PROCESS FOR PREPARING PRECONDENSATE OF THERMOSETTING LOW- FORMALDEHYDE Russian patent published in 1997 - IPC

FIELD: finishing of textile materials. SUBSTANCE: carbamide and glyoxal are condensed in acid medium, the resulting product is methylated with formalin in alkaline medium, the resulting product is esterified with methanol in acid medium in the presence of phosphated butanol product with phosphoric anhydride at methanol to initial carbamide molar ratio of 1.7-2.5:1 the desired product has etherification degree of 55-80%, residual methanol content is not higher than 6% and free formaldehyde content is not higher than 0.2%. EFFECT: more efficient preparation process. 1 tbl