Vibration damping composition

• US 8,664,286 B2
• Filed: 09/19/2006
• Issued: 03/04/2014
• Est. Priority Date: 09/20/2005
• Status: Active Grant

• Current Assignee: Nihon Tokushu Toryo Co., Ltd., Nippon Shokubai Company Limited
• Original Assignee: Nihon Tokushu Toryo Co., Ltd., Nippon Shokubai Company Limited
• Inventors: Yasui, Yoshihiko, Suzuki, Hiroshi, Nagaishi, Dai
• Primary Examiner(s): COONEY, JOHN M
• Application Number:
  US12/067,329
• Publication Number:
  US 20090048357A1
• Time in Patent Office: 2,723 Days
• Field of Search: 521/70, 521/75, 521/134, 521/138, 521/139, 523/201, 524/458
• US Class Current: 521/70
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08F 220/14 Methyl esters , e.g. methyl (meth)acrylate
• CPC Class Codes: C08F 220/1804 C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• CPC Class Codes: C08F 220/1808 C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
• CPC Class Codes: C08F 265/04 on to polymers of esters
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08F 285/00 Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
• CPC Class Codes: C08K 7/00 Use of ingredients characterised by shape
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence
• CPC Class Codes: C09D 151/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C09D151/04, C09D151/06 take precedence

Abstract

To provide a vibration damping composition: excellent in vibration damping property and thermal drying property in a wide temperature range; and sufficiently suppressing sagging of a vibration damping coating film on the vertical surface; and therefore useful for vibration damping materials of various structures.

A vibration damping composition comprising an emulsion for vibration damping materials, a foaming agent, and an inorganic pigment, wherein the emulsion for vibration damping materials comprises a particle having a core part formed from an acrylic copolymer (A) and a shell part formed from an acrylic copolymer (B), and at least one of the acrylic copolymers (A) and (B) is prepared by copolymerizing a monomer component comprising methacrylic acid.

Claims

1. A vibration damping composition comprising an emulsion for vibration damping materials, a foaming agent, and an inorganic pigment,

wherein the emulsion for vibration damping materials comprises a particle having a core part formed from an acrylic copolymer (A) and a shell part formed from an acrylic copolymer (B), and

the acrylic copolymer (B) forming the shell part is prepared by copolymerizing a monomer component comprising methacrylic acid;

wherein the amount of said methacrylic acid is 4% by weight or more and is 20% by weight or less, relative to 100% by weight of the total amount of the monomer component used for preparing the acrylic copolymer (B) comprising methacrylic acid, and wherein the inorganic pigment comprises a flaky inorganic pigment, wherein said flaky inorganic pigment is a pigment forming a layer structure inside a coating film formed from said vibration damping composition of which they are a part, and wherein said flaky inorganic pigment comprises mica, and the amount of the flaky inorganic pigment is 30 to 150 parts by weight relative to 100 parts by weight of the emulsion for vibration damping materials.

2. The vibration damping composition according to claim 1,

wherein the emulsion for vibration damping materials is produced by performing an emulsion polymerization step using monomer components having different glass transition temperatures in multiple stages.

3. The vibration damping composition according to claim 1,

wherein the emulsion for vibration damping materials is produced by performing an emulsion polymerization step using a monomer component constituting the core part formed from the acrylic copolymer (A) prior to an emulsion polymerization step using a monomer component constituting the shell part formed from the acrylic copolymer (B).

4. The vibration damping composition according to claim 1,

wherein the vibration damping composition comprises a foaming agent which foams during drying by heating.

5. The vibration damping composition according to claim 1,

wherein the vibration damping composition comprises 50 to 700 parts by weight of inorganic pigment relative to 100 parts by weight of the emulsion for vibration damping materials.

6. An aqueous vibration damping material which comprises the vibration damping composition of claim 1.

7. A method of coating a substrate which comprises coating the substrate with the vibration damping composition of claim 1, and then drying the vibration damping composition, wherein the vibration damping composition has a face weight of 1.0 to 7.0 kg/m² after drying.

8. A vibration damping material obtained by the coating method of claim 7.

9. The vibration damping composition according to claim 2,

wherein the emulsion for vibration damping materials is produced by performing an emulsion polymerization step using a monomer component constituting the core part formed from the acrylic copolymer (A) prior to an emulsion polymerization step using a monomer component constituting the shell part formed from the acrylic copolymer (B).

10. The vibration damping composition according to claim 2,

wherein the vibration damping composition comprises a foaming agent which foams during drying by heating.

11. The vibration damping composition according to claim 3,

wherein the vibration damping composition comprises a foaming agent which foams during drying by heating.

12. The vibration damping composition according to claim 2,

wherein the vibration damping composition comprises 50 to 700 parts by weight of inorganic pigment relative to 100 parts by weight of the emulsion for vibration damping materials.

13. The vibration damping composition according to claim 3,

wherein the vibration damping composition comprises 50 to 700 parts by weight of inorganic pigment relative to 100 parts by weight of the emulsion for vibration damping materials.

14. The vibration damping composition according to claim 4,

wherein the vibration damping composition comprises 50 to 700 parts by weight of inorganic pigment relative to 100 parts by weight of the emulsion for vibration damping materials.

15. A method of coating a substrate which comprises coating the substrate with the vibration damping composition of claim 2, and then drying the vibration damping composition, wherein the vibration damping composition has a face weight of 1.0 to 7.0 kg/m² after drying.

16. The vibration damping composition according to claim 1 wherein the acrylic copolymer (A) has a SP value smaller than that of the acrylic copolymer (B) and the difference in SP value between the acrylic copolymers (A) and (B) is 0.2 or more.

17. The vibration damping composition according to claim 1 wherein the acrylic copolymer (A) has a glass transition temperature (TgA) higher than a glass transition temperature (TgB) of the acrylic copolymer (B) and the difference between TgA and TgB is 15°

C. or more.

18. The vibration damping composition according to claim 1, wherein the amount of the flaky inorganic pigment is 40 to 120 parts by weight relative to 100 parts by weight of the emulsion for vibration damping materials.

19. The vibration damping composition according to claim 1, wherein both of the acrylic copolymers (A) and (B) are prepared by copolymerizing a monomer component comprising methacrylic acid;

wherein the amount of said methacrylic acid is 4% by weight or more and is 20% by weight or less, relative to 100% by weight of the total amount of the monomer component used for preparing the acrylic copolymer comprising methacrylic acid.