US5118562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration damper having extended temperature range and low temperature shock resistance
Assignee: 3M Co
•
Filing: 1990-09-24
•
Granted: 1992-06-02
•
Expires: 2010-09-24
Abstract
Abstract Constrained layer damping structures are often based on viscoelastic layers of iso-octyl acrylate:acrylic acid or analogous copolymers. As the acrylic acid content is increased, the peak damping temperature also increases; unfortunately, however, the copolymer becomes more brittle and susceptible to shock, especially at low temperatures. Incorporating small amounts of rubbery polymer particles (especially core-shell polymers) in the viscoelastic copolymer alleviates this problem.
Inventors
- 👤 Roger W. Johnson
- 👤 William D. Sell
- 👤 Charles D. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:24
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/04; B32B25/08; B32B27/00; B32B27/30; B32B27/06; C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/08; B32B2250/00; B32B2250/24; B32B2307/00; B32B2307/50; B32B2307/558; B32B2307/56; C08L2205/00; C08L2205/14; C08L2205/18; C08L51/00; C08L51/04; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A damping structure comprising in combination a stiff constraining sheet, to one surface of which is firmly adherently bonded a layer of viscoelastic material that comprises (a) a matrix consisting essentially of a brittle copolymer of monomers consisting essentially of (1) at least one alkyl acrylate ester of non-tertiary alcohol having 1-14 carbon atoms and (2) at least one copolymerizable polar monomer, and (b) dispersed throughout said viscoelastic material, a multiplicity of rubbery particles, the rubbery particles consisting essentially of a rubbery core surrounded by a thin shell of polymeric material that is compatible with the copolymer matrix.
Claim 2
Dependent Claim
98 words
A damping structure comprising in combination a stiff constraining sheet, to one surface of which is firmly adherently bonded a layer of viscoelastic material that comprises (a) a matrix consisting essentially of a brittle copolymer of monomers consisting essentially of (1) at least one alkyl acrylate ester of non-tertiary alcohol having 1-14 carbon atoms and (2) at least one copolymerizable polar monomer, and (b) dispersed throughout said viscoelastic material, a multiplicity of rubbery particles, the rubbery particles consisting essentially of a rubbery core surrounded by a thin shell of polymeric material that is compatible with the copolymer matrix.
Claim 3
Dependent Claim
15 words
The damping structure of claim 1 wherein the copolymer is an iso-octyl acrylate:acrylic acid copolymer.
Claim 4
Dependent Claim
15 words
The damping structure of claim 2 wherein the copolymer contains at least 20% acrylic acid.
Claim 5
Dependent Claim
15 words
The damping structure of claim 2 wherein the copolymer contains at least 25% acrylic acid.
Claim 6
Dependent Claim
15 words
The damping structure of claim 2 wherein the copolymer contains at least 30% acrylic acid.
Claim 7
Dependent Claim
14 words
The damping structure of claim 1 wherein the viscoelastic material contains 1-15% core-shell polymer.
Claim 8
Dependent Claim
14 words
The damping structure of claim 1 wherein the viscoelastic material contains 5-10% core-shell polymer.
Claim 9
Dependent Claim
22 words
The damping structure of claim 1 wherein the core-shell polymer has a core of butyl acrylate and a shell of methyl methacrylate.
Claim 10
Dependent Claim
13 words
The damping structure of claim 1 wherein the rubbery particles are styrene:butadiene rubber.
Claim 11
Dependent Claim
22 words
The damping structure of claim 1 wherein the core-shell polymer has a core of styrene:butadiene rubber and a shell of methyl methacrylate.
Claim 12
Dependent Claim
65 words
In a damping structure incorporating a layer of brittle viscoelastic material, the improvement comprising incorporating in said layer a sufficient amount of rubbery polymer particles to render said viscoelastic layer less susceptible to shock at room temperature or below and further wherein the rubber particles comprise a rubbery core surrounded by a thin shell of a polymeric material that is compatible with the viscoelastic material.
Claim 13
Dependent Claim
65 words
In a damping structure incorporating a layer of brittle viscoelastic material, the improvement comprising incorporating in said layer a sufficient amount of rubbery polymer particles to render said viscoelastic layer less susceptible to shock at room temperature or below and further wherein the rubber particles comprise a rubbery core surrounded by a thin shell of a polymeric material that is compatible with the viscoelastic material.
Claim 14
Dependent Claim
42 words
The damping structure of claim 2 wherein the viscoelastic layer comprises a matrix of a brittle copolymer of 20-30 parts acrylic acid and correspondingly 80-70 parts isooctyl acrylate and, dispersed throughout said matrix of brittle copolymer 5-10 parts of compatible core-shell polymer.
Claim 15
Dependent Claim
14 words
A damped laminate comprising the damping structure of claim 1 adhered to a substrate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |