Internal size agent composition and internal sizing manner null for paper manufacture

摘要

PURPOSE:To obtain the subject composition, containing a ketene dimer based compound and specific polymer in a specified proportion and excellent in storage stability, mechanical stability and sizing properties. CONSTITUTION:The objective composition containing (A) 100 pts.wt. ketene dimer based compound expressed by the formula (R1 and R2 are 8-30C hydrocarbon) and (B) 2-100 pts.wt. polymer obtained by (co)polymerizing a vinylic monomer [e.g., monoalkylamino(hydroxy)alkyl (meth)acrylate or (meth)acrylamide] in the presence of a 6-22C alkyl mercaptan (preferably n-octyl mercaptan or n-dodecyl mercaptan). Furthermore, the above-mentioned alkyl mercaptan is preferably present in an amount of 0.01-10mol% based on the vinylic monomer.