Dispersant for plaster
AssigneeKao Corporation
InventorsFujio Yamato, Kazushige Kitagawa, Yoshinao Kohno
Life of this patent
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Abstract
An dispersant for plaster comprising a copolymer prepared by copolymerizing (a) a polyalkylene glycol monoester monomer having 2 to 300 mols of an oxyalkylene group(s) each having 2 to 3 carbon atoms, with (b) at least one monomer selected from among acrylic monomers, unsaturated dicarboxylic monomers and allylsulfonic monomers. When the dispersant of the present invention is used in preparing a plaster board, the foam stability is maintained so that the quality of the plaster board composition can be easily controlled.
Claims3
A method for improving the foam-stability of a plaster composition which comprises adding a copolymer prepared by copolymerizing a monomer (a) represented by the following formula (A) with a monomer (b) selected from the group consisting of the compounds represented by the following formula (B) and those represented by the following formula (C) to a plaster composition:
- wherein R1 and R2 may be the same or different from each other and each represents a hydrogen atom or a methyl group;
- ml is an integer of 0 to 300;
- AO represents an oxyalkylene group having 2 to 3 carbon atoms;
- n is a number of 2 to 300;
- and X represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms,
- wherein R3, R4 and R5 may be the same or different from one another and each represents a hydrogen atom, a methyl group or a group represented by the formula:
- (CH2)m2COOM2 (wherein m2 is an integer of 0 to 2;
- and M2 represents a hydrogen atom, an alkali metal atom, ½ an alkaline earth metal atom, an ammonium group, an alkylammonium group or a substituted alkylammonium group);
- and M1 represents a hydrogen atom, an alkali metal atom, ½ an alkaline earth metal atom, an ammonium group, an alkylammonium group or a substituted alkylammonium group, and
- wherein R6 represents a hydrogen atom or a methyl group;
- and Y represents a hydrogen atom, an alkali metal atom, ½ an alkaline earth metal atom, an ammonium group, an alkylammonium group or a substituted alkylammonium group.
A plaster composition comprising a copolymer prepared by copolymerizing a monomer (a) represented by the following formula (A) with a monomer (b) selected from the group consisting of the compounds represented by the following formula (B) and those represented by the following formula (C), plaster and water:
- wherein R1 and R2 may be the same or different from each other and each represents a hydrogen atom or a methyl group;
- ml is an integer of 0 to 300;
- AO represents an oxyalkylene group having 2 to 3 carbon atoms;
- n is a number of 2 to 300;
- and X represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms,
- wherein R3, R4 and R5 may be the same or different from one another and each represents a hydrogen atom, a methyl group or a group represented by the formula:
- (CH2)m2COOM2 (wherein m2 is an integer of 0 to 2;
- and M2 represents a hydrogen atom, an alkali metal atom, ½ an alkaline earth metal atom, an ammonium group, an alkylammonium group or a substituted alkylammonium group);
- and M1 represents a hydrogen atom, an alkali metal atom, ½ an alkaline earth metal atom, an ammonium group, an alkylammonium group or a substituted alkylammonium group, and
- wherein R6 represents a hydrogen atom or a methyl group;
- and Y represents a hydrogen atom, an alkali metal atom, ½ an alkaline earth metal atom, an ammonium group, an alkylammonium group or a substituted alkylammonium group.
Dependencies are inferred from the claim text.