Nec Environment Engineering, Ltd.

Mitsui Petrochemical Industries, Ltd.

Mitsui Petrochemical Ind. Ltd.

Yasumasa Fujii

Kenji Yokoyama

Yoshio Iida

Youhei Suzuki

Toru Tomoshige

Kakutaro Kauchi

Masahiko Ooyama

A thermal adhesive vibration damping sheet comprising a sheet substrate having crystalline polyolefin particles attached to a surface thereof, said polyolefin particles having a mean particle size of 1 to 20 .mu.m and exhibiting an endothermic curve having a high temperature side endothermic peak in the range of from 50.degree. to 230.degree. C. as measured by a differential scanning calorimeter. The sheet has improved blocking resistance, adhesion to sheet steel through heat fusion, and impact resistance at low temperatures.

Thermal adhesive vibration damping sheets

Disclosed is a damping member comprising, as main components, a petroleum resin, asphalt and mica. By selecting and using mica as the filler and incorporating mica in an amount smaller than the amount of asphalt, the adhesion follow-up property to a substrate can be improved. This damping material can be attached simply and assuredly to a substrate having a curved surface, such as a tube or pipe, an air-conditioning duct or a part of a building or vehicle by heat-pressing or heat-fusion-bonding, and a product having an excellent damping effect is provided.

Composition having damping property, damping member, process for

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Ichihara, Japan

Yasumasa Fujii