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windbreaker: ½ð±Ò+5, ¡ïÓаïÖú 2016-08-30 17:01:15
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¿ÉÒÔÓÃ×÷¾ÛºÏÎï¾ÛºÏʱµÄÒÖÖÆ¼ÁºÍ¼õËÙ¼Á¡£Inhibiting and retarding the premature polymn. and the polymer growth of vinyl arom. monomers comprises adding to the monomers an effective amt. of an inhibitor and retarder blend comprising (A) ¡Ý1 arom. sulfonic acid, (B) ¡Ý1 amine, (C) ¡Ý1 nitrophenol, and (D) ¡Ý1 member of the group of nitroxy radical-contg. compds. and nitrosoanilines. The Continuous Dynamic Reboiler Test of the combination of 4-oxo-TEMPO/dodecylbenzenesulfonic/N-methyl-2-pyrrolidinone/2,4-dinitro-6-sec-butylphenol at concns. of 100 ppm/100 ppm/30 ppm/ 250 ppm, resp., resulted in 0.0004% polymer in 5 h steady stage and 0.31% polymer after 2 h feed shut off. US 20060122341 |
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