| 摘要 |
Monovinyl ethers are polymerized in the presence of chromic anhydride and an antioxidant. Specified vinyl ethers are methyl, ethyl, propyl, n-butyl, isobutyl, sec. butyl, tert. butyl, n-pentyl, n-hexyl, n-octyl, 2-ethylhexyl, lauryl, stearyl, benzyl and cyclohexyl vinyl ethers. Specified antioxidants are dihydric phenols, nuclear hydrocarbon substituted phenols and arylamines, e.g. hydroquinone, mono and di tert. butyl para cresol mono and di tert. butyl phenol, bis(2-hydroxy-3-tert. butyl-5-methylphenyl) methane, bis(2-hydroxy-3-a -methylcyclohexyl-5-methylphenyl) methane, 2 - a - methylcyclohexyl - 4,6 - dimethylphenol, 2 - tert. butyl - 4,6 - dimethylphenol, 2 - and 3-tert. butyl-4-methoxyphenols, N-phenyl - a - naphthylamine and b - naphthylamine. The chromic anhydride is preferably heated at 100 to 150 DEG C. for 1 to 5 hours before use. Polymerization may be effected at elevated temperatures and pressures in bulk in the presence of an inert diluent, e.g. petroleum ether, n-hexane, n-heptane, cyclohexane, octane, benzene, toluene or xylene, and the polymer recovered by adding the reaction mixture to a non-solvent therefor, e.g. hot water or methanol The products may be extracted with solvents e.g. methyl ethyl ketone, to give crystalline polymers of high molecular weight which may be made into films, sheets, filaments and other shaped articles. Examples describe the polymerization of isobutyl vinyl ether in the presence of (1 and 5) di tert. butyl cresol (6) hydroquinone, (7) tert. butyl hydroquinone and (8) tert. butyl phenol; isopropyl vinyl ether in the presence of (2) tert. butyl hydroquinone; ethyl vinyl ether in the presence of (3) tert. butyl phenol and methyl vinyl ether in the presence of (4) di tert. butyl cresol. |
