Polyestercarbonate copolymers with high scratch resistance

摘要

Disclosed are polyestercarbonate copolymers comprising a carbonate unit of Formula (I), an ITR ester unit of Formula (V), and optionally a different carbonate unit of Formula (VI):;
wherein Ra, Rb, p, q, A, h, j, k, Rc, r, and R1 are as described herein. The polyestercarbonate copolymers have a combination of scratch resistance, good flow, and good weatherability.

主权项

1. An article formed from a polyestercarbonate terpolymer, the terpolymer comprising:
from about 30 to about 90 mole percent of a DMBPC unit of Formula (III): from about 5 to about 50 mole percent of an ITR ester unit of Formula (V):wherein h corresponds to the molar percentage of the isophthalate, j corresponds to the molar percentage of the resorcinolate, and k corresponds to the molar percentage of the terephthalate; h, j, and k add up to 100 mole percent of the ester unit; each Rc is independently selected from C1-12 alkyl and halogen; and r is an integer from zero to 3;
from about 5 to about 25 mole percent of a bisphenol A unit of Formula (VII):wherein the polyestercarbonate terpolymer has a scratch resistance of 15 micrometers or less, when measured using the Erichson Scratch Test with a 6N load; and a haze level below 5 and a light transmittance greater than 75%, as measured by ASTM D1003;
wherein the terpolymer is formed by mixing the DMPBC unit, the ITR ester unit, the bisphenol-A unit, and a chain transfer catalyst to form a mixture, wherein the chain transfer catalyst is present in the mixture in the amount of from 300 ppm to 400 ppm, and reacting the mixture to form the terpolymer.