Rail component comprising flame retardant compositions, and methods of manufacture

Patent metadata

Field	Value
Publication number	US-9453128-B2
Application number	US-201213436791-A
Country	US
Kind code	B2
Filing date	Mar 30, 2012
Priority date	Mar 31, 2011
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A railway vehicle component, wherein the component is a partition or a light cover, and wherein the component is molded or formed from a thermoplastic polymer composition comprising: a siloxane-containing copolymer in an amount effective to provide a total of 0.2 to 6.5 wt % of siloxane units based on the total weight of the polymers in the thermoplastic polymer composition, a bromine-containing polymer in an amount effective to provide 9 to 13 wt % of bromine, based on the total weight of the polymers in the thermoplastic polymer composition, and optionally a third polymer, wherein the wt % of the siloxane-containing copolymer, the bromine-containing polymer, and the optional third polymer, sum to 100 wt %, and 0.05 to 10 wt % of a light diffuser additive, based on the total weight of polymers in the thermoplastic polymer composition.

First claim

What is claimed is:

1. A railway vehicle component wherein the component is a partition or a light cover, and wherein the component is molded or formed from a thermoplastic polymer composition comprising:
a siloxane-containing copolymer in an amount effective to provide a total of 0.2 to 6.5 wt % of siloxane units based on the total weight of the polymers in the thermoplastic polymer composition,
a bromine-containing polymer in an amount effective to provide 9 to 13 wt % of bromine, based on the total weight of the polymers in the thermoplastic polymer composition, and
optionally a third polymer comprising carbonate units, imide units, etherimide units, arylene ether sulfone units, arylene ether units or a combination thereof, wherein the wt % of the siloxane-containing copolymer, the bromine-containing polymer, and the optional third polymer, sum to 100 wt %, and
0.05 to 10 wt % of a light diffuser additive, based on the total weight of polymers in the thermoplastic polymer composition;
wherein the thermoplastic polymer composition is free of polyarylester-polycarbonate copolymers comprising carbonate units and arylate ester units and the thermoplastic composition is free of polyalkylene esters; and
wherein a molded or formed sample of the thermoplastic polymer composition has
a transmission of 20% to 90% or a haze of 70% to 99.9%, each measured using the color space CIE 1931 (Illuminant C and a 2° observer) at a thickness of 3.2 mm,
an OSU integrated 2 minute heat release test value of less than 65 kW-min/m 2 and a peak heat release rate of less than 65 kW/m 2 , each measured using the method of FAR F25.4, in accordance with Federal Aviation Regulation FAR 25.853 (d), and
an E662 smoke test DsMax value of less than 200 when measured at a thickness of 1.6 mm.

2. A railway vehicle component wherein the component is a partition or a light cover, and wherein the component is molded or formed from a thermoplastic polymer composition comprising:
35 to 50 wt % of a bromine-containing polymer based on the total weight of polymers in the thermoplastic polymer composition, wherein the bromine-containing polymer is effective to provide 9 to 13 wt % of bromine, based on the total weight of the polymers in the thermoplastic polymer composition; and
20 to 65 wt % of a siloxane-containing copolymer based on the total weight of the polymers in the thermoplastic polymer composition, wherein the siloxane-containing copolymer comprises a first repeating unit and a poly(siloxane) unit having the formula:

wherein R is each independently C 1 -C 30 hydrocarbon group, and E has an average value of 5 to 200, and wherein the siloxane-containing copolymer is effective to provide a total of 0.2 to 6.5 wt % of siloxane units based on the total weight of the polymers in the thermoplastic polymer composition; and
wherein the first repeating unit of the siloxane-containing copolymer comprises a carbonate unit, an ester unit, an arylene sulfone unit, an arylene ether sulfone unit, an arylene ether ketone unit, or a combination comprising at least one of the foregoing units; and
optionally a third polymer, wherein the wt% of the siloxane-containing copolymer, bromine-containing polymer , and the optional third polymer, sum to 100 wt %, and
0.05 to 10 wt % of a light diffuser additive, based on the total weight of polymers in the thermoplastic polymer composition;
wherein a molded or formed sample of the thermoplastic polymer composition has
a transmission of 20% to 90% or a haze of 70% to 99.9%, each measured using the color space CIE 1931 (Illuminant C and a 2° observer) at a thickness of 3.2 mm,
an OSU integrated 2 minute heat release test value of less than 65 kW-min/m 2 and a peak heat release rate of less than 65 kW/m 2 , each measured using the method of FAR F25.4, in accordance with Federal Aviation Regulation FAR 25.853 (d), and
an E662 smoke test DsMax value of less than 200 when measured at a thickness of 1.6mm.

3. The railway vehicle component of claim 2 , wherein the siloxane-containing copolymer comprises
a first siloxane-containing copolymer having an average siloxane block length from 5 to 20, and a siloxane content of 0.5 to 2 wt % based on the weight of the siloxane-containing copolymer, wherein the first siloxane-containing copolymer contributes 0.2 to 6.5 wt. % of siloxane units, based on the total weight of the polymers in the thermoplastic polymer composition, and
an optional second siloxane-containing copolymer having an average siloxane block length from 25 to 65, and a siloxane content of 0.5 to 10 wt % based on the weight of the siloxane-containing copolymer, wherein the optional second siloxane-containing copolymer contributes 0 to 6.3 wt. % of siloxane units, based on the total weight of the polymers in the thermoplastic composition.

4. The railway vehicle component of claim 3 , comprising, based on the total weight of the polymers in the thermoplastic polymer composition,
20 to 65 wt. % of the first siloxane-containing copolymer, wherein the first siloxane-containing copolymer has an average siloxane block length from 5 to 15; and
0 to 55 wt % of the optional second siloxane-containing copolymer, wherein the second siloxane-containing copolymer has an average siloxane block length from 35 to 55.

5. The railway vehicle component of claim 2 , wherein the siloxane-containing copolymer comprises:
a first siloxane-containing copolymer having an average siloxane block length from 25to 65, and a siloxane content of 0.5 to 10 wt % based on the weight of the siloxane-containing copolymer, wherein the first siloxane-containing copolymer contributes 0.2 to 6.5 wt. % of siloxane units, based on the total weight of the polymers in the thermoplastic polymer composition, and
an optional second siloxane-containing copolymer having an average siloxane block length from 5 to 20, and a siloxane content of 0.5 to 2 wt % based on the weight of the siloxane-containing copolymer, wherein the optional second siloxane-containing copolymer contributes 0 to 1.5 wt. % of siloxane units, based on the total weight of the polymers in the thermoplastic composition.

6. The railway vehicle component of claim 5 , comprising, based on the total weight of the polymers in the thermoplastic polymer composition,
20 to 65 wt. % of the first siloxane-containing copolymer, wherein the first siloxane-containing copolymer has an average siloxane block length of 35 to 55; and
0 to 55 wt % of the optional second siloxane-containing copolymer, wherein the second siloxane-containing copolymer has an average siloxane block length from 5 to 15.

7. The railway vehicle component of claim 2 , wherein the siloxane-containing copolymer is a poly(carbonate-siloxane) derived from at least one dihydroxy aromatic containing polycarbonate unit, and at least one polysiloxane bisphenol of formula (1), formula (2), or a combination thereof:

wherein
R is each independently a C 1 -C 30 hydrocarbon group,
R 2 is each independently a C 7 -C 30 hydrocarbon group,
Ar is a C 6 -C 30 aromatic group and
E is the average number of siloxane units in each block.

8. The railway vehicle component of claim 7 , wherein
the siloxane-containing copolymer is a poly(carbonate-siloxane) comprising carbonate units derived from bisphenol A and poly(siloxane) units derived from a polysiloxane bisphenol of the formula

Assignees

• Sybert Paul Dean
• Hoover James Franklin
• Evans Thomas L
• Sabic Global Technologies Bv

Inventors

• Sybert Paul Dean
• Hoover James Franklin
• Evans Thomas L

Classifications

• C08K5/0041

  Optical brightening agents, organic pigments · CPC title

• Y10T428/1352

  Polymer or resin containing [i.e., natural or synthetic] · CPC title

• C08L63/00

  Compositions of epoxy resins; Compositions of derivatives of epoxy resins · CPC title

• C08L83/06

  containing silicon bound to oxygen-containing groups (C08L83/12 takes precedence) · CPC title

• C08L83/10 Primary

  Block- or graft-copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00) · CPC title