Aqueous polymer emulsions for sound damping applications
US-2019311704-A1 · Oct 10, 2019 · US
Sound absorbing material
US10943576B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10943576-B2 |
| Application number | US-201715763078-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 27, 2017 |
| Priority date | Mar 31, 2016 |
| Publication date | Mar 9, 2021 |
| Grant date | Mar 9, 2021 |
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Abstract
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A sound absorbing material includes a fiber group of inorganic fibers, a fiber group of organic fibers, or a fiber group of a fiber blend including the inorganic and organic fibers. In the fiber group, at least junctions between the fibers are coated with a polymeric coating film having a loss factor of 0.1 or more.
First claim
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The invention claimed is: 1. A sound absorbing material comprising: a fiber group of inorganic fibers, a fiber group of organic fibers, or a fiber group of a fiber blend including the inorganic and organic fibers, wherein in the fiber group, at least junctions between the fibers are coated with a polymeric coating film, and a loss factor of the polymeric coating film, measured on the polymeric coating film having a thickness of 100 μm at a measurement frequency of 10 Hz and a measurement temperature of 23° C., is 0.1 or more. 2. The sound absorbing material of claim 1 , wherein in the fiber group, the junctions between the fibers and surfaces of the fibers are coated with the polymeric coating film. 3. The sound absorbing material of claim 1 , wherein the polymeric coating film is made of a thermosetting polymer or a thermosetting elastomer. 4. The sound absorbing material of claim 1 , wherein the polymeric coating film includes polyrotaxane. 5. The sound absorbing material of claim 1 , wherein the fiber group is in a form of nonwoven fabric. 6. The sound absorbing material of claim 1 , wherein the fiber group includes inorganic fibers of at least one type selected from the group consisting of glass fibers and carbon fibers. 7. The sound absorbing material of claim 1 , wherein the fiber group includes organic fibers of at least one type selected from the group consisting of polyester fibers, polyamide fibers, polyacrylic fibers, and polyethylene fibers. 8. The sound absorbing material of claim 1 , wherein a coating amount of the polymeric coating film ranges from 5% to 90% by mass with respect to the fiber group. 9. A method for producing the sound absorbing material of claim 1 , the method comprising: applying, to the fiber group, a coating liquid configured to form the polymeric coating film having a loss factor of 1.0 or more; and carrying out heating after the applying the coating liquid. 10. The sound absorbing material of claim 2 , wherein the polymeric coating film is made of a thermosetting polymer or a thermosetting elastomer. 11. The sound absorbing material of claim 2 , wherein the polymeric coating film includes polyrotaxane. 12. The sound absorbing material of claim 3 , wherein the polymeric coating film includes polyrotaxane. 13. The sound absorbing material of claim 2 , wherein the fiber group is in a form of nonwoven fabric. 14. The sound absorbing material of claim 3 , wherein the fiber group is in a form of nonwoven fabric. 15. The sound absorbing material of claim 4 , wherein the fiber group is in a form of nonwoven fabric. 16. The method of claim 9 , wherein the coating liquid contains polyrotaxane, and a content of the polyrotaxane in the coating liquid is 5% by mass to 20% by mass with respect to solids content of the coating liquid. 17. The sound absorbing material of claim 1 , wherein the fiber group has a percentage of void ranging from 80% to 99.9%. 18. The sound absorbing material of claim 1 , wherein the sound absorbing material has a percentage of void ranging from 70% to 99.9%. 19. The sound absorbing material of claim 1 , wherein the fiber group has an average fiber diameter of 1 μm to 20 μm. 20. The sound absorbing material of claim 1 , wherein the fiber group has an average fiber length of 2 mm to 200 mm.
Assignees
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Classifications
Selection of materials · CPC title
with natural or synthetic rubber, or derivatives thereof · CPC title
Amino-aldehyde resins · CPC title
Polysaccharides or derivatives thereof · CPC title
to obtain coated fabrics · CPC title
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Frequently asked questions
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- What does patent US10943576B2 cover?
- A sound absorbing material includes a fiber group of inorganic fibers, a fiber group of organic fibers, or a fiber group of a fiber blend including the inorganic and organic fibers. In the fiber group, at least junctions between the fibers are coated with a polymeric coating film having a loss factor of 0.1 or more.
- Who is the assignee on this patent?
- Mazda Motor
- What technology area does this patent fall under?
- Primary CPC classification G10K11/168. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 09 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).