High molecular weight additives for calcined gypsum and...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

Reexamination Certificate

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Reexamination Certificate

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10511499

ABSTRACT:
A mixture is used in conjunction with water is used for preparing a slurry that hydrates to form an exterior gypsum cement. The mixture includes 30-70% by weight hydraulic cement, 30-70% by weight calcined gypsum and 0.05-2.5% polycarboxylate. When the mixture is added to water less than 40 weight % based on the weight of the mixture, a slurry is formed that expands very little while it cures.

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“Gypsum Dispersing Agents,” Steven A. Schwartz, Global Gypsum Conference 2002, Florida, Mar. 3-4, 2002.

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