C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/04 (2006.01) B32B 7/12 (2006.01) C08F 283/00 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C09J 175/04 (2006.01)
Patent
CA 2141715
A method for making a polyurethane/acrylic polymer dispersion useful as a film to film laminate adhesive comprising: (a) reacting a polyol and isophorone diisocyanate to consume essentially all of the polyol hydroxyl functionality; (b) adding an isocyanate-reactive compound containing a carboxylic functionality and reacting it with the isophorone diisocyanate) the amount of isophorone diisocyanate in steps (a) and (b) being sufficient to yield a carboxylic-containing, water-dispersible, isocyanate-terminated polyurethane prepolymer having an isocyanate content of greater than 0 wt%; (c) adding at least one acrylic monomer during the step (b) prepolymer forming reaction; (d) neutralizing the carboxylic-containing prepolymer with a tertiary amine to yield a prepolymer salt/acrylic monomer mixture; (e) dispersing the prepolymer salt/monomer mixture in water; (f) adding a free-radical source and a chain terminator/extender composition comprising a monofunctional and a difunctional amine; and (g) polymerizing the acrylic monomer and completing chain extension of the prepolymer by heating the aqueous dispersion; steps (a)-(g) preferably performed in the absence of an organic cosolvent.
Derby Richard
Gruber Bruce A.
Air Products And Chemicals Inc.
Mcfadden Fincham
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