Isoprene → HCID 19842620, compound

HRID 1648464Notes

Reaction equation

HRID 1648464 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[CH2:9]=[CH:10][C:11](=[CH2:13])[CH3:12]>C1CCCCC1>[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[CH2:9]=[CH:10][C:11](=[CH2:12])[CH3:13].[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

4

Reactant 2

HCID 6557IsopreneHCID 7501Styrene2×

Product 1

HCID 19842620HCID 19842620, compound

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Procedure

A pressure-proof vessel equipped with a stirrer was charged with 3,000 g of cyclohexane, 50 g of sufficiently dewatered styrene and 0.01 mole of lithium sec-butyl and polymerization was effected at 60° C. for 60 minutes. Thereafter, 200 g of isoprene was added and polymerization was effected for 60 minutes, and then 50 g of styrene was added and polymerization was effected for 60 minutes, to obtain a styrene-isoprene-styrene block copolymer. The block copolymer thus obtained had a styrene content of 33% and a number average molecular weight of 35,000. To the polymer solution, a palladium catalyst was added in an amount of 1% by weight/polymer and hydrogenation was conducted under an atmosphere of 50 kg/cm2 of hydrogen, to obtain a block copolymer with hydrogenation ratio of 90%. This was named SEPS-1.

Workup

  1. customA pressure-proof vessel equipped with a stirrer
  2. custompolymerization
  3. waitwas effected for 60 minutes
  4. custompolymerization
  5. waitwas effected for 60 minutes

Sources & evidence

ORD record
ord-c2f01c623fd84d93b01325cfeb0169ee
Source dataset
uspto-grants-1995_07
Patent number
US05436295

Reaction notes

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