Patent ID: 8901273

Claim:
A method of manufacture of an amorphous copolyester, comprising polymerizing the following components in the presence of an esterification catalyst: (a) a monomer of formula I wherein R 1 , R 2 , R 3 , and R 5 are each independently a C 1-3 alkyl group, a is 0-1, b is 0-4, c is 0-4 and d is 0-3, and each R 4 is independently hydrogen or a C 1-3 alkyl group; (b) a terephthalyl component selected from terephthalic acid, a di(C 1-3 alkyl) terephthalate, and combinations thereof, wherein the terephthalyl component is obtained by depolymerization of a terephthalyl-containing polyester; and (c) 1,4-cyclohexane dimethanol; wherein the units of monomer (a) are present in an amount from 7 to less than 12 mole % of the copolyester, the units of monomer (b) are present in an amount from 33 to less than 48 mole % of the copolyester, and the units of monomer (c) are present in an amount from 40 to 50 mole % of the copolyester, based on the moles of repeat units in the copolyester; and wherein the method further comprises heating the components to a temperature within the range of 220° C. to 270° C. during polymerization; and wherein the copolyester has a glass transition temperature of at least 107° C., an intrinsic viscosity of at least 0.7 dl/g, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256.