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US 6,492,450 B1Granted
Use of polymers in gypsum wallboard
AssigneeRohm and Haas Company
InventorOscar Hsien-Hsiang Hsu
Life of this patent
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Abstract
A composition useful as gypsum wallboard and a method for protecting gypsum wallboard against water are disclosed. The composition and the method utilize a polymer containing a hydrophobically modified monomer to provide water resistance.
Claims14
A composition comprising:
- from 80 to 99.5 parts by weight calcium sulfate;
- and
- from 0.5 to 20 parts by weight of a polymer including as polymerized units:
- a) from 20 to 95 parts by weight of at least one C12 to C40 alkyl ester of (meth)acrylic acid, b) from 4 to 79 parts by weight of at least one ethylenically unsaturated monomer, and c) from 1 to 10 parts by weight of at least one ethylenically unsaturated acid containing monomer or salts thereof.
1 more element
A method of protecting gypsum wallboard comprising:
- 1) admixing from 0.5 to 20 parts by weight of a polymer with from 80 to 99.5 parts by weight calcium sulfate and water;
- 2) molding the admixture to form a gypsum wallboard;
- and
- 3) drying the gypsum wallboard;
- wherein the polymer includes as polymerized units:
- a) from 20 to 95 parts by weight of at least one C12 to C40 alkyl ester of (meth)acrylic acid, b) from 4 to 79 parts by weight of at least one ethylenically unsaturated monomer, and c) from 1 to 10 parts by weight of at least one ethylenically unsaturated acid containing monomer or salts thereof.
3 more elements
Dependencies are inferred from the claim text.