A composition comprising an amorphous copolyester comprising: - the reaction product of (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 a di(C 1-3 alkyl) terephthalate, wherein the terephthalyl component is obtained from depolymerization of a terephthalyl-containing polyester; and (c) 1,4-cyclohexane dimethanol; wherein the monomer (a) units are present in an amount from 7 to less than 12 mole % of the copolyester, based on the moles of repeat units in the copolyester; and wherein the copolyester has a glass transition temperature of at least 107°C, as determined according to ASTM D3418, and intrinsic viscosity of at least 0.7dl/g, as determined by a viscometer in which the polymer sample was dissolved in a 60/40 mixture by volume% of phenol/1,1,2,2-tetrachloroethane solution, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256; - an additive, wherein the additive is selected from reinforcing fillers, non-reinforcing fillers, antioxidants, thermal stabilizers, radiation stabilizers, ultraviolet light absorbing additives, mold release agents, plasticizers, quenchers, lubricants, antistatic agents, dyes, pigments, laser marking additives, processing aids, and combinations thereof; and - an impact modifier. - the reaction product of (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 a di(C 1-3 alkyl) terephthalate, wherein the terephthalyl component is obtained from depolymerization of a terephthalyl-containing polyester; and (c) 1,4-cyclohexane dimethanol; wherein the monomer (a) units are present in an amount from 7 to less than 12 mole % of the copolyester, based on the moles of repeat units in the copolyester; and wherein the copolyester has a glass transition temperature of at least 107°C, as determined according to ASTM D3418, and intrinsic viscosity of at least 0.7dl/g, as determined by a viscometer in which the polymer sample was dissolved in a 60/40 mixture by volume% of phenol/1,1,2,2-tetrachloroethane solution, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256; (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 a di(C 1-3 alkyl) terephthalate, wherein the terephthalyl component is obtained from depolymerization of a terephthalyl-containing polyester; and (c) 1,4-cyclohexane dimethanol; wherein the monomer (a) units are present in an amount from 7 to less than 12 mole % of the copolyester, based on the moles of repeat units in the copolyester; and wherein the copolyester has a glass transition temperature of at least 107°C, as determined according to ASTM D3418, and intrinsic viscosity of at least 0.7dl/g, as determined by a viscometer in which the polymer sample was dissolved in a 60/40 mixture by volume% of phenol/1,1,2,2-tetrachloroethane solution, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256; - an additive, wherein the additive is selected from reinforcing fillers, non-reinforcing fillers, antioxidants, thermal stabilizers, radiation stabilizers, ultraviolet light absorbing additives, mold release agents, plasticizers, quenchers, lubricants, antistatic agents, dyes, pigments, laser marking additives, processing aids, and combinations thereof; and - an impact modifier.