Allied Colloids Limited

Ciba Specialty Chemicals Water Treatments Limited

Philip Anson Ford

John G Langley

Zhiqiang Song

Peter Lowry

Simon Donnelly

Brian Frederic Satterfield

Stephen Robert Tremont

Jean Cluyse

Laurence Rys

A process of preparing an aqueous composition comprising a polysilicate, wherein the composition is a substantially uniform liquid when measured at 25&#xb0; C., comprising the steps of, i) providing an aqueous liquid having a source of silicate, ii) adjusting the pH of the liquid to between about 2 and about 10.5, thereby causing polymerisation of the silicate, iii) allowing sufficient time for the polymerisation to proceed to substantial completion and thereby forming a product comprising gelled material, iv) subjecting the gelled material to sufficient shear to form a substantially uniform liquid. The novel aqueous composition made by this process is useful in the manufacture of paper and paperboard either as a mineral filler or as a retention/drainage aid.

Aqueous compositions and their use in the manufacture of paper and paperboard

The present invention relates to a method for controlling pitch and stickies deposit in a pulp and papermaking process using crosslinked cationic polymers made by controlled addition of a water soluble radical initiator at reaction temperature with agitation for chain extension and crosslinking.

Use of water-soluble crosslinked cationic polymers for controlling deposition of pitch and stickies in papermaking

A mill waste or deinking waste or other suspension containing cellulosic material and hydrophobic material is flocculated by a cationic polymeric flocculant and the flocculated material, is then aggregated by a swelling clay or other anionic colloidal material, optionally further cationic flocculant is added, and the aggregated material is then separated by belt pressing or other pressure filtration as a cake.

Dewatering of aqueous suspensions

Bentonite swelling clay is provided to a paper making mill as a fluid concentrate containing more than 15% bentonite wherein swelling of the bentonite is prevented by inorganic electrolyte in the concentrate, and the bentonite swells upon dilution either before addition of the cellulosic suspension or after addition.

Growing community of inventors

Suffolk, VA, United States of America

Philip Anson Ford