PAPER OR CARDBOARD WITH COATING, RECYCLABLE, AND METHODS OF THEIR MANUFACTURE Russian patent published in 2014 - IPC D21H19/24 D21H19/58 D21H23/22 

FIELD: textiles, paper.

SUBSTANCE: invention relates to production of a wide range of high-quality paper or cardboard with coating, recyclable, to create articles with improved barrier properties, in particular for packing foodstuffs or other products sensitive to environmental influences. Surface sizing and calendering paper or cardboard is carried out. The paper or cardboard are coated with the aqueous polymer dispersion. The coating is applied by one or more units for application of coating which are autonomous with respect papermaking or cardboard making machine. The coating consists of at least two layers. The second layer of the coating contacts with the first layer. Each layer of the coating is made from an aqueous polymer dispersion containing from about 70 wt % to about 90 wt % emulsion polymer binder and from about 10 wt % to about 30 wt % pigment. The aqueous polymer dispersion additionally comprises additives selected from the group consisting of thickeners, anti-foaming agents or antifoamers, dispersing additives, cross-linking agents, antifrictional additives, release agents, adhesion reducing agents. The coating does not contain wax in detectable amounts.

EFFECT: method produces an article of paper or cardboard with the coating having improved barrier properties, and is suitable for heat sealing.

20 cl, 3 dwg, 4 ex