Method of making cationic pigment slurries
AssigneeMead Westvaco Corporation
InventorsRichard Y. Ryu, Jonathan L. Snover
Life of this patent
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Abstract
Cationically dispersed slurries of alumina pigments, which formed by a process including the combination of one or more alumina pigments, a nonionic wetting agent or nonionic polymer and a cationic interfacial modifier in an aqueous medium in the absence of an acid dispersant. The slurries may be used in a method of manufacturing paper and paperboard products.
Claims14
A method of making a stable aqueous cationic slurry of an alumina pigment without using an acid dispersant comprising the steps of:
- forming an aqueous mixture of alumina pigment, from about 0.5% to about 5% by weight of a nonionic wetting agent or nonionic polymer or combination thereof, from about 2% to about 15% by weight of a cationic interfacial modifier selected from the group consisting of cationic dispersants, cationic surfactants and combinations thereof, and water;
- and
- agitating the aqueous mixture to form a stable cationic pigment slurry having a solids content from about 42% by weight up to about 72% by weight based on the total weight of the slurry.
A stable aqueous cationic slurry of alumina pigment having a solids content, based on the total weight of the slurry, which is formed by a process comprising the steps of:
- forming an aqueous mixture of an alumina pigment, from about 0.5% to about 5% by weight of a nonionic wetting agent or nonionic polymer or combination thereof, from about 2% to about 15% by weight of a cationic interfacial modifier selected from the group consisting of cationic dispersants, cationic surfactants and combinations thereof, and water;
- and
- agitating the aqueous mixture to form a stable cationic pigment slurry having a solids content from about 42% up to about 72% by weight based on the total weight of the slurry.
A stable cationic pigment slurry for use in a coating color formulation comprising:
- an alumina pigment;
- from about 0.5% to about 5% by weight of a nonionic wetting agent or nonionic polymer or combination thereof;
- from about 2% to about 15% by weight of a cationic interfacial modifier selected from the group consisting of cationic dispersants, cationic surfactants and combinations thereof;
- water;
- and
- the slurry having a total solids content from about 42% up to about 72% by weight based on the total weight of the slurry.
A method of making a stable aqueous cationic slurry of fumed alumina comprising the steps of:
- forming an aqueous mixture of fumed alumina, from about 0.5% to about 5% by weight of a nonionic wetting agent or nonionic polymer or combination thereof, from about 2% to about 15% by weight of a cationic interfacial modifier selected from the group consisting of cationic dispersants, cationic surfactants and combinations thereof, lactic acid and water;
- and
- agitating the aqueous mixture to form a stable cationic slurry of fumed alumina having a solids content of from about 40% by weight to about 70% by weight.
Dependencies are inferred from the claim text.