Raisio Chemicals, Ltd.

Ciba Specialty Chemicals Corporation

Raision Tehtaat Oy Ab

Raisio Chemicals Limited UK

Tapio Vihervaara

Kari Luukkonen

Veikko Niinivaara

Claes Zetter

Martin Derek Phillipson

Michael James Jaycock

The object of the invention is an additive for paper making by means of which the dusting tendency of paper can be reduced. The agent is based on starch, the molecular size of which has been reduced, and which has been cationized to a charge of less than 1.5 meq/g with a quaternary nitrogen compound. The agent is added to the fiber pulp for paper making prior to web formation.

Additive for paper making

The object of the invention is an additive for paper making by means of which the dusting tendency of paper can be reduced. The agent is based on starch, the molecular size of which has been reduced, and which has been cationized to a charge of less than 1.5 mEkv/g with a quaternary nitrogen compound. The agent is added to the fiber pulp for paper making prior to web formation.

A &ldquo;one-shot&rdquo; composition for use in paper sizing comprises an admixture of a rosin emulsion, a soluble aluminium salt and a cationic starch derivative which has a charged state of 1.0 to 3.5 m equivalents per gramme and which is produced by a process in which the starch structure was split prior to the cationising step.

Rosin emulsion including starch derivative for paper sizing

Reducing level of interference chemicals in water circulation of

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Turku, Finland

Tapio Vihervaara