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US 11,046,831 B2Granted
Sound-insulating sponge material, vehicle sealing material, and weather strip
AssigneesNishikawa Rubber Co., Ltd., Daio Paper Corporation
InventorsKeigo Matsumoto, Syoichi Nakamoto, Katsunori Nakashima, Junya Okawa, Takaaki Imai
Life of this patent
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Abstract
A surface of a rubber sponge material 4 such as a vehicle weather strip is covered with a resin coat 6 containing dispersed cellulose fibers 5.
Claims9
A sound-insulating sponge material, comprising:
- a rubber sponge material made of an ethylene-propylene-diene rubber and having a specific gravity range of 0.45 to 0.57;
- and
- a resin coat that coats a surface of the rubber sponge material, the resin coat containing:
- silicone resin, and
- cellulose fibers dispersed in the silicone resin, wherein:
- the cellulose fibers are made from a broad-leaved tree bleached kraft pulp, and a content of the cellulose fibers in the resin coat is about 10% by mass, and
- wherein the sound-insulating sponge material exhibits a sound insulating property such that a sound transmission across the sound-insulating sponge material is less than a same sound-insulating sponge material without the cellulose fibers dispersed in the resin coat.
4 more elements
A sound-insulating sponge material, comprising:
- a rubber sponge material made of an ethylene-propylene-diene rubber and having a specific gravity of 0.45 or more and 0.57 or less;
- and
- a resin coat that coats a surface of the rubber sponge material, the resin coat containing:
- silicone resin, and
- cellulose fibers dispersed in the silicone resin, wherein:
- the cellulose fibers are made from a broad-leaved tree bleached kraft pulp,
- a content of the cellulose fibers in the resin coat is about 10% by mass, and
- the cellulose fibers are fibrillated to have a specific surface area greater than or equal to 5 m2/g and less than or equal to 600 m2/g.
5 more elements
Dependencies are inferred from the claim text.