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    • 4. 发明申请
    • METHOD FOR REDUCING AND/OR PREVENTING PRODUCTION OF EXCESSIVELY LOW DENSITY POLYMER PRODUCT DURING POLYMERIZATION TRANSITIONS
    • 减少和/或防止在聚合过程中产生超低密度聚合物产品的方法
    • US20100144981A1
    • 2010-06-10
    • US12519484
    • 2007-12-12
    • Bruce J. SavatskyDaniel P. Zilker, JR.
    • Bruce J. SavatskyDaniel P. Zilker, JR.
    • C08F2/00
    • C08F10/00C08F210/16C08F2400/02Y10S526/901Y10S526/905C08F2/34C08F2/00C08F210/14C08F2500/12C08F2500/08
    • A method for controlling a transition from an initial polymerization reaction to a target polymerization reaction in a manner that reduces significantly the amount of off-grade product having excessively low density produced during the transition, including steps of: during the transition, maintaining a first one of a concentration ratio and a feed ratio at an at least substantially constant value while implementing process changes in an effort to bring produced polymer into compliance with a target specification set and monitoring (without controlling) the other one of the concentration ratio and the feed ratio to generate first data; and during the transition, determining from the first data whether polymer having excessively low density is likely to be produced during the transition, and upon determining that polymer having excessively low density is likely to be produced during the transition, maintaining during the remaining portion of the transition the other ratio at a value that is at least substantially constant while allowing the first ratio to vary is provided.
    • 用于控制从初始聚合反应转变为目标聚合反应的方法,其显着降低在转变期间产生的具有过低密度的低级产物的量,包括以下步骤:在转变期间,保持第一个 浓度比和进料比在至少基本恒定的值的同时,同时实施过程变化,努力使生成的聚合物符合目标规范集和监测(不控制)另一个浓度比和进料比 生成第一个数据; 并且在转变期间,从第一数据确定是否可能在转变期间产生具有过低密度的聚合物,并且在确定在转变期间可能产生密度过低的聚合物时,保持在剩余部分 提供了在允许第一比率变化的同时至少基本上恒定的值的另一比例的转变。