STICKY GLUE Russian patent published in 1994 - IPC

FIELD: glueing materials. SUBSTANCE: glue has 60% solution of polyurethane ureylene of the general formula , where R - CH₃C₆H₃; R¹=CH₂CH(CH₃), n = 1, m = 4, mol. mass is 10-15 000, in mixture of ethylacetate and dimethylformamide (100 mas. p. ) and acid taken from a group containing, mas. p. : nitric acid 0.5-1.0; sulfuric acid 0.5-1.5; hydrochloric acid 0.5-3.0; trifluoroacetic acid 0.5-1.5; oxalic acid 1-10, isophthalic acid 5-10. Solution of polyurethane ureylene is mixed with acid, applied on backing, solvent is removed at 60-80 C, and glue layer is doubled with polyethylene film. Protecting film is removed before using. Glue properties: static shift at 20 C is 168 h, at 80 C is 2 h, exfoliating strength at 20 C is 1.0 kN/m. EFFECT: enhanced quality of glue. 1 tbl