Process and catalyst for hydrogen mediated saline hydride initiated anionic chain transfer polymerization
AssigneeAlbemarle Corporation
InventorWilliam J. Layman, JR.
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Abstract
This invention relates to processes for forming hydrogen mediated saline hydride initiated anionic polystyrene distributions via novel polymerization conditions. This invention also relates to novel hydrocarbon soluble super active saline hydride catalyst and reagent compositions useful in conducting the hydrogen mediated saline hydride initiated polymerizations of this invention. This invention also relates to novel low molecular weight polystyrene polymer composition formed exclusively from styrene and molecular hydrogen as the monomers.
Claims30
A process for anionic chain transfer polymerization comprising feeding a vinyl aromatic and/or conjugated diene monomer under an atmosphere comprising molecular hydrogen to a reactor vessel containing a reaction mixture of an inert ethereal solvent and an alkali metal or alkali metal alloy.
A process for anionic chain transfer polymerization comprising feeding a vinyl aromatic and/or conjugated diene monomer under an atmosphere comprising hydrogen to a reaction mixture in a reactor vessel, wherein said reaction mixture was formed from (a) an organolithium compound;
- (b) a polytertiaryamine compound;
- (c) an alkoxide, wherein said alkoxide is an alkali metal alkoxide, or a magnesium alkoxide;
- (d) an optional aromatic hydrocarbon an aromatic hydrocarbon having at least one C—H covalent bond pKa within the range of 2.75 pKa units above that of the pKa of toluene to −4.30 pKa units below the pKa of toluene;
- and in (e) a hydrocarbon solvent having a pKa greater than H2.
A hydrocarbon soluble catalytic composition formed from:
- (a) molecular hydrogen;
- (b) an organolithium compound;
- (c) a polytertiaryamine compound;
- (d) an alkoxide, wherein said alkoxide is an alkali metal alkoxide, or a magnesium alkoxide;
- (e) an aromatic hydrocarbon having at least one C—H covalent bond pKa within the range of 2.75 pKa units above that of the pKa of toluene to −4.30 pKa units below the pKa of toluene;
- and (f) a hydrocarbon solvent;
- wherein the aromatic hydrocarbon and hydrocarbon solvent may be the same or different.
Dependencies are inferred from the claim text.