Dispersions
AssigneeImperial Chemical Industries PLC
InventorsJames F. Stansfield, James Toole, Arthur Topham
Life of this patent
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Abstract
A dispersion of a particulate solid in a polar organic medium in the presence of a dispersing agent which is a tertiary amine or a salt thereof with a mineral acid or an aromatic carboxylic or sulphonic acid, the amine containing at least one polymeric group which is a poly(lower alkylene oxy) chain or a poly(carbonyl lower alkylene oxy) chain and inks, paints and similar formulations made from such a dispersion.
Claims10
A process for the preparation of a dispersion of an inorganic pigment in a polar organic medium, said process consisting essentially of grinding the pigment in the polar organic medium in the presence of a dispersing agent, in which the dispersing agent is a tertiary amine of the formula:
- ##STR5## wherein each of A, B and D independently represents ##STR6## wherein each X independently represents an oxygen or a nitrogen atom provided that, where X is oxygen m+n=1 and p=1 and where X is nitrogen m+n=2 and p is from 1 to 30;
- each Q independently represents alkyl or --YH;
- and each Y independently represents a poly(lower alkylene oxy) chain containing from 3 to 50 lower alkylene oxy groups provided that, (i) at least one of A, B and D contains a poly(lower alkylene oxy) chain, (ii) at least 50% of the lower alkylene groups in each poly(lower alkylene oxy) chain is propylene and (iii) not more than one of the alkylene or alkyl groups contains more than 8 carbon atoms;
- or the salt of said amine with a mineral acid or with an aromatic carboxylic or sulphonic acid.
A pigment dispersion consisting essentially of an inorganic pigment, a polar organic medium and a tertiary amine of the formula:
- ##STR7## wherein each of A, B and D independently represents ##STR8## wherein each X independently represents an oxygen or a nitrogen atom provided that, where X is oxygen m+n=1 and p=1 and where X is nitrogen m+n=2 and p is from 1 to 30;
- each Q independently represents alkyl or --YH;
- and each Y independently represents a poly(lower alkylene oxy) chain containing from 3 to 50 lower alkylene oxy groups provided that, (i) at least one of A, B and D contains a poly(lower alkylene oxy) chain, (ii) at least 50% of the lower alkylene groups in each poly(lower alkylene oxy) chain is propylene and (iii) not more than one of the alkylene or alkyl groups contains more than 8 carbon atoms;
- or the salt of said amine with a mineral acid or with an aromatic carboxylic or sulphonic acid.
Dependencies are inferred from the claim text.