Makrolon and its article shaped

The problem of the present invention is to provide a kind of makrolon and its article shaped its mechanical strength, have heat resistance, and refractive index is small, and Abbe number is big, and birefringence is small, and the transparency is excellent.The present invention relates to a kind of makrolon, it is characterised in that it comprising intramolecular by having at least one linking group CH 2 The dihydroxy compounds of O dihydroxy compounds obtains with carbonic diester melt polycondensation, and the reduced viscosity of the makrolon is more than 0.40dl/g below 1.70dl/g, and formic acid content is less than 5 weight ppm.