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Anionic-cationic polymer blend for surface size

Inactive Publication Date: 2005-02-03
GEORGIA PACIFIC CHEM LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] Paper sized with the composition of the present invention will typically exhibit acceptable resistance to penetration of ink and aqueous liquids, adequate surface smoothness and surprisingly improved surface strength, such that linting is reduced.
[0029] A polymer of this type is available from G-P Resins, Inc. under the Ambond® designation. One advantage of using such a material in the preparation of the sizing composition of the present invention is that a single component can provide the composition with both the required cationic agent as well as the film-forming binder component, described below in more detail.
[0034] The various components of the sizing composition are added to form the size press solution or dispersion in a sequence to prevent any reciprocal interaction in the starch dispersion. For example, in order to make a size-press composition using a slightly cationic starch according the present invention, the anionic polymer additive is first added to the slightly cationic starch solution followed by the cationic polymer additive. If the starch is slightly anionic, then the cationic polymer additive is added prior to adding the anionic polymer additive. A suitable sequencing of the addition of the various constituents of the sizing composition to prevent any reciprocal interaction can be determined by a skilled worker using only routine experimentation. Generally, the various components can be combined a short time before using the composition to size paper.

Problems solved by technology

The performance of many of these known sizing agents often is not entirely satisfactory for certain applications.
The accumulation of lint degrades the quality of the print job and lowers productivity as more frequent cleaning in required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0055] A base size press-solution includes 5.4% of a slightly anionic starch (Penford 280). In one case, an anionic polymer additive (NovaCote 1934) was added to the base solution. In another case, to the base starch solution was first added under stirring a cationic polymer additive (Amres 25 HP) and after 2 minutes the anionic polymer additive (NovaCote 1934) was added. The base paper used for sizing with each of the three compositions was a communication grade paper (15% ash) having a porosity (Gurley) of 16 seconds and an internal size (estimated by HST) of 2 seconds. The total pick up for each of the sizing compositions was 70 lb / ton. Based on this total pick-up, the calculated pick-ups for each of the sizing compositions are shown in Table 1. The drying temperatures were 103° C. Results of HST and Adams Wet Rub testing for each of the three samples are summarized in Table 1 below.

TABLE 1Adams Wet RubSAMPLEHST (sec.)(Turbidity units)Starch only (70 lbs / ton)1032NovaCote ® 1934...

example 2

[0056] Size-press compositions were obtained by repeating the procedures of Example 1 except that NovaCote PS2 anionic polymer was substituted for NovaCote 1934 and Ambond 1520 was substituted for Amres. Again, the total pick up for each of the sizing compositions was 70 lb / ton. Based on this total pick-up, the calculated pick-ups for each of the sizing compositions are shown in Table 2. Results of HST and Adams Wet Rub testing are summarized in Table 2 below.

TABLE 2Adams Wet RubSAMPLEHST (sec.)(Turbidity units)Starch only (70 lbs / ton)1032Starch (68 lbs / ton) + NovaCote PS25013(2.0 lb / T)Starch (68 lbs / ton) + Ambond 15201135(2.0 lb / T)Starch (66 lbs / ton) + NovaCote PS27410(2.0 lb / T) + Ambond 1520 (2.0 lb / T)

example 3

[0057] A base size press composition was prepared which contained 3.5% of a slightly anionic starch (Penford 280). In one case, a size press composition was prepared by additionally adding an anionic polymer additive (NovaCote 1934). In another case, to this base starch solution was first added under stirring a cationic polymer additive (Amres 25 HP) and after 2 minutes an anionic polymer additive (NovaCote 1934) was added. The base paper used with each of the three sizing compositions was a newsprint grade paper having a porosity (Gurley) of 40 seconds and an internal size (estimated by water drop method) of less than 1 second. The total solids pick-up from each of the sizing compositions was 55 lb / ton. Based on this total pick-up, the calculated pick-ups for each of the sizing compositions are shown in Table 3. The drying temperatures were 103° C. Results of sizing (water drop method) and of Adams Wet Rub testing for each of the sizing compositions are summarized in Table 3 below....

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Abstract

A composition for surface sizing and strengthening of paper and other cellulosic products and the related sizing method and resulting sized product, wherein the composition is an aqueous mixture of a film-forming binder, such as starch and an anionic polymer and a cationic polymer.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a surface size composition for cellulosic products, such as paper. The composition also improves paper surface strength. In particular, the invention relates to a surface size composition comprising a mixture of film-forming binder, such as starch, and a blend of an anionic polymer and a cationic polymer. DESCRIPTION OF RELATED ART [0002] Paper and other cellulosic products often are sized, i.e., are treated with a composition in order to improve those characteristics of the paper important for printing, such as surface porosity and hydrophobicity. Sizing typically influences absorption by the substrate of water, water-borne compositions, and inks. This effect, in turn, generates higher ink penetration time values, reduced lateral spread of printing inks, as well as improved imaging and contrast with various printing technologies. Thus, hydrophobic surface size agents improve printability primarily by decreasing paper sh...

Claims

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Application Information

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IPC IPC(8): D21H17/28D21H17/42D21H17/44D21H21/16D21H23/22
CPCD21H17/28D21H17/42D21H23/22D21H17/72D21H21/16D21H17/44
Inventor RODRIGUEZ, AUGUSTOHAGIOPOL, CORNEL
Owner GEORGIA PACIFIC CHEM LLC
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