Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

HRID 895761Notes

Reaction equation

HRID 895761 reaction equation
[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.C([Li])(CC)C.C=CC=C>C1(C)C=CC=CC=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

5

Reactant 3

HCID 7501Styrene4×HCID 78451,3-Butadiene3×HCID 178418400CID 53628100

Product 1

HCID 62697Benzene, ethenyl-, polymer with 1,3-butadiene

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

After the first addition of a precalculated amount of anhydrous styrene to build up the S1 block, and 15 minutes of reaction time, further initiator solution (sec-butyllithium) was added to initiate further chains. Further blocks are built up by adding portions of anhydrous styrene and butadiene, and by simultaneous addition of anhydrous styrene and butadiene to build up a copolymer block. The reaction time to build up a styrene block was 15 minutes, and that for a butadiene block, and also that for a styrene-butadiene copolymer block, was 40 minutes. The copolymer blocks were coupled by adding Endenol D 82 (Henkel KGaA, 40% solution in toluene) at 50° C. within a period of 15 minutes, to give the star-block copolymer. 0.1% (based on the solids content of the star-block copolymer) of Kerobit TBK (2,6-di-tert-butyl-p-kresol) was added to stabilize the material.

Workup

  1. additionwas added
  2. customto give the star-block copolymer
  3. additionwas added

Sources & evidence

ORD record
ord-6814eaf4d48c4622be879262d0dbdc94
Source dataset
uspto-grants-2005_07
Patent number
US06916879B2

Reaction notes

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