| 摘要 |
PURPOSE:To form a resin for casting having an excellent easy collapsing property by bringing phosphate and/or phosphite at a specific ratio into ester exchange reaction with bisphenol then bringing formaldehyde into reaction. CONSTITUTION:0.1-1.0mol phosphare and/or phosphite is brought into reaction with 1.0mol bisphenol A to execute an ester exchange and thereafter 1.0-5.0mol formaldehyde is brought into reaction in the production of the resin for casting. The resin for casting having the excellent collapsing property even with mechanical impact is thus formed without requiring a long-term heating treatment after casting.
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