Wet strength and softness enhancement of paper products

a technology of wet strength and paper towels, applied in papermaking, non-fibrous pulp addition, reinforcing agent addition, etc., can solve the problems of undissolved cmc, inability to absorb wet strength, so as to achieve the effect of less additives and increased wet strength

Inactive Publication Date: 2006-06-15
KOKKO BRUCE J +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] The method advantageously increases the wet strength and the wet / dry tensile strength ratio while using less additive. Also, the hydrophobically modified anionic polyelectrolyte disclosed herein provides a liquid substitute for CMC as well as being a molecular carrier for non-ionic softeners such as Guerbet alcohols.

Problems solved by technology

Although CMC is effective it suffers from disadvantages.
In particular, CMC requires the installation of expensive equipment, and undissolved CMC can form deposits which interfere with the operation of the paper making machinery.
However, surfactant molecules are relatively small and do not easily remain on the surface of the paper fibers because they are poorly retained and have a tendency to migrate into the fiber walls, thereby losing effectiveness.
Also, surfactants can reduce wet strength as well as dry strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] British handsheets were prepared to a target basis weight of about 55 g / m2 using an unrefined furnish of 1:1 bleached hardwood and softwood Kraft pulps. A number of tests were preformed in which tests designated as D-1 and D-2 were in accordance with the present invention and the remaining tests were for comparison purposes. The test results are set forth in table below. In each test, to prepare the handsheets 10 g of fibers at 3% consistency were treated for 5 minutes with a selected dosage of AMRES LA-12 PAE wet strength (W.S.) resin as a 1% aqueous-solution. In tests A-1, A-2, C-1, C-2, D-1, D-2, and E-1, E-2, the dosage of Amres LA-12 was 20 pounds per metric ton (lbs / ton). In tests B-1, B-2, B-3, the dosage of Amres LA-12 was 8 lbs / ton.

[0039] The mixture was then diluted with 10 liters of tap water and the pH was adjusted to 7.5±0.2. Then, either CMC, HMAP, a non-hydrophobically modified anionic polyelectrolyte (“AP”), or nothing further, was added. In tests A-1, A-2, a...

example 2

[0048] British handsheets were prepared in accordance with the procedure set forth in Example I with a dosage of 20 lbs / ton Amres LA-12, except that the HMAP employed was a polyethylene-co-maleic anhydride polymer containing 7.8 mole percent octadecylamide units made in accordance with the following procedure:

[0049] A flask was charged with 7.29 g (0.059 mol) polyethylene-co-maleic anhydride, 1.22 g (0.0045 mmol) octadecylamine and 100 mL acetone, and heated at reflex with stirring over a two day period. The acetone was removed under vacuum and the solids were dissolved in a stirred solution of 4.37 g sodium chloride and 4.62 (0.12 mol) sodium hydroxide in 863 mL deionized water over a 24 hour period to yield a hazy viscous fluid having an active polymer solids content of 1.3% by weight. A dosage of 1.6 lbs / ton of the resulting HMAP was employed to prepare the handsheets.

[0050] The handsheets were tested in accordance with the procedures set forth in Example 1 and exhibited the fo...

example 3

[0051] British handsheets were prepared in accordance with the procedure set forth in Example 1 with a dosage of 20 lbs / ton Amres LA-12, except that the HMAP employed was prepared from a polyoctadecene-co-maleic anhydride polymer and alkali in accordance with the following procedure.

[0052] A beaker was charged Keith 2.24 g (0.56 mol) sodium hydroxide, 800 mL deionized water, and 10 g (0.0289 mol) polyoctadecene-co-maleic anhydride. The polyoctadecene-co-maleic anhydride was obtained from Sigma-Aldrich Chemical Co. under the product number designation 41,911-7. The slurry was stirred over a water bath at 70° C. for 3 hours to provide a clear, colorless solution having 1.496% by weight solids content. A dosage of 3.9 lbs / ton of the resulting HMAP was used to prepare the handsheets.

[0053] The handsheets were tested in accordance with the procedure set forth in Example 1 and exhibited the following properties.

Mutek charge−0.051 mLBasis weight56.5 g / m2Dry tensile3721 g / l″Dry breaking...

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Abstract

A method for making paper to enhance its wet strength includes adding separately to a cellulosic paper pulp furnish the following additives to form a treated pulp: a cationic wet strength resin whose cationic sites bond to anionic sites of cellulose fibers contained in the paper pulp furnish, and a hydrophobically modified anionic polyelectrolyte whose anionic sites bond with cationic sites of the cationic wet strength resin.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present disclosure relates generally to the field of making disposable paper products and, more specifically, to the enhancement of the softness and wet strength characteristics of paper tissue and towels. [0003] 2. Description of Related Art [0004] It is often desirable to increase the wet strength of paper products. For example, paper towels are typically used to wipe up wet spills and need sufficient strength when wet to prevent disintegration in use. Typically, wet strength is evaluated in relation to dry strength. A wet strength paper grade has a wet strength of at least about 10% to 15% of its dry strength. [0005] The wet strength of a paper can be enhanced by treating the paper pulp slurry, or “furnish”, with a reactive polymeric material such as polyamidoamine-epichilorohydrin (“PAE”), melamine-formaldehyde (“MF”) or urea-formaldehyde (“UF”) resins. [0006] PAE is commonly used. However, it has been found...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H23/00C08F8/30C08F8/32D21H17/43D21H17/64D21H21/20D21H21/22D21H23/76
CPCD21H17/43D21H17/64D21H17/71D21H21/22D21H23/765C08F8/32C08F210/02C08F8/44C08F222/06
Inventor KOKKO, BRUCE J.WHITE, DAVID W.
Owner KOKKO BRUCE J
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