FIELD: chemistry.
SUBSTANCE: composition is an adhesive composition based on starch or polyvinyl acetate. The adhesive composition contains glue and an additive. The additive is a homopolymer of α,β-unsaturated acrylic acid or a copolymer of α,β-unsaturated acrylic acid with at least one alkylacrylate. The homopolymer or copolymer is cross-linked by a cross-linking agent which is a multifunctional vinylidene monomer. The vinylidene monomer is, for example, butadiene, isoprene, divinyl benzene or divinyl naphthalene. The cross-linking agent is polyalkenyl ether with several ether groups, particularly allyl pentaerythritol. The additive is a pseudoplastic material. The adhesive composition contains at least 0.001 wt % additive. The method of preparing the adhesive composition involves diluting the additive with starch and an optical brightening agent and then adding to the adhesive composition. The additive is mixed in form of a solid composition with a solid starch composition in form of a solid mixture prepared beforehand. The solid mixture contains thickened starch, alkali, powdered starch, borax and 0.001-5 parts additive. Alternatively, the additive is added to a liquid starch composition in form of a liquid composition. The adhesive composition is used particularly to make packed cardboard with several stacked layers of paper or cardboard.
EFFECT: adhesive composition has low viscosity when applied on corrugated cardboard, after which viscosity instantly increases, which prevents the glue from flowing off and ensures good adhesion.
16 cl, 1 dwg
