Process for manufacture of phosphate esters of hydroxyl-containing polymeric materials

摘要

Polymeric materials containing secondary hydroxyl groups are treated in suspension in a liquid non-aqueous organic suspension medium at a raised temperature with a substantially anhydrous reaction product of orthophosphoric acid and urea or an N-substituted urea so that at least a fraction of said hydroxyl groups are esterified to form an acid ammonium salt of formula where R and R1 represent the remainder of the polymeric molecule. Specified polymeric materials are polyvinyl alcohol and partial esters, acetals and ketals thereof; copolymers of vinyl alcohol and acrylic, methacrylic, crotonic or maleic acid or derivatives thereof; copolymers of vinyl alcohol with ethylene or vinyl chloride; cellulose derivatives such as methyl-, ethyl- and hydroxy-ethyl cellulose; and starches and fractions thereof such as amylose and amylopectin. Specified substituted ureas are methyl-, ethyl-, dimethyl- and phenyl-urea. The suspension medium may be an alcohol and/or aromatic hydrocarbon, e.g. butanol or hexanol and/or benzene or toluene. The products may be cross-linked by heating and may be used in preparing cation exchangers, as flame-resistant additives, as textile finishing agents and for improving the dye receptivity of textile materials. In examples, reaction products of urea and orthophosphoric acid are reacted with (I) to (iv) polyvinyl alcohol and (V) methyl cellulose or hydroxyethyl cellulose.