PREPARATION OF PREPOLYMER

PURPOSE:To prepare a liquid prepolymer capable of giving a cured polymer dyeable without causing dyeing speck, by adding a specific amount of a radical polymerization initiator to diethylene glycol bisallyl carbonate, and keeping the mixture at a specific temperature. CONSTITUTION:Diethylene glycol...

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Bibliographische Detailangaben
1. Verfasser:	FUTAKI KOUJI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To prepare a liquid prepolymer capable of giving a cured polymer dyeable without causing dyeing speck, by adding a specific amount of a radical polymerization initiator to diethylene glycol bisallyl carbonate, and keeping the mixture at a specific temperature. CONSTITUTION:Diethylene glycol bisallyl carbonate is compounded with 0.3-2.3 wt% radical polymerization initiator (e.g. isobutyl peroxide) and maintained at 5-35 deg.C for 6-72hr to obtain the objective liquid prepolymer. EFFECT:Since the reaction is carried out at a low temperature, the gelation of the prepolymer can be minimized and the prepolymer can be poured easily into a glass mold.