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US 7,799,840 B2Granted
Thermoplastic vibrational damper with constraining layer
AssigneeIntellectual Property Holdings, LLC
InventorsMaurice E. Wheeler, Bradley D. McDonel
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AssigneeIntellectual Property Holdings, LLC
InventorsMaurice E. Wheeler, Bradley D. McDonel
Estimating the term…
A constrained layer damping structure is provided, including a panel to be damped, a constraining layer and a layer of foam vibration damping material sandwiched therebetween. In one embodiment, the foam vibration damping material is provided from a composition including 5-50 weight percent polyvinyl butyral, 2-20 weight percent plasticizer, 25-65 weight percent filler, 1-15 weight percent tackifier, and 0.1-8 weight percent blowing agent, wherein the composition includes 15-65 weight percent total thermoplastic inclusive of polyvinyl butyral. In a further embodiment, the polyvinyl butyral is provided as recycled material from recycled auto glass, and includes a small quantity of plasticizer, typically but not necessarily of the phthalate-type or hexanoate-type.
A composition for a vibration-damping material, comprising 5-50 weight percent polyvinyl butyral and 5-60 weight percent vinyl acetate polymer, 2-20 weight percent plasticizer, 25-65 weight percent filler, 1-15 weight percent tackifier, and 0.1-8 weight percent blowing agent, wherein the composition comprises 25-65 weight percent total thermoplastic inclusive of polyvinyl butyral and vinyl acetate polymer.
A composition for a vibration-damping material, comprising 6-8 weight percent plasticizer, 39-50 weight percent recycled polyvinyl butyral that includes additional plasticizer therein, 10-12 weight percent total ethylene vinyl acetate, 30-40 weight percent filler, 2.5-2.8 weight percent tackifier, 0.5-1 weight percent surfactant, 0.3-1 weight percent activator, 0.3-1 weight percent colorant, and 3-4 parts by weight per hundred rubber of a blowing agent, wherein ‘rubber’ refers to all of the remaining components in said composition taken together.
A vibration-damping composition comprising 25-65 weight percent total thermoplastic, 2-15 weight percent plasticizer, 25-65 weight percent filler, 1-15 weight percent tackifier, and 0.1-8 weight percent blowing agent, said thermoplastic component comprising two or more materials selected from the group consisting of:
Dependencies are inferred from the claim text.