C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/7412
C08F 2/16 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08L 75/04 (2006.01)
Patent
CA 2020785
ABSTRACT A semi-continuous process for the preparation of polyurethane ionomer or polyurethane-urea ionomer aqueous dispersions which comprises: 1) forming an isocyanate-terminated ionic prepolymer in a reaction zone A by contacting (i) an excess of an aliphatic or cycloaliphatic diisocyanate, or mixture of an aliphatic or cycloaliphatic diisocyanate with an aromatic diisocyanate; (ii) an organic polyol, and (iii) a difunctional isocyanate-reactive component containing an ionic group or potential ionic group, with the proviso that where an aromatic diisocyanate is used, the equivalents of aromatic diisocyanate used are less that the equivalents of the organic polyol and difunctional isocyanate-reactive component; 2) transferring the prepolymer to a reaction zone B; 3) contacting the prepolymer in reaction zone A or reaction zone B with a 37,225-F neutralizing agent under conditions such that the ionic groups are neutralized: 4) adding water to reaction zone B until a prepolymer in water emulsion with a particle size of from about 300.ANG. to about 10,000.ANG. (30 nm to 1,000 nm) is formed; 5) adding to reaction zone B a hydrocarbon polyamine extender, a solution of a hydrocarbon extender, or a catalyst which facilitates the chain extension of the prepolymer by water under conditions such that a polyurethane or polyurethane-urea ionomer is formed; and 6) removing the polyurethane or polyurethane- urea ionomer polyurethane-urea ionomer from reaction zone B. 37,225-F
Anand Joginder N.
Ruetman Sven H.
Smart & Biggar
The Dow Chemical Company
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