Styrene → Styrene-butadiene-styrene

HRID 1938657Notes

Reaction equation

HRID 1938657 reaction equation
[CH2:1]1[CH2:6]CC[CH2:3][CH2:2]1.[CH2:7]=[CH:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.C([Li])(CC)C.C=CC=C>CO.O1CCCC1>[CH2:7]=[CH:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.[CH2:6]=[CH:1][CH:2]=[CH2:3].[CH2:7]=[CH:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1

Participants

7

Reactant 4

HCID 7501Styrene2×HCID 78451,3-ButadieneHCID 8078CyclohexaneHCID 178418400CID 53628100

Product 1

HCID 22280236Styrene-butadiene-styrene

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

Into a reaction vessel with a stirrer, 50 kg of cyclohexane, 1,750 g of well dehydrated styrene and 210 g of sec-butyl lithium (10% by weight, cyclohexane solution) were charged to carry out polymerization at 60° C. for 60 minutes. Next, 250 g of tetrahydrofuran was added and 6,500 g of butadiene was also added to carry out polymerization for 60 minutes. Then, 1,750 g of styrene was further added to carry out polymerization for 60 minutes. Thereafter, methanol was added to terminate the reaction. Thus, a styrene-butadiene-styrene type block copolymer was obtained. The block copolymer obtained was subjected to hydrogenation under the same conditions as in Reference Example 1 to give a hydrogenated product of the block copolymer (hereinafter simply referred to as "SEBS"). The SEBS thus obtained had a number average molecular weight of 76,100 and a styrene content of 35% by weight, where the ratio of hydrogenation was 98.9%.

Workup

  1. custompolymerization at 60° C. for 60 minutes
  2. custompolymerization for 60 minutes
  3. custompolymerization for 60 minutes
  4. customto terminate
  5. customthe reaction

Sources & evidence

ORD record
ord-de1b32a6765d4cef91aa05e28d2eff56
Source dataset
uspto-grants-1997_12
Patent number
US05693711

Reaction notes

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