US 6,103,846 A · Process for making anionic polymeric di-and polyfunctional polymers using protected functional initiators

Abstract

The preparation of di- or polyfunctional polymers by anionic polymerization using functionalized initiators having the structure R.sup.1 R.sup.2 R.sup.3 Si--A--B, wherein each R is methyl and A is a hydrocarbon bridging group containing from 1 to 25 carbon atoms, and B is an alkali metal, is improved when polymerization occurs in the presence of a polymerization termination inhibitor which is a metal alkyl which has been added at a concentration to afford a molar ratio of the termination inhibitor to living polymer chain ends of about 0.1:1 to about 10:1.

Claims19

Dependent claims

A process for making functionalized polymers, comprising the steps of:

(a) initiating polymerization of one or more anionically polymerizable monomers with an initiator having the structure ##STR15## wherein R.sup.1, R.sup.2, and R.sup.3 are independently selected from saturated and unsaturated aliphatic and aromatic radicals, A is a hydrocarbon bridging group containing from 1 to 25 carbon atoms, and B is an alkali metal;
(b) polymerizing one or more anionically polymerizable monomers in the presence of a polymerization termination inhibitor which is a metal alkyl;
and
(c) recovering a linear or branched polymer having one or more terminal functional groups.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

09/305,491Filed 5 May 1999

Granted

15 Aug 2000

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

C08F 4/72
Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors: selected from metals not provided for in group C08F4/44
C08F 4/58
Selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides: together…
C08F 36/04
The radical having only two carbon-to-carbon double bonds: conjugated
C08F
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

Process for making anionic polymeric di-and polyfunctional polymers using protected functional initiators

Life of this patent

Process for making anionic polymeric di-and polyfunctional polymers using protected functional initiators

Life of this patent

Abstract

Claims19