Patent GB-1095285-A (GB)
Title: Improvements in or relating to coating compositions
Inventor: SOAR DENIS GODFREY
IPC: C09D7/45
Filed: 1963-07-03
Abstract: A pigmented coating composition comprises an organic vehicle having dispersed therein a pigment and a cationic modified clay in an amount sufficient to reduce the settlement of the pigment, the cationic clay immediately prior to modification having a base exchange capacity of less than 50 milli-equivalents per 100 gm. of clay and having been reacted with a salt of a base having in the cation at least one organic hydrophobic group linked by a covalent link to an atom having a valency of at least three and said composition having a viscosity such that <FORM:1095285/C4-C5/1> where Vo is the viscosity of the pigmented but clay-free composition, Va is the viscosity of the pigmented composition having dispersed therein a known proportion by weight of a cationic modified clay used in accordance with the invention and Vb is the viscosity of the pigmented composition having dispersed therein the same proportion by weight of a cationic modified bentonite clay which has been modified with the same salt of the same base to an equal percentage of its base exchange capacity, all viscosities being determined upon a Stormer viscometer.  The organic vehicle of the composition may be a drying oil, a medium- or long-oil-modified alkyd resin, an unsaturated polyester resin, a cellulose ester or ether or a vinyl acetate polymer; or a thermosetting material such as dimethylol urea, a condensate thereof, dimethylol ethylene urea, polymethylol melamine or an ether thereof containing at least 2 reactive methylol groups, urea-melamineformaldehyde condensate or phenol-formaldehyde condensate.  Chlorinated rubber, epoxy resin prepolymers or bituminous materials may also be used.  Numerous organic and inorganic pigments, also carbon black, may be used.ALSO:A pigmented coating composition comprises an organic vehicle having dispersed therein a pigment and a cationic modified clay in an amount sufficient to reduce the settlement of the pigment, the cationic clay immediately prior to modification having a base exchange capacity of less than 50 milli-equivalents per 100 gm. of clay and having been reacted with a salt of a base having in the cation at least one organic hydrophobic group linked by a covalent link to an atom having a valency of at least three and said composition having a viscosity such that <FORM:1095285/C3/1> where Vo is the viscosity of the pigmented but clay-free composition, Va is the viscosity of the pigmented composition having dispersed therein a known proportion by weight of a cationic modified clay used in accordance with the invention and Vb is the viscosity of the pigmented composition having dispersed therein the same proportion by weight of a cationic modified bentonite clay which has been modified with the same salt of the same base to an equal percentage of its base exchange capacity, all viscosities being determined upon a Stormer viscometer.  The organic vehicle of the composition may be a drying oil, a medium- or long-oil-modified alkyd resin, an unsaturated polyester resin, a cellulose ester or ether or a vinyl acetate polymer; or a thermosetting material such as dimethylol urea, a condensate thereof, dimethylol ethylene urea, polymethylol melamine or an ether thereof containing at least 2 reactive methylol groups, urea-melamine-formaldehyde condensate.  Chlorinated rubber, epoxy resin prepolymers or bituminous materials may also be used. Numerous organic and inorganic pigments, also carbon black, may be used.