Ways to modify the gels of polyvinyl formal,polyvinyl acetate,urea-formaldehyde and amylum are plesented and formulae and alternate properties of various modified products introduced.

• 讨论了聚乙烯醇缩甲醛胶、聚醋酸乙烯酯胶、脲醛胶、淀粉胶的改性途径，介绍了各改性产品的配方及其性能比较。