Inorganic particles
AssigneeImperial Chemical Industries PLC
InventorsRichard Buscall, Paul J. Scales, Serena J. Williams, Jill E. Newton
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Abstract
A method for the preparation of colloidally stable particles of inorganic solid at high concentration which method comprises at least the step of precipitating from an aqueous medium the particles of the inorganic solid in the presence of a copolymer which comprises repeating units derived from: Component A: a hydrophilic oligomer or polymer bearing an addition-polymerizable olefinically-unsaturated group; Component B: an olefinically-unsaturated compound capable of copolymerizing with Component A and bearing a mineral acid group or a dicarboxylic acid group, or a carboxylic acid and a further group capable of hydrogen-bonding.
Claims17
A method for the preparation of a particulate inorganic solid which method comprises at least the step of precipitating from an aqueous medium the particles of the inorganic solid in the presence of a copolymer which comprises repeating units which are derived from:
- Component A:
- a hydrophilic oligomer or polymer bearing an addition-polymerisable olefinically-unsaturated group;
- Component B:
- an olefinically-unsaturated compound capable of copolymerising with Component A and bearing
- i) a monobasic acid group or
- ii) a dibasic acid group or
- iii) a moiety bearing both a carboxylic acid group and a further group capable of involvement in hydrogen bonding therewith.
A particulate inorganic solid wherein a copolymer is absorbed on the particles and wherein the copolymer comprises repeating units which are derived from:
- Component A:
- a hydrophilic oligomer or polymer bearing an addition-polymerisable olefinically-unsaturated group;
- and
- Component B:
- an olefinically unsaturated compound capable of copolymerising with Component A and bearing
- (i) a monobasic acid group or
- (ii) a dibasic acid group or
- (iii) a moiety bearing both a carboxylic acid group and a further group capable of involvement in hydrogen-bonding therewith.
Dependencies are inferred from the claim text.