NOVEL WATER-BASED ADHESIVES FOR INDUSTRIAL APPLICATIONS Russian patent published in 2011 - IPC C08J3/12 

FIELD: chemistry.

SUBSTANCE: adhesive is obtained by mixing repeatedly water-dispersed polymer powder and water-soluble polymer powder with water. Weight ratio of the repeatedly water-dispersed polymer powder and water-soluble polymer powder ranges from approximately 0.001:1 to 100:1. The water-based adhesive has rate of hardening less than 300 s on a layer with thickness of 36 mcm at 23°C and 50% relative moisture and cardboard with thickness of 385 mcm, weight 275 ± 3 g/m² and Cobb value of 43 g/min/ m² - on one side and 27 g/min/m² on the other side. The adhesive has content of solid particles of approximately 7.5-70 wt % and Brookfield viscosity at 23°C and 20 rpm, measured in accordance with ASTM D1084 standard approximately equal to 500-10000 mPa.s. The water-based adhesive can glue a substrate with low surface tension with a cellulose substrate. In particular, the weight ratio of the repeatedly water-dispersed polymer powder and the water-soluble polymer powder ranges from approximately 0.5:1 and 100:1. The adhesive can replace traditional water adhesives based on synthetic polymer dispersions. The adhesive has high rate of hardening, which increases machine speed. Use of the adhesive in form of powder increases storage life.

EFFECT: adhesive is ecologically acceptable and has low content of volatile organic substances.

10 cl, 4 tbl, 4 ex