Compositions and articles of manufacture containing branched polycarbonate
View Patent ↗A thermoplastic composition comprises: 35 to 45 weight percent of a branched, end capped polycarbonate, 55 to 70 weight percent of a poly(aliphatic ester-carbonate) having a weight average molecular weight of 15,000 to 25,000, a non-flourinated sulfonate salt flame retardant and a polysiloxane. Weight percent is based on the combined weight of the branched, end capped polycarbonate and poly(aliphatic ester-carbonate).
1. A thermoplastic composition comprising:
35 to 45 weight percent of a branched, end capped polycarbonate;
55 to 65 weight percent of a poly(aliphatic ester-carbonate) having a weight average molecular weight of 15,000 to 25,000;
a non-flourinated sulfonate salt flame retardant; and
a polysiloxane, wherein weight percent is based on the combined weight of the branched, end capped polycarbonate and poly(aliphatic ester-carbonate).
2. The composition of claim 1 , wherein the composition has a melt volume flow rate of 15 to 40 cubic cm/10 min measured at 300° C. under a load of 1.2 kg, according to ASTM D 1238 at 6 minutes.
3. The composition of claim 1 , wherein the composition has a multi-axial impact ductility greater than or equal to 80% at 23° C. determined accordingly to ASTM D3763 at 23° C. and 3.2 mm.
4. The composition of claim 1 , wherein the composition has flame retardance of V1 according to UL94 at a thickness of 3.0 millimeters.
5. The composition of claim 1 , wherein the composition has a flame retardance of V0 according to UL94 at a thickness of 3.0 millimeters.
6. The composition of claim 1 , wherein the end-capping agents are selected from at least one of the following: phenol or a phenol containing one or more substitutions with at least one of the following: aliphatic groups, olefinic groups, aromatic groups, halogens, ester groups, cyano groups, and ether groups.
7. The composition of claim 6 wherein the end-capping agents are selected from at least one of the following: phenol, p-t-butylphenol, cyanophenol, and p-cumylphenol.
8. The composition of claim 1 , wherein the polycarbonate of said composition has a branching level greater than or equal to 3 mol %.
9. The composition of claim 1 , wherein the flame-retardant comprises potassium diphenylsulfone sulfonate and sodium toluene sulfonate.
10. The composition of claim 1 , wherein the composition has a haze value less than or equal to 1.5% and a light transmittance greater than or equal to 85% at a thickness of 3.2 mm as determined by ASTM D1003.
11. A thermoplastic composition comprising: 30 to 45 weight percent of a branched, end capped polycarbonate, 55 to 70 weight percent of a combination of a first poly(aliphatic ester-carbonate) having a weight average molecular weight of 15,000 to 25,000 and a second poly(aliphatic ester-carbonate) having a weight average molecular weight of 30,000 to 40,000, a non-flourinated sulfonate salt flame retardant and a polysiloxane wherein the weight ratio of the first poly(aliphatic ester-carbonate) to the second poly(aliphatic ester-carbonate) is 3:4 to 5:2 and weight percent is based on the combined weight of the branched, end capped polycarbonate and poly(aliphatic ester-carbonate).
12. The composition of claim 11 , wherein the composition has a melt volume flow rate of 15 to 20 cubic cm/10 min measured at 300° C. under a load of 1.2 kg, according to ASTM D 1238 at 6 minutes.
13. The composition of claim 11 , wherein the composition has a multi-axial impact ductility greater than or equal to 80% at 23° C. determined accordingly to ASTM D3763 at 23° C. and 3.2 mm.
14. The composition of claim 11 , wherein the end-capping agents are selected from at least one of the following: phenol or a phenol containing one or more substitutions with at least one of the following: aliphatic groups, olefinic groups, aromatic groups, halogens, ester groups, cyano groups, and ether groups.
15. The composition of claim 14 wherein the end-capping agents are selected from at least one of the following: phenol, p-t-butylphenol, cyanophenol, and p-cumylphenol.
16. The composition of claim 11 , wherein the polycarbonate of said composition has a branching level greater than or equal to 3 mol %.
17. The composition of claim 11 , wherein the flame-retardant comprises potassium diphenylsulfone sulfonate and sodium toluene sulfonate.
18. The composition of claim 11 , wherein the composition has a haze value less than or equal to 1.5% and a light transmittance greater than or equal to 85% at a thickness of 3.2 mm as determined by ASTM D1003.
19. The composition of claim 11 , wherein the composition has flame retardance of V1 according to UL94 at a thickness of 3.0 millimeters.
20. The compositions of claim 11 , wherein the composition has a flame retardance of V0 according to UL94 at a thickness of 3.0 millimeters.