Dispersions for producing paint for concrete roof tiles, paint for concrete roof tiles and concrete roof tiles coated with such paint
AssigneeClariant GmbH
InventorsStephan Krieger, Klaus Zimmerschied, Erhard Lupprich
Life of this patent
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Abstract
The present invention provides copolymer-based compositions which are used to produce point for roof tiles, in order to prevent algal vegetation, crack formation, increased water absorption, as well as chipping off of the paint, more particularly on concrete roof tiles.
Claims15
A roof tile paint comprising:
- at least one color pigment;
- and
- a dispersion prepared using from 0.1 to 3 percent by weight (based on the total monomer content) of carboxymethylcellulose as a protective colloid emulsion polymerized in connection with a monomer composition including:
- a) from 85 to 99.8% by weight of acrylic esters with C1 to C12 alkanols, methacrylic esters with C1 to C12 alkanols and/or vinylaromatic monomers, and
- b) from 0.2 to 5% by weight of copolymerizable carboxylic acids, carboxamides, sulfates and/or sulfonates.
The roof tile paint as claimed in at least one of the preceding claims, wherein said protective colloid is a water-soluble carboxymethylcellulose whose 2% strength aqueous solutions possess a Brookfield viscosity at 25° C. and 20 rpm of less than 2000 (with spindle 3).
The roof tile paint as claimed in at least one of the preceding claims, wherein the emulsion polymerization is conducted using less than 1% by weight of a regulator.
The roof tile paint as claimed in at least one of the preceding claims, wherein the dispersion comprises from 0.1 to 2% by weight of a dispersant.
A roof tile composite comprising:
- a roof tile;
- and
- a paint composition coated on at least one surface of said roof tile said paint composition including
- at least one color pigment;
- and
- a dispersion prepared using from 0.1 to 3 percent by weight (based on the total monomer content) of carboxymethylcellulose as a protective colloid emulsion polymerized in connection with a monomer composition including:
- a) from 85 to 99.8% by weight of acrylic esters with C1 to C12 alkanols, methacrylic esters with C1 to C12 alkanols and/or vinylaromatic monomers, and
- b) from 0.2 to 5% by weight of copolymerizable carboxylic acids, carboxamides, sulfates and/or sulfonates.
A method for making a roof tile paint comprising the step of adding a binder to a paint composition, wherein said binder includes
- carboxymethylcellulose as a protective colloid and is emulsion polymerized with a monomer composition comprising
- a) from 85 to 99.8% by weight of acrylic esters with C1 to C12 alkanols, methacrylic esters with C1 to C12 alkanols and/or vinylaromatic monomers, and
- b) from 0.2 to 5% by weight of copolymerizable carboxylic acids, carboxamides, sulfates and/or sulfonates.
A dispersion comprising 0.1 to 3, percent by weight (based on the total monomer content) of carboxymethylcellulose as a protective colloid, emulsion polymerized with a monomer composition comprising:
- a) from 85 to 99.8% by weight of acrylic esters with C1 to C12 alkanols, methacrylic esters with C1 to C12 alkanols and/or vinylaromatic monomers, and
- b) from 0.2 to 5% by weight of copolymerizable carboxylic acids, carboxamides, sulfates and/or sulfonates, wherein said emulsion polymerization is conducted at a pH >3.
Dependencies are inferred from the claim text.