Creping paper using cationic water soluble addition
AssigneeRohm and Haas Company
InventorsJoseph J. Latimer, Travis E. Stevens
Life of this patent
Estimating the term…
Abstract
A procedure is disclosed for creping paper without conferring wet strength or sizing thereto.
Claims20
A method of creping a wet web of paper comprising the steps of applying 0.05% to 7% by weight of an addition polymer, based on bone dry paper, to the fibers of a paper web or paper pulp subsequently formed into a web of paper, said application being from an aqueous solution of said addition polymer, to give a wet web of paper, said polymer containing polymerized ethylenically unsaturated monomers (a) having amine salt units of the formula:
- ##STR9## as well as optional units of one or more of the formulas:
- ##STR10## and ##STR11## wherein R.sub.2 and R.sub.3 are lower alkyl having 1 to 4 carbon atoms, or together with the nitrogen atom form a heterocyclic ring, or optionally in formula XI are H,
- Y is an anion,
- X is iodine, bromine, or chlorine, and
- Z is a part of an addition polymer chain,
- and, optionally, containing units (b) other than those resulting from monomers yielding groups IX, X, and XI, from at least one monoethylenically unsaturated monomer VIII having a group of the formula:
- ##STR12## applying the wet web of paper to a hot drying surface, and doctoring said web from said surface at a point at which said web has dried to a moisture content of between 4% and 30%, whereby the paper web is adhered to the drying surface to an extent which enables the combined adherency and doctoring to achieve improved creping of the paper, the quantity of the amine units, before being converted to salt form, being such that the polymer is water soluble when converted into said salt form, said paper thereby being repulpable by virtue of the water solubility of the polymer salt.
A method of creping paper comprising the steps of incorporating in a paper web or paper pulp subsequently formed into a web of paper, 0.05% to 7% by weight based on pulp solids of a water soluble polymer salt, in aqueous solution, the polymer being derived from an addition polymerizable ethylenically unsaturated amine-containing monomer, and, where used, a compound of the formula:
- ##STR13## with or without a compound of the formula ##STR14## wherein R.sub.2 and R.sub.3 are lower alkyl having 1 to 4 carbon atoms, or together with a nitrogen atom form a heterocyclic ring,
- R is hydrogen or methyl,
- X is iodine, bromine, or chlorine,
- A is a (C.sub.2 -C.sub.6) alkylene group having at least two carbon atoms in a chain between the adjoined O and N atoms or A is a polyoxyethylene group of the formula:
- --(CH.sub.2 CH.sub.2 O).sub.x CH.sub.2 CH.sub.2 --
- wherein
- x is from 1 to 11, and
- Y is an anion
- optionally with at least one other monoethylenically unsaturated monomer VIII having a group of the formula:
- ##STR15## the quantity of the amine-containing monomer being such that the polymer is water-soluble when converted into an organic or inorganic acid salt of the amino component of the polymer, said paper being repulpable by virtue of the water solubility of the salt, in the case of pulp forming a web applying the wet web of said paper to a hot drying surface, and doctoring said web from said surface at a point at which said web contains a moisture content of between 4.0% and 30.0%, whereby the wet paper web is adhered to the drying surface to an extent which enables the combined adherency and doctoring to achieve improved creping of the paper, and the adsorbency being such that 0.1 ml. of water is adsorbed by the dry web in less than about 300 seconds.
Dependencies are inferred from the claim text.