Ciba Specialty Chemicals Corporation

Guomei Peng

Kenneth Sundberg

Claes Zetter

Jouko Käki

John Roberts

Tiina Luttikhedde

A paper sizing composition, comprising at least one first sizing component dispersed in water, the said sizing component being prepared of a reaction product of a maleic anhydride and a fatty acid component, and an aluminium component. The fatty acid component comprises an alkyl ester of one or more fatty acids selected from a vegetable oil based fatty acid mixture. The particle size of the particles in said first sizing component has been reduced so that in the dispersion at least 50% of the particles are &#x3c;2.5 &#x3bc;m, at least 75% of the particles are &#x3c;4 &#x3bc;m and at least 90% of the particles are &#x3c;5 &#x3bc;m, preferably so that at least 50% of the particles are &#x3c;2 &#x3bc;m, at least 75% of the particles are &#x3c;3 &#x3bc;m and at least 90% of the particles are &#x3c;4 &#x3bc;m.

Product for use in papermaking and preparation thereof

The invention relates to the sizing of paper and board using alkenyl succinic anhydride (ASA). The invention provides a sizing composition which comprises an aqueous emulsion of an ASA wherein the ASA incorporates a maximum of 1% by weight (preferably a maximum of 0.5% by weight) of polymeric residues. The composition may incorporate less than 0.5% by weight of olefins. Paper sizing compositions in accordance with the invention provide enhanced resistance to penetration of the edges of paper and board by agents such as hot hydrogen peroxide and lactic acid.

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Shirley, United Kingdom

Guomei Peng