Isoprene → HCID 19842620, compound

HRID 1836668Notes

Reaction equation

HRID 1836668 reaction equation
[CH2:1]=[CH:2][C:3](=[CH2:5])[CH3:4].[CH2:6]=[CH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1>>[CH2:6]=[CH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.[CH2:1]=[CH:2][C:3](=[CH2:4])[CH3:5].[CH2:1]=[CH:2][C:3]1[CH:4]=[CH:8][CH:7]=[CH:6][CH:5]=1

Participants

3

Reactant 2

HCID 6557IsopreneHCID 7501Styrene

Product 1

HCID 19842620HCID 19842620, compound

Procedure

A 10 L stainless steel polymerization reactor was washed, dried and refluxed with dry nitrogen. Then, 78 g of styrene, 4,800 g of cyclohexane and 6 Ml of n-butyl lithium (2M solution in cyclohexane) were charged into the reactor. Polymerization was initiated at 40° C. and the mixture was stirred for 30 minutes. Then, 644 g of isoprene was added and polymerization was allowed to proceed for 30 minutes. 78 g of styrene was again added and continuous polymerization was allowed to proceed for 30 minutes thereby to give a linear styrene-isoprene-styrene polymer. 1 g trimethylsilylchloride ((CH3)3SiCl) was added, the reaction mixture was stirred for 10 minutes and then reaction was terminated. A polymer thus obtained was dried at 60° C. under reduced pressure for 24 hours to obtain a linear styrene-isoprene-styrene block copolymer. The content of styrene and the content of vinyl of isoprene in an obtained rubber, measured by 1H-NHR, were 19.5% by weight and 8% by weight respectively. The analysis by GPC indicated that the polymer had a number average molecular weight (Mn) of 141,450.

Workup

  1. washwas washed
  2. customdried
  3. temperaturerefluxed with dry nitrogen
  4. additionThen, 78 g of styrene, 4,800 g of cyclohexane and 6 Ml of n-butyl lithium (2M solution in cyclohexane) were charged into the reactor
  5. customPolymerization
  6. customwas initiated at 40° C.
  7. custompolymerization
  8. waitto proceed for 30 minutes
  9. customcontinuous polymerization
  10. waitto proceed for 30 minutes

Sources & evidence

ORD record
ord-6aa82b951f4443f1a6cb90cb63c1e73f
Source dataset
uspto-grants-2004_08
Patent number
US06777493B2

Reaction notes

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