×

Loaded paper

  • US 4,925,530 A
  • Filed: 07/20/1988
  • Issued: 05/15/1990
  • Est. Priority Date: 12/21/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A process for the production of loaded paper from papermaking fibre and filler, comprising the steps of:

  • (a) treating the papermaking fibre in an aqueous medium with a charged synthetic polymer;

    (b) separately treating the filler in an aqueous medium with a charged synthetic polymer, with the proviso that if the charged synthetic polymer used to treat the filler is anionic it is selected from papermaking flocculents and retention aids;

    (c) selecting the charged synthetic polymer used in step (a) and the charged synthetic polymer used in step (b) such that both have the same charge polarity;

    (d) additionally treating the filler with a charged polymer of opposite charge polarity from that of the polymer(s) used in steps (a) and (b);

    (e) mixing aqueous suspensions of treated filler and treated papermaking fibre from steps (a), (b) and (d) to form a papermaking stock, diluting as necessary before, during or after the mixing operation; and

    (f) draining the papermaking stock to form a loaded paper web, wherein the filler, papermaking fibre and charged polymers are used in amounts effective to produce loaded paper.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×