Interior train components having low smoke and low heat release, and methods of their manufacture

A railway component, wherein the component is an extruded or molded interior train cladding comprising a thermoplastic composition comprising, based on the total weight of the composition:

• 3.5 to up to 12 wt. % of an organophosphorus compound;
• 88 to up to 96.5 wt. % of a first polymer, or a second polymer, or a combination comprising at least one of the foregoing polymers;
• and
• optionally, up to 5 wt. % of an additive selected from a processing aid, a heat stabilizer, an ultra violet light absorber, a colorant, or a combination comprising at least one of the foregoing, wherein
• the first polymer comprises:
• 2 to 20 mol % of bisphenol-A carbonate units of the formula
• greater than 60 to 98 mol % of isophthalic acid-terephthalic acid-resorcinol ester units of the formula
• and
• optionally, 1 to 20 mol % resorcinol carbonate units of the formula
• isophthalic acid-terephthalic acid-bisphenol-A ester units of the formula
• or a combination comprising at least one of the foregoing;
• the second polymer comprises
• 1 to 20 mol % of bisphenol A carbonate units of the formula
• greater than 60 to 90 mol % of isophthalic acid-terephthalic acid-resorcinol units of the formula
• and
• siloxane units in an amount effective to provide 0.1 to 10 wt. % of siloxane units, based on the weight of the second polymer,
• wherein the siloxane units are of the formula
• or a combination comprising at least one of the foregoing, wherein E has an average value of 2 to 90;
• wherein the aromatic organophosphorus compound is of the formula
• wherein
• each of R16, R17, R18 and R19 is phenyl, and
• X is of the formula
• each n is 1, and
• q is from 1 to 5;
• and
• wherein a sample of the thermoplastic composition has:
• a smoke density after 4 minutes (Ds-4) of equal to or less than 300 measured in accordance with ISO 5659-2 on a 3 mm thick plaque at 50 kW/m2,
• an integral of the smoke density as a function of time up to 4 minutes (VOF4) of equal to or less than 600 measured in accordance with ISO 5659-2 on a 3 mm thick plaque at 50 kW/m2,
• a maximum average heat release (MAHRE) of equal to or less than 90 kW/m2 measured in accordance with ISO 5660-1 on a 3 mm thick plaque at 50 kW/m2,
• a critical heat flux at extinguishment (CFE) of equal to or greater than 20 kW/m2 measured in accordance with ISO 5658-2 on a 3 mm thick plaque, and
• a ductility in multiaxial impact of 100%, measured at +23° C. at an impact speed of 4.4 m/second in accordance with ISO 6603 on 3.2 mm thick discs, and wherein the thermoplastic composition is free of a polyetherimide.

A railway component, wherein the component is a molded or extruded component comprising a thermoplastic composition comprising, based on the total weight of the composition,

• 3.5 to 12 wt. % of bisphenol A bis(diphenyl phosphate);
• 88 to 96.5 wt. % of a poly(bisphenol-A carbonate)-co-poly(isophthalate-terephthalate-resorcinol ester)-co-poly(siloxane) which comprises
• 1 to 20 mol % of bisphenol A carbonate units,
• greater than 60 to 90 mol % of isophthalic acid-terephthalic acid-resorcinol units, and
• siloxane units of the formula
• wherein E has an average value of 5 to 50, and the siloxane units are present in an amount effective to provide 0.1 to 10 wt. % of siloxane units, based on the weight of the poly(bisphenol-A carbonate)-co-poly(isophthalate-terephthalate-resorcinol ester)-co-poly(siloxane);
• and
• optionally, up to 5 wt. % of an additive selected from a processing aid, a heat stabilizer, an ultra violet light absorber, a colorant, or a combination comprising at least one of the foregoing,
• wherein a sample of the thermoplastic composition has:
• a smoke density after 1.5 min (Ds1.5) of less than or equal to 100 measured according to ASTM E662-12 in flaming and in non-flaming mode on a 3 mm thick plaque,
• smoke density after 4 min (Ds4) of less than or equal to 200 measured according to ASTM E662-12 in flaming and non-flaming mode on a 3 mm thick plaque, and
• a maximum flame spread index (Is) of 35 and less, without flaming running or dripping measured according to ASTM E162-12a on a 3 mm thick plaque, and wherein the thermoplastic composition is free of a polyetherimide.