Paint manufacture
AssigneeImperial Chemical Industries PLC
InventorDerek Norman Alfred Speakman
Life of this patent
Estimating the term…
Abstract
A pigment dispersant suitable for use in making a series of paints, the dispersant being a copolymer of defined proportions of ethylenically unsaturated monomers containing hydroxy and/or amide groups, straight or branched chain alkyl groups of from 7 to 22 carbon atoms and optionally also groupings which can promote association of the copolymer with a pigment surface. A millbase made with the aid of such a dispersant can be combined in either loading or tinting operations with a wide range of different film-forming polymers.
Claims12
A pigment dispersion suitable for use in making a series of paints comprising a pigment, an organic liquid and a pigment dispersant which is a copolymer comprising units derived from the following ethylenically unsaturated monomers in the stated proportions by weight based on the total weight of the copolymer:
- a. 0-50% of a hydroxy group-containing monomer, and/or
- b. 0-20% of an amide group-containing monomer, provided that there is always present at least 5% of (a) or (b);
- c. 20-80% of a monomer free from carboxyl groups and containing a straight or branched chain alkyl group of from 7 to 22 carbon atoms, and
- d. a component containing one or more monomers free from the groups mentioned in (a), (b), or (c), said
- component including as an essential constituent up to 20% based on the total weight of the copolymer of a comonomer containing an epoxide group, said epoxide group having been reacted with a compound bearing a carboxyl group and a pigment dispersant group and having the formula Ar ##STR3## where Ar is an aromatic group and n is 1 or 0, the total amount of said component (d) being up to 50% and the total of monomers being 100%.
A method of manufacturing paint which comprises combining the dispersion of claim 20 with a film-forming polymer selected from the group consisting of alkyd/melamine-formaldehyde blends, thermosetting acyrlic/epoxy blends, thermosetting acrylic/melamine-formaldehyde blends, nitrocellulose and acrylic lacquer-type polymers.
Dependencies are inferred from the claim text.