US3658635A
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Adhesive interlayer suitable for constrained layer vibration damping
Assignee: ALBERT L EUSTICE
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Filing: 1968-04-02
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Granted: 1972-04-25
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Expires: 1988-04-02
Abstract
Abstract An interlayer which is self-adherent to a base panel and a constraining sheet to form a constrained layer damped structure is provided, the interlayer being a dispersion of visco-elastic polymer having a loss tangent of at least 0.5 in a continuous phase of acidic copolymer, e.g., ethylene/methacrylic acid, with the carboxylic acid groups being neutralized from 0 to 50 percent with metal irons, e.g., sodium. When the visco-elastic polymer is polyurethane, the peel strength of the interlayer is increased, which makes the inter layer useful in a system primarily for adhesive purposes. In another constrained layer damped structure, the interlayer is a composite of a layer of the visco-elastic polymer sandwiched between films of the acidic copolymers.
Inventors
- 👤 Albert L Eustice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:06
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/082; B32B27/00; B32B7/00; B32B7/04; B32B7/12; F; F16; F16F; F16F9/00; F16F9/30; F16F9/306; B32B2264/00; B32B2264/02; B32B2264/0214; B32B2264/0292; B32B2307/00; B32B2307/50; B32B2307/56; B32B2309/00; B32B2309/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31605; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
30 words
The composite layered structure of claim 1 wherein said acidic copolymer is a copolymer of ethylene and 5 to 25 percent by weight of an alpha, beta-ethylenically unsaturated carboxylic acid.
Claim 2
Dependent Claim
22 words
The composite layered structure of claim 1 wherein up to 50 percent of said carboxylic acid groups are meutralized by metal ions.
Claim 3
Dependent Claim
39 words
The composite layered structure of claim 1 wherein said interlayer has a loss tangent of at least 0.5 at a temperature in the range of -20 to +80* C. and frequency in the range of 20 to 20,000 cps.
Claim 4
Dependent Claim
14 words
The composite layered structure of claim 4 wherein said visco-elastic polymer is precured polyurethane.
Claim 5
Dependent Claim
14 words
The composite layered structure of claim 4 wherein said visco-elastic polymer is ethylene/propylene copolymer.
Claim 6
Dependent Claim
13 words
The composite layered structure of claim 6 wherein said ethylene/propylene copolymer is cured.
Claim 7
Dependent Claim
115 words
A constrained layer damped structure comprising a base panel, a constraining sheet, and an interlayer between said panel and said sheet and having its surfaces correspondingly adhered to said panel and said sheet, said interlayer being a dispersion of visco-elastic polymer having a loss tangent of at least 0.5 at a temperature in the range of -20 to +80* C. and frequency in the range of 20 to 20,000 cps., in a continuous phase of a copolymer of ethylene and 8 to 25 percent by weight of an alpha, beta-monoethylenically unsaturated carboxylic acid, with the carboxylic acid groups of said carboxylic acid in said copolymer being neutralized from 0 to 50 percent by metal ions.
Claim 8
Dependent Claim
15 words
The constrained layer damped structure of claim 12 wherein said visco-elastic polymer is pre-cured polyurethane.
Claim 9
Dependent Claim
132 words
The constrained layer damped structure of claim 9 wherein said polyurethane is made by reacting an amount W in parts by weight of an aromatic diisocyanate of molecular weight up to about 300, wherein wherein A is between 4 and 7, B is between 40 and 70, f is the frequency of applied vibration in cycles per second, and T is the temperature of use in *C., with 100 parts by weight of polypropyleneether glycol of number-average molecular weight between 750 and 2,500 and an amount by weight of low molecular weight hydroxyl compound selected from the group consisting of aliphatic diol and aliphatic triol sufficient to react with 70 to 100 percent of the NCO groups in excess of those required to form a bis-urethane from each molecule of polypropyleneether glycol.
Claim 10
Dependent Claim
22 words
The constrained layer damped structure of claim 12 having a per cent of critical damping of at least 2.0 at 25* C.
Claim 11
Dependent Claim
34 words
The constrained layer damped structure of claim 8 wherein said loss tangent of at least 0.5 is at a temperature of 25* C. and a frequency in the range of 100 to 10,000 cps.
Claim 12
Dependent Claim
15 words
The constrained layer damped structure of claim 8 wherein said visco-elastic polymer is ethylene/propylene copolymer.
Claim 13
Dependent Claim
25 words
The constrained layer damped structure of claim 13 wherein said copolymer contains units derived from a third monomer for supplying sulfur curability to said copolymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |