Paper quality improver composition for papermaking
First Claim
1. A process for producing a pulp sheet, which comprises adding a paper quality improver composition anytime before or in the papermaking step;
- wherein the paper quality improver composition comprises (A) a compound having a lyotropic degree, defined below, of not less than 4% and meeting at least two efficiencies selected from the following paper quality improving efficiencies (i) to (iii), (B) a water-soluble polymer satisfying at least one selected from an average molecular weight of 1000 to 10000000 and a viscosity of 1 to 4000 mPa·
s at 25°
C. in a 1% aqueous solution thereof and optionally at least one surfactant (C);
which composition is internally added before or in papermaking step;
(i) standard improved bulky value of not less than 0.02 g/cm3, (ii) standard improved brightness of not less than 0.5 point, and (iii) standard improved opacity of not less than 0.5 point; and
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Accused Products
Abstract
The present invention provides a paper quality improver composition for papermaking, which is excellent in improved efficiencies of bulky value, brightness, opacity and the like of pulp sheet, demanded at lightening paper and increasing a blending amount of deinked pulp, even by adding a small amount thereof as well as which is further excellent in an improved efficiency of paper-strength. That is, the present invention provides a paper quality improver composition for papermaking; which comprises (A) a compound having lyotropic degree measured by a specific method of not less than 4% and satisfying at least two of (i) standard improved bulky value of not less than 0.02 g/cm3, (ii) standard improved brightness of not less than 0.5 point, and (iii) standard improved opacity of not less than 0.5 point and (B) a water-soluble polymer satisfying an average molecular weight and/or a viscosity thereof of specific value.
22 Citations
11 Claims
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1. A process for producing a pulp sheet, which comprises adding a paper quality improver composition anytime before or in the papermaking step;
- wherein the paper quality improver composition comprises (A) a compound having a lyotropic degree, defined below, of not less than 4% and meeting at least two efficiencies selected from the following paper quality improving efficiencies (i) to (iii), (B) a water-soluble polymer satisfying at least one selected from an average molecular weight of 1000 to 10000000 and a viscosity of 1 to 4000 mPa·
s at 25°
C. in a 1% aqueous solution thereof and optionally at least one surfactant (C);
which composition is internally added before or in papermaking step;(i) standard improved bulky value of not less than 0.02 g/cm3, (ii) standard improved brightness of not less than 0.5 point, and (iii) standard improved opacity of not less than 0.5 point; and
- View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10)
- wherein the paper quality improver composition comprises (A) a compound having a lyotropic degree, defined below, of not less than 4% and meeting at least two efficiencies selected from the following paper quality improving efficiencies (i) to (iii), (B) a water-soluble polymer satisfying at least one selected from an average molecular weight of 1000 to 10000000 and a viscosity of 1 to 4000 mPa·
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6. A process for producing a pulp sheet, which comprises adding a paper quality improver composition anytime before or in the papermaking step;
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wherein the paper quality improver composition comprises (A) a compound having a lyotropic degree, defined below, of not less than 4% and meeting at least two efficiencies selected from the following paper quality improving efficiencies (i) to (iii), (B) a water-soluble polymer satisfying at least one selected from an average molecular weight of 1000 to 10000000 and a viscosity of 1 to 4000 mPa·
s at 25°
C. in a 1% aqueous solution thereof and optionally at least one surfactant (C);
which composition is internally added before or in papermaking step;
(i) standard improved bulky value of not less than 0.02 g/cm3, (ii) standard improved brightness of not less than 0.5 point, and (iii) standard improved opacity of not less than 0.5 point; and
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11. A process for producing a pulp sheet, which comprises adding a paper quality improver composition anytime before or in the papermaking step;
- wherein the paper quality improver composition comprises (A) a compound having a lyotropic degree, defined below, of not less than 4% and meeting at least two efficiencies selected from the following paper quality improving efficiencies (i) to (iii), (B) a water-soluble polymer satisfying at least one selected from an average molecular weight of 1000 to 10000000 and a viscosity of 1 to 4000 mPa·
s at 25°
C. in a 1% aqueous solution thereof and optionally at least one surfactant (C);
which composition is internally added before or in papermaking step;(i) standard improved bulky value of not less than 0.02 g/cm3, (ii) standard improved brightness of not less than 0.5 point, and (iii) standard improved opacity of not less than 0.5 point; and
- wherein the paper quality improver composition comprises (A) a compound having a lyotropic degree, defined below, of not less than 4% and meeting at least two efficiencies selected from the following paper quality improving efficiencies (i) to (iii), (B) a water-soluble polymer satisfying at least one selected from an average molecular weight of 1000 to 10000000 and a viscosity of 1 to 4000 mPa·
Specification