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AssigneeAto Chimie
InventorsPierre Poisson, Georges Sturtz
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New fire-resistant transparent (co)polycarbonates containing alkaline diesters or hemiesters of bis (hydroxy-4-phenyl) alkylphosphonic acids, with the following general formulae (I) or (II): ##STR1## (I) where n=1, 2 or 3 (II) where n=0, 1, 2 or 3 and where R.sub.1 or R.sub.2 is a methyl or ethyl radical, and M is an alkaline metal, such as sodium or potassium.
New fire-resistant (co)polycarbonates, the macromolecular chain of which comprises recurrent functions derived from alkaline diesters or hemiesters of bis (hydroxy-4-phenyl) alkylphosphonic acids, with the following general formula (A) or (B):
New fire-resistant (co)polycarbonates containing (a) 0.5 to 100 mole % of units (A) having the general formula ##STR48## where E represents the divalent group deriving, by loss of the hydrogen atoms of the hydroxy groups, from a diester of a bis(hydroxy-4-phenyl) alkylphosphonic acid with the formula (I):
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
The acid moiety containing a substituent or a structure which is considered as characteristic: esters of arylalkanephosphonic acids
Containing atoms other than carbon, hydrogen or oxygen: containing phosphorus
Acyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
Term ended 1 Feb 2000 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention concerns new (co)polycarbonates containing alkaline diesters or hemiesters of bis (hydroxy-4-phenyl) alkylphosphonic acids; and possessing fire-resistant properties.
Polycarbonates are themselves self-extinguishing materials. For a number of uses in the building, domestic appliance and aeronautical engineering fields, however, this intrinsic fire resistance needs to be improved.
Products already used to fire-proof polycarbonates include halides such as decabromodiphenyl ether as additive, or tetrachloro- or tetrabromobisphenol A as polycondensation agent. But when these products are used, there is a danger of toxic, corrosive halohydric acids (HCl or HBr) being released during combustion.
The invention is illustrated by, without being confined to, the following examples.
Using apparatus consisting of a 1-liter balloon-flask with 5 tubes, equipped with an agitator, upward cooler, thermometer, inlet bulb, and an electrode to measure the pH-value, 36.4 g diethyl bis (hydroxy-4-phenyl) 2.2 propylphosphonate (0.1 mole) were dissolved in 150 ml of a 1.56 N soda solution obtained by dissolving 9.4 g soda pellets (0.235 mole) in 150 ml ion-exchanged water.
0.35 g ammonium triethylbenzyl chloride (molar ratio to bisphenol phosphonate 1.5), 0.1 g phenol (molar ratio to bisphenol phosphonate 1), and 170 ml methylene chloride, which had first been passed through a 4 A molecular sieve to remove stabilization alcohols (methanol and ethanol), were then added in turn to the solution.