Patent ID: 8425726

Claim:
Paper or paperboard obtained by a process comprising the steps of: 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 anionic organic polymeric microparticles, wherein the anionic organic polymeric microparticles are formed from at least one acrylic anionic monomer and at least one acrylic non-ionic monomer, wherein the acrylic anionic monomer is (meth)acrylic acid, 2-acylamido-2-methyl-1-propanesulfonic acid, or salts thereof.