Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1998-08-11
2000-12-19
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
106646, 106674, 106680, 106776, 106778, 106779, 427212, 427221, 4273855, 4273884, 523205, 523211, 524 2, 524 3, 524 4, 524 5, 524 8, J08Q 906, C04B 2410, C04B 2424
Patent
active
061628395
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a composition for the production of low-density gypsum ("light gypsum") which contains an blowing agent for the delayed evolution of gas. The present invention also relates to the production of the blowing agents used, to the use of the composition for the production of light gypsum parts or mouldings and for the production of assembly and insulating foam.
BACKGROUND OF THE INVENTION
Compositions for the production of light gypsum, which contain as key components particulate setting gypsum, more particularly in the form of anhydride and/or hemihydrate, and at least one blowing agent consisting of an acid in the form of a mineral acid or an organic acid and, as an additional component, a gas-forming salt, are already known. In the context of the present invention, gypsum in anhydride form is understood to be pure calcium sulfate with no water of hydration.
Thus, CA 119:78617, an abstract of JP-A-05105544, relates to a low-density gypsum product in which anhydrite, sulfates and calcium carbonate are contacted with one another, resulting in the formation of carbon dioxide gas bubbles.
CA 91:61734, an abstract of SU 77-2522229, relates to a low-density gypsum product in which gypsum hemihydrate is reacted with a sodium carbonate melt, sodium sulfate and water.
CA 89:48101, an abstract of JP-A-76-92941, relates to a low-density gypsum product in sheet form which is obtained by reacting gypsum hemihydrate together with calcium carbonate in the presence of dilute sulfuric acid and water.
CA 85:24916, an abstract of JP-A-74-107006, relates to a low-density gypsum product, in which a gypsum hemihydrate is reacted together with a powder-form alkali metal or alkaline earth metal carbonate in the presence of an aqueous solution additionally containing methyl cellulose. The foamed material thus produced has a density of 0.5 g/cm.sup.3.
CA 84:168779 relates to a gypsum suspension containing calcined gypsum, calcium carbonate and a 40% hexafluorosilicic acid and, for the rest, water. A light gypsum with a density of 0.55 is obtained in this way.
CA 84:154766, an abstract of JP-A-74-77409, relates to a low-density gypsum product, in which a calcined gypsum is contacted with sodium stearate, calcium carbonate, dilute hydrofluoric acid and, for the rest, water and then reacted to form foamed mouldings. The light gypsum mouldings obtained in this way have a density of 0.61.
CA 84:154755, an abstract of JP-A-74-66659, relates to a low-density gypsum product, in which a mixture of 95% by weight calcium sulfate hemihydrate and 5% by weight calcium carbonate is reacted with a 3% sulfuric acid, fibrous material. The mouldings obtained have a specific gravity of less than 0.1.
CA 84:126033, an abstract of JP-A-74-64062, relates to a low-density gypsum product, in which calcined gypsum is reacted together with calcium stearate, calcium carbonate and a 40% aqueous hexafluorosilicic acid solution and water to obtain a molded product having a specific gravity of 0.47.
CA 82:47224, an abstract of JP-A-71-119764, relates to a low-density gypsum product, in which a calcined gypsum is reacted together with water, calcium carbonate, calcium fluorosilicate and barium stearate. A calcined gypsum product with a density of 0.57 g/cm.sup.3 is obtained in this way.
CA 80:73793, an abstract of JP-A-72-5988, relates to a low-density building material, in which a carbonate or bicarbonate is reacted with a phosphoric acid partial ester at room temperature or above room temperature. Gypsum inter alia may be added to this mixture which, if heated to 50.degree. C., leads to a foamed gypsum product with a density of 0.4 g/cm.sup.3.
CA 122:272364, an abstract of German patent 43 33 115, relates to cement, concrete or a similar building material which is obtained by reacting a curable calcium sulfate together with an alkali metal bicarbonate, boric acid, calcium hydroxide and a foaming agent, a plasticizer and a retarding agent. The low-density gypsum products obtained in this way have a density of 1.3 g/cm.sup.3.
CA 120:84826
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Huebner Wilfried
Klauck Wolfgang
Kluth Hermann
Kolenda Felicitas
Harper Stephen D.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Ortiz Daniel S.
Szekely Peter A.
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