PRODUCTION OF LIGHTWEIGHT POLYESTER BEAD

PURPOSE:To efficiently produce porous polyester beads having a lighter weight, i.e., a lower apparent specific gravity and higher voids in a short time. CONSTITUTION:This method for producing lightweight polyester beads is to add and disperse 100-800 pts.wt. aqueous suspension of a hydroxide of an a...

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Bibliographische Detailangaben
Hauptverfasser:	TSUKISAKA RYOGO, NAKAJIMA YASUO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To efficiently produce porous polyester beads having a lighter weight, i.e., a lower apparent specific gravity and higher voids in a short time. CONSTITUTION:This method for producing lightweight polyester beads is to add and disperse 100-800 pts.wt. aqueous suspension of a hydroxide of an alkaline earth metal in 100 pts.wt. oily phase composed of an unsaturated polyester and a polymerizable monomer, add the resultant dispersion into an aqueous solution containing a suspension stabilizer, redisperse the dispersion therein, cross-link and cure the dispersed polymer, then dry the obtained cured material. A calcium hydroxide slurry or a magnesium hydroxide slurry or both having 20-90ml/100ml sedimentation volume at 4 deg. Be' concentration after 1hr are used as the hydroxide of the alkaline earth metal and the aqueous suspension is prepared by using the slurry.