Shell Oil Comapny

Arie Van Dongen

Jeroen Van Westrenen

Jacqueline M Veurink

Antonius A Broekhuis

Arien Kwantes

Helmuth Einberger

Hendrik A Groeneveld

Process for manufacturing block copolymers derived from predominantly styrene and predominantly isoprene, used in the form of an isoprene concentrate obtainable by contacting an isoprene concentrate, obtainable by removal of piperylene from a gasoline pyrrolysis fraction of hydrocarbons having 5 carbon atoms, with finely dispersed alkali metal and/or alkaline earth metal, and separating it from the free and bound metal, said process comprising at least the steps of polymerizing predominantly styrene monomer in an inert non-aromatic hydrocarbon solvent in the presence of a monofunctional organolithium initiator, adding predominantly isoprene monomer in the form of pretreated isoprene concentrate to the polymerization mixture, either adding a coupling agent to couple a predominant part of the living diblock copolymer or adding a second portion of predominantly styrene monomer, and adding a terminating agent.

Process for manufacturing isoprene containing block copolymers

A block copolymer composition comprising:

Block copolymer composition, hot melt adhesive composition containing

A process is provided for preparing block copolymer blend compositions, which process comprises the subsequent steps of polymerizing vinyl aromatic monomer, adding conjugated diene monomer to the polymerization mixture, adding more initiator, adding of a second portion of conjugated diene monomer, adding a second portion of vinyl aromatic monomer, and adding a terminating agent. A block copolymer composition is provided having a blend of a triblock copolymer A-B-B'-A' and a diblock copolymer B'-A'.

Process for the preparation of a block copolymer blend

An improved continuous process for preparing bisphenols from phenols and carbonyl compounds in the presence of an acidic ion-exchange resin is described wherein the reaction zone comprises at least two reactors in series and a part the effluent from at least one reactor, with the exception of the last reactor, is recycled.

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Amsterdam, Netherlands

Arie Van Dongen