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US 6,162,839 AGranted
Composition for producing light plaster, production of the foaming agent used therefor and its use
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsWolfgang Klauck, Hermann Kluth, Wilfried Huebner, Felicitas Kolenda
Life of this patent
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Abstract
A composition for producing light plaster contains as main constitutive elements particles of plaster in anhydride or hemihydrate form and at least one foaming agent. The composition is characterized in that the foaming agent generates gas after a delay of 1 minute to 24 hours and constitutes 0.1 to 50% by weight of the total dry mixture. Also disclosed is the use of said composition to produce in-situ cellular plastic and low density plaster moldings.
Claims39
A composition for the production of light gypsum, which comprises:
- particulate, setting gypsum selected from the group consisting of anhydride gypsum, hemihydrate gypsum and mixtures thereof and at least one blowing agent, coated with a water permeable coating of a film forming polymer selected from the group consisting of synthetic polymers, synthetically modified naturally occurring polymers and mixtures thereof, wherein the blowing agent generates carbon dioxide gas with a delay of from about 1 minute to about 60 minutes.
Dependencies are inferred from the claim text.