Patent ID: 7244339

Claim:
A process for the retention and drainage of a stock useful for the manufacturing of paper, paperboard, cardboard and other similar products, comprising the steps of: (1) adding into paper stock from about 40 to about 2,000 grams of a secondary retention and drainage agent, per ton of produced paper, that retains fines, colloidal and semi-colloidal particles, and organic and inorganic compounds present in the stock, the secondary retention and drainage agent having a composition comprising a de-laminated smectite, and consisting essentially of, by weight: (1) from about 1 to about 80% a dispersing agent selected from the group consisting of a polyacrylate, a purified sulpholignin, an extract of seaweed, a protein, a condensed fatty acid, a sulphonate ester, a high molecular weight alkyl sulphate, a polycarboxylic compound, a phosphate, a hexametaphosphate, pyrophosphate, and tripolyphosphate, a polyaspartic acid alkali salt, an alcohol, an acetone and other lower ketone, and glycerin, and mixtures thereof; (2) from about 8 to about 50% de-laminated smectite; and (3) from 0 to about 92% water; wherein the added secondary retention and drainage agent composition has a temperature in the range of from 5° to about 95° C.; and optionally, (2) adding a primary retention and drainage agent that flocculates the stock, the primary retention and drainage agent, selected from the group consisting of a linear, branched, or cross-linked polyacrylamide, a starch, a polyethylene oxide, a wet strength resin, a dry strength resin, an organic or inorganic coagulant, and a polyvinyl amine.