| 摘要 |
Improved resins are obtained by substituting urea for part of the melamine in known cationic water-soluble resins obtained by interaction of melamine, an aliphatic hydroxymonoamine such as triethanolamine, and formaldehyde. The new resins, which have molar ratios melamine:urea:hydroxyamine:formaldehyde in the range 1:0.25-8:0.1-2.5:4-30, have a faster curing rate and better stability in the liquid state for a given content of formaldehyde. |
