Patent ID: 6174956
Filing Date: 2001-01-16
Classification: C08G

Abstract:
A process of synthesizing a waterborne polyurethane polymer comprising the steps of(a) selecting a di-or polylsocyanate;(b) selecting a polyol with latent ionic functionality;(c) treating said polyol from step (b) with an acid or a base or a quaternizing agent to express the ionic functlonality as an anionic or cationic group prior to step (d);(d) optionally selecting additional polyols selected from the group consisting of polyols which do not have latent ionic functionality, polyols which have latent ionic tunctionality, and combinations thereof;(e) combining the polyol of step (c) and the optionally selected additional polyols of step (d) with the di- or polyisocyanate in a ratio of 2.0:1.0 to 0.1:1.0 isocyanate groups to active hydrogens to form a product under densified fluid conditions using densified fluid having a pressure of from about 14.7 psi to about 10,000 psi, a temperature range of about 0.degree. C. to about 200.degree. C. and a time period of about ten minutes to about thirty-six hours;(f) dispersing the product of step (e) in water;(g) optionally chain extending the product of step (e) with chain extending agents, provided that the isocyanate groups to active hydrogens are present in a ratio of greater than 1:1.