FIBER-REINFORCED, FLAME RETARDANT POLY(ESTER-CARBONATE) COMPOSITIONS

1 . A flame retardant composition comprising:

40-94 wt % of a poly(carbonate-bisphenol phthalate ester) comprising aromatic carbonate units and bisphenol phthalate ester units, and

optionally, 10-60 wt % % of a poly(carbonate-siloxane);

1-15 wt % of an organophosphorous flame retardant, present in an amount effective to provide 0.5-0.8 wt % of added phosphorous;

5-45 wt % of glass fibers;

optionally, 0.01-10 wt % of a flame retardant sulfonate salt;

optionally, 0.1-0.6 wt % of an anti-drip agent; and

optionally, 0.01-10 wt % of an additive composition

wherein the amount of the poly(carbonate-bisphenol phthalate ester), the organophosphorous flame retardant, the glass fibers, and the optional components total 100 wt %;

wherein a molded sample of the flame retardant composition has a UL 94 rating of V0 at a thickness of 1.2 millimeter.

2 . The flame retardant composition of claim 1 , wherein the poly(carbonate-bisphenol phthalate ester) has the formula

wherein

the weight ratio of carbonate units x to ester units y is 10:90-45:55, and

the ester units have a molar ratio of isophthalate to terephthalate from 98:2-88:12.

3 . The composition of claim 1 , wherein the organophosphorous flame retardant is monomeric, oligomeric, or polymeric, and is an aromatic phosphate, an aromatic phosphinate, an aromatic phosphite, an aromatic phosphonate, an aromatic phosphine oxide, or a combination thereof.

4 . (canceled)

5 . (canceled)

6 . The flame retardant composition of claim 1 , wherein the anti-drip agent is present and is polytetrafluoroethylene, polytetrafluoroethylene encapsulated styrene-acrylonitrile copolymer, or a combination thereof.

7 . (canceled)

8 . The flame retardant composition of claim 1 , wherein the organophosphorous flame retardant has a mass loss maximum below 420° C. as determined by thermogravimetric analysis at a heating rate if 20° C. per minute.

9 . The flame retardant composition of claim 1 , wherein the poly(carbonate-siloxane) is present in an amount effective to provide 2-6 wt % siloxane.

10 . The flame retardant composition of claim 1 comprising

40-79 wt % of the poly(carbonate-bisphenol phthalate ester),

10-35 wt % of the poly(carbonate-siloxane),

1-15 wt % of an organophosphorous flame retardant, present in an amount effective to provide 0.5-0.8 wt % of added phosphorous; and

10-30 wt % of the glass fibers.

11 . A flame retardant composition comprising:

30-89 wt % of a poly(carbonate-bisphenol phthalate ester) comprising aromatic carbonate units and bisphenol phthalate ester units, and

5-25 wt % of a poly(ester),

optionally, 5-25 wt % (polycarbonate-siloxane);

1-15 wt % of an organophosphorous flame retardant, present in an amount effective to provide 0.5-0.8 wt % of added phosphorous;

5-45 wt % of glass fibers;

optionally, 0.01-10 wt % of a flame retardant sulfonate salt;

optionally, 0.1-0.6 wt % of an anti-drip agent; and

optionally, 0.01-10 wt % of an additive composition

wherein the amount of the poly(carbonate-bisphenol phthalate ester), the poly(ester), the organophosphorous flame retardant, the glass fibers, and the optional components total 100 wt %;

wherein a molded sample of the flame retardant composition has a UL 94 rating of V0 at a thickness of 1.2 millimeter.

12 . The flame retardant composition of claim 11 , wherein the poly(carbonate-bisphenol phthalate ester) has the formula

wherein

the weight ratio of carbonate units x to ester units y is 10:90-45:55, and

the ester units have a molar ratio of isophthalate to terephthalate from 98:2-88:12.

13 . The composition of claim 11 , wherein the organophosphorous flame retardant is monomeric, oligomeric, or polymeric, and is an aromatic phosphate, an aromatic phosphinate, an aromatic phosphite, an aromatic phosphonate, an aromatic phosphine oxide, or a combination thereof.

14 . (canceled)

15 . (canceled)

16 . The flame retardant composition of claim 11 , wherein the anti-drip agent is present and is polytetrafluoroethylene, polytetrafluoroethylene encapsulated styrene-acrylonitrile copolymer, or a combination thereof.

17 . (canceled)

18 . The flame retardant composition of claim 11 , wherein the organophosphorous flame retardant has a mass loss maximum below 420° C. as determined by thermogravimetric analysis at a heating rate if 20° C. per minute.

19 . The flame retardant composition of claim 11 , wherein the poly(carbonate-siloxane) is present in an amount effective to provide 2-6 wt % siloxane.

20 . The flame retardant composition of claim 11 , wherein the poly(ester) is a poly(alkylene terephthalate), preferably a poly(ethylene terephthalate), poly(butylene terephthalate), poly(ethylene naphthanoate), poly(butylene naphthanoate), poly(cyclohexanedimethanol terephthalate), poly(propylene terephthalate), or a combination thereof, most preferably poly(butylene terephthalate).

21 . The flame retardant composition of claim 11 , comprising

30-84 wt % of the poly(carbonate-bisphenol phthalate ester),

10 to less than 20 wt % of the poly(alkylene terephthalate);

1-15 wt % of an organophosphorous flame retardant, present in an amount effective to provide 0.5-0.8 wt % of added phosphorous; and

5-45 wt % of glass fibers.

22 . The flame retardant composition of claim 11 , comprising

30-84 wt % of the poly(carbonate-bisphenol phthalate ester),

10 to less than 35 wt % of the poly(alkylene terephthalate);

1-15 wt % of an organophosphorous flame retardant, present in an amount effective to provide 0.5-0.8 wt % of added phosphorous; and

5-20 wt % of glass fibers.

23 . An article comprising the flame retardant composition of claim 1 .

24 . (canceled)

25 . A method for forming the article according to claim 23 , comprising molding, casting, or extruding the article.

26 . An article comprising the flame retardant composition of claim 11 .

27 . A method for forming the article according to claim 26 , comprising molding, casting, or extruding the article