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Surface sizing with sizing agents and glycol ethers

a technology of surface sizing and glycol ether, which is applied in the field of fine paper improvement, to achieve the effect of improving ink-jet printing and improving ink-jet printing quality

Inactive Publication Date: 2008-07-10
HERCULES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]In general one embodiment of the invention involves a paper composition having applied to its surface a composition comprising a glycol ether based polymer that provides enhanced ink-jet print quality. The advantage of the paper composition is improved ink-jet printing without significant loss of water hold-out.
[0023]The paper of the invention has improved ink-jet print qualities of less mottle of printed areas, less strike-through of ink, and possibly increased optical density over paper not treated with all the components of the invention.
[0025]Any uncoated paper can be used, but a preferred paper is uncoated “fine” paper for printing and writing applications. Such paper typically contains bleached wood pulp, precipitated calcium carbonate, and starch along with other materials deemed beneficial for preparing the paper or enhancing paper properties or reducing the cost of the paper. A typical uncoated fine paper has a basis weight of 70 to 80 grams per square meter.

Problems solved by technology

However, the process of the patent requires the presence of a polyamine as a surface modifying agent and that the polyamine vaporize in the process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Demonstration of the Problem of Lowering Internal Sizing Levels When No Glycol Based Polymer is Present

[0081]Using the pilot paper machine process described earlier and the conditions listed here three different paper samples were prepared with different levels of internal sizing and only starch and sodium chloride applied at the size press. The sizing (liquid hold-out property) of the final paper was determined by the Hercules Sizing Test described above. The mottle and strike-through were determined on ink-jet printed black squares as described earlier.

[0082]The paper was made with 70:30 ratio of bleached craft hardwood and softwood as suitable for fine paper. 15% of a medium size precipitated calcium carbonate (Albacar 5970) was added based on the pulp solids. Likewise 0.75% cationic starch, 0.25% papermakers alum (Al2O3*14H20), 0.015% of an anionic polyacrylamide retention aid, and three different levels of alkyl succinic anhydride (ASA) sizing agent were added on the same basis...

example 2

Demonstration of the Problem of Increasing Surface Sizing Levels with No Glycol Based Polymer.

[0084]The same conditions of Example 1 were used. At the size press, Hercules imPress® ST900 sizing agent (ST900) was added along with the starch. ST900 is an emulsion containing alkenyl ketene dimer as a sizing agent. The levels of addition on a dry basis of the dimer to the final paper were 0 and 0.05%.

[0085]The results for sizing mottle and strike-through are listed in the following table. Adding some surface sizing increased the sizing but the mottle and strike-through were worse.

Sampledimer levelHST (sec)MottleStrike-Through1.035.8412.02.0.05018927.018.3

example 3

Addition of Premixed Polyethyleneglycol and Magnesium Chloride

[0086]Samples were prepared in the laboratory using a bench top size press and pre-made base sheet by the process described above. The base sheet contained 1.25# / ton of a solid AKD sizing agent applied as an emulsion (Hercules' Hercon® 70 sizing emulsion). It also contained 10% Albacar HO PCC filler. The compositions of the paper treatments applied at the size press were based on a 9% solution, in water, of a low viscosity oxidized starch (D-15F from Grain Processing Corporation). The pick-up of the base sheet of the starch solution was 54.0%. Therefore, the final paper contained approximately (54×0.09) / (100+(54×0.09)×100% or 4.64% starch. Addition levels of additives were based on this pick-up. To each formulation enough NaCl was added to give a final paper content of 0.25%. Enough reactive sizing agent, non-reactive sizing agent, glycol ether polymer and MgCl2 was added to give the desired levels of addition as listed i...

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Abstract

In this invention a composition is applied to the surface of paper comprising a glycol ether based polymer that provides enhanced ink-jet print quality. The advantage of using the composition is that it improves ink-jet printing on the paper without significant loss of water hold-out. More specifically, the paper is uncoated and has been treated on the surface with the following materials and dried to the point of usefulness. These materials are:1) one or more compounds that increase water hold-out. These are known as sizing agents,2) starch,3) A glycol ether based polymer.

Description

FIELD OF THE INVENTION[0001]This invention describes the improvement of uncoated fine paper by treatment of the surface of the paper with polymers based on glycol ethers used in combination with starch and paper sizing agents. The invention results in paper with enhanced ink-jet print quality. The enhanced qualities include less mottle on the printed images, less strike-through to the back side of the paper when printed, and enhanced optical density of printed images.BACKGROUND OF THE INVENTION[0002]Glycol ether based polymers including those end capped with epoxy groups have been added to paper for many years. As far back as at least 1972, U.S. Pat. No. 3,873,354A (1972) describes the addition of humectants along with salts, such as sodium chloride and calcium chloride, to paper to be used for electroreprographic (or electrostatic) printing, that is copy paper. The humectants named included “polyethylene glycols and polymers . . . ”. The humectant must be water soluble or water mis...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H21/16
CPCD21H17/16D21H17/17D21H21/16D21H19/60D21H19/54
Inventor VARNELL, DANIEL F.
Owner HERCULES INC
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