PRODUCTION METHOD OF POLYMER

• Main Authors: MASAMOTO JUNZO, TANIGAWA YUKIO
• Format: Patent
• Language: English
• Published: 02.04.2002
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To obtain a polymer with few unstable parts which deactivates a polymerization catalyst in a simple form, without needing complicated facilities. SOLUTION: When a copolymer of a trioxane and a cyclic formal is polymerized by a cationic catalyst in the presence of the formal of a formula R1OCH2 OR, a polymerization reaction is progressed in a homogeneous system during meeting a specific relation of P>=94-1.43T+5.67×10-3T2 between pressure P (atm) which puts on a reaction system and polymerization temperature ( deg.C). Then reactants are blended uniformly, a cationic catalyst is deactivated, and an unreacting trioxane or the like is removed from uniform molten products by evaporation. The production method of a polyacetal whose unstable parts of terminated polymer are below 1 wt.% is provided.