Thermal adhesive vibration damping sheets
AssigneesMitsui Petrochemical Industries, Ltd., NEC Environment Engineering Ltd.
InventorsKakutaro Kauchi, Youhei Suzuki, Yasumasa Fujii, Kenji Yokoyama, Yoshio Iida, Masahiko Ooyama
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Abstract
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.
Claims5
A vibration damping sheet which exhibits tackiness upon heating comprising:
- (A) a sheet substrate comprising an asphaltic material and having a thickness in the range of 1 to 5 mm;
- and
- (B) crystalline polyolefin particles on a surface of said sheet substrate (A) having a mean particle size of 1 to 20 .mu.m and exhibiting an endothermic curved having at least one endothermic peak, the highest endothermic peak appearing at a temperature in the range of from 50.degree. to 230.degree. C. as measured by a differential scanning calorimeter, said polyolefin particles being present in an amount of from 0.05 to 0.35 grams per 100 square centimeters.
Dependencies are inferred from the claim text.