Acoustical gypsum board panel and method of making it
US8057915B2 · kind B2 · utility
48Cited by
39References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 31, 2007 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Jul 16, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/665
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The acoustical product of the present invention comprises an acoustical product including a matrix of calcium sulfate dihydrate crystals and expanded perlite distributed throughout the matrix. The expanded perlite has a particle size distribution with at least 10% of the perlite having a particle diameter of 700 microns or more, and the amount of expanded perlite to calcium sulfate dihydrate is about 35% to about 75% by weight, based upon the dry weight of the calcium sulfate dihydrate. A dispersing agent and glass fibers having a particle length of about ¼ inch to about 1 inch are dispersed throughout the gypsum matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.