Flame retardant polyimide/polyester-polycarbonate compositions, methods of manufacture, and articles formed therefrom
View Patent ↗A composition is disclosed, comprising, based on the total weight of the composition, from 20 to 60 wt. % of a polyimide having a glass transition temperature above 180° C.; from 10 to 30 wt. % a polyester-polycarbonate copolymer; from 30 to 60 wt. % of a reinforcing filler; and at least two flame retardant additives selected from the group consisting of from 0.01 to 0.5 wt. % of a first sulfonate salt, from 0.01 to 0.5 wt. % of a second sulfonate salt, from 0.5 to 5 wt. % of a siloxane copolymer, and combinations thereof. An article molded from the composition attains an improved UL94 rating, as compared to an article molded from the same composition without the at least two flame retardant additives.
1. A composition comprising, based on the total weight of the composition,
from 20 to 60 wt. % of a polyimide having a glass transition temperature above 180° C.;
from 10 to 30 wt. % a polyester-polycarbonate, wherein the content of ester units is from greater than 0 to 60 wt. % of the polyester-polycarbonate;
from 30 to 60 wt. % of a reinforcing filler;
from 0.01 to 0.15 wt. % of potassium diphenyl sulfone sulfonate;
from 0.01 to 0.5 wt. % of sodium toluene sulfonate; and
from 0.5 to 1 wt. % of a siloxane copolymer comprising a polyetherimide-siloxane copolymer;
wherein
the polyimide is a polyetherimide derived from the reaction of bisphenol-A dianhydride, oxydiphthalic anhydride, or a combination thereof, with m-phenylenediamine, p-phenylenediamine, a diamino diaryl sulfone, or a combination thereof;
the polyester-polycarbonate comprises poly(isophthalate-terephthalate-resorcinol ester)-co-(bisphenol-A carbonate);
the ratio of potassium diphenyl sulfone sulfonate to sodium toluene sulfonate is 2.5:1 to 6:1; and
an article molded from the composition attains a UL94 rating of V0 at a thickness of 0.83 mm without dripping.
2. The composition of claim 1 , comprising less than 3 wt. % of bromine and chlorine, based on the total weight of the composition.
3. The composition of claim 1 , having a halogen content of less than or equal to 1000 parts by weight of halogen per million parts by weight of the total composition.
4. The composition of claim 1 , comprising less than 1 wt. % bromine and chlorine based on the total weight of the composition.
5. The composition of claim 1 , comprising, based on total weight of the composition, from 0.1 to 0.15 wt. % of potassium diphenyl sulfone sulfonate and from 0.05 to 0.1 wt. % of the sodium toluene sulfonate.
6. The composition of claim 1 , comprising, based on the total weight of the composition, from 0.15 to 0.25 wt. % of the sodium toluene sulfonate.
7. The composition of claim 1 , comprising, based on the total weight of the composition, from 0.1 to 0.3 wt. % of sodium toluene sulfonate.
8. The composition of claim 1 , wherein an article molded from the composition has a heat distortion temperature of greater than or equal to 170° C., measured in accordance with ASTM method D648 at 0.46 MPa on a 3.2 mm sample.
9. The composition of claim 1 , wherein the siloxane copolymer comprises from 20 to 50 wt. % of diorganosiloxane units, based on the weight of the siloxane copolymer.
10. The composition of claim 1 , wherein the polyester-polycarbonate comprises, based on the total weight of the polyester-polycarbonate, from greater than 0 to 60 weight percent of the isophthalate-terephthalate-resorcinol units.
11. A method of manufacture of the composition of claim 1 , comprising melt blending the components of the composition of claim 1 .
12. An article comprising the composition of any of claims 1 - 4 .
13. The article of claim 12 , selected from the group consisting of a sheet, film, multilayer sheet, multilayer film, molded part, extruded profile, coated part, and fiber.
14. A method of forming an article, comprising shaping, extruding, blow molding, or injection molding the composition of claim 1 to form the article.