US 4,535,135 A · Associations of bases, resulting from the combination of a lithium alkyl or aryl with an alkali metal amide or hydride, polymerization process in which they are used, and product obtained

Abstract

The invention relates to new associations of strong bases, having the following general formula: n' RLi--n MZ in which: n and n' are the numbers of mols of each compound, R is an alkyl or aryl radical, M is an alkali metal chosen from amongst lithium, sodium or potassium and Z is a hydride or an inorganic amide, the ratio n/n' being between 0.2 and 50. It is preferred to use bases in which the metal of the alkali metal amide or hydride is potassium or sodium. These associations are formed very rapidly and can be applied to anionic polymerization, in particular of conjugated dienes, in a solvent of low polarity or an apolar solvent. The polymers thus obtained contain a high percentage of 1,2 or 3,4 structures.

Claims11

Dependent claims

Process for the polymerisation or copolymerisation of vinylic, heterocyclic or diene monomers capable of undergoing anionic polymerisation by the opening of an ethylenic double bond or an heterocyclic ring, wherein said monomers are initiated, in the presence or absence of a solvent, with an association of bases, of formula:

n'RLi--nMZ
wherein n and n' are the numbers of mols of each compound, R is alkyl or aryl, M is sodium or potassium and Z is an hydride or an inorganic amide, the ratio n/n' being between 0.2 and 50.

Dependencies are inferred from the claim text.

Facts

Application

06/544,807Filed 24 Oct 1983 · division

Priority

FR 81 0085419 Jan 1981

Granted

13 Aug 1985

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

C08F 36/04
The radical having only two carbon-to-carbon double bonds: conjugated
C08F 4/461
Selected from alkali metals: catalysts containing at least two different components covered by the same or by different subgroups of group…
C08F 4/565
Alkali metals being the only metals present, e.g. Alfin catalysts: lithium being present, e.g. butyllithium + sodiumphenoxide
C08F
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

Associations of bases, resulting from the combination of a lithium alkyl or aryl with an alkali metal amide or hydride, polymerization process in which they are used, and product obtained

Life of this patent

Associations of bases, resulting from the combination of a lithium alkyl or aryl with an alkali metal amide or hydride, polymerization process in which they are used, and product obtained

Life of this patent

Abstract

Claims11