Gypsum composition
AssigneeThe Trustees of Colombia University in the City of New York
InventorsSemyon Shimanovich, Christian Meyer, Leon Cukrowski
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Abstract
This invention relates generally to a gypsum composition having improved setting and strength characteristics. More specifically, this invention relates to a gypsum composition comprising an acrylic latex and an aliphatic alcohol wherein the composition has a retarded setting rate. This gypsum composition may further comprise a melamine-formaldehyde polymer and/or a styrene butadiene latex. This invention further relates to an artificial marble gypsum composition.
Claims18
A plaster composition which comprises:
- (a) calcium sulfate hemihydrate,
- (b) an acrylic latex,
- (c) an alcohol selected from the group consisting of aliphatic alcohols and defoaming agents, and
- (d) a melamine-formaldehyde polymer, wherein ingredients (b), (c) and (d) are present in amounts which are sufficient to:
- (1) retard the set time and increase the flow of a wet plaster composition formed upon adding water to the plaster composition, and (2) increase the strength of a set gypsum composition formed upon hardening after adding water to the plaster composition.
A set gypsum composition which comprises a set reaction product of a wet plaster composition comprising:
- (a) calcium sulfate hemihydrate,
- (b) an acrylic latex,
- (c) an alcohol selected from the group consisting of aliphatic alcohols and defoaming agents,
- (d) a melamine-formaldehyde polymer, and
- (e) an amount of water at least sufficient to convert the calcium sulfate hemihydrate to calcium sulfate dihydrate,
- wherein ingredients (b), (c) and (d) are present in amounts which are sufficient to:
- (1) retard the set time and increase the flow of the wet plaster composition, and (2) increase the strength of the set gypsum composition formed upon hardening of the wet plaster composition.
A wet plaster composition comprising:
- (a) calcium sulfate hemihydrate,
- (b) an acrylic latex,
- (c) an alcohol selected from the group consisting of aliphatic alcohols and defoaming agents,
- (d) a melamine-formaldehyde polymer, and
- (e) an amount of water sufficient to convert the calcium sulfate hemihydrate to calcium sulfate dihydrate,
- wherein ingredients (b), (c) and (d) are present in amounts which are sufficient to:
- (1) retard the set time and increase the flow of the wet plaster composition, and (2) increase the strength of a set gypsum composition formed upon hardening of the wet plaster composition.
Dependencies are inferred from the claim text.