| 摘要 |
PURPOSE: Condensation products of melamine-aldehyde are provided to reduce contents of formaldehyde remained in condensation products by putting a reactive alcohol compound in during process copolymerization-condensing melamine, and formaldehyde or formaldehyde-providing compounds. CONSTITUTION: Condensation products of melamine-aldehyde are obtained by copolymerization-condensing 100.0 parts by weight of melamine, and a mixture consisting of240-280 parts by weight of formaldehyde or formaldehyde-providing compound and 3-8 parts by weight of polyvinylalcohol aqueous solution(30 weight% purity). The formaldehyde providing compound is one or a mixture of two more selected from formalin, paraformaldehyde, 1,3,5-trioxane, or oligomeric or polymeric formaldehyde of 1,3,5,7-tetroxocan.
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