PAPER OR CARDBOARD SUBSTRATE COMPRISING CELLULOSIC FIBRES AND EXPANDABLE MICROSPHERES, AND PACKAGING CONTAINER COMPRISING THIS SUBSTRATE Russian patent published in 2014 - IPC D21H21/54 

FIELD: textiles, paper.

SUBSTANCE: present invention relates to a paper or cardboard substrate comprising cellulosic fibres and 0.1 to 5 wt % expandable microspheres, at that the outer surfaces of expandable microspheres are connected with an ionic compound selected from the group comprising the polyamine compound, the polyethyleneimine compound, colloid or sol comprising at least one member of the group consisting of silica, alumina, tin oxide, zirconium dioxide, antimony oxide, iron oxide and oxides of rare earth metals, at that the substrate has smoothness Sheffield of less than 250 units as measured by the method TAPPI T 538 om-1, and colour speckling 2nd cyan which is not greater than 6, and to use of paper or cardboard substrate as the packaging container.

EFFECT: density reduction, increase in volume and preservation of operating characteristics such as smoothness of the paper substrate and absence of speckling is achieved.

9 cl, 5 tbl, 5 dwg