Pigment preparation
AssigneeAkzo Nobel Coatings International B.V.
InventorsJamie MacLiver Roy, Hendrik Jan Willem Van Den Haak, Roger Francis Graham Brown
Life of this patent
Estimating the term…
Abstract
The invention relates to a solid pigment preparation comprising a pigment and a dispersant resin, wherein the composition comprises at least 35% by weight of at least one pigment and at most 65% by weight of dispersant resin, calculated on the combined weight of pigment and dispersant resin, wherein the dispersant resin comprises a polymer backbone produced by chain-reaction polymerization having pendent hydrophilic polyalkylene oxide side groups, and wherein the pigment particles within the preparation have average particle sizes in the range of 50 nm to 5,000 nm.
Claims20
A solid pigment preparation in the form of granules, powder, pellets or tablets, the solid pigment preparation comprising pigment particles and a dispersant resin, wherein the preparation comprises at least 35% by weight of the pigment particles and at most 65% by weight of the dispersant resin, calculated on the combined weight of pigment particles and dispersant resin, wherein the dispersant resin comprises a polymer backbone produced by chain-reaction polymerization having pendent hydrophilic alkylene oxide side groups and wherein the pigment dispersant resin is prepared by the reaction of
- (i) a hydrophilic alkylene oxide monoamine monoalkylether of the formula
- wherein R is hydrogen, R1 is selected from C1 to C4 alkyl groups, n is 0 to 25, m is 1 to 50, with the proviso that n+m≦50, and,
- (ii) a polymer backbone having cyclic carboxylic anhydride groups,
- wherein in a first reaction step the cyclic carboxylic anhydride is opened by the amine group of the hydrophilic alkylene oxide monoamine monoalkylether to form an amide group and a carboxylic acid group (amic acid group), and wherein at least part of the amic acid forms an imide in a second reaction step,
- wherein the pigment particles within the preparation have an average particle size in the range of 50 nm to 5,000 nm.
A process for preparing a solid pigment preparation in the form of granules, powder, pellets or tablets, the process comprising the steps of
- a) stirring a pigment and a dispersant resin to form a fluidized pigment slurry, and
- b) drying the slurry,
- wherein the dispersant resin comprises a polymer backbone produced by chain-reaction polymerization having pendent hydrophilic alkylene oxide side groups wherein the pigment dispersant resin is prepared by the reaction of
- (i) a hydrophilic alkylene oxide monoamine monoalkylether of the formula
- wherein R is hydrogen, R1 is selected from C1 to C4 alkyl groups, n is 0 to 25, m is 1 to 50, with the proviso that n+m≦50, and,
- (ii) a polymer backbone having cyclic carboxylic anhydride groups,
- wherein in a first reaction step the cyclic carboxylic anhydride is opened by the amine group of the hydrophilic alkylene oxide monoamine monoalkylether to form an amide group and a carboxylic acid group (amic acid group), and wherein at least part of the amic acid forms an imide in a second reaction step.
A method of preparing a solid stir-in pigment preparation in the form of granules, powder, pellets or tablets, the method comprising adding a dispersant resin to a pigment wherein the dispersant resin comprises a polymer backbone produced by chain-reaction polymerization having pendent hydrophilic alkylene oxide side groups wherein the pigment dispersant resin is prepared by the reaction of
- (i) a hydrophilic alkylene oxide monoamine monoalkylether of the formula
- wherein R is hydrogen, R1 is selected from C1 to C4 alkl groups, n is 0 to 25, m is 1 to 50, with the proviso that n+m≦50, and,
- (ii) a polymer backbone having cyclic carboxylic anhydride groups,
- wherein in a first reaction step the cyclic carboxylic anhydride is opened by the amine group of the hydrophilic alkylene oxide monoamine monoalkylether to form an amide group and a carboxylic acid group (amic acid group), and wherein at least part of the amic acid forms an imide in a second reaction step.
Dependencies are inferred from the claim text.