FLAME RETARDANT COPOLYESTER COMPOSITIONS

摘要

The present invention relates to the combination of halogen-free flame retardant additives in a copolyester to improve the flame retardant properties of the copolyester composition while retaining clarity and impact properties, methods of making the copolyester composition and articles made from the copolyester composition. More specifically, the present invention relates to the use of a polymeric sulfonyl and phosphonate containing flame retardant compound in copolyester compositions to improve the flame retardant properties while retaining clarity, glass transition temperature, impact properties, methods of making said copolyester compositions and articles therefrom.

主权项

1. A copolyester composition comprising:
(a) from greater than about 90 to about 98 wt % of the copolyester comprising
(i) a diacid component comprising
from 70 to 100 mole % residues of terephthalic acid,from 0 to 30 mole % residues of a modifying aromatic diacid having from 8 to 12 carbon atoms, andfrom 0 to 10 mole % residues of an aliphatic dicarboxylic acid; and(ii) a glycol component comprising
from 1 to 65 mole % cyclohexanedimethanol residues andfrom 35 to 99 mole % of a modifying glycol having 2 to 20 carbon atoms; (b) from about 2 to about 10 wt % of a flame retardant comprising a polymer comprising a sulfonyl moiety and a phenyl phosphonate moiety, wherein the copolyester composition has a UL 94 V-0 rating, wherein the energy at maximum load is greater than about 15 Joules according to ASTM D3763; wherein the copolyester composition has less than about 10% haze according to ASTM D1003, wherein the wt % is based on the weight of the copolyester, wherein the total mole % of the dicarboxylic acid component is 100 mole % and the total mole % of the glycol component is 100 mole %.