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US 2015/0353771 A1Published application
Coating compositions with an aqueous dispersion containing a polyurethane and an acid reactive crosslinking agent
AssigneeBayer MaterialScience AG
InventorMargaret A. Kendi
Life of this patent
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Abstract
Disclosed are coating compositions that include an aqueous dispersion that includes an aliphatic, fatty-acid containing, anionic polyurethane and an acid-reactive crosslinking agent. Also disclosed are uses of such coating compositions, such as in the coating of plastic, such as vinyl substrates.
Claims28
A coating composition comprising:
- (A) an aqueous dispersion comprising:
- (i) an aliphatic, fatty-acid containing, anionic polyurethane;
- and
- (ii) an acid-reactive crosslinking agent comprising a compound comprising epoxy, carbodiimide, aziridine and/or oxazoline groups, and
- (B) a coalescing agent having an evaporation rate of less than 0.8 (n-butyl acetate=1.0) that is present in an amount of at least 2 percent by weight, based on the total weight of the coating composition.
2 more elements
A coating composition comprising:
- (A) an aqueous dispersion comprising:
- (i) an aliphatic, fatty-acid containing, anionic polyurethane polyurethane having a hard segment content of 40 to 60% by weight, based on the total weight of the polyurethane, and comprising a reaction product of reactants comprising:
- (1) a polyisocyanate;
- (2) at least two polymeric polyols having a number average molecular weight of 500 to 6000 and comprising:
- (a) a fatty-acid containing polyester polyol that is a transesterification product of castor oil and soy bean oil;
- and
- (b) a polytetramethylene ether glycol;
- (3) a compound comprising at least one isocyanate-reactive group and an anionic group or potentially anionic group;
- (4) a compound with a molecular weight below 500 g/mol and comprising a polyol, an aminopolyol and/or a polyamine;
- and
- (5) a monoalcohol having a molecular weight of 32 to 145 g/mol and/or a monoamine having a molecular weight of 17 to 147 g/mol;
- wherein each of reactants (1)-(5) is different from each other;
- and
- (ii) an acid-reactive crosslinking agent comprising a compound comprising epoxy, carbodiimide, aziridine and/or oxazoline groups, and
- (B) a coalescing agent having an evaporation rate of less than 0.8 (n-butyl acetate=1.0) that is present in an amount of at least 2 percent by weight, based on the total weight of the coating composition,
- wherein the coating composition has a pot-life of at least 1 month.
13 more elements
Dependencies are inferred from the claim text.