SIZING COMPOSITION FOR HOT PENETRANT RESISTANCE Russian patent published in 2015 - IPC D21H21/16 

FIELD: chemistry.

SUBSTANCE: method involves the addition of an aqueous emulsion, comprising a reactive sizing agent and an insolubilising agent, either separately or in a blended form to aqueous pulp slurry and forming the slurry into cardboard or paperboard. The reactive sizing agent comprises at least 30 wt % of a linear saturated fatty acid anhydride C_14-22. The insolubilising agent selected from the group consisting of alum (aluminium sulphate) and polyaluminumchloride (PAC).

EFFECT: invention makes it possible to increase the paperboard resistance to hot hydrogen peroxide solution and lactic acid.

10 cl, 9 tbl, 6 ex