Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2008-04-01
2008-04-01
Pezzuto, Helen L (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S083000, C526S220000, C526S317100, C526S319000
Reexamination Certificate
active
07351781
ABSTRACT:
A controlled free radical polymerization process, which includes the steps of: adding a monofunctional iniferter compound to an oxygen-free solvent; heating the solution to a temperature sufficient to allow the iniferter compound to form two carbon centered radical residues; adding a first monomer composition comprising one or more monomers to the solution containing the radical containing residues; polymerizing the first monomer composition to form a quasi-living polymer; and optionally polymerizing a second monomer composition comprising one or more monomers, which are different than the first monomer composition. The resulting non-random copolymer having the general formula:in-line-formulae description="In-line Formulae" end="lead"?φ-[-Ap-Bs-]t-φin-line-formulae description="In-line Formulae" end="tail"?where A and B are different compositions of ethylenically unsaturated monomers; p is an integer from 1 to 1,000; s is an integer from 0 to 1,000; t is an integer from 1 to 100; and φ is a residue from the iniferter.
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O'Dwyer James B.
White Daniela
Diaz Robert A.
Pezzuto Helen L
PPG Industries Ohio Inc.
Uhl William J.
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