Process for Improving Paper Strength
AssigneeBASF SE
InventorsSuleman Buwono, Gary Reddihough, Jozef Maria Leonardus Dogge
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Abstract
The present invention provides a process for preparing a paper or paper board of improved strength which comprises the steps of i) providing a cellulosic thick stock, ii) diluting the thick stock of step i) to form a thin stock, iii) draining the thin stock of step ii) on a wire to form a web, and iv) drying the web of step iii) to form paper or paper board, wherein the cellulosic thick stock of step (i) comprises organic polymeric microparticles, as well as paper obtainable by above process.
Claims4
A method for improving the strength of paper or paper board comprising adding organic polymeric microparticles into a thick stock.
A method of improving the strength of paper or paper board comprising:
- i) providing a cellulosic thick stock,
- ii) diluting the cellulosic thick stock of step i) to form a thin stock,
- iii) draining the thin stock of step ii) on a wire to form a web, and
- iv) drying the web of step iii) to form paper or paper board,
- wherein the cellulosic thick stock of step i) comprises organic polymeric microparticles,
- wherein the organic polymeric microparticles are formed from a composition comprising at least one acrylic anionic monomer and at least one acrylic non-ionic monomer, and
- wherein the acrylic non-ionic monomer is at least one of (meth)acrylamide;
- an N—C1-4-alkyl(meth)acrylamide;
- an N,N-di(C1-4-alkyl) (meth)acrylamide;
- or a C1-4-alkyl (meth)acrylate, and the acrylic anionic monomer is at least one of (meth)acrylic acid;
- 2-acrylamido-2-methyl-1-propanesulfonic acid;
- or salts thereof.
Dependencies are inferred from the claim text.