| 简介 |
PROBLEM TO BE SOLVED : To provide a reclaimed resin using a decomposition product of a urethane resin and a process for producing the reclaimed resin and to provide a reclaimed urethane as a urethane resin composition having good decomposability.
SOLUTION : In the process for synthesizing a reclaimed urethane from a decomposition product of a urethane, the reclaimed urethane is synthesized by a two-step reaction consisting of the first reaction for preparing a prepolymer having an isocyanate at an end thereof as an isocyanate component to be reacted with the decomposition product or synthesizing a prepolymer from the reaction of the decomposition product and an isocyanate and the second reaction for synthesizing a urethane resin from the prepolymer. As a result, urea bonds are inhibited from being densely formed in the prepolymer and the bonds difficult to be decomposed can be readily dispersed. Furthermore, the structure in the reclaimed resin can be controlled to provide for uniformity in the components and the molecular weight of a secondary decomposition product into which the reclaimed resin is re-decomposed, whereby the reclaimed urethane results in a urethane resin composition which can be easily decomposed for recycle use. |
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