Thermoplastic composition with balanced chemical resistance and impact properties

A thermoplastic composition, comprising, based on the weight of the composition:

• 10 to 25 wt. % of a polyphenylene sulfone comprising the units of the formula
• 35 to 42 wt. % of a poly(bisphenol-A carbonate) homopolymer;
• 35 to 42 wt. % of a poly(carbonate-siloxane);
• and
• optionally, up to 5 wt. % of an additive selected from a processing aid, a heat stabilizer, an ultraviolet light absorber, a colorant, a flame retardant, or a combination comprising at least one of the foregoing,
• wherein the poly(carbonate-siloxane) comprises
• bisphenol A carbonate units, and
• siloxane units of the formula
• or a combination comprising at least one of the foregoing, wherein E has an average value of 2 to 200, wherein the poly(carbonate-siloxane) comprises 0.5 to 55 wt. % of siloxane units based on the total weight of the poly(carbonate-siloxane),
• wherein a sample of the composition has a notched Izod impact value of greater than or equal to 60 kJ/m2, measured at 23° C. according to ISO 180/1A using multipurpose 3.0 mm test specimen in accordance with ISO 3167 TYPE A;
• a tensile yield strength retention of 80% and higher after exposure of an ISO tensile bar for 24 hours to sunscreen under 0.5% strain compared to a non-exposed reference tested according to ISO 527;
• and
• an elongation at break retention of 80% and higher after exposure of an ISO tensile bar for 24 hours to sunscreen under 0.5% strain compared to a non-exposed reference tested according to ISO 527.

A thermoplastic composition, comprising, based on the weight of the composition:

• 5 to 30 wt. % of a polyphenylene sulfone comprising the units of the formula
• 50 to 80 wt. % of a poly(carbonate-siloxane);
• 10 to 20 wt. % of a poly(carbonate-arylate ester);
• and
• optionally, up to 5 wt. % of an additive selected from a processing aid, a heat stabilizer, an ultraviolet light absorber, a colorant, a flame retardant, or a combination comprising at least one of the foregoing,
• wherein the poly(carbonate-siloxane) comprises
• bisphenol A carbonate units, and
• siloxane units of the formula
• or a combination comprising at least one of the foregoing, wherein E has an average value of 2 to 200, wherein the poly(carbonate-siloxane) comprises 0.5 to 55 wt. % of dimethylsiloxane units based on the total weight of the poly(carbonate-siloxane),
• wherein the poly(carbonate-arylate ester) is a poly(bisphenol A carbonate)-co-(bisphenol phthalate ester) comprising 55 to 65 wt. % of the ester units, wherein the ester units have a molar ratio of isophthalate to terephthalate of 45:55 to 55:45, or a poly(bisphenol A carbonate)-co-(bisphenol phthalate ester) comprising 75 to 85 wt. % of the ester units, wherein the ester units have a molar ratio of isophthalate to terephthalate of 98:2 to 88:12, or a combination thereof, and
• wherein a sample of the composition has
• a notched Izod impact value of greater than or equal to 40 kJ/m2, measured at 23° C. according to ISO 180/1A using multipurpose 3.0 mm test specimen in accordance with ISO 3167 TYPE A;
• a tensile yield strength retention of 80% and higher after exposure of an ISO tensile bar for 24 hours to sunscreen under 0.5% strain compared to a non-exposed reference tested according to ISO 527;
• and
• an elongation at break retention of 80% and higher after exposure of an ISO tensile bar for 24 hours to sunscreen under 0.5% strain compared to a non-exposed reference tested according to ISO 527.