US 5,874,511 AGranted

Polymers of controlled molecular weight and end-group functionality

AssigneesE. I. Du Pont de Nemours and Company, Commonwealth Scientific and Industrial Research Organisation

InventorsEzio Rizzardo, Gordon Francis Meijs, San Hoa Thang

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Abstract

A process for the production of polymers by free radical polymerization, characterized in that there is added to the polymerization system one or more compounds of the general formula (A). ##STR1## where R.sup.1 is hydrogen or a group capable of activating the vinylic carbon towards free radical addition; Y is OR.sup.2 or CH.sub.2 X(R.sup.2).sub.n where R.sup.2 is an optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, or optionally substituted saturated, unsaturated or aromatic carbocyclic or heterocyclic ring; X is an element other than carbon selected from Groups IV, V, VI or VII of the Periodic Table or a group consisting of an element selected from Groups IV, V, or VI to which is attached one or more oxygen atoms; and n is a number from 0 to 3, such that the valency of the group X is satisfied and, when n is greater than 1, the groups represented by R.sup.2 may be identical or different.

Claims5

Dependent claims

A polymer comprising the reaction product of an unsaturated monomer, an initiator, and a chain transfer agent having the formula ##STR5## wherein:

R.sup.1 is an optionally substituted group selected from aryl, alkoxycarbonyl, aryloxycarbonyl, carboxy, acyloxy, carbamoyl and cyanol
Y is OR.sup.2 or CH.sub.2 X(R.sup.2).sub.n ;
R.sup.2 is selected from the group consisting of alkyl;
alkenyl;
alkynyl;
saturated, unsaturated and aromatic carbocyclic rings;
and saturated, unsaturated and aromatic heterocyclic rings;
each of said carbocyclic and heterocyclic rings having 3 to 14 atoms;
said R.sup.2 group optionally substituted with a substituent selected from the group consisting of hydroxy, amino, halogen, phosphonate, trialkylsilyl, allyl, cyano, epoxy, carboxylic acid and carboxlic acid ester, alkoxy and alkyl derivatives;
X is selected from the group consisting of sulfur, silicon, selenium, phosphorous, bromine, chlorine, tin, phosphonate, sulfoxide, sulfone, and phosphine oxide;
and
n is from 0 to 3 to satisfy the valency of X and, when greater than 1, the groups represented by R.sup.2 are the same or different;
the polymer having an end group combination selected from (i) and (ii):
(i) R.sup.2 and --C(O)R.sup.1,
(ii) X(R.sup.2)n and --C(CH.sub.2)R.sup.1.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/671,821Filed 24 Jun 1996 · continuation
Priority: AU PH9351/865 Dec 1986
Granted: 23 Feb 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

C07C 323/60
Having the sulfur atoms of the thio groups bound to acyclic carbon atoms of the carbon skeleton: with the carbon atom of at least one of the…
C07C 43/176
Containing six-membered aromatic rings: having unsaturation outside the aromatic rings
C07C 43/1787
Containing hydroxy or O-metal groups: containing six-membered aromatic rings and having unsaturation outside the aromatic rings
C07C 43/215
Having an ether-oxygen atom bound to a carbon atom of a six-membered aromatic ring: having unsaturation outside the six-membered aromatic rings

Family

Serial372,357Parent of this continuation · filed 5 Jun 1989
Serial731,393Parent of this continuation · filed 17 Jul 1991
Serial72,687Parent of this division · filed 7 Jun 1993
Serial325,496Parent of this continuation · filed 19 Oct 1994
US 5,385,996 AParent of this division
US 5,874,511 AThis patent

From the US filing history. Foreign family members aren’t listed.