Ciba Specialty Chemicals Water Treatments Limited

Allied Colloids Limited

John Oliver Stockwell

Timothy Guy Bingham

Howard Roger Dungworth

Adrian Swinburn Allen

Michael Barry Heard

Gordon Cheng Chen

Ian James Black

John G Langley

Brian Frederic Satterfield

Paper is made by a dual soluble polymer process in which a cellulosic suspension which usually contains alum or cationic coagulant is first flocculated with a high IV cationic synthetic polymer or cationic starch and, after shearing, the suspension is reflocculated by the addition of a branched anionic water soluble polymer having IV above 3 dl/g and tan delta at 0.005 Hz of at least 0.5. The process gives an improved combination of formation, retention and drainage.

Anionic water soluble polymer made by reverse phase emulsion polymerization

Flexographic or other printed paper is deinked by a process which comprises pulping in the presence of an emulsion of crosslinked, insoluble, ionisable and swellable polymer particles. The emulsion preferably provides a viscosity (at 3%) in the ionised state of below 50,000 cps (Brookfiled RVT) and is novel.

Deinking processes polymers-in-water emulsion for use in deinking

Clay compositions and their use in paper making

Activation of swelling clays

Paper is made by a dual soluble polymer process in which a cellulosic suspension which usually contains alum or cationic coagulant is first flocculated with a high intrinsic viscosity cationic synthetic polymer or cationic starch and, after shearing, the suspension is reflocculated by the addition of a branched anionic water soluble polymer having an intrinsic viscosity above 3 dl/g and tan delta at 0.005 Hz of at least 0.5. The process gives an improved combination of formation, retention and drainage.

Processes of making paper

Flexographic or other printed paper is deinked by a process which comprises pulping in the presence of an emulsion of crosslinked, insoluble, ionisable and swellable polymer particles. The emulsion preferably provides a viscosity (at 3%) in the ionised state of below 50,000 cps (Brookfield RVT) and is novel.

Method for deinking printed paper using an emulsion of crosslinked,

Process of making paper

A process of de-inking waste paper can be operated under conditions using a simple combination of chemicals to result in a waste liquor that is substantially environmentally friendly. The process comprises forming a pulp from the waste paper in a aqueous medium that has a pH of between 6 and 9 and that is substantially free of dissolved phosphate and that includes an ink-dispersing amount of polycarboxylic acid dispersing agent, and separating the ink from the pulp. The use of a cationic surfactant for promoting flotation is particularly desirable.

Treatment of cellulosic material and compositions for use in this

According to the invention, a process of making paper comprises forming a cellulosic suspension, adding retention aid to the suspension, draining the suspension through a screen to form a sheet, and drying the sheet and in this process we add to the suspension a retention system comprising polyethylene oxide and a greater amount (dry weight) of a phenolsulphone-formaldehyde resin (PSR resin) consisting essentially of recurring units of the formula

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West Yorkshire, United Kingdom

John Oliver Stockwell