Production manner null of surface size medicine and newsprint for newsprint

摘要

PURPOSE: To enable the desired surface sizing without deteriorating the operating efficiency by applying a sizing coating liquid containing a substituted succinic anhydride as an active component through a gate roll coater to base paper of newspapers. ;CONSTITUTION: This surface sizing agent for newsprint paper is obtained by adding water to an anhydride of a substituted succinic acid such as tetradecenylsuccinic acid, hexadecenylsuccinic acid or triacontenylsuccinic acid while adding dodecylbenzenesulfonic acid thereto and stirring the resultant mixture and providing an emulsion. Furthermore, this method for producing surface-sized newsprint paper is to mix the resultant emulsion with an aqueous solution of oxidized starch, prepare a sizing coating liquid having s 1000cP, preferably ≤200cP viscosity (at 25°C), subsequently apply the prepared sizing coating liquid through a gate roll coater in an amount within the range of 0.005-5.0g/m², preferably 0.01-2.0g/m² expressed in terms of a solid add-on to base paper of newspapers and dry the coated base paper with a dryer.;COPYRIGHT: (C)1995,JPO