# US 4,391,935 A · Flame retardant polycarbonate composition

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- Number: US 4,391,935 A
- Document ID: US4391935A
- Status: Granted
- Kind: A
- Application number: 06/260,300
- Filed: 1981-05-04
- Granted: 1983-07-05
- Earliest claimed: 1974-08-09
- Assignees: General Electric Company
- Inventors: Charles A. Bialous; John B. Luce; Victor Mark
- Web page: https://patentgrep.com/patent/US4391935A

## CPC

- C08K 5/42: Sulfonic acids; Derivatives thereof
- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

An improved flame retardant polycarbonate composition of an aromatic carbonate polymer in admixture with an organic alkali metal salt or an organic alkaline earth metal salt or mixtures thereof, which composition has in admixture therewith a fluorinated polyolefin.

## Claims

### Claim 1

A composition meeting UL-94 V.sub.o requirements consisting essentially of (1) a non-halogenated aromatic polycarbonate, (2) a flame retardant effective amount of an alkali metal or alkaline earth metal salt of an organic acid of the group
unsubstituted monomeric or polymeric aromatic sulfonic acids,
monomeric or polymeric aromatic sulfonesulfonic acids,
sulfonic acids of aromatic ketones,
heterocyclic sulfonic acids,
halogenated non-aromatic carboxylic acids,
sulfonic acids of aromatic sulfides,
monomeric or polymeric aromatic ether sulfonic acids,
aliphatic and olefinic sulfonic acids,
monomeric or polymeric phenol ester sulfonic acids,
unsubstituted or halogenated oxocarbon acids,
sulfonic acids of monomeric and polymeric aromatic carboxylic acids and esters,
halocycloaliphatic aromatic sulfonic acids,
monomeric or polymeric aromatic amide sulfonic acids,
monomeric or polymeric aromatic sulfonic acids,
(3) and a non-dripping effective amount of an ASTM Type 3 polytetrafluoroethylene.

### Claim 2 (depends on 1)

The composition in accordance with claim 1 wherein the polytetrafluoroethylene is present in an amount of from about 0.01 to about 2.0 weight percent based on the total weight of the polycarbonate composition.

### Claim 3 (depends on 1)

The composition in accordance with claim 1 wherein the salt is sodium 2,4,5-trichlorobenzenesulfonate.