PREPARATION OF RESIN SOLUTION

PURPOSE:To prepare a resin soln. stable and excellent in adhesion in a simple process, by cooling below 40 deg.C a polyvinyl acetal resin soln. in which the catalyst used for the synthesis has been neutralized, and then adding a thermosetting resin to the soln. CONSTITUTION:A polyvinly alcohol with...

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Hauptverfasser:	KOBAYASHI SATOSHI, NISHIZAWA TAKUJI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To prepare a resin soln. stable and excellent in adhesion in a simple process, by cooling below 40 deg.C a polyvinyl acetal resin soln. in which the catalyst used for the synthesis has been neutralized, and then adding a thermosetting resin to the soln. CONSTITUTION:A polyvinly alcohol with an average polymn. degree of about 300-2,500 is converted into the corresponding acetal with an aldehyde using an alcohol as solvent at about 50-70 deg.C in the presence of an acid catalyst. An alkali is added to the resulting alcoholic soln. of polyvinyl acetal for neutralizing the acid catalyst. After the neutralized soln. is allowed to cool below 40 deg.C, a thermosetting resin (e.g., a resol type phenolic resin) is added to the soln., yielding a resin soln. The ratio of the polyvinyl acetal resin to the thermosetting resin is pref. about 30: 70-70:30 in a weight ratio of solid content.