Method of enhancing the opacity of printing papers and paper produced thereof
AssigneeSequa Chemicals, Inc.
InventorsLouis Robert Dragner, Bernard North
Life of this patent
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Abstract
A chemical composition for use in the papermaking process to produce a paper having enhanced opaqueness is provided. The process using the composition to make the paper and the paper made therefrom are also provided by the present invention. The composition contains an alkyl bis (alkyl amido alkyl)-2-hydroxy alkyl ammonium alkyl salt.
Claims17
A method of producing printing paper with enhanced opaqueness consisting essentially of the steps of:
- providing a pulp slurry of cellulose fibers;
- adding to said slurry a composition in an amount effective to enhance opaqueness of the paper produced comprising the salt of a hydroxylated diamido amine having the general formula:
- ##STR2## wherein each R.sub.1 represents the same or different C.sub.4 -C.sub.22 alkyl, alkenyl or hydroxy alkyl group, wherein each R.sub.4 represents the same or different C.sub.2 -C.sub.6 alkylene group, wherein R.sub.2 represents a C.sub.1 -C.sub.4 alkyl or a benzyl group, wherein R.sub.3 represents a C.sub.2 -C.sub.4 alkylene group and wherein n is a number from 0 to 20;
- forming said slurry into said paper;
- and
- calendering the formed paper.
A printing paper product made from cellulose fibers having enhanced opaqueness, said product having a composition therein in an amount effective to enhance opaqueness of the paper produced consisting essentially of the salt of a hydroxylated diamido amine having the general formula:
- ##STR3## wherein each R.sub.1 represents the same or different C.sub.4 -C.sub.22 alkyl, alkenyl or hydroxy alkyl group, wherein each R.sub.4 represents the same or different C.sub.2 -C.sub.6 alkylene group, wherein R.sub.2 represents a C.sub.1 -C.sub.4 alkyl or a benzyl group, wherein R.sub.3 represents a C.sub.2 -C.sub.4 alkylene group and wherein n is a number from 0 to 20, and wherein said paper having been calendared.
Dependencies are inferred from the claim text.