Method of sizing and aqueous sizing dispersion
AssigneeEka Nobel AB
InventorsAnthony R. Colasurdo, Ian R. Hiskens, Nicholas S. Morgan, Karen J. Smith
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Abstract
The invention relates to a method of sizing paper and similar cellulose products containing precipitated calcium carbonate as a filler. According to the method, an aqueous suspension of pulp is dewatered and dried in the presence of an aqueous dispersion of a rosin-based sizing agent, which comprises a rosin component and a rosin ester component, and an aqueous dispersion of a cellulose-reactive sizing agent. The invention also relates to an aqueous dispersion of sizing agents which comprises a rosin-based sizing agent, which contains a rosin component and a rosin ester component, and a cellulose-reactive sizing agent.
Claims20
A method of sizing cellulose fiber based products containing precipitated calcium carbonate as a filler which comprises dewatering and drying an aqueous suspension of cellulose fiber containing pulp in the presence of an aqueous dispersion of a rosin-based sizing agent which comprises a rosin component and from 5 to 75% by weight based on the rosin-based sizing agent of a rosin ester component, and an aqueous dispersion of a cellulose-reactive sizing agent, wherein the weight ratio of rosin-based sizing agent to cellulose-reactive sizing agent is from 1:1 to 20:1, and forming said pulp into the desired cellulose fiber based product.
An aqueous dispersion of sizing agents which comprises a rosin-based sizing agent which comprises a rosin component and from 5 to 75 % by weight based on the rosin-based sizing agent of a rosin ester component, and a cellulose-reactive sizing agent, wherein the weight ratio of rosin-based sizing agent to cellulose-reactive sizing agent is from 1:1 to 20:1.
Dependencies are inferred from the claim text.