Patent ID: 8877009

Claim:
A pulp making process comprising: pulping a fibrous cellulosic material to form an aqueous suspension comprising the cellulosic material, draining the suspension through a screen to form a pulp sheet, and drying the pulp sheet to form a dry market pulp, wherein a water soluble cationic polymer is added to the suspension as a sole drainage aid wherein the water soluble cationic polymer is the only drainage aid added to the suspension in the process, and wherein the water-soluble cationic polymer is: a copolymer comprising between 1 and 70 mole % (meth)acrylamide and between 30 and 99 mole % (meth)acryloyloxyethyltrimethyl ammonium chloride with an intrinsic viscosity of between 5 and 9 dl/g.