Vinyl alcohol polymer, method for producing vinyl alcohol polymer, dispersant for suspension polymerization, dispersion assistant for suspension polymerization, and method for producing vinyl polymer

• Main Authors: FUKUYAMA, MISUZU, KATO, MASAKI
• Format: Patent
• Language: Chinese; English
• Published: 16.06.2022
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The present invention provides: a novel vinyl alcohol polymer; a method for producing this vinyl alcohol polymer; a dispersant for suspension polymerization, said dispersant enabling the achievement of polymer particles which have a small average particle diameter, while containing fewer coarse particles, and which exhibit good plasticizer absorption; a dispersion assistant for suspension polymerization; and a method for producing a vinyl polymer. The present invention provides a vinyl alcohol polymer which comprises a carbonyl group, a formyl group and an alkenyl group in a same molecule or in different molecules. The present invention also provides a method for producing a vinyl alcohol polymer, said method comprising: a step for polymerizing a vinyl ester in the presence of an aliphatic unsaturated aldehyde; and a step for saponifying the thus-obtained vinyl ester polymer.