申请人:The Goodyear Tire & Rubber Company
公开号:US06998452B1
公开(公告)日:2006-02-14
This invention relates to a process for producing a free radical control agent of the structural formula:
wherein Z is selected from the group consisting of
wherein R1 is an alkyl group of 1 to 4 carbon atoms, cyclohexyl or phenyl; wherein R2 is an alkoxy group of 1 to 8 carbon atoms or a cycloalkoxy group of 5 to 8 carbon atoms; wherein Alk is a divalent hydrocarbon of 1 to 18 carbon atoms; and wherein Y represents a functional group that is capable of activating a vinylic carbon toward free radical addition; said process comprising the steps of (1) reacting a mercaptosilane of the structural formula: Z-Alk-SH with carbon disulfide in the presence of a phase transfer catalyst and an alkali metal hydroxide to produce a trithiocarbonate salt; and (2) reacting the trithiocarbonate salt with a halogen containing compound of the structural formula X-Y to produce the free radical control agent, wherein X represents a halogen atom. Such free radical control agents are capable of covalently bonding to silica/silicate surfaces and are of particular benefit in producing rubbery compounds that will be loaded with silica fillers, such as tire tread rubbers.
这项发明涉及一种制备自由基控制剂的过程,其结构式为:其中Z选自以下组合之一,其中R1是1至4个碳原子的烷基、环己基或苯基;其中R2是1至8个碳原子的烷氧基或5至8个碳原子的环烷氧基;其中Alk是1至18个碳原子的二价碳氢化合物;Y代表能够激活烯基碳原子朝向自由基加成的官能团;所述过程包括以下步骤:(1)在相转移催化剂和碱金属氢氧化物的存在下,将结构式为Z-Alk-SH的巯基硅烷与二硫化碳反应,生成三硫代碳酸盐;(2)将三硫代碳酸盐与结构式为X-Y的含卤化合物反应,生成自由基控制剂,其中X代表卤素原子。这种自由基控制剂能够共价结合到硅/硅酸盐表面,特别有益于生产将加载有二氧化硅填料(如轮胎胎面橡胶)的橡胶化合物。