Patent ID: 7517634

Claim:
A polymer comprising the formula: [A] x [B] y [C] z wherein A, B and C are each individually one of wherein x is between about 0 and about 200 inclusive, y is between about 1 and about 200 inclusive and z is between about 1 and about 200 inclusive, provided B≠C wherein the polymer is prepared by a living free radical process (LFRP) in the presence of a chain transfer agent (CTA) having the formula: wherein R 1 is any group that can be expelled as its free radical form in an addition-fragmentation reaction; R 2 and R 3 are each independently selected from the group consisting of hydrogen, hydrocarbyl, substituted hydrocarbyl, heteroatom-containing hydrocarbyl, and substituted heteroatom-containing hydrocarbyl, and combinations thereof, and optionally R 2 and R 3 together to form a double bond optionally substituted alkenyl moiety; R 4 is selected from the group consisting of hydrogen, hydrocarbyl, substituted hydrocarbyl, heteroatom-containing hydrocarbyl, and substituted heteroatom-containing hydrocarbyl, and combinations thereof; and optionally, R 4 combines with R 2 and/or R 3 to form a ring structure, with said ring having from 3 to 50 non-hydrogen atoms; and D is either sulfur, selenium or tellurium.