公开(公告)号：US20210214302A1

公开(公告)日：2021-07-15

申请号：US15999787

申请日：2017-01-16

Applicant: SHOWA DENKO K.K.

Inventor： Naoyuki TANAKA

IPC: C07C231/12 ,  B01J23/42 ,  C07C233/18 ,  B01J21/04 ,  C07C231/24 ,  B01J27/02

Abstract: A method for producing an N-vinylcarboxylic acid amide is provided, the method focusing on unsaturated aldehydes that are contained as impurities generated during a reaction. The method for producing an N-vinylcarboxylic acid amide includes a step for controlling the contained amount of unsaturated aldehydes in the N-vinylcarboxylic acid amide to be not more than 20 mass ppm.

公开(公告)号：US20190144721A1

公开(公告)日：2019-05-16

申请号：US16306986

申请日：2017-06-05

Applicant: SHOWA DENKO K.K.

Inventor： Naoyuki TANAKA ,  Atsushi SUGAWARA ,  Takeshi KAWAMOTO

IPC: C09J7/38 ,  C08F216/38 ,  C08J3/24

Abstract: A pressure-sensitive adhesive composition contains an acrylic resin (A) and an isocyanatecrosslinking agent (B), in which a content of the isocyanate crosslinking agent (B) with respect to 100 parts by mass of the acrylic resin (A) is 0.05 to 5 parts by mass, and the acrylic resin (A) contains a monomer (a1) having a hydroxyl group in an amount of 20% by mass or more, and N-vinylacetamide (a2) in an amount of 0.5% to 5% by mass as a monomer unit.

公开(公告)号：US20220227697A1

公开(公告)日：2022-07-21

申请号：US17595783

申请日：2020-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Takamitsu KOBAYASHI ,  Naoyuki TANAKA

IPC: C07C231/24 ,  C07C233/05

Abstract: A method for producing a highly polymerizable N-vinyl carboxylic acid amide monomer includes (A) melting a crude N-vinyl carboxylic acid amide monomer comprising 50 to 88 mass% of an N-vinyl carboxylic acid amide monomer by heating, followed by cooling for precipitation, and subjecting precipitated N-vinyl carboxylic acid amide monomer crystals to solid-liquid separation (step (A)), and (B) further dissolving the N-vinyl carboxylic acid amide monomer crystals separated in step (A) in a mixed solvent of acetonitrile and an aliphatic hydrocarbon having 6 to 7 carbon atoms, then performing crystallization, performing solid-liquid separation, and recovering an N-vinyl carboxylic acid amide monomer purified product (step (B)), wherein a mass ratio of acetonitrile/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.01 to 0.5, and a mass ratio of aliphatic hydrocarbon having 6 to 7 carbon atoms/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.5 to 3.0.

公开(公告)号：US20220220064A1

公开(公告)日：2022-07-14

申请号：US17595786

申请日：2020-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Takamitsu KOBAYASHI ,  Naoyuki TANAKA

IPC: C07C231/24 ,  C07C233/05

Abstract: A method for producing a highly polymerizable N-vinyl carboxylic acid amide monomer includes (A) melting a crude N-vinyl carboxylic acid amide monomer comprising 50 to 88 mass % of an N-vinyl carboxylic acid amide monomer by heating, followed by cooling for precipitation, and subjecting precipitated N-vinyl carboxylic acid amide monomer crystals to solid-liquid separation (step (A)), and (B) further dissolving the N-vinyl carboxylic acid amide monomer crystals separated in step (A) in a mixed solvent of toluene and an aliphatic hydrocarbon having 6 to 7 carbon atoms, then performing crystallization, performing solid-liquid separation, and recovering an N-vinyl carboxylic acid amide monomer purified product (step (B)), wherein a mass ratio of toluene/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.01 to 0.5, and a mass ratio of aliphatic hydrocarbon having 6 to 7 carbon atoms/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.5 to 3.0.

公开(公告)号：US20220251026A1

公开(公告)日：2022-08-11

申请号：US17614143

申请日：2020-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Takamitsu KOBAYASHI ,  Naoyuki TANAKA

IPC: C07C231/24

Abstract: A method for producing a highly polymerizable N-vinyl carboxylic acid amide monomer includes (A) melting a crude N-vinyl carboxylic acid amide monomer including 50 to 88 mass % of an N-vinyl carboxylic acid amide monomer by heating, followed by cooling for precipitation, and subjecting precipitated N-vinyl carboxylic acid amide monomer crystals to solid-liquid separation (step (A)), and (B) further dissolving the N-vinyl carboxylic acid amide monomer crystals separated in step (A) in a mixed solvent of 1,2-dimethoxyethane and an aliphatic hydrocarbon having 6 to 7 carbon atoms, then performing crystallization, performing solid-liquid separation, and recovering an N-vinyl carboxylic acid amide monomer purified product (step (B)), wherein a mass ratio of 1,2-dimethoxyethane/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.01 to 0.5, and a mass ratio of aliphatic hydrocarbon having 6 to 7 carbon atoms/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.5 to 3.0.

公开(公告)号：US20220220063A1

公开(公告)日：2022-07-14

申请号：US17595785

申请日：2020-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Takamitsu KOBAYASHI ,  Naoyuki TANAKA

IPC: C07C231/24 ,  C07C233/05

Abstract: A method for producing a highly polymerizable N-vinyl carboxylic acid amide monomer includes (A) melting a crude N-vinyl carboxylic acid amide monomer including 50 to 88 mass % of an N-vinyl carboxylic acid amide monomer by heating, followed by cooling for precipitation, and subjecting precipitated N-vinyl carboxylic acid amide monomer crystals to solid-liquid separation, and (B) further dissolving the N-vinyl carboxylic acid amide monomer crystals separated in step (A) in a mixed solvent of methyl ethyl ketone and an aliphatic hydrocarbon having 6 to 7 carbon atoms, then performing crystallization, performing solid-liquid separation, and recovering an N-vinyl carboxylic acid amide monomer purified product, wherein a mass ratio of methyl ethyl ketone/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.01 to 0.5, and a mass ratio of aliphatic hydrocarbon having 6 to 7 carbon atoms/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.5 to 3.0.

公开(公告)号：US20220213025A1

公开(公告)日：2022-07-07

申请号：US17614153

申请日：2020-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Naoyuki TANAKA ,  Katsumi MIKAMI ,  Takamitsu KOBAYASHI

IPC: C07C231/12 ,  C07C231/24

Abstract: A method for producing a highly polymerizable N-vinyl carboxylic acid amide monomer includes (A) melting a crude N-vinyl carboxylic acid amide monomer comprising 50 to 88 mass % of an N-vinyl carboxylic acid amide monomer by heating, followed by cooling for precipitation, and subjecting precipitated N-vinyl carboxylic acid amide monomer crystals to solid-liquid separation (step (A)), and (B) further dissolving the N-vinyl carboxylic acid amide monomer crystals separated in the step (A) in a mixed solvent of ethyl acetate and an aliphatic hydrocarbon having 6 to 7 carbon atoms, then performing crystallization, performing solid-liquid separation, and recovering an N-vinyl carboxylic acid amide monomer purified product (step (B)), wherein a mass ratio of ethyl acetate/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.01 to 0.5, and a mass ratio of aliphatic hydrocarbon having 6 to 7 carbon atoms/N-vinyl carboxylic acid amide monomer crystal in step (B) is 0.5 to 3.0.

公开(公告)号：US20220112155A1

公开(公告)日：2022-04-14

申请号：US17417599

申请日：2019-12-23

Applicant: SHOWA DENKO K.K.

Inventor： Takamitsu KOBAYASHI ,  Naoyuki TANAKA

IPC: C07C231/12

Abstract: The present invention relates to a composition for producing an N-vinylcarboxylic acid amide, the composition including (A) an N-(1-alkoxyethyl)carboxylic acid amide and (B) a carboxylic acid amide other than the N-(1-alkoxyethyl)carboxylic acid amide and the N-vinylcarboxylic acid amide, and satisfying the following conditions (1) to (4): (1) the composition has a melting point of 0 to 30° C.; (2) a water content is 0 to 1.00% by mass in a total amount of the composition; (3) a content ratio of the component (A) to the component (B) is 4.0 to 20.0 in terms of a molar ratio; and (4) a 5% by mass aqueous solution of the composition has a pH of 4.0 to 8.0. The present invention also relates to a method for producing an N-vinylcarboxylic acid amide, the method including thermally decomposing or catalytically decomposing the composition for producing an N-vinylcarboxylic acid amide.