The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 1979
Filed:
Jun. 17, 1977
Pierre Sigwalt, Saint Michel sur Orge, FR;
Patrick Guyot, Paris, FR;
Michel Fontanille, Montmorency, FR;
Societe Chimique des Charbonnages CDF Chimie, Paris, FR;
Agence Nationale de Valorisation de la Recherche, Neully sur Seine, FR;
Abstract
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.