Ultrahigh melt flow styrenic block copolymers
A block copolymer and block technology, which is applied in the direction of polymer adhesive additives, inks, coatings, etc., can solve the problems of unassisted molding and extrusion product preparation, smoke, undesired processing, etc.
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[0028] Preparation of block copolymers: The block copolymers can be prepared by anionic polymerization of styrene with a diene selected from butadiene, isoprene and mixtures thereof. Polymerization is accomplished by contacting styrene and diene monomers with an organoalkali metal compound in a suitable solvent at a temperature of -150°C to 300°C, preferably 0-100°C. Examples of anionic polymerization initiators include those having the general formula RLi n An organolithium compound, wherein R is an aliphatic, alicyclic, aromatic or alkyl-substituted aromatic hydrocarbon group having 1-20 carbon atoms, and n is 1-4. Preferred initiators include n-butyllithium and sec-butyllithium. Methods of anionic polymerization can be found in US Patent No. 4,039,593 and US Reissue Patent No. Re 27,145, which are incorporated herein by reference.
[0029] In one embodiment, a linear sequential block copolymer can be prepared by polymerizing styrene to form the first S block, adding a die...
Embodiment 1
[0065] Preparation of hydrogenated block copolymers by anionic polymerization of styrene and then butadiene followed by coupling followed by hydrogenation in the presence of microstructure control agents: Prepared by charging 6 L of cyclohexane and 342 g of styrene into a reactor Diblock Polymer Anion S-E 1 -Li. The reactor temperature was set at 50°C. Impurities were removed by adding small aliquots of sec-butyllithium until the first color appeared. 198 ml of about 12 wt% solution of tert-butyllithium in cyclohexane was added and the styrene was allowed to polymerize completely. The molecular weight of polystyrene produced in this reaction was determined by GPC to be 5,300 g / mol. 10 ml of 1,2-diethoxypropane was added, followed by 715 g of butadiene at a rate that allowed the temperature to remain at 60°C. The sample collected at the end of the butadiene polymerization had a styrene content of 36.5 wt% and a vinyl content of 79%, based on 1 H NMR, and total molecular weig...
Embodiment 2
[0069] Preparation of hydrogenated block copolymers by anionic polymerization of styrene and then butadiene followed by coupling followed by hydrogenation in the presence of microstructure control agents: Prepared by charging 6 L of cyclohexane and 300 g of styrene into the reactor Diblock Polymer Anion S-E 1 -Li. The reactor temperature was raised to 50 °C. Impurities were removed by adding small aliquots of sec-butyllithium until the first color appeared. 198 ml of about 12 wt% solution of tert-butyllithium in cyclohexane was added, and the styrene was completely polymerized at 60°C. The molecular weight of polystyrene produced in this reaction was determined by GPC to be 4,900 g / mol. 8 ml of 1,2-diethoxypropane was added, followed by 720 g of butadiene at a rate that allowed the temperature to remain at 60°C. The sample collected at the end of the butadiene polymerization had a styrene content of 32.4 wt% and a vinyl content of 79%, based on 1 H NMR, and total molecula...
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