Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1998-06-29
2000-11-21
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526176, 526177, 526178, 5263291, 5263292, 526346, 526347, 5263471, 556 52, 556 87, 556170, 556178, 556187, 556465, 556478, 568 1, 568 3, 502153, 502157, C08F 3604, C08F29702, C08F 446
Patent
active
061504874
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a multifunctional organic alkali metal initiator suitable for synthesizing various star polymers and its synthesis, the anionic polymerized star polymers of olefins prepared thereby and their preparing process. More particularly, the present invention relates to the multifunctional organic alkali metal initiator for anionic solution homopolymerization or solution copolymerization of monoolefin and/or diene and its synthesis, and also the polymerization process for polymerizing monoolefin and/or diene initiated by said initiator as well as its polymerization products.
BACKGROUND OF THE INVENTION
In recent years, using anionic polymerization technique to synthesize star polymers is increasingly stressed, its research scope is continuously enlarged, the said polymer species are growing day after day and a lot of which have embodied industrial production. The field involved was started from the star thermoplastic elastomer coupled star block copolymer of styrene-butadiene ((SB).sub.n R) and coupled star block copolymer of styrene-isoprene ((SI).sub.m R) at the very beginning, and developed now into coupled star random solution polymerized polystyrene-butadiene (S-SBR), low cis polybutadiene (LCBR), medium vinyl polybutadiene (MVBR), and high vinyl polybutadiene (HVBR), even into the latest styrene-isoprene-butadiene rubber (S-SIBR) etc.
There are generally two kinds of processes for anionically synthesizing star polymers. One is using multifunctional organic alkali metal initiator for the synthesis, especially the multifunctional organic lithium initiator; but up to now, the anionic process for synthesizing star polymers is usually a synthesis using a monofunctional alkyllithium as the initiator, firstly synthesizing linear polymer and then adding multifunctional coupling agent for carrying out the coupling reaction to obtain the final product.
Organic lithium initiator is widely used in the anionic polymerization, said organic lithium initiator may be divided into several sorts depending on the number of active centers each molecule contains after being initiated, i.e., monolithium initiator such as RLi; dilithium initiator such as naphthyllithium; and multifunctional organic lithium initiator (wherein the number of active centers each molecule contains is greater than two).
Multifunctional organic lithium initiator is principally used in star polymer synthesis. In comparison with linear high polymers, the star polymers have their own features, for example, in comparison with linear solution polymerized styrene-butadiene rubber, the star solution polymerized styrene-butadiene rubber has better overall mechanical performances after tire-making, mainly a lower rolling resistance, a better wet skid resistance, it is a kind of energy-saving rubber; for further example, in comparison with the linear products, the star medium, vinyl polybutadiene has significantly better processing performance and cold flow resistance; further, with respect to thermoplastic elastomer, the star SBS has, in comparison with linear SBS, higher Mooney viscosity, better tensile strength and higher heat resistance. In addition, the star polymer with particular terminal group has also wide applications in adhesives, liquid rubber etc.
However, this initiator is not much used in practice, because of inaccessibility starting materials, complex manufacture technology, and functionality being neither easily controlled nor regulated, although which can be used in the synthesis of star block copolymer (such as EP 0,210,016, U.S. Pat. No. 4,161,494, U.S. Pat. No. 4,196,153, U.S. Pat. No. 172,190 etc.), and is rarely used in the synthesis of other star polymers. For example, in GB 2124228, the initiator thereof is prepared by the addition of a divinyl aromatic hydrocarbon and an alkyllithium.
The process that RLi is used as the initiator in an aromatic hydrocarbon solvent to initiate a small amount of divinylbenzene (DVB) to prepare multifunctional organic lithium has already been reporte
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Jin Guantai
Zhang Xingying
Zhao Suhe
China Petro-chemical Corporation
Teskin Fred
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