Patent US903484A successfully refreshed from Google Patents.
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EP0100147A2
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EP
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Vibration-damping constrained-layer constructions
Assignee: 3M Co
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Filing: 1983-06-24
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Granted: —
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Expires: 2003-06-24
Abstract
Abstract A constrained-layer construction comprising a stiff layer or substrate and a layer of a viscoelastic polymer which is the reaction product of a) 25 to 75 weight percent of an acryloyl or methacryloyl derivative of at least one oligomer, said oligomer having a glass transition temperature of less than 25 °C and a molecular weight per oligomer of 600 t0 20,000, and b) 75 to 25 weight percent of a copolymerizable monomer whose homopolymer has a glass transition temperature of at least 50 °C, the copolymer being suitable for damping vibrations at relatively high temperatures, e.g., 50-150 °C, is disclosed. Also included is a process for damping vibrations in component parts of devices used in automotive, aerospace, and computer industries.
Inventors
- 👤 William A. C/O Minnesota Mining And Driscoll
- 👤 Steven M. C/O Minnesota Mining And Heilmann
- 👤 Jerald K. C/O Minnesota Mining And Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:18
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/02; B32B7/022; B32B27/00; B32B27/30; B32B27/308; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; B32B2307/00; B32B2307/50; B32B2307/56; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/4927; Y10T29/49272; Y10T428/00; Y10T428/26; Y10T428/31504; Y10T428/31507; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T428/31522; Y10T428/3154; Y10T428/31544; Y10T428/31551; Y10T428/31573; Y10T428/3158; Y10T428/31587; Y10T428/31616; Y10T428/3162; Y10T428/31623; Y10T428/31645; Y10T428/31649; Y10T428/31652; Y10T428/31663; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699; Y10T428/31725; Y10T428/3175; Y10T428/31757; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192; Y10T428/31935
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
A constrained-layer construction for damping vibrations in solid articles at a temperature of at least 50°C, said construction comprising a substrate having a stiffness relative to stainless steel of at least 0.40 and bearing a continuous layer of a copolymer having a thickness of 0.01 mm to 100 mm, said copolymer having a storage modulus of at least 1 x 10 7 dynes/cm 2 and a loss tangent above 0.5 at 100°C and 1000 Hz, said copolymer being the reaction product of a mixture comprising: a) 25 to 75 weight percent of an acryloyl or methacryloyl derivative of at least one oligomer, said oligomer having a glass transition temperature of less than 25°C and a molecular weight per oligomer of 600 to 20,000, and b) 75 to 25 weight percent of a copolymerizable monomer whose homopolymer has a glass transition temperature of at least 50°C.
Claim 2
Dependent Claim
145 words
A constrained-layer construction for damping vibrations in solid articles at a temperature of at least 50°C, said construction comprising a substrate having a stiffness relative to stainless steel of at least 0.40 and bearing a continuous layer of a copolymer having a thickness of 0.01 mm to 100 mm, said copolymer having a storage modulus of at least 1 x 10 7 dynes/cm 2 and a loss tangent above 0.5 at 100°C and 1000 Hz, said copolymer being the reaction product of a mixture comprising: a) 25 to 75 weight percent of an acryloyl or methacryloyl derivative of at least one oligomer, said oligomer having a glass transition temperature of less than 25°C and a molecular weight per oligomer of 600 to 20,000, and b) 75 to 25 weight percent of a copolymerizable monomer whose homopolymer has a glass transition temperature of at least 50°C.
Claim 3
Dependent Claim
132 words
The constrained-layer construction according to Claim 1 wherein said oligomer has the formula wherein: R is the organic residue of a nucleophilic group-substituted oligomer having a molecular weight of 600 to 20,000, glass transition temperature of less than 25°C, and n hydroxyl, amino or thiol groups; n is the valence of R having a value of at least one; Y is selected from -O-, -S- and in which R 2 is a) hydrogen, or b) a hydrocarbyl group selected from (1) an alkyl or cycloalkyl group having 1 to 12 carbon atoms optionally substituted by cyano, hydrogen or alkoxy group having 1 to 4 carbon atoms, or (2) an aryl or aralkyl group having 6 to 12 carbon atoms; X is a divalent connecting group; and R l is hydrogen or methyl.
Claim 4
Dependent Claim
29 words
The construction according to any preceding claim wherein said nucleophilic group-substituted oligomer is selected from the group consisting of polyoxyalkylene, poly(perfluoro-oxyalkylene), polyalkyleneimine, polyester, polyolefin, polyacrylate, polyamide, and polysiloxane oligomers.
Claim 5
Dependent Claim
176 words
The construction according to any preceding claim wherein said divalent connecting group, X, is selected from the group consisting of a covalent bond, wherein: a and be independently are integers having a value of 2 to 12; R 3 is a covalent bond, a methylene group, an ethylene group, the last two of which can be substituted by an alkyl group having 1 to 6 carbon atoms or a phenyl group; R 4 and R 5 are independently hydrogen, an alkyl group or a cycloalkyl group having 1 to 12 carbon atoms, an aryl or aralkyl group having 6 to 12 carbon atoms, or R 4 and R 5 taken together with the carbon to which they are attached form a 5-to 12-membered carbocyclic ring; and R 6 is an alkyl group or cycloalkyl group having 1 to 15 carbon atoms, or an aryl or aralkyl group having 6 to 15 carbon atoms; with the proviso that when R 2 is a hydrocarbyl group, then at least one of R 4 and R 5 is hydrogen.
Claim 6
Dependent Claim
13 words
The construction according to any preceding claim wherein said oligomer has the formula
Claim 7
Dependent Claim
22 words
The construction according to any preceding claim wherein said copolymerizable monomer is selected from the group consisting of methyl methacrylate and N,N-dimethylacrylamide.
Claim 8
Dependent Claim
27 words
The construction according to any preceding claim further comprising up to 50 percent by weight of a diluting free-radically polymerizable monomer having a Tg less than 50°C.
Claim 9
Dependent Claim
32 words
The construction according to any preceding claim wherein said substrate is selected from the group consisting of metals, stiff polymeric materials, glass fiber-reinforced plastics, ceramic fiber, glass, ceramics, and metal fiber-reinforced polyester.
Claim 10
Dependent Claim
54 words
A process for damping the vibration of a vibrating solid article at temperatures above 50°C, said process comprising the steps: a) providing a constrained-layer construction according to any preceding claim, wherein said viscoelastic copolymer is admixed with an effective amount of a free-radical generator, and b) affixing said constrained-layer construction onto said solid article.
References Cited (Backward Citations)
No citation records indexed.
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