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US 2004/0018367 A1Published application
Method for producing a curable aqueous polymer dispersion
AssigneeBASF SE
InventorsThomas Jaworek, Horst Binder, Wolfgang Paulus
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Abstract
The present invention provides a process for preparing a curable aqueous polymer dispersion, the polymer dispersion obtainable by said process, a coating composition comprising at least one such polymer dispersion, and a process for producing a coated substrate using such a polymer dispersion.
Claims13
A process for preparing a curable aqueous polymer dispersion by
- I) polymer-analogously reacting a (meth)acrylate copolymer A) having a number-average molecular weight Mn in the range from 1400 to 10 000 and a polydispersity of from 1 to 5.0, said copolymer A) carrying ethylenically unsaturated groups and functional groups capable of a condensation or addition reaction, with at least one compound B) which
- Ia) carries at least one functional group that is complementary to the functional groups of the copolymer A) that are capable of condensation or addition reaction, and additionally at least one ionogenic and/or ionic group, or which
- Ib) carries at least one functional group that is complementary to the functional groups of the copolymer A) that are capable of condensation or addition reaction and is capable of forming an ionogenic or ionic group in a condensation or addition reaction,
- to give a copolymer AI) which carries ethylenically unsaturated groups and ionogenic and/or ionic groups,
- II) where present, converting at least some of the ionogenic groups of the copolymer AI) into ionic groups, and
- III) dispersing the copolymer AI) in a dispersion medium.
3 more elements
A process as claimed in any of the preceding claims, wherein the (meth)acrylate copolymer A) used in step I) is obtainable by
- i) free-radically polymerizing a monomer mixture comprising
- a1) from 20 to 85 mol % of at least one monomer containing a radical of the formula
- CH2═C(R)—C(═O)—
- where R is H or CH3 and
- a2) from 15 to 80 mol % of at least one free-radically polymerizable monomer other than a1),
- from 5 to 50 mol % of the monomers a1) and/or a2), based on the overall amount of the monomers a1) and a2), carrying a functional group capable of a condensation or addition reaction, to give a copolymer Ai),
- ii) polymer-analogously reacting the copolymer Ai) with at least one ethylenically unsaturated compound C) which additionally carries at least one functional group complementary to the functional groups of the monomers a1) and/or a2) that are capable of condensation or addition reaction, to give a (meth)acrylate copolymer A).
4 more elements
Dependencies are inferred from the claim text.