Amine containing initiator system for anionic polymerization
AssigneeThe Dow Chemical Company
InventorsGrace Y. Lo, Eric W. Otterbacher, Massimo D. Bezoari, Brian W. Walther
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Abstract
Narrow molecular weight telechelic and/or block copolymers are prepared by anionic polymerization using an initiator composition comprising a multifunctional lithium initiator in combination with an organic diamine or triamine and optionally a metal alkoxide.
Claims17
A process for the polymerization of at least one anionically polymerizable monomer comprising contacting under anionic polymerization conditions the monomer with an initiator mixture comprising a multifunctional lithium containing compound corresponding to the formula:
- ##STR8## wherein:
- R.sub.1 is independently each occurrence hydrogen or an inert radical having from 0 to 16 carbon atoms;
- R.sub.2 is a divalent organic radical having at least 6 carbon atoms, R.sub.2 having at least one aromatic ring and the aromatic ring being directly attached to a carbon which is attached to an aromatic ring of the above formula;
- R.sub.3 is selected from the group consisting of alkyl, cycloalkyl, aromatic, mixed alkyl/aromatic and mixed cycloalkyl/aromatic radicals containing from 1 to 20 carbon atoms;
- and an organic diamine or triamine corresponding to the formula:
- ##STR9## wherein:
- R' independently each occurrence is a C.sub.2-20 alkadiyl group or an inertly substituted derivative thereof;
- R" independently each occurrence is a C.sub.1-20 alkyl group or an inertly substituted derivative thereof;
- and
- n is zero or one.
A polymerization initiator composition comprising a hydrocarbon solvent, a multifunctional lithium containing polymerization initiator corresponding to the formula:
- ##STR11## wherein:
- R.sub.1 is independently each occurrence hydrogen or an inert radical having from 0 to 16 carbon atoms;
- R.sub.2 is a divalent organic radical having at least 6 carbon atoms, R.sub.2 having at least one aromatic ring and the aromatic ring being directly attached to a carbon which is attached to an aromatic ring of the above formula;
- R.sub.3 is selected from the group consisting of alkyl, cycloalkyl, aromatic, mixed alkyl/aromatic and mixed cycloalkyl/aromatic radicals containing from 1 to 20 carbon atoms;
- and a diamine or triamine corresponding to the formula:
- ##STR12## R' independently each occurrence is a C.sub.2-20 alkadiyl group or an inertly substituted derivative thereof;
- R" independently each occurrence is a C.sub.1-20 alkyl group or an inertly substituted derivative thereof;
- and
- n is zero or one;
- wherein the ratio of diamine or triamine to multifunctional lithium compound (based on moles of diamine or triamine per equivalent of multifunctional lithium compound) is from about 0.005:1 to 1:1.
Dependencies are inferred from the claim text.