Uniform molecular weight polymers
AssigneeEdison Polymer Innovation Corporation
InventorsGabor Kaszas, Judit E. Puskas, Joseph P. Kennedy
Life of this patent
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Abstract
A method for producing polymers with narrow molecular weight distribution which involves combining (1) an initiator component of the formula ##STR1## in which R.sub.1, R.sub.2, and R.sub.3 are alkyl, aryl, or aralkyl groups, and can be the same or different, and X is an acetate, etherate, a hydroxyl group, or a halogen, and i is a positive whole number, (2) a Lewis acid of the formula MX.sub.n in which M is titanium, aluminum, boron, or tin, X is a halogen, and n is a positive whole number, (3) an electron donor component having an electron donor number of from at least about 25 to no more than about 50, (4) a solvent for the preceding and (5) a hydrocarbon monomer component.
Claims10
A living polymerization process comprising initiating a polymerization by combining:
- (a) an initiator component of the formula ##STR3## in which R.sub.1, R.sub.2, and R.sub.3 are selected from the group consisting of alkyl, aryl, and aralkyl groups, and can be the same or different, and X is selected from the group consisting of an acetate, an etherate, a hydroxyl group and a halogen, and i is a positive whole number;
- (b) a Lewis acid component of the formula MX.sub.n in which M is titanium, aluminum, boron, or tin, X is a halogen and .sub.n is a positive whle number;
- (c) an electron donor component having an electron donor number of from at least about 30 to no more than about 50;
- (d) a hydrocarbon olefinic monomer component;
- and
- (e) a solvent for said components, wherein there is a correlation between the polarity of the solvent or mixture of solvents employed in the reaction, reflected by their dielectric constant, said dielectric constant being about equal to, or greater than about 7, and the donor number of the electron pair donor for the reaction, wherein said components are combined in amounts such that the number of moles of the Lewis acid component present at least about equals the number of combined moles of said initiator component and said electron donor component present, and at least about one mole of electron donor component is present for about every ten moles of initiator component present, and wherein the reaction solution thus formed is maintained at a temperature below about -10.degree. C. until the desired polymer has been formed.
A living polymerization process comprising a cationic polymerization system comprising initiating said cationic polymerization by combining:
- (a) an initiator component of the formula:
- ##STR4## in which R.sub.1, R.sub.2, and R.sub.3 are selected from the group consisting of alkyl, aryl, and arylalkyl groups, and can be the same or different, and X is selected from the group consisting of an acetate, an etherate, a hydroxyl group and a halogen, and i is a positive whole number;
- (b) a Lewis acid component of the formula MX.sub.n in which M is titanium, aluminum, boron, or tin, X of the Lewis acid is a halogen, and .sub.n is a positive whole number;
- (c) a hydrocarbon olefinic monomer component;
- (d) a solvent for said components;
- (e) an electron donor component having an electron donor number of from at least about 30 to no more than about 50 to reduce the M.sub.w //M.sub.n ration of the polymer to less than 1.5, wherein there is a correlation between the polarity of the solvent, or mixture of solvents employed in the reaction, reflected by their dielectric constant, said dielectric constant being about equal to, or greater than about 7, said components being combined in amounts such that the number of moles of the Lewis acid component present at least about equals the number of combined moles of said initiator component and said electron donor component present, and at least about one mole of electron donor component is present for about every ten moles of initiator component present, and wherein the reaction solution thus formed is maintained at a temperature below about -10.degree. C. until the desired polymer has formed.
Dependencies are inferred from the claim text.