) and 70 to 95% by mass of a chloroprene-based polymer block (B); the polymer block (A) is derived from a monomer; when the monomer is polymerized alone, a polymer with a glass transition temperature of 80° C. or higher can be obtained; the chloroprene-based polymer block (B) includes a chloroprene monomer unit; and when the immersion-molded body is heat-treated at 130° C. for 30 minutes, a tensile strength at break of the heat-treated immersion-molded body measured in accordance with JIS K6251 is 17 MPa or more.

公开(公告)号：US20220396717A1

公开(公告)日：2022-12-15

申请号：US17623502

申请日：2020-08-11

Applicant: DENKA COMPANY LIMITED

Inventor： Manabu MIURA ,  Daisuke YOSHIMURA ,  Naoki KOBAYASHI ,  Atsunori KONDO

IPC: C09J7/21 ,  C09J11/04 ,  C09J11/06

Abstract: An adhesive tape can reduce percussive sounds or friction sounds, can prevent contamination of a covered article due to contamination by dirt or dust or intrusion by water or oil, has durability against puncture or friction, and easily bends after binding a covered article. The adhesive tape having a substrate including 100 parts by mass of a polyvinyl chloride and, with respect to the 100 parts by mass of the polyvinyl chloride, 10-100 parts by mass of an elastomer and 10-100 parts by mass of a plasticizer, wherein the elastomer includes an acrylonitrile monomer unit and at least one monomer unit selected from the group made of a chloroprene monomer unit, a butadiene monomer unit, and an isoprene monomer unit and the adhesive tape has an attenuation value of 2 dB or greater in an acoustic absorption test.

公开(公告)号：US20180327576A1

公开(公告)日：2018-11-15

申请号：US15776029

申请日：2016-11-15

Applicant: DENKA COMPANY LIMITED

Inventor： Naoki KOBAYASHI ,  Yasushi ABE

IPC: C08L11/00 ,  C08L23/16 ,  C08L7/00

CPC classification number: C08L11/00 ,  C08J3/226 ,  C08J2411/00 ,  C08K2003/222 ,  C08K2201/006 ,  C08L7/00 ,  C08L23/04 ,  C08L23/16 ,  C08L2205/03 ,  C08K3/22 ,  C08K5/101 ,  C08K3/04

Abstract: A rubber-based composition modifier includes 100 parts by mass of a mixed rubber component containing a chloroprene rubber and at least one copolymer selected from ethylene/α-olefin copolymers and ethylene/α-olefin/unconjugated polyene copolymers, 10 to 60 parts by mass of magnesium oxide, 3 to 30 parts by mass of a softener, and 30 to 120 parts by mass of acetylene black, wherein the mixed rubber component has a Mooney viscosity, as determined by the method specified in JIS K6300, of 60 to 180 at 100° C.; the magnesium oxide has a BET specific surface area, as determined by the one point method specified in JIS Z8830, of 20 to 150 m2/g; the softener contains a fatty acid ester-based plasticizer and an unsaturated fatty acid having a carbon number of 10 to 24 and containing an ester bond, a hydroxyl group, or both of them in part of the structure.