Rosin and fatty acid based pigment grinding aids for water-based ink formulations
AssigneeWestvaco Corporation
InventorsPaul J. LeBlanc, Peter Schilling
Life of this patent
Estimating the term…
Abstract
The invention is pigment grinding aids for water-based inks which are produced by reacting an unsaturated fatty acid and/or resin acid with either acrylic acid, metacrylic acid, fumaric acid, or maleic anhydride to form a polycarboxylic acid anhydride. The polycarboxylic acid anhydride is reacted with an excess of polyamine to produce an amidoamide or imidoamide intermediate. This intermediate is reacted with either acrylic acid or methacrylic acid to produce the grinding aid.
Claims10
A grinding base comprising ink pigments dispersed in a solution having a pH between 3 and 10 with a pigment grinding aid, said pigment grinding aid prepared by the steps comprising:
- (a) reacting 100 parts be weight of a member selected from the group consisting of an unsaturated fatty acid, a resin acid, and a combination thereof with 5 to 30 parts by weight of a member selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, and a combination thereof, in an "ene"-cyclocondensation reaction to form a polycarboxylic acid anhydride;
- (b) reacting 1 to 2.5 parts by weight of said polycarboxylic acid anhydride with 1 part by weight of polyamine to form an amidoamide or imidoamide reaction product;
- and
- (c) reacting 100 parts by weight of said reaction product with 10 to 30 parts by weight of a member selected from the group consisting of acrylic acid and methacrylic acid.
A grinding base comprising ink pigments dispersed in a solution having a pH between 3 and 10 with a pigment grinding aid, said pigment grinding aid prepared by the steps comprising:
- (a) reacting 100 parts of weight of a member selected from the group consisting of an unsaturated fatty acid, a resin acid, and a combination thereof with 5 to 30 parts by weight of a member selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, and a combination thereof, in a Diels-Alder reaction to form a polycarboxylic acid anhydride;
- (b) reacting 1 to 2.5 parts by weight of said polycarboxylic acid anhydride with 1 part by weight of polyamine to form an amidoamide or imidoamide reaction product;
- and
- (c) reacting 100 parts by weight of said reaction product with 10 to 30 parts by weight of a member selected from the group consisting of acrylic acid and methacrylic acid.
Dependencies are inferred from the claim text.