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    • 3. 发明授权
    • Emulsion styrene-butadiene rubber
    • 乳液丁苯橡胶
    • US06469104B1
    • 2002-10-22
    • US09264937
    • 1999-03-09
    • Howard Allen ColvinMichael Leslie Senyek
    • Howard Allen ColvinMichael Leslie Senyek
    • C08L2502
    • C08L9/06B29L2030/002B60C1/0016C08F236/10Y02T10/862Y10T152/10495C08F2/22C08L2666/08C08F2/38
    • This invention discloses an emulsion styrene-butadiene rubber (SBR) that can be employed in manufacturing tire tread formulations that have rolling resistance and treadwear characteristics that are similar to those made with solution SBR but with improved traction characteristics. Thus, the emulsion SBR of this invention is superior in many respects for use in tire tread compounds to conventional solution SBR and conventional emulsion SBR. This invention more specifically discloses a styrene-butadiene rubber composition which is comprised of repeat units which are derived from styrene and 1,3-butadiene, wherein the styrene-butadiene rubber composition has a number average molecular weight as determined by thermal field flow fractionation which is within the range of about 50,000 to 150,000, and wherein the styrene-butadiene rubber has a light scattering to refractive index ratio which is within the range of 1.8 to 3.9. The subject invention further reveals a styrene-butadiene rubber composition which is comprised of repeat units which are derived from styrene and 1,3-butadiene, wherein a plot of log frequency versus storage modulus of the styrene-butadiene rubber composition crosses over a plot of log frequency versus loss modulus of the styrene-butadiene rubber composition at a log frequency within the range of 0.001 radians per second to 100 radians per second when conducted at 120° C. using parallel plate geometry in the dynamic oscillation frequency sweep of the styrene-butadiene rubber.
    • 本发明公开了一种乳液丁苯橡胶(SBR),其可用于制造具有滚动阻力和胎面特性的轮胎胎面配方,其类似于用溶液SBR制成但具有改进的牵引特性的轮胎胎面制剂。 因此,本发明的乳液SBR在许多方面在用于轮胎胎面胶料与常规溶液SBR和常规乳液SBR方面是优异的。 本发明更具体地公开了一种苯乙烯 - 丁二烯橡胶组合物,其由衍生自苯乙烯和1,3-丁二烯的重复单元组成,其中所述苯乙烯 - 丁二烯橡胶组合物具有通过热场流分馏确定的数均分子量, 在约50,000至150,000的范围内,并且其中所述苯乙烯 - 丁二烯橡胶的光散射与折射率之比在1.8至3.9的范围内。 本发明进一步揭示了苯乙烯 - 丁二烯橡胶组合物,其由衍生自苯乙烯和1,3-丁二烯的重复单元组成,其中苯乙烯 - 丁二烯橡胶组合物的对数频率对储能模量的曲线与 苯乙烯 - 丁二烯橡胶组合物的对数频率与损耗模量的对数频率在0.001弧度/秒至100弧度/秒的范围内,当在120℃下进行时,使用平行板几何形状在苯乙烯 - 丁二烯橡胶。
    • 4. 发明授权
    • Emulsion styrene-butadiene rubber
    • US06458884B1
    • 2002-10-01
    • US09690555
    • 2000-10-17
    • Howard Allen ColvinMichael Leslie Senyek
    • Howard Allen ColvinMichael Leslie Senyek
    • C08L5300
    • C08L9/06B29L2030/002B60C1/0016C08F236/10Y02T10/862Y10T152/10495C08F2/22C08L2666/08C08F2/38
    • This invention discloses an emulsion styrene-butadiene rubber (SBR) that can be employed in manufacturing tire tread formulations that have rolling resistance and treadwear characteristics that are similar to those made with solution SBR but with improved traction characteristics. Thus, the emulsion SBR of this invention is superior in many respects for use in tire tread compounds to conventional solution SBR and conventional emulsion SBR. This invention more specifically discloses a styrene-butadiene rubber composition which is comprised of repeat units which are derived from styrene and 1,3-butadiene, wherein the styrene-butadiene rubber composition has a number average molecular weight as determined by thermal field flow fractionation which is within the range of about 50,000 to 150,000, and wherein the styrene-butadiene rubber has a light scattering to refractive index ratio which is within the range of 1.8 to 3.9. The subject invention further reveals a styrene-butadiene rubber composition which is comprised of repeat units which are derived from styrene and 1,3-butadiene, wherein a plot of log frequency versus storage modulus of the styrene-butadiene rubber composition crosses over a plot of log frequency versus loss modulus of the styrene-butadiene rubber composition at a log frequency within the range of 0.001 radians per second to 100 radians per second when conducted at 120° C. using parallel plate geometry in the dynamic oscillation frequency sweep of the styrene-butadiene rubber.
    • 6. 发明授权
    • Dibenzyltrithiocarbonate molecular weight regulator for emulsion polymerization
    • 用于乳液聚合的二苄基二硫代碳酸酯分子量调节剂
    • US06369158B1
    • 2002-04-09
    • US09470413
    • 1999-12-22
    • Michael Leslie SenyekJoseph John KuligDane Kenton Parker
    • Michael Leslie SenyekJoseph John KuligDane Kenton Parker
    • C08F240
    • C08F212/08C08F236/10C08F2438/03C08F2/38
    • Mercaptans are normally used as chain transfer agents in emulsion polymerizations. The mercaptans used in commercial applications are typically complex mixtures of hundreds of similar compounds having boiling points within a narrow range. The chain transfer activity of different mercaptans with such mixtures can vary substantially. To further complicate the situation, the distribution of various mercaptans can also vary substantially between lots of material obtained from commercial sources. Thus, consistent molecular weight control is typically difficult to attain in free radical emulsion polymerizations. This invention is based upon the unexpected discovery that dibenzyltrithiocarbonate will act as a pure compound to effectively and consistently control molecular weight in free radical emulsion polymerizations. The polydispersity of polymers made using dibenzyltrithiocarbonate as a molecular weight regulator is similar to that obtained using conventional mercaptan systems. This invention more specifically discloses a process for controlling the molecular weight of a polymer synthesized by free radical emulsion polymerization that comprises polymerizing at least one monomer by free radical polymerization in an aqueous emulsion in the presence of dibenzyltrithiocarbonate. For instance, dibenzyltrithiocarbonate can be used as a molecular weight regulator in the synthesis of styrene-butadiene rubber by emulsion polymerization. Accordingly, this invention further discloses a process for synthesizing styrene-butadiene rubber (SBR) that comprises copolymerizing styrene monomer and 1,3-butadiene monomer by free radical polymerization in an aqueous emulsion in the presence of dibenzyltrithiocarbonate. The use of dibenzyltrithiocarbonate is inherently less odorous than the use of mercaptans.
    • 硫醇通常用作乳液聚合中的链转移剂。 在商业应用中使用的硫醇通常是沸点在几个范围内的数百种类似化合物的复杂混合物。 具有这种混合物的不同硫醇的链转移活性可以显着变化。 为了进一步使情况复杂化,各种硫醇的分布也可以在从商业来源获得的许多材料之间显着变化。 因此,在自由基乳液聚合中通常难以获得一致的分子量控制。 本发明基于意想不到的发现,即二苄基三硫代碳酸酯将用作纯化合物以有效且一致地控制自由基乳液聚合中的分子量。 使用二苄基三硫代碳酸酯作为分子量调节剂制备的聚合物的多分散性与使用常规硫醇体系获得的聚合物相似。 本发明更具体地公开了一种控制通过自由基乳液聚合合成的聚合物的分子量的方法,该方法包括在二苄基三硫代碳酸酯的存在下,在水乳液中通过自由基聚合使至少一种单体聚合。 例如,二苄基三硫代碳酸酯可以用作通过乳液聚合合成苯乙烯 - 丁二烯橡胶中的分子量调节剂。 因此,本发明还公开了一种合成苯乙烯 - 丁二烯橡胶(SBR)的方法,其包括在二苄基三硫代碳酸酯存在下,在水性乳液中通过自由基聚合共聚苯乙烯单体和1,3-丁二烯单体。 使用二苄基三硫代碳酸酯本身不如使用硫醇少。