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Vibration damping soundproof sheets for use in vehicles

  • US 4,734,323 A
  • Filed: 04/09/1987
  • Issued: 03/29/1988
  • Est. Priority Date: 04/22/1986
  • Status: Expired due to Fees
First Claim
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1. Vibration damping soundproof sheet for use in vehicles comprising:

  • (A) a vibration damping layer-forming material comprising a rubber type adhesive blend, in which a tackifier, an inorganic filler, a fiberous filler and a softening agent was blended to a matrix comprising a rubber ingredient and a bituminous ingredient, and(B) a soundproof layer-forming material comprising a foamed rubber blend to be bonded to form on said vibration damping layer forming material, in which a foaming agent and other rubber blending agents are blended to a rubber type polymer containing from 15 to 85% by weight of 1,2-polybutadiene ingredient.

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