2-cyanoacrylate composition having magnetism

Patent metadata

Field	Value
Publication number	US-10487244-B2
Application number	US-201515518719-A
Country	US
Kind code	B2
Filing date	Sep 24, 2015
Priority date	Oct 15, 2014
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

There is provided a one-pack type room-temperature-curable 2-cyanoacrylate based composition having magnetism. The 2-cyanoacrylate based composition having magnetism is characterized by containing (a) a 2-cyanoacrylic acid ester and (b) a magnetic powder dispersible in the 2-cyanoacrylic acid ester, wherein the content of the magnetic powder (b) is 5 to 500 parts by weight relative to 100 parts by weight of the 2-cyanoacrylic acid ester (a). The magnetic powder (b) is preferably a stainless steel.

First claim

The invention claimed is:

1. A 2-cyanoacrylate based composition having magnetism, comprising
(a) a 2-cyanoacrylic acid ester; and
(b) a magnetic powder dispersible in the 2-cyanoacrylic acid ester,
wherein the content of the magnetic powder (b) is 5 to 500 parts by weight relative to 100 parts by weight of the 2-cyanoacrylic acid ester (a),
wherein the magnetic powder is a stainless steel, wherein the stainless steel has a volume basis median diameter of 1 to 200 μm, and wherein the stainless steel is at least one selected from the group consisting of martensitic stainless steel, ferritic stainless steel, austenite-ferrite two-phase stainless steel and precipitation hardening stainless steel; and
wherein the composition further comprises a fumed silica.

2. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the 2-cyanoacrylate based composition contains 1 to 30 parts by weight of the fumed silica relative to 100 parts by weight of the 2-cyanoacrylic acid ester (a).

3. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the stainless steel has a volume basis median diameter of 10 to 150 μm.

4. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the stainless steel has a volume basis median diameter of 20 to 100 μm.

5. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the stainless steel has a volume basis median diameter of 55 to 75 μm.

6. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the content of the magnetic powder (b) is 7 to 450 parts by weight relative to 100 parts by weight of the 2-cyanoacrylic acid ester (a).

7. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the content of the magnetic powder (b) is 10 to 420 parts by weight relative to 100 parts by weight of the 2-cyanoacrylic acid ester (a).

8. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the fumed silica is a hydrophilic silica having a surface area of 20 to 600 m 2 /g.

9. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the fumed silica is a hydrophilic silica having a surface area selected from the group consisting of 50±15 m 2 /g, 130±25 m 2 /g, 140±20 m 2 /g, 200±25 m 2 /g, 220±20 m 2 /g, 300±30 m 2 /g, and 380±30 m 2 /g.

10. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the fumed silica is a hydrophobic silica having a surface area of 20 to 400 m 2 /g.

11. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the fumed silica is a hydrophobic silica having a surface area selected from the group consisting of 100±20 m 2 /g, 110±20 m 2 /g, 120±10 m 2 /g, 150±20 m 2 /g, 170±20 m 2 /g, 250±25 m 2 /g, and 260±25 m 2 /g.

12. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the 2-cyanoacrylate based composition contains 1 to 25 parts by weight of the fumed silica per 100 parts by weight of 2-cyanoacrylic acid ester a).

13. The 2-cyanoacrylate based composition having magnetism according to claim 1 , wherein the 2-cyanoacrylate based composition contains 2 to 20 parts by weight of the fumed silica per 100 parts by weight of 2-cyanoacrylic acid ester (a).

14. A 2-cyanoacrylate based composition having magnetism, comprising
(a) a 2-cyanoacrylic acid ester;
(b) a magnetic powder dispersible in the 2-cyanoacrylic acid ester,
wherein the content of the magnetic powder (b) is 5 to 500 parts by weight relative to 100 parts by weight of the 2-cyanoacrylic acid ester (a),
wherein the magnetic powder is a stainless steel, wherein the stainless steel has a volume basis median diameter of 1 to 200 μm, and the stainless steel is at least one selected from the group consisting of martensitic stainless steel, ferritic stainless steel, austenite-ferrite two-phase stainless steel and precipitation hardening stainless steel; and
wherein the composition further comprises a fumed silica having a primary particle diameter of 500 nm or less.

15. The 2-cyanoacrylate based composition having magnetism according to claim 14 , wherein the stainless steel has a volume basis median diameter of 61 to 200 μm.

16. The 2-cyanoacrylate based composition having magnetism according to claim 15 , wherein the 2-cyanoacrylate based composition contains 1 to 30 parts by weight of the fumed silica relative to 100 parts by weight of the 2-cyanoacrylic acid ester (a).

Assignees

• Toagosei Co Ltd

Inventors

• Oikawa Hiroshige
• Ando Yushi

Classifications

• C08K3/36

  Silica · CPC title

• C09J9/00 Primary

  Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence) · CPC title

• C09J11/04

  inorganic · CPC title

• C09J4/00

  Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16} · CPC title

• H01F1/0306

  Metals or alloys, e.g. LAVES phase alloys of the MgCu2-type (H01F1/0304 takes precedence) · CPC title