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    • 61. 发明授权
    • Process for synthesizing trans-1,4-polybutadiene
    • US06489415B2
    • 2002-12-03
    • US09730257
    • 2000-12-05
    • Wen-Liang HsuAdel Farhan Halasa
    • Wen-Liang HsuAdel Farhan Halasa
    • C08F446
    • C08F136/06C08F4/50C08F4/48
    • The process and catalyst system of this invention can be utilized to synthesize polybutadiene rubber having a high trans content and a low melting point by solution polymerization. The trans-polybutadiene rubber made by the process of this invention can be utilized in tire tread rubbers that exhibit outstanding wear characteristics. More importantly, the trans-polybutadiene rubber of this invention can be easily processed because of its low level of crystallinity. In fact, the trans-polybutadiene made by the process of this invention does not need to be heated in a “hot-house” before being used in making rubber compounds. This invention more specifically reveals a process for synthesizing trans-polybutadiene rubber which comprises polymerizing 1,3-butadiene in an organic solvent in the presence of a catalyst system which comprises (a) an organolithium compound, (b) a barium compound selected from the group consisting of (i) barium salts of cyclic alcohols, such as barium mentholate, and (ii) barium thymolate, and (c) an organoaluminum compound. The trans-polybutadiene made with the catalyst system of this invention typically has a glass transition temperature that is within the range of about -97° C. to about -90° C., a melting point that is within the range of about -30° C. to about 30° C., and a number average molecular weight that is within the range of about 50,000 to about 400,000.
    • 66. 发明授权
    • Process for controlling the molecular weight distribution of high
1,4-cis polybutadiene
    • 控制高1,4-顺式聚丁二烯分子量分布的方法
    • US6013746A
    • 2000-01-11
    • US93646
    • 1998-06-09
    • Young-Chan JangGwang-Hoon KwagDong-Il YoonA-Ju KimKyung-Nam Lim
    • Young-Chan JangGwang-Hoon KwagDong-Il YoonA-Ju KimKyung-Nam Lim
    • C08F36/06C08F4/609C08F136/06C08F236/06C08F4/80
    • C08F136/06
    • This invention relates to a process for controlling the molecular weight distribution of high 1,4-cis polybutadiene and more particularly, to a process of easily controlling the molecular weight distribution of polybutadiene which is concerned directly with the physical properties such as processability, in such a manner that preparation of high 1,4-cis polybutadiene is made available via polymerization of 1,3-butadiene in the presence of Ziegler-Natta catalyst, adding carboxylic acid represented by following formula I for the controlling of the molecular weight distribution of polybutadiene based on the contents of carboxylic acid, may be easily controlled, without any alternation in the 1,4-cis contents. ##STR1## Wherein R is selected from the group consisting of alkyl, cycloalkyl and arylalkyl groups substituted or unsubstituted with at least one or more halogen atoms, or alkyl, cycloalkyl and arylalkyl groups with at least one or more double bonds containing from 5 to 20 carbon atoms.
    • 本发明涉及一种控制高1,4-顺式聚丁二烯的分子量分布的方法,更具体地说,涉及容易控制聚丁二烯的分子量分布的方法,其直接关系到诸如加工性的物理性质 通过在齐格勒 - 纳塔催化剂存在下,通过1,3-丁二烯的聚合可得到制备高1,4-顺式聚丁二烯的方式,加入由下式I表示的羧酸以控制聚丁二烯的分子量分布 基于羧酸的含量,可以容易地控制,而在1,4-顺式含量中没有任何变化。 其中R选自被至少一个或多个卤素原子取代或未取代的烷基,环烷基和芳基烷基,或具有至少一个或多个含有5至20个碳原子的双键的烷基,环烷基和芳烷基。