Patent ID: 6120701
Filing Date: 2000-09-19
Classification: B01J,C08G,C09K,Y10T

Abstract:
A liquid crystal article comprising a plurality of microencapsulated liquid crystal droplets, wherein each droplet is encapsulated within a polyurethane/polyurea or polyurea polymer wall, wherein the polyurethane/polyurea or polyurea wall is prepared by reacting a polyisocyanate with a polyol/polyamine derived from polyisocyanate or a polyamine, the polyisocyanate is selected from the group consisting of 1,6-hexamethylene diisocyanate, toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, bis-(4-isocyanatocyclohexyl) methane, isophoronediisocyanate, diphenylmethane-4,4-diisocyanate, derivatives thereof and mixtures thereof, and the polyol or polyamine are selected from the group consisting of diethylene glycol, 2,2'-thiodiethanol, 2-mercaptoethylsulfide, 2-mercaptoethylether, triethylene glycol, 2-methylpropane-1,3-diol, 2-ethylpropane-1,3-diol, 2-n-propylpropane-1,3-diol, 2-n-butylpropane-1,3-diol, 2-methyl-2-n-butylpropane-1,3-diol, diethanolamine, triethanolamine, N-n-butyldiethanolamine, N-ethyldiethanolamine, N-methyldiethanolamine,tris(hydroxymethyl)aminomethane, trimethylolpropane, pentaerythritol, 1,4-butanediol, 1,6-hexanediol, 2,2-bis(hydroxymethyl)propionic acid, dimethylolmelamine, trimethylolmelamine, hexamethylolmelamine, ethylenediamine, 1,4-butanediamine, 1,6-hexanediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, melamine and mixtures thereof.