Styrene → Styrene-butadiene-styrene

HRID 1022350Notes

Reaction equation

HRID 1022350 reaction equation
[CH2:1]=[CH:2][CH:3]=[CH2:4].[CH2:5]=[CH:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1>C1COCC1>[CH2:5]=[CH:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[CH2:1]=[CH:2][CH:3]=[CH2:4].[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

4

Reactant 2

HCID 7501StyreneHCID 78451,3-Butadiene

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a 200 L pressure resistant vessel flushed with dry nitrogen, 60 kg of cyclohexane and 35 g of sec-butyl lithium as a polymerization initiator were added followed by addition of 2.9 kg of styrene. After polymerization at 50 to 52° C., 0.17 kg of THF was added and 26.2 kg of butadiene and 2.9 kg of styrene were added in order for polymerization. As a result, a styrene-butadiene-styrene type block copolymer was obtained. The block copolymer obtained was hydrogenated by using Pd/C (palladium carbon) in cyclohexane with hydrogen pressure of 2.1 MPa and reaction temperature of 100° C. to obtain the hydrocarbon-based polymer-2. The hydrocarbon-based polymer-2 obtained has a weight average molecular weight of 100,400, styrene content of 18% by mass, and hydrogenation ratio of 99 mol %.

Workup

  1. customTo a 200 L pressure resistant vessel flushed with dry nitrogen, 60 kg of cyclohexane and 35 g of sec-butyl lithium as a polymerization initiator
  2. additionwere added
  3. additionfollowed by addition of 2.9 kg of styrene
  4. customAfter polymerization at 50 to 52° C.

Sources & evidence

ORD record
ord-ab68c944c51b489e8a36f11c7cfa3755
Source dataset
uspto-grants-2014_05
Patent number
US08722194B2

Reaction notes

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