POLYESTERS CONTAINING AN INFRARED ABSORBING MATERIAL

摘要

Polyesters are disclosed which contain an infrared absorbing material comprising graphite, wherein said polyester is made by the reaction of one or more dicarboxylic acids having from 8 to 40 carbon atoms, or esters thereof, with one of more diols having from 2 to 8 carbon atoms and/or glycol ethers having from 4 to 10 carbon atoms, wherien said graphite is present from 0.1 to 15 parts by weight per million by weight of said polyester and has an average particle size of from 0.1 to 20 mu m, and wherein said polyester has a Hunter a* coordinate value of from -2.0 to +2.0, a Hunter b* coordinate value of from -3.0 to +2.0, and a Hunter L* value of greater than 65 or wherien said polyester is a moulded preform article, having a Hunter a* coordinate value of from -3.0 to +3.0, a Hunter b* coordinate value of from -5.0 to +7.0, and a Hunter L* value of greater than 65, as measured on a moulded bottle preform having a sidewall corss-sectional thickness of about 3.175 mm (0.125 inch). In another embodiment of the invention preformed articles or beverage bottles made of said polyesters are disclosed.