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US 5,474,840 AGranted
Silica-containing vibration damper and method
AssigneeMinnesota Mining and Manufacturing Company
InventorDonald T. Landin
Life of this patent
Estimating the term…
Abstract
A method for vibrationally damping an article that is subject to resonant vibrations comprises the steps of providing a vibration damper and applying the vibration damper to the article to damp the resonant vibrations. The vibration damper comprises an acrylate viscoelastic vibration damping material and an effective amount of hydrophobic silica. The invention also relates to vibration dampers that utilize the acrylate viscoelastic vibration damping material as well as articles that incorporate the vibration dampers.
Claims13
A damped laminate comprising:
- a) a first constraining layer that has a thickness greater than about 125 .mu.m;
- b) a second constraining layer that has a thickness greater than about 125 .mu.m;
- and
- c) between the first and second constraining layers, a first layer of an acrylate viscoelastic vibration damping material that includes an amount of a hydrophobic silica sufficient to increase the stiffness of the acrylate viscoelastic vibration damping material;
- wherein the first and second constraining layers are each stiffer than the acrylate viscoelastic vibration damping material that includes the silica.
2 more elements
A damped laminate comprising:
- a) a first metal constraining layer that has a thickness greater than about 125 gm;
- b) a second metal constraining layer that has a thickness substantially equal to the thickness of the first constraining layer;
- and
- c) between the first and second constraining layers, a layer of a viscoelastic vibration damping material that comprises (i) about 80 to 98 weight % isooctylacrylate, (ii) about 20 to 2 weight % acrylic acid, wherein the sum of (i) plus (ii) equals 100 weight %, and (iii) about 2 to 15 weight % of hydrophobic silica based on the weight of (i) plus (ii);
- wherein the first and second constraining layers are each stiffer than the layer of viscoelastic vibration damping material.
2 more elements
Dependencies are inferred from the claim text.