Method of making a sound-absorbent material, and material so made
US4299883A · kind A · utility
5Cited by
12References
6Claims
0Family size
Inventors
Key dates
| Filing date | Oct 16, 1979 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | Oct 16, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31551
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A sound-absorbent material is made by compressing foamed synthetic plastics material so as to rupture the walls of at least some of the cells therein. Preferably a slab of polycarbodiimide foam is compressed to about 50% to 66% of its initial thickness while cold or at a temperature below 120.degree. C., and is moulded to shape while below 120.degree. C., being bonded if desired to one or more sheets of covering or strengthening or decorative fabric or felt or other facing material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.