aqueous dispersions for the production of coatings, thermo sigillabili and relevant process of termosigillatura

摘要

1498452 Laminates CHEMISCHE WERKE HULS AG 19 May 1975 [24 July 1974] 21135/75 Heading B5N [Also in Divisions B2 and C3] Compositions for forming heat-sealable coatings comprise a mixture of an aqueous dispersion of polyvinyl chloride containing 60-65% solids and a 30-50% strength aqueous solution of an ammonium or amine salt of an unsaturated polyester of M.W. 800-3000 such that the weight ratio of PVC : polyester is 80 : 20 to 20 : 80 and the viscosity of the aqueous mixture is 150-300 cp. The compositions may be applied to paper, cardboard, textiles or wood and dried preferably at below 115‹ C. In examples cotton is coated and sealed to uncoated cotton, e.g. at at least 140‹ C. for 1-6 seconds under a pressure of 0À1-6À0 kp./cm.SP2/SP.