发明授权
US4216300A Color developer for pressure-sensitive copying paper 失效
压敏复印纸的彩色显影剂

Color developer for pressure-sensitive copying paper
摘要:
A color developer for pressure-sensitive copying papers is prepared by mixing a para-substituted difunctional phenol-aldehyde condensate and tri- or higher-functional phenol-aldehyde condensate. The tri- or higher-functional phenol-aldehyde condensate can be modified by a polyvalent metal.
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