Polyester/acrylic hybrid latexes for printing inks with improved rewettability

Claim 1

An aqueous dispersion comprising: (A) a polyester having carbonyloxy linking groups in a linear molecular structure wherein up to 80% of the linking groups may be carbonylamido linking groups, said polyester comprising the reaction products of: (1) at least one difunctional aromatic, saturated aliphatic or saturated alicyclic dicarboxylic acid; (2) at least one difunctional sulfomonomer containing at least one metal sulfonate group attached to aromatic nucleus wherein the functional groups are hydroxy or carboxyl present in an amount from about 4 to about 25 mol %, based on a total of all acid and hydroxyl equivalents being equal to 200 mol %; (3) at least one difunctional reactant selected from a glycol or a mixture of a glycol and diamine having two --NRH groups, the glycol containing two --CH 2 --OH groups; and (4) optionally, a difunctional reactant selected from a hydroxycarboxylic acid having one --CR 2 --OH, an aminocarboxylic acid having one --NRH group, an aminoalcohol having one --CR 2 --OH group and one --NRH or mixtures thereof, wherein each R is an H atom or an alkyl group of 1 to 4 carbon atoms; and (B) a polymer having repeat units from: (1) about 20 to about 80% by weight of styrene or one or more derivatives of styrene; (2) about 7.5 to about 48% by weight of a hydroxy(alkyl)methacrylate selected from the group consisting of 2-hydroxyethylmethacrylate, hydroxyethylacrylate, and hydroxypropylacrylate; (3) about 2 to about 25% by weight of a carboxyl group containing monomer selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid and mixtures thereof; and (4) optionally, about 0 to about 60% by weight of alkyl(meth)acrylate; said aqueous dispersion containing about 5-40% of polyester (A) and about 95-60% of polymer (B), both percentages being based on the combined weights of polyester (A) and polymer (B).

Claim 17

A method for coating a substrate with an aqueous dispersion comprising steps of: (i) forming an aqueous dispersion, comprising: (A) a polyester having carbonyloxy linking groups in a linear molecular structure wherein up to 80% of the linking groups may be carbonylamido linking groups, said polyester comprising the reaction products of: (1) at least one difunctional aromatic, saturated aliphatic or saturated alicyclic dicarboxylic acid; (2) at least one difunctional sulfomonomer containing at least one metal sulfonate group attached to aromatic nucleus wherein the functional groups are hydroxy or carboxyl present in an amount from about 4 to about 25 mol %, based on a total of all acid and hydroxyl equivalents being equal to 200 mol %; (3) at least one difunctional reactant selected from a glycol or a mixture of a glycol and diamine having two --NRH groups, the glycol containing two --CH 2 --OH groups; and (4) optionally, difunctional reactant selected from a hydroxycarboxylic acid having one --CR 2 --OH, an aminocarboxylic acid having one --NRH group, an aminoalcohol having one --CR 2 --OH group and one --NRH or mixtures thereof, wherein each R is an H atom or an alkyl group of 1 to 4 carbon atoms; and (B) a polymer having repeat units from: (1) about 20 to about 80% by weight of styrene or one or more derivatives of styrene; (2) about 7.5 to about 48% by weight of a hydroxyalkyl(meth)acrylate selected from the group consisting of 2-hydroxyethylmethacrylate, hydroxyethylacrylate, and hydroxypropylacrylate; (3) about 2 to about 25% by weight of a carboxyl group containing monomer selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid and mixtures thereof; and (4) optionally, about 0 to about 60% by weight of alkyl(meth)acrylate; said aqueous dispersion containing about 95-60% of polymer (B) and about 5-40% of polyester (A), both said percentages being based on the combined weight of (A) and (B); and (ii) coating said substrate with said aqueous dispersion.

Claim 18

A method for coating a substrate with an aqueous dispersion comprising steps of: (i) forming an aqueous dispersion, comprising: (A) a polyester having carbonyloxy linking groups in a linear molecular structure wherein up to 80% of the linking groups may be carbonylamido linking groups, said polyester comprising the reaction products of: (1) at least one difunctional aromatic, saturated aliphatic or saturated alicyclic dicarboxylic acid; (2) at least one difunctional sulfomonomer containing at least one metal sulfonate group attached to aromatic nucleus wherein the functional groups are hydroxy or carboxyl present in an amount from about 4 to about 25 mol %, based on a total of all acid and hydroxyl equivalents being equal to 200 mol %; (3) at least one difunctional reactant selected from a glycol or a mixture of a glycol and diamine having two --NRH groups, the glycol containing two --CH 2 --OH groups; and (4) optionally, difunctional reactant selected from a hydroxycarboxylic acid having one --CR 2 --OH, an aminocarboxylic acid having one --NRH group, an aminoalcohol having one --CR 2 --OH group and one --NRH or mixtures thereof, wherein each R is an H atom or an alkyl group of 1 to 4 carbon atoms; and (B) a polymer having repeat units from: (1) about 20 to about 80% by weight of styrene or one or more derivatives of styrene; (2) about 7.5 to about 48% by weight of a hydroxyalkyl(meth)acrylate selected from the group consisting of 2-hydroxyethylmethacrylate, hydroxyethylacrylate, and hydroxypropylacrylate; (3) about 2 to about 25% by weight of a carboxyl group containing monomer selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid and mixtures thereof; and (4) optionally, about 0 to about 60% by weight of alkyl(meth)acrylate; said aqueous dispersion containing about 95-60% of polymer (B) and about 5-40% of polyester (A), both said percentages being based on the combined weight of (A) and (B); and (ii) coating said substrate with said aqueous dispersion.