Patent ID: 7282555
Filing Date: 2007-10-16
Classification: C08G,C08K,C09B

Abstract:
1. A method of incorporating a light absorber into a polyester resin, the method comprising: a) forming a reaction mixture substantially free of a titanium containing ester exchange catalyst compound and comprising combining: wherein: A is conjugated with the attached double bond and is selected from the group consisting of nitrogen containing moieties having the following formulae: R and R′ are independently selected from the group consisting of hydrogen, C n is 1 or 2; R R R R R R R R R R R R R X is selected from the group consisting of —O—, —NH and —N(R L is a di, tri or tetravalent linking group; L P and Q are independently selected from the group consisting of cyano, —COR P and Q can be combined with the conjugated double-bonded carbon atom to which they are attached to produce divalent radicals selected from the group consisting of the following formulae: wherein: R R R X X R and wherein the light absorbing compound includes a polyester reactive group; and b) polymerizing the reaction mixture in a polycondensation reaction system, the polycondensation reaction system having a first reaction chamber, a last reaction chamber, and one or more intermediate reaction chambers between the first reaction chamber and the last reaction chamber, wherein the reaction system is operated in series to progressively polymerize the reaction mixture in the first reaction chamber, the one or more intermediate reactions, and the last reaction chamber.