申请人:Polymer Latex GmbH & Co. KG
公开号:EP1408059A1
公开(公告)日:2004-04-14
A latex having a reduced amount of 4-phenylcyclohexene is obtainable by a process comprising reacting A) 30-90% by weight of at least one ethylenically unsaturated monomer; B) 70-10% by weight of a diene; C) 1-10% by weight of α,β-unsaturated carboxylic acids, carboxylic acid nitriles, carboxylic acid amides, or mixtures thereof; and D) an auxiliary, an additive or mixtures thereof; wherein the sum of A, B and C is 100% by weight. The reaction follows a gradient regime for components A and B. In the gradient regime, an amount added per unit time of one of components A or B continuously increases, while simultaneously an amount added per unit time continuously decreases for one of components A or B which does not undergo the continuous increase; with the proviso that a starting molar ratio of A to B is adjusted from a range of 0.15 - 0.95 or 1.05 - 6.66 through at least one discontinuous change in the amount added per unit time to a target molar ratio of A to B, in the range of 1.05 - 6.66 or 0.15 - 0.95, and thereafter the change in the amount added per unit time is made i) constantly for A and B, and/or ii) decreasingly for A and ascendingly for B, and/or iii) decreasingly for B and ascendingly for A, in any sequence, individually or in combination.
一种 4-苯基环己烯含量降低的胶乳可通过以下工艺获得:A) 至少一种乙烯基不饱和单体 30-90%(重量);B) 二烯 70-10%(重量);C) α,β-不饱和羧酸、羧酸腈、羧酸酰胺或其混合物 1-10%(重量);以及 D) 助剂、添加剂或其混合物;其中 A、B 和 C 的总和为 100%(重量)。在梯度反应中,单位时间内 A 或 B 组分之一的添加量持续增加,同时单位时间内 A 或 B 组分之一的添加量持续减少,而 A 或 B 组分之一的添加量不持续增加;但 A 与 B 的起始摩尔比从 0.15 - 0.95 或 1.05 - 6.66的范围内,通过至少一次不连续的单位时间添加量的变化,达到A与B的目标摩尔比,在1.05 - 6.66或0.15 - 0.95的范围内,此后,单位时间添加量的变化是:i) A和B的持续变化,和/或ii) A的递减和B的递增,和/或iii) B的递减和A的递增,以任何顺序,单独或组合进行。