Abstract:
A mixture composition of a cellulose ether made from raw cotton linters and at least one additive is used in a gypsum based dry mortar composition wherein the amount of the cellulose ether in the gypsum based dry mortar composition is significantly reduced. When this gypsum based dry mortar composition is mixed with water and applied to a substrate, the water retention, sag resistance, and workability of the wet plaster mortar are comparable or improved as compared to when using conventional similar cellulose ethers.
Abstract:
A mixture composition of a cellulose ether made from raw cotton linters and at least one additive is used in a gypsum based dry mortar composition wherein the amount of the cellulose ether in the gypsum based dry mortar composition is significantly reduced. When this gypsum based dry mortar composition is mixed with water and applied to a substrate, the water retention, sag resistance, and workability of the wet plaster mortar are comparable or improved as compared to when using conventional similar cellulose ethers.
Abstract:
Facing material useful in the manufacture of gypsum wallboard is surfaced treated in order to adhere an amount of seed crystals to improve the adhering affinity of the facing material for wet plaster thereby permitting the manufacture of gypsum wallboard with little or no added starch and reduced amounts of water. Various means for adhering the seed crystals to the facing material are described as well as, a method of converting the facing material and wallboards containing the facing material are also described.