Sizing process and composition
AssigneeEthyl Corporation
InventorsSidney M. Blitzer, Harry D. Wilder
Life of this patent
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Abstract
Improved paper sizing is obtained by using water soluble salts of substitutes succinic acid having the formula: ##STR1## wherein R' is essentially hydrocarbon group of the formula ##STR2## wherein R is hydrogen or alkyl, at least two R groups being alkyl, and the total number of carbon atoms in R' is from 16 to about 26.
Claims16
The method of sizing paper which comprises the step of intimately dispersing within the wet pulp prior to the ultimate conversion of said pulp into a dry web as a sizing agent an effective amount of a system of alum plus alkali metal salt of substituted dicarboxylic acid corresponding to the structural formula ##STR14## wherein R is hydrogen or alkyl, at least two R groups being alkyl, and the total number of carbon atoms in the salt is from 20 to about 30, and wherein the amount of alum is up to about 1.7% by weight on a dry fiber basis and in an amount sufficient to provide superior sizing properties in comparison with succinic acid salts of said formula wherein the total number of carbon atoms in R' is less than 16.
A sized paper comprising a fibrous cellulosic web which has been internally sized with a water soluble salt of substituted succinic acid having the formula ##STR15## wherein R' is a hydrocarbon group of the formula ##STR16## wherein R is hydrogen or alkyl, at least two R groups being alkyl, and the total number of carbon atoms in R' is from 16 to about 26, and with alum, said alum being in an amount up to about 1.7% by weight on a dry fiber basis and in an amount sufficient to provide superior sizing properties in comparison with succinic acid salts of said formula wherein the total number of carbon atoms in R' is less than 16.
Dependencies are inferred from the claim text.