OPTICAL BRIGHTENING AGENT COMPOSITION

Abstract

An optical brightening agent composition having an optical brightening agent, a dispersing agent and water. The optical brightening agent and the dispersing agent are triazine-stilbenes and methylene dinaphthalene sulfonates, respectively. Applications of an optical brightening agent composition for optically brightening paper or cardboards, optically brightening surfaces of paper or cardboards, and coating or adhesively pressing an optical brightening agent composition on paper or cardboards, are also provided.

Claims

1. An optical brightening agent composition which consists of water, a compound as shown in chemical formula (1), and sodium methylene dinaphthalene sulfonates: ##STR00005## wherein the sodium methylene dinaphthalene sulfonates are chemical compounds, as shown in chemical formula (2), chemical formula (3) or chemical formula (4): ##STR00006## R.sub.1 is a functional group, as shown in chemical formula (5), chemical formula (6), or chemical formula (7): ##STR00007## and R.sub.2 is a functional group, as shown in chemical formula (8), chemical formula (9), or chemical formula (10): ##STR00008##

2. The optical brightening agent composition as claimed in claim 1 wherein the compound as shown in chemical formula (1), the sodium methylene dinaphthalene sulfonates and water account for 20˜40%, 5˜25% and 35˜75% of total weight, respectively.

3. The optical brightening agent composition as claimed in claim 1 wherein the compound as shown in chemical formula (1), the sodium methylene dinaphthalene sulfonates and water account for 15˜40%, 2˜25% and 35˜83% of total weight, respectively.

4. The application of an optical brightening agent composition as claimed in claim 1 for optical brightening of paper or cardboards.

5. The application of an optical brightening agent composition as claimed in claim 4 for optical brightening of surfaces of paper or cardboards.

6. The application of an optical brightening agent composition as claimed in claim 4 for coating or adhesively pressing an optical brightening agent composition on paper or cardboards.

8. The application of an optical brightening agent composition as claimed in claim 5 in non-wood pulp or wood pulp.

9. A method of brightening paper, comprising each of a pulp suspension liquid, a pulp slurry suspension and pulp or a combination thereof, adding an optical brightening agent composition, as claimed in claim 1, in each of a pulp suspension liquid, a pulp slurry suspension and pulp or a combination thereof, and manufacturing as well as drying a piece of paper.

10. The method of brightening paper as claimed in claim 9 wherein the optical brightening agent composition which has been diluted by water is added into each of a pulp suspension liquid, a pulp slurry suspension and pulp or a combination thereof.

11. The method of brightening paper as claimed in claim 10 wherein the weight percentage concentration of the optical brightening agent composition diluted by water is 0.1%.

12. Paper or cardboards manufactured in a method of brightening paper as claimed in claim 9.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a bar graph which illustrates the effect of an optical brightening agent composition on GE Brightness in an embodiment.

[0014] FIG. 2 is a bar graph which illustrates the effect of an optical brightening agent composition on CIE Whiteness in an embodiment.

[0015] FIG. 3 is a bar graph which illustrates the effect of an optical brightening agent composition on GE Brightness in another embodiment.

[0016] FIG. 4 is a bar graph which illustrates the effect of an optical brightening agent composition on CIE Whiteness in another embodiment.

[0017] FIG. 5 is a bar graph which illustrates the effect of an optical brightening agent composition on GE Brightness in a further embodiment.

[0018] FIG. 6 is a bar graph which illustrates the effect of an optical brightening agent composition on CIE Whiteness in a further embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0019] The present disclosure offers an optical brightening agent composition. With weight percentage concentrations of ingredients adjusted, the optical brightening agent composition consists of an optical brightening agent (22% of total weight), a dispersing agent (5, 10 or 15% of total weight) and water. To prepare an optical brightening agent composition, a user has to evenly mix water and the optical brightening agent of triazine-stilbenes pro rata or agitate a concentrated solution for the optical brightening agent of triazine-stilbenes in which the dispersing agent is added simultaneously and further keep continuous stirring of both agents for homogeneous mixing. In detail, the optical brightening agent of triazine-stilbenes may comprise each of di-sulfonated triazine-stilbenes, tetra-sulfonated triazine-stilbenes and hexa-sulfonated triazine-stilbenes.

[0020] Referring to Table 1: Control Group 1, tetra-sulfonated triazine-stilbenes, in which no dispersing agent is added into the optical brightening agent, the triazine-stilbenes are chemical compounds, as shown in chemical formula (1), and the triazine-stilbenes are tetra-sulfonated triazine-stilbenes when R.sub.1 is a functional group as shown in chemical formula (6), where R.sub.2 is a functional group, as shown in chemical formula (9); Composition 1, Composition 2 and Composition 3 based on an optical brightening agent in the present disclosure, in which a dispersing agent (weight percentage concentration of 5, 10 and 15%, respectively) is added. With the compound of Control Group 1 (Composition 1, Composition 2 and Composition 3) diluted by water for preparation of solutions including three different weight percentage concentrations of 0.5, 1 and 1.5%, the solutions of Control Group 1 (Composition 1, Composition 2 and Composition 3) are added into pulp slurry suspensions for manufacture of paper and GE Brightness as well as CIE (Commission internationale de l'éclairage) Whiteness tests which are compared and shown in Table 1, FIG. 1 and FIG. 2. In detail, the dispersing agent is sodium methylene dinaphthalene sulfonates, as shown in chemical formula (2).

TABLE-US-00001 TABLE 1 Concentration GE CIE Composition (%) Brightness Whiteness Control group 1 0.5 90.34 86.03 (tetra-sulfonated 1 91.83 91.68 triazine-stilbenes) 1.5 93.12 97.20 Composition 1 0.5 90.48 86.73 (tetra-sulfonated triazine- 1 91.93 92.43 stilbenes + 5% dispersing 1.5 93.26 97.53 agent, as shown in chemical formula (2)) Composition 2 0.5 90.72 86.87 (tetra-sulfonated triazine- 1 92.17 92.63 stilbenes + 10% dispersing 1.5 93.46 97.77 agent, as shown in chemical formula (2)) Composition 3 0.5 90.77 87.31 (tetra-sulfonated triazine- 1 92.23 93.44 stilbenes + 15% dispersing 1.5 93.52 98.63 agent, as shown in chemical formula (2))

[0021] As shown in Table 1, Composition 1, Composition 2 and Composition 3 based on an optical brightening agent composition in the present disclosure, in which the dispersing agent (weight percentage concentration of 5, 10 and 15%, respectively) is added, have better performance in GE Brightness and CIE Whiteness than Control Group 1 (tetra-sulfonated triazine-stilbenes).

[0022] Referring to Table 2: Control Group 2, hexa-sulfonated triazine-stilbenes, in which no dispersing agent is added into the optical brightening agent, the triazine-stilbenes are chemical compounds, as shown in chemical formula (1), and the triazine-stilbenes are hexa-sulfonated triazine-stilbenes when R.sub.1 is a functional group as shown in chemical formula (7), where R.sub.2 is a functional group, as shown in chemical formula (10); Composition 4, Composition 5 and Composition 6 based on an optical brightening agent composition in the present disclosure, in which a dispersing agent (weight percentage concentration of 5, 10 and 15%, respectively) is added. With the compound of Control Group 2 (Composition 4, Composition 5 and Composition 6) diluted by water for preparation of solutions including three different weight percentage concentrations of 0.5, 1 and 1.5%, the solutions of Control Group 2 (Composition 4, Composition 5 and Composition 6) are added into starch pastes and evenly applied on base paper for drying, calendering, and GE Brightness as well as CIE Whiteness tests which are compared and shown in Table 2, FIG. 3 and FIG. 4. In detail, the dispersing agent is sodium methylene dinaphthalene sulfonates, as shown in chemical formula (3).

TABLE-US-00002 TABLE 2 Concentration GE CIE Composition (%) Brightness Whiteness Control group 2 0.5 89.30 94.10 (hexa-sulfonated 1 89.69 97.38 triazine-stilbenes) 1.5 90.83 100.47 Composition 4 0.5 89.35 94.19 (hexa-sulfonated triazine- 1 89.84 97.47 stilbenes + 5% dispersing 1.5 90.87 100.65 agent, as shown in chemical formula (3)) Composition 5 0.5 89.45 94.35 (hexa-sulfonated triazine- 1 89.87 97.93 stilbenes + 10% dispersing 1.5 90.89 100.74 agent, as shown in chemical formula (3)) Composition 6 0.5 89.41 94.37 (hexa-sulfonated triazine- 1 89.90 97.96 stilbenes + 15% dispersing 1.5 91.23 101.00 agent, as shown in chemical formula (3))

[0023] As shown in Table 2, Composition 4, Composition 5 and Composition 6 based on an optical brightening agent composition in the present disclosure, in which the dispersing agent (weight percentage concentration of 5, 10 and 15%, respectively) is added, have better performance in GE Brightness and CIE Whiteness than Control Group 2 (hexa-sulfonated triazine-stilbenes).

[0024] Referring to Table 3: Control Group 3, di-sulfonated triazine-stilbenes, in which no dispersing agent is added into the optical brightening agent, the triazine-stilbenes are chemical compounds, as shown in chemical formula (1), and the triazine-stilbenes are di-sulfonated triazine-stilbenes when R.sub.1 is a functional group as shown in chemical formula (5) where R.sub.2 is a functional group, as shown in chemical formula (8), or chemical formula (9); Composition 7, Composition 8 and Composition 9 based on an optical brightening agent composition in the present disclosure, in which a dispersing agent (weight percentage concentration of 5, 10 and 15%, respectively) is added. With the compound of Control Group 3 (Composition 7, Composition 8 and Composition 9) diluted by water for preparation of solutions including three different weight percentage concentrations of 0.5, 1 and 1.5%, the solutions of Control Group 3 (Composition 7, Composition 8 and Composition 9) are added into starch pastes and evenly applied on base paper for drying, calendering, and GE Brightness as well as CIE Whiteness tests which are compared and shown in Table 3, FIG. 5 and FIG. 6. In detail, the dispersing agent is sodium methylene dinaphthalene sulfonates, as shown in chemical formula (4).

TABLE-US-00003 TABLE 3 Concentration GE CIE Composition (%) Brightness Whiteness Control group 3 0.5 90.70 87.10 (di-sulfonated 1 92.17 91.37 triazine-stilbenes) 1.5 92.40 92.53 Composition 7 0.5 90.89 87.64 (di-sulfonated triazine- 1 92.35 91.91 stilbenes + 5% dispersing 1.5 92.53 92.75 agent, as shown in chemical formula (4)) Composition 8 0.5 91.12 87.90 (di-sulfonated triazine- 1 92.62 92.20 stilbenes + 10% dispersing 1.5 92.69 93.19 agent, as shown in chemical formula (4)) Composition 9 0.5 91.25 88.06 (di-sulfonated triazine- 1 92.72 92.31 stilbenes + 15% dispersing 1.5 92.79 93.29 agent, as shown in chemical formula (4))

[0025] As shown in Table 3, Composition 7, Composition 8 and Composition 9 based on an optical brightening agent composition in the present disclosure, in which the dispersing agent (weight percentage concentration of 5, 10 and 15%, respectively) is added, have better performance in GE Brightness and CIE Whiteness than Control Group 3 (di-sulfonated triazine-stilbenes).

[0026] Many changes and modifications in the above described embodiment of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.