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US 2014/0234610 A1Published application
Sound absorbing material and sealing material
AssigneeNitto Denko Corporation
InventorsTakayuki Iwase, Bunta Hirai
Life of this patent
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Abstract
A sound absorbing material is obtained by foaming a rubber composition containing an ethylene-propylene-diene rubber. The content ratio of sulfur in the sound absorbing material calculated by a fluorescent X-ray measurement, based on mass, is 1000 ppm or less. The sound absorbing material has a 50% compressive load value of 0.1 N/cm2 or more and 10 N/cm2 or less. The sound absorbing material has a 50% permanent compression set of less than 50%.
Claims10
A sound absorbing material obtained by foaming a rubber composition containing an ethylene-propylene-diene rubber, wherein
- the content ratio of sulfur calculated by a fluorescent X-ray measurement, based on mass, is 1000 ppm or less,
- the sound absorbing material has a 50% compressive load value of 0.1 N/cm2 or more and 10 N/cm2 or less, and
- the sound absorbing material has a 50% permanent compression set calculated in the following manner of less than 50%.
- 50% permanent compression set:
- obtained by compressing the sound absorbing material by 50% to be stored at 80° C. for 22 hours to be then stored at 23° C. for two hours, thereafter, releasing the compression of the sound absorbing material to measure the strain of the sound absorbing material at 23° C. after the elapse of 24 hours after being released.
2 more elements
A sealing material comprising:
- a sound absorbing material and
- a pressure-sensitive adhesive layer provided on a surface of the sound absorbing material, wherein
- the sound absorbing material is obtained by foaming a rubber composition containing an ethylene-propylene-diene rubber, and
- the content ratio of sulfur in the sound absorbing material calculated by a fluorescent X-ray measurement, based on mass, is 1000 ppm or less,
- the sound absorbing material has a 50% compressive load value of 0.1 N/cm2 or more and 10 N/cm2 or less, and the sound absorbing material has a 50% permanent compression set calculated in the following manner of less than 50%.
- 50% permanent compression set:
- obtained by compressing the sound absorbing material by 50% to be stored at 80° C. for 22 hours to be then stored at 23° C. for two hours, thereafter, releasing the compression of the sound absorbing material to measure the strain of the sound absorbing material at 23° C. after the elapse of 24 hours after being released.
4 more elements
Dependencies are inferred from the claim text.