Vibration damping constructions using acrylate-containing damping materials

• US 5,262,232 A
• Filed: 01/22/1992
• Issued: 11/16/1993
• Est. Priority Date: 01/22/1992
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Drath, David J., Palazzotto, Michael C., Willett, Peggy S., Wilfong, Debra L., Clark, Henry B. III
• Primary Examiner(s): Ryan, Patrick J.
• Assistant Examiner(s): Bahta, Abraham
• Application Number:
  US07/823,872
• Time in Patent Office: 664 Days
• Field of Search: 428/413, 428/327, 428/461, 428/483, 428/463, 428/332, 428/412
• US Class Current: 428/327
• CPC Class Codes: B32B 2307/56 Damping, energy absorption
• CPC Class Codes: B32B 2605/00 Vehicles
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/38 comprising epoxy resins
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 63/00 Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• CPC Class Codes: F16F 1/3605 characterised by their material F16F1/362, F16F1/364, F16F1/366, F16F1/37 take precedence; composition of macromolecular compounds in general C08L
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/298 Physical dimension
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31699 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers

Abstract

Acrylate-only and epoxy-acrylate thermoset resins exhibit high temperature damping behavior. These materials are suitable for damping vibrations in structures and component parts of devices where high temperature performance is required, such as in automobiles, aircraft, industrial equipment and appliances.

Claims

1. A damping construction comprising at least one layer of viscoelastic material applied to a vibratory solid article, said viscoelastic material comprising an epoxy-acrylate thermoset resin.

2. The damping construction according to claim 1, wherein a substrate is applied over said viscoelastic material wherein said substrate is selected from the group consisting of metals, stiff polymeric materials, fiber-reinforced thermosets, ceramic fibers, glass, ceramics and metal fiber-reinforced polyester.

3. The damping construction according to claim 1, wherein said viscoelastic material is the reaction product of an epoxy-acrylate thermoset resin composition comprising:

a. an epoxy monomer;

b. an acrylate monomer; and

c. a catalyst in an effective amount to polymerize said acrylate monomer and said epoxy monomer in the presence of each other.

4. The damping construction according to claim 1, further comprising a thermoplastic selected from the group consisting of polyphenylene sulfone, polybenzimidazole, polyether sulfone, polyester, polyimide, polyetherimide, polyphenylene oxide, polysulfone, acrylate and methacrylate.

5. The damping construction according to claim 1, further comprising a rubber toughening agent.

6. A viscoelastic damping material wherein the damping material is the reaction product of a mixture comprising (a) at least one epoxy monomer, (b) at least one acrylate monomer, (c) a free radical initiator, and (d) a cationic initiator, wherein the cationic initiator comprises:

(1) at least one organometallic complex salt,

(2) a thermally decomposable ester reaction product of a tertiary alcohol and an acid that forms a chelation complex with the metal ion of the organometallic complex salt, and

(3) optionally, a peroxide.

7. The damping construction according to claim 6, wherein the thermally decomposable ester reaction product is selected from the group consisting of oxalate, phosphate, phosphonate, and phosphinate.

8. The damping construction according to claim 7, wherein the viscoelastic damping material is the damping layer applied to a vibratory article.