Gypsum based panel and method for making gypsum based panel
US7708847B2 · kind B2 · utility
11Cited by
15References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2006 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Aug 9, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31971
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of forming a gypsum-based panel product including the steps of: mixing calcined gypsum, water, a foaming agent and a core strengthening agent to form a foamed slurry; depositing the slurry; shaping the slurry to form a board having a core and core surfaces, optionally sandwiched between sheets of liner; and allowing the core to set, and drying the board, wherein the strengthening agent is dextrin, used in an amount not less than 0.1% by weight, based on the amount of calcined gypsum, so that, after drying, there is provided a strengthening dispersion of dextrin throughout the core. Less than 5% dextrin in preferred.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.