Effective use of dispersants in wallboard containing foam

Details Effective use of dispersants in wallboard containing foam Effective use of dispersants in wallboard containing foam

2006-06-09

2009-06-09

Wood, Elizabeth D (Department: 1793)

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

C106S667000, C106S670000, C106S671000, C106S672000, C106S674000, C106S677000, C106S678000, C106S772000, C106S778000, C106S783000, C106S785000, C106S788000, C106S682000

Reexamination Certificate

active

07544242

ABSTRACT:
Effective use of dispersants in wallboard containing foam results from a method where stucco is mixed with a first dispersant and a first quantity of water to form a gypsum slurry. A soap is blended with a second dispersant and a second quantity of water to make a foam. Subsequently, the foam is combined with the slurry. Choice of different first and second dispersants and their relative amounts allows control of the size distribution of the foam bubbles in the slurry and the resulting voids in the gypsum core. Use of the same dispersant in both the mixer and the foam water provides a boost in efficacy of the dispersant.

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