Automotive sound-proof materials and damping materials therefor
AssigneesHonda Giken Kogyo Kabushiki Kaisha, Nihon Tokushu Toryo Co., Ltd.
InventorsTakashi Maeda, Tsuyoshi Yamashita, Mitsuo Nakamura, Hiroshi Suzuki, Hideo Fujii
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Abstract
A sound-absorption material for an automobile includes a damping material, a sound-absorption material and a surface material. The damping, sound-absorption and surface materials are integrated together. The damping material includes a moldable plastic constraining material and an adhesive damping sheet containing a petroleum resin. The sound-proof material is integrally attachable to an automotive sheet material such as a dashboard.
Claims3
An automotive sound-proof material comprising a damping material, a sound-absorption material and a surface material, wherein:
- said damping, sound absorption and surface materials are integrated together;
- said damping material including a plastic constraining material, moldable at ambient temperature, selected from a group consisting of polyolefins and vinyl chloride resins and an adhesive damping sheet also moldable at ambient temperature and formed from materials selected from a group consisting of asphalt, petroleum resin, polybutadiene, isocyanate, rubber, filler and mixtures thereof effective in forming said damping sheet;
- said sound absorption material selected from a group consisting of foamed synthetic resins, felts, non-woven fabrics, synthetic resin fibers and mineral fibers;
- said surface material, moldable at ambient temperature, being formed into a sheet from at least one or more materials selected from a group consisting of straight asphalt, blown asphalt, a mixture of straight and blown asphalt, a rubbery material selected from a group consisting of styrene-butadiene base synthetic rubber, butyl base rubber, natural rubber and any mixtures thereof, and a synthetic resin material with suitable fillers selected from a group consisting of calcium carbonate, talc, clay, barium sulfate, mica and mixtures thereof;
- whereby said sound-proof material is integrally attachable to an automotive sheet material at ambient temperature.
Dependencies are inferred from the claim text.