PROCESS FOR PAPER SIZING WITH ANIONIC HYDROPHOBIC SIZING AGENTS AND CATIONIC RETENTION AGENTS

摘要

1. A process for sizing paper or cardboard, which comprises using at least (A) a sizing agent consisting of an aromatic compound which contains in the aromatic nucleus a single hydrophobic substituent having at least 5 carbon atoms and at least one anionic group, acidic or in salt form, the hydrophobic substituent being linked to the aromatic nucleus through an ester, amide, urethane or urea bridge member, in the case of ester and amide bridge members the CO unit being attached to the hydrophobic radical and a methylene group being optionally present between the bridge members and the aromatic nucleus, and (B) a polymeric cationic retention aid.