| 摘要 |
PURPOSE:To produce the molding for treatment with high accuracy and grade by incorporating an org. solvent which does not dissolve a base polymer, can be mixed with a plasticizer and evaporates by depriving of sufficient latent heat without foaming at the time of curing by heating into the resin compsn. CONSTITUTION:The hard 1st molding part is formed at the temp. lower than the processing temp. at the time of curing by molding (molding) of the soft 2nd molding part by using the resin compsn. for treatment (particularly, PVC plastisol) contg. the base polymer (more particularly, polyvinyl chloride), the plasticizer (for example, di-2-ethylhexyl phthalate) and the org. solvent (for example, synthetic isoparaffinic hydrocarbon) which has substantially no dissolving power to the base polymer and can be mixed with the plasticizer at the time of producing cannula. The soft 2nd molding part is formed by a heating and curing treatment after the hard 1st molding part is brought into contact with the resin compsn. for treatment (more particularly, PVC plastisol) which does not contain the plasticizer. This org. solvent can evaporate by sufficiently depriving of the latent heat of evaporation without foaming at the time of curing by heating. |
