The process for the manufacture of an auto-oxidatively cross-linking hybrid polymer, in particular an aqueous hybrid polymer dispersion, comprises the step of reacting in a mini-emulsion process one or more ethylenically unsaturated monomers to form an addition polymer in the presence of a modified auto-oxidatively crosslinkable (AOC) polymer which has been modified with terminal unsaturated groups of the formula C(R1)CH2 wherein R1 is hydrogen, alkyl or aryl and wherein the AOC polymer is a hydrophobic polymer having an acid number between 5 to 30. The resulting aqueous hybrid polymer dispersion can be used for the manufacture of coating compositions, ink compositions or adhesives and coating compositions comprising the hybrid polymer dispersion as a binder.

There is provided a highly versatile curing accelerator for an oxidative polymerization-type unsaturated resin. There are also provided a printing ink and a coating material that use the above curing accelerator. Specifically, the curing accelerator for an oxidative polymerization-type unsaturated resin that is used contains a fatty acid manganese salt (A) and a compound (B) represented by formula (1) below, ##STR00001##
(wherein R.sup.1 and R.sup.4 are each a hydrogen atom, a hydrocarbon group, a hydrocarbonoxy group, or an amino group, R.sup.2 and R.sup.5 are each a hydrogen atom, a hydrocarbon group, a hydrocarbonoxy group, a hydrocarbonoxycarbonyl group, a cyano group, a nitro group, or a halogen atom, R.sup.3 and R.sup.6 are each a hydrogen atom or a hydrocarbon group, and R.sup.7 is a divalent hydrocarbon group, and wherein R.sup.1 and R.sup.2 may form a ring, and R.sup.4 and R.sup.5 may form a ring).

There is provided a highly versatile curing accelerator for an oxidative polymerization-type unsaturated resin. There are also provided a printing ink and a coating material that use the above curing accelerator. Specifically, the curing accelerator for an oxidative polymerization-type unsaturated resin that is used contains a fatty acid manganese salt (A) and a compound (B) represented by formula (1) below, ##STR00001##
(wherein R.sup.1 and R.sup.4 are each a hydrogen atom, a hydrocarbon group, a hydrocarbonoxy group, or an amino group, R.sup.2 and R.sup.5 are each a hydrogen atom, a hydrocarbon group, a hydrocarbonoxy group, a hydrocarbonoxycarbonyl group, a cyano group, a nitro group, or a halogen atom, R.sup.3 and R.sup.6 are each a hydrogen atom or a hydrocarbon group, and R.sup.7 is a divalent hydrocarbon group, and wherein R.sup.1 and R.sup.2 may form a ring, and R.sup.4 and R.sup.5 may form a ring).

A water-borne, urethane and acrylic modified alkyd dispersion, wherein the dispersion is substantially surfactant free and has less than 1 weight % volatile organic compounds (VOCs) is described. Additionally, a method for preparing a water-borne, substantially surfactant free, urethane and acrylic modified alkyd dispersion, with less than 1 weight % VOC, is described. In the method, an acrylic modified alkyd polymer is reacted with a basic compound in water to form an acrylic modified alkyd dispersion having a first viscosity and then a hydrophobic seed is added thereto to form a urethane and acrylic modified alkyd dispersion having a second viscosity, which is substantially less than the first viscosity.

An aqueous pigment composition contains a pigment, water, and an acrylic resin obtained by copolymerizing a silane coupling agent having an ethylenically unsaturated group and a polymerizable monomer having an amide group. Relative to a total amount of monomers used in copolymerization, the acrylic resin uses 0.05% by mass or more and not more than 2% by mass of the silane coupling agent having an ethylenically unsaturated group, and 0.5% by mass or more and not more than 5% by mass of the polymerizable monomer having an amide group.

An aqueous pigment composition contains a pigment, water, and an acrylic resin obtained by copolymerizing a silane coupling agent having an ethylenically unsaturated group and a polymerizable monomer having an amide group. Relative to a total amount of monomers used in copolymerization, the acrylic resin uses 0.05% by mass or more and not more than 2% by mass of the silane coupling agent having an ethylenically unsaturated group, and 0.5% by mass or more and not more than 5% by mass of the polymerizable monomer having an amide group.

[Problem] Provided is a photocurable electroconductive ink composition for screen printing which can provide printability, printing precision and adhesiveness on a substrate good enough for screen printing, and can show stable electroconductive properties.

[Solution] A photocurable electroconductive ink composition for screen printing, comprising: (A) an electroconductive filler, (B) a photopolymerizable resin precursor consisting of an oligomer of urethane acrylate, monofunctional acrylate and polyfunctional acrylate, (C) an alkyd resin, (D) two or more photopolymerization initiators and (E) a polymer dispersant, in which the content of the electroconductive filler (A) is 70 to 90 mass % relative to the total mass of the photocurable electroconductive ink composition, and more than 50 mass % of the electroconductive filler is silver powder in a scale-like, foil-like or flake-like form having a particle diameter at 50 % particle size distribution of 0.3 to 3.0 m, and the total content of the photopolymerizable resin precursor (B) is 10 to 24 mass % relative to the total mass of the photocurable electroconductive ink composition, and the content of the oligomer of urethane acrylate is 5 mass % or less relative to the total mass of the photocurable electroconductive ink composition, and the content of the alkyd resin (C) is 1 to 10 mass % relative to the total mass of the photocurable electroconductive ink composition.

[Problem] Provided is a photocurable electroconductive ink composition for screen printing which can provide printability, printing precision and adhesiveness on a substrate good enough for screen printing, and can show stable electroconductive properties.

[Solution] A photocurable electroconductive ink composition for screen printing, comprising: (A) an electroconductive filler, (B) a photopolymerizable resin precursor consisting of an oligomer of urethane acrylate, monofunctional acrylate and polyfunctional acrylate, (C) an alkyd resin, (D) two or more photopolymerization initiators and (E) a polymer dispersant, in which the content of the electroconductive filler (A) is 70 to 90 mass % relative to the total mass of the photocurable electroconductive ink composition, and more than 50 mass % of the electroconductive filler is silver powder in a scale-like, foil-like or flake-like form having a particle diameter at 50 % particle size distribution of 0.3 to 3.0 m, and the total content of the photopolymerizable resin precursor (B) is 10 to 24 mass % relative to the total mass of the photocurable electroconductive ink composition, and the content of the oligomer of urethane acrylate is 5 mass % or less relative to the total mass of the photocurable electroconductive ink composition, and the content of the alkyd resin (C) is 1 to 10 mass % relative to the total mass of the photocurable electroconductive ink composition.

An offset printing varnish, comprising a solvent, is provided. The solvent comprises at least one triglyceride with saturated monocarboxylic acid moieties, which solvent is preferably food safe.

An offset printing varnish, comprising a solvent, is provided. The solvent comprises at least one triglyceride with saturated monocarboxylic acid moieties, which solvent is preferably food safe.