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Paper quality improver composition for papermaking

  • US 6,565,708 B2
  • Filed: 12/19/2000
  • Issued: 05/20/2003
  • Est. Priority Date: 12/24/1999
  • Status: Expired due to Fees
First Claim
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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

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