Use of acrylamide copolymer to reduce stickies deposits

• US 6,387,215 B1
• Filed: 05/18/2001
• Issued: 05/14/2002
• Est. Priority Date: 05/18/2000
• Status: Expired due to Term

• Current Assignee: Kemira Chemicals Incorporated (Kemira Oyj)
• Original Assignee: Callaway Chemical Corporation
• Inventors: Kurowsky, Stephen R., Schellhamer, Alan J., Spence, Gavin G.
• Primary Examiner(s): Nguyen, Dean T.
• Application Number:
  US09/860,754
• Time in Patent Office: 361 Days
• Field of Search: 162/48, 162/168.3, 162/199, 162/1.58, 162/DIG.4
• US Class Current: 162/199
• CPC Class Codes: D21H 21/02 Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control removal of fats, resins, pitch, or waxes D21C9/08
• CPC Class Codes: Y10S 162/04 Pitch control

Abstract

A process for controlling/reducing the deposition of stickies from paper stock suspensions in papermaking involving the steps of: (a) providing a paper stock suspension containing stickies; and (b) contacting the stickies in the paper stock suspension with a copolymer of about 75-95 wt % acrylamide and about 5-25 wt % vinyl acetate.

Claims

1. A method of inhibiting the deposition and adherency of adhesive materials on the surfaces of papermaking equipment during the manufacture of paper from a pulp furnish containing repulped waste paper or paperboard products having such adhesive materials which comprises adding to the pulp furnish about 0.5 to 100 ppm of a water-soluble copolymer of about 75-95 wt % acrylamide and about 5-25 wt % vinyl acetate.

2. The method according to claim 1, wherein the copolymer is used in an amount of about 1 to 30 ppm.

3. The method according to claim 1, wherein the copolymer comprises about 80-92 wt % acrylamide and about 8 to 20 wt % vinyl acetate.

4. The method according to claim 1, wherein the copolymer comprises about 85 to 90 wt % acrylamide and about 10-15 wt % vinyl acetate.

5. The method according to claim 1, wherein the copolymer has a viscosity of about 250 to 10,000 cp as a 15% solids solution.

6. The method according to claim 1, wherein the adhesive material is selected from the group consisting of styrene butadiene rubber, vinyl acrylate based adhesives, natural rubber adhesives, and polyisoprene adhesives.

7. The method according to claim 1, wherein the adhesive material is selected from the group consisting of contact adhesives, dispersion-based adhesives, and hot-melt adhesives.

8. A method of inhibiting the deposition and adherency of stickies contained in a pulp produced from waste paper or paper products on the surfaces of equipment, utilized to produce finished paper products from said pulp which consists essentially of adding to the pulp about 0.5 to about 100 ppm of a copolymer comprising about 75 to 95 wt % acrylamide and about 5 to 25 wt % vinyl acetate.

9. The method according to claim 8, wherein the copolymer is used in an amount of about 1 to 30 ppm.

10. The method according to claim 8, wherein the copolymer comprises about 80-92 wt % acrylamide and about 8 to 20 wt % vinyl acetate.

11. The method according to claim 8, wherein the copolymer comprises about 85 to 90 wt % acrylamide and about 10-15 wt % vinyl acetate.

12. The method according to claim 8, wherein the copolymer has a viscosity of about 250 to 10,000 cp as a 15% solids solution.

13. The method according to claim 8, wherein the stickies comprise an adhesive material selected from the group consisting of styrene butadiene rubber, vinyl acrylate based adhesives, natural rubber adhesives, and polyisoprene adhesives.

14. The method according to claim 8, wherein the stickies comprise adhesive materials selected from the group consisting of contact adhesives, dispersion-based adhesives, and hot-melt adhesives.

15. A method of preventing paper and paper products from adhering to the surfaces of paper production equipment and to other paper and paper products when said products are produced from a pulp derived at least in part from waste paper or paper products containing hot melt or pressure sensitive adhesive materials, which comprises incorporating into the pulp used to form said paper or paper product about 0.5 to about 100 ppm of a copolymer consisting essentially of moieties of acrylamide, which polymer further contains hydrophobic groupings and is water-soluble.

16. The method according to claim 15, wherein the copolymer is used in an amount of about 1 to 30 ppm.

17. The method according to claim 15, wherein the copolymer comprises about 80-92 wt % acrylamide.

18. The method according to claim 15, wherein the hydrophobic group-ings are derived from monomers selected from the group consisting of vinyl acetate, methyl (meth)acrylate, methyl ethacrylate, octadecyl-acrylate, n-octadecyl-acrylamide, styrene, methyl styrene, allyl stearate, vinyl stearate, ethene, propene, n-butene, isobutene, pentene, dodecene, octadecene, vinyl ethers higher than methyl, and acrylonitrile.

19. The method according to claim 15, wherein the copolymer comprises about 85 to 90 wt % acrylamide and about 10-15 wt % vinyl acetate.

20. The method according to claim 15, wherein the copolymer has a viscosity of about 250 to 10,000 cp as a 15% solids solution.