Societe Chimique Des Charbonnages-Cdf Chimie

Agence Nationale De Valorisation De La Recherche (Anvar)

Agence Nationale De Valorisation De La Recherche

Societe Chimique Des Charbonnages

Patrick Guyot

Michel H Fontanille

Pierre Sigwalt

Jean-Pierre Vairon

New organo-lithium initiators, their synthesis, and their use. The initiators have the formula: ##STR1## in which R' is either a hydrogen atom or a methyl radical; either n is 1, in which case R'=H and m and p are integers, the sum of which is between 0 and 10 inclusive, or n is 2, R' then being an alkyl radical of 2 to 8 carbon atoms and m=p=o; and R is an alkyl radical of 1 to 4 carbon atoms. The initiators are prepared by reacting compounds of the formula; ##STR2## with an alkyl-lithium RLi in a non-polar solvent in the absence of any polar solvent or complexing agent. The initiators are used to prepare polydienes of high stereoregularity by reacting with a diene, and the polydiene is used to prepare a three-block or star copolymer by reacting with an anionically polymerizable monomer.

Bi- and Trifunctional organolithium initiators and applications thereof

Organo-lithium compounds of the formula: ##STR1## wherein R is an alkyl group of up to 5 carbon atoms, R' is either hydrogen or an alkyl group of up to 5 carbon atoms and n is an integer from 2 to 10. These bifunctional organo-lithium compounds are prepared without the use of any polar or complexing agent and are useful as polymerization initiators for the production of block copolymers.

Organo-lithium compounds and a process for their preparation

New organo-lithium initiators, their synthesis, and their use. The initiators have the formula: ##STR1## in which R' is either a hydrogen atom or a methyl radical; either n is 1, in which case R' = H and m and p are integers, the sum of which is between 0 and 10 inclusive, or n is 2, R' then being an alkyl radical of 2 to 8 carbon atoms and m =p =0; and R is an alkyl radical of 1 to 4 carbon atoms. The initiators are prepared by reacting compounds of the formula: ##STR2## with an alkyl-lithium RLi in a non-polar solvent in the absence of any polar solvent or complexing agent. The initiators are used to prepare polydienes of high stereoregularity by reacting with a diene, and the polydiene is used to prepare a three-block or star copolymer by reacting with an anionically polymerizable monomer.

1,1,1 Tris-(4-isopropenyl-phenyl)ethane

Diphenyl compounds that are intermediates in preparation of

New organo-lithium initiators, their synthesis, and their use. The initiators have the formula: ##STR1## IN WHICH R' is either a hydrogen atom or a methyl radial; either n is 1, in which case R' = H and m and p are integers, the sum of which is between 0 and 10 inclusive, or n is 2, R' then being an alkyl radical of 2 to 8 carbon atoms and m = p = 0; and R is an alkyl radical of 1 to 4 carbon atoms. The initiators are prepared by reacting compounds of the formula: ##STR2## WITH AN ALKYL-LITHIUM RLi in a non-polar solvent in the absence of any polar solvent or complexing agent. The initiators are used to prepare polydienes of high stereoregularity by reacting with a diene, and the polydiene is used to prepare a three-block or star copolymer by reacting with an anionically polymerizable monomer.

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Paris, France

Patrick Guyot