Amine-based consistency reducers for gypsum stucco slurries
AssigneeThe Dow Chemical Company
InventorsAlan P. Croft, Brian D. Koblinski
Life of this patent
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Abstract
A method for reducing the consistency of a water and gypsum stucco slurry comprising admixing water, stucco, and an additive, the additive in an amount effective to reduce the consistency of the admixed slurry as compared to a slurry containing only water and stucco, and the additive selected from the group consisting of one or more polyalkylene polyamines having a molecular weight below 1,000.
Claims19
A method for reducing the consistency of a water and stucco slurry comprising admixing water, stucco, and an additive, the additive in an amount effective to reduce the consistency of the admixed slurry as compared to a slurry containing only water and stucco, and the additive comprising one or more polyalkylene polyamines having a molecular weight below 1,000.
In a method of making gypsum wallboard wherein (1) water and stucco are admixed to produce a slurry, (2) the slurry is deposited between two barriers to produce a board, and (3) the board is heated after the slurry begins to set, the improvement which comprises
- admixing an additive with the water and stucco in step (1), the additive in an amount effective to reduce the consistency of the admixed slurry as compared to a slurry containing only water and stucco, and the additive comprising one or more polyalkylene polyamines having a molecular weight below 1,000.
A method for reducing the consistency of a water and stucco slurry comprising admixing water, stucco, and an additive, the additive in an amount between about 0.01 ppm and about 10,000 ppm, and the additive comprising piperazine, ethylenediamine, ethanolamine, triethylenediamine, and diethylenetriamine.
Dependencies are inferred from the claim text.