GLUEING COMPOSITION Russian patent published in 1996 - IPC

FIELD: acrylic copolymer-base compositions. SUBSTANCE: glueing composition has, mas. p.: 45-55% aqueous dispersion of acrylic copolymer 100; 60-70% colophony solution in organic solvent 2.0-5.5; 20-25% alkaline aqueous solution 0.3-0.6; filler 12-20, and plasticizer - phthalic acid $$$-alkyl ester 5-10. Composition can contain 7-15 mas. p. thickening agent as 10% solution. Composition has copolymer of butylacrylate, methylmethacrylate and methacrylic acid as an acrylic copolymer at mass ratio of monomers = (60-75): (15-35): (3-10); thickening agent: rare-linked copolymer of butylacrylate, methacrylic acid, methacrylic acid ammonium salt and ethylene glycol dimethacrylate at mass ratio of comonomers = (20-40):(20-30):(30-56):(0.5-1) and additionally - plasticizer. Glueing composition has the following properties: seizing time is 6-10 min; time for complete strength is 12 h; exfoliation strength after 24 hr is 1.4-2.6 kgf/cm; strength loss at exfoliation after 5 cycles freezing-thawing of glueing joint (1 cycle: 40 C - 2 h, room temperature - 3 h) is 3-5%; strength loss at exfoliation after glueing joint exposition in chamber at humidity 96% for 48 h is 5-10%. Composition does not coagulate after freezing at minus 40 C. EFFECT: enhanced quality of composition. 1 tbl