Method of coating a shaped mineral article
AssigneeBASF SE
InventorsCheng-Le Zhao, Manfred Schwartz, Bertold Bechert, Harm Wiese, Wolfgang Hümmer
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Abstract
Aqueous formulations comprising as film-forming constituent at least one copolymer P, synthesized from ethylenically unsaturated monomers M, are used for coating shaped mineral articles, the copolymer P having a glass transition temperature in the range from −25 to +80° C. and the monomers M comprising more than 0.2% by weight and up to 5% by weight, based on their overall weight, of itaconic acid as monomer M1.
Claims9
A method of coating a shaped mineral article, which comprises applying an aqueous formulation comprising as a film-forming constituent at least one copolymer P, synthesized from ethylenically unsaturated monomers M, the copolymer P having a glass transition temperature Tg in the range from −25 to +80° C. and the monomers M comprising
- 0.5 to 3% by weight, based on the overall weight of the monomers M, of itaconic acid as monomer M1,
- 95 to 99.5% by weight, based on the overall weight of the monomers M, of at least two further monomers M2 and M3, wherein M2 is methylmethacrlate and monomer M3 is n-butylacrylate, and
- 0 to 4.8% by weight, based on the overall weight of the monomers M, of at least one further monomer M4 selected from the group consisting of acrylamide and methacrylamide, provided that the total content of M1 and M4 does not exceed 5% by weight,
- to at least one of the surfaces of the shaped article and then drying it.
Dependencies are inferred from the claim text.