Curable composition for hard disk drive

• US 10,059,838 B2
• Filed: 07/18/2013
• Issued: 08/28/2018
• Est. Priority Date: 07/20/2012
• Status: Active Grant

• Current Assignee: Kyoritsu Chemical & Co., Ltd.
• Original Assignee: Kyoritsu Chemical & Co., Ltd.
• Inventors: Hara, Yuta
• Primary Examiner(s): McClendon, Sanza L.
• Application Number:
  US14/415,927
• Publication Number:
  US 20150166784A1
• Time in Patent Office: 1,867 Days
• Field of Search: 522100, 522103
• CPC Class Codes: B32B 2037/1253 curable adhesive
• CPC Class Codes: B32B 2457/00 Electrical equipment
• CPC Class Codes: B32B 37/12 characterised by using adhesives
• CPC Class Codes: B32B 38/0008 Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation heat treatment B32B38/0036
• CPC Class Codes: C08G 59/245 aromatic
• CPC Class Codes: C08G 59/3209 obtained by polymerisation of unsaturated mono-epoxy compounds
• CPC Class Codes: C08G 59/56 together with other curing agents
• CPC Class Codes: C08K 5/07 Aldehydes; Ketones
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 33/12 Homopolymers or copolymers of methyl methacrylate
• CPC Class Codes: C08L 63/00 Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• CPC Class Codes: C08L 63/10 Epoxy resins modified by unsaturated compounds
• CPC Class Codes: C09J 4/00 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 Class Codes: G11B 5/127 Structure or manufacture of heads, e.g. inductive
• CPC Class Codes: G11B 5/4826 Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56

Abstract

The present invention provides a curable composition for a hard disk drive, the composition comprising: a compound (component A1) having an ethylenically unsaturated group and having no epoxy group and a compound (component A2) having an ethylenically unsaturated group and an epoxy group, or the component A2 and a compound (component A3) having an epoxy group and having no ethylenically unsaturated group, or the component A1 and the component A3, or the component A1, the component A2, and the component A3, or the component A2; a photo-radical polymerization initiator (component B); and a compound (component C) capable of causing the epoxy group to undergo polymerization, and a method for producing a hard disk drive, which comprises the step of bonding a part to a magnetic head portion using the composition.

Claims

1. A curable composition for a hard disk drive, the composition comprising:

a compound (component A1) having an ethylenically unsaturated group and having no epoxy group and a compound (component A2) having an ethylenically unsaturated group and an epoxy group, or the component A2 and a compound (component A3) having an epoxy group and having no ethylenically unsaturated group, or the component A1 and the component A3, or the component A1, the component A2, and the component A3, or the component A2;

a photo-radical polymerization initiator (component B);

a compound (component C) capable of causing the epoxy group to undergo polymerization, the component C being an amine adduct;

an imidazole compound and/or a tertiary amine compound (component D); and

a thermo-radical polymerization initiator (component E) selected from a ketone peroxide, a peroxyketal, a peroxyester, or a peroxydicarbonate.

2. The curable composition for a hard disk drive according to claim 1, wherein the composition obtained after cured has a glass transition temperature of 70 to 160°

C.

3. The curable composition for a hard disk drive according to claim 1, which has a viscosity of 1,000 to 50,000 mPa·

s.

4. The curable composition for a hard disk drive according to claim 1, wherein the component A1 is (a)an (meth)acrylate compound.

5. The curable composition for a hard disk drive according to claim 1, wherein the component A3 is at least one compound selected from the group consisting of a bisphenol A epoxy compound, a bisphenol F epoxy compound, a bisphenol AD epoxy compound, a phenolic novolak epoxy compound, a naphthalene epoxy compound, and an alicyclic epoxy compound.

6. The curable composition for a hard disk drive according to claim 1, wherein the component A2 is (a)an (meth)acrylic acid-modified compound of an epoxy compound.

7. The curable composition for a hard disk drive according to claim 1, wherein the weight ratio of the total of the component A1 and the component A2 to the total of the component A2 and the component A3 {(A1+A2)/(A2+A3)} is 40/60 to 5/95.

8. The curable composition for a hard disk drive according to claim 1, wherein the weight ratio of the total of the component A1 and the component A2 to the component B {(A1+A2)/B} is 99.9/0.1 to 90/10, and wherein the molar ratio of the epoxy group to the component C (epoxy group/C) is 75/25 to 45/55.

9. The curable composition for a hard disk drive according to claim 1, wherein the total amount of the components A1, A2, A3, B, and C in the curable composition is 80 to 100% by weight.

10. A curable composition for a hard disk drive, the composition comprising:

a compound (component A1) having an ethylenically unsaturated group and having no epoxy group and a compound (component AZ) having an ethylenically unsaturated group and an epoxy group, or the component A2 and a compound (component A3) having an epoxy group and having no ethylenically unsaturated group, or the component A1 and the component A3, or the component A1, the component A2, and the component A3, or the component A2;

a photo-radical polymerization initiator (component B);

a compound (component C) capable of causing the epoxy group to undergo polymerization, the component C being an amine adduct;

an imidazole compound (component D); and

a thereto-radical polymerization initiator (component E) selected from a ketone peroxide, a peroxyketal, a peroxyester, or a peroxydicarbonate.

11. The curable composition for a hard disk drive according to claim 10, wherein the imidazole compound is at least one of 2-heptadecylimidazole, 2-undecylimidazole, 2-methylimidazole, and 1,2-dimethylimidazole.

12. The curable composition for a hard disk drive according to claim 10, wherein the composition obtained after cured has a glass transition temperature of 70 to 160°

C.

13. The curable composition for a hard disk drive according to claim 10, which has a viscosity of 1,000 to 50,000 mPa·

s.

14. The curable composition for a hard disk drive according to claim 10, wherein the component A1 is (a)an (meth)acrylate compound.

15. The curable composition for a hard disk drive according to claim 10, wherein the component A3 is at least one compound selected from the group consisting of a bisphenol A epoxy compound, a bisphenol F epoxy compound, a bisphenol AD epoxy compound, a phenolic novolak epoxy compound, a naphthalene epoxy compound, and an alicyclic epoxy compound.

16. The curable composition for a hard disk drive according to claim 10, wherein the component A2 is (a)an (meth)acrylic acid-modified compound of an epoxy compound.

17. The curable composition for a hard disk drive according to claim 10, wherein the weight ratio of the total of the component A1 and the component A2 to the total of the component A2 and the component A3 {(A1+A2)/(A2+A3)} is 40/60 to 5/95.

18. The curable composition for a hard disk drive according to claim 10, wherein the weight ratio of the total of the component A1 and the component A2 to the component B {(A1+A2)/B} is 99.9/0.1 to 90/10, and wherein the molar ratio of the epoxy group to the component C (epoxy group/C) is 75/25 to 45/55.

19. The curable composition for a hard disk drive according to claim 10, wherein the total amount of the components A1, A2, A3, B, and C in the curable composition is 80 to 100% by weight.

20. The curable composition for a hard disk drive according to claim 10, further comprising a tertiary amine compound.