WO2000077012A1 - Bisphenol-a bis(diphenyl phosphate)-based flame retardant - Google Patents

Bisphenol-a bis(diphenyl phosphate)-based flame retardant Download PDF

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Publication number
WO2000077012A1
WO2000077012A1 PCT/US2000/015598 US0015598W WO0077012A1 WO 2000077012 A1 WO2000077012 A1 WO 2000077012A1 US 0015598 W US0015598 W US 0015598W WO 0077012 A1 WO0077012 A1 WO 0077012A1
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WIPO (PCT)
Prior art keywords
bisphenol
flame retardant
area
bis
diphenyl phosphate
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PCT/US2000/015598
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English (en)
French (fr)
Inventor
William B. Harrod
W. Dirk Klobucar
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Albemarle Corporation
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Publication date
Application filed by Albemarle Corporation filed Critical Albemarle Corporation
Priority to EP00939617A priority Critical patent/EP1194435A1/en
Priority to JP2001503869A priority patent/JP2003502451A/ja
Publication of WO2000077012A1 publication Critical patent/WO2000077012A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
    • C08K5/523—Esters of phosphoric acids, e.g. of H3PO4 with hydroxyaryl compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic System
    • C07F9/02—Phosphorus compounds
    • C07F9/06—Phosphorus compounds without P—C bonds
    • C07F9/08—Esters of oxyacids of phosphorus
    • C07F9/09—Esters of phosphoric acids
    • C07F9/12—Esters of phosphoric acids with hydroxyaryl compounds

Definitions

  • This invention relates to a novel liquid flame retardant having a high bisphenol-A bis(diphenyl phosphate) content.
  • Bisphenol-A bis(diphenyl phosphate) is a well known flame retardant for use in normally flammable resins and is especially useful in flame retarding polycarbonate/acrylonitrile-butadiene- styrene (PC/ABS) compositions. It also finds use as a flame retardant in polyphenylene oxide/styrene compositions.
  • this invention provides a bisphenol-A bis(diphenyl phosphate) monomer-based flame retardant which is a liquid at room temperature, i.e., 20 to 25°C, and which is resistant to the formation of crystals over time.
  • this invention provides a flame retardant comprising bisphenol-A bis(diphenyl phosphate) and its dimer, the former having from 78 to 87 HPLC area % and from about 85 to less than 90 normalized area %, the normalized area % being based on the total HPLC area % of the bisphenol-A bis(diphenyl phosphate) and the dimer.
  • this invention provides a bisphenol-A bis(diphenyl phosphate)-based flame retardant having a low isopropenylphenyl diphenyl phosphate content.
  • this invention provides a bisphenol-A bis(diphenyl phosphate)-based flame retardant having a low triphenyl phosphate content. Still further, this invention provides a bisphenol-A bis(diphenyl phosphate)-based flame retardant which is a liquid and is resistant to the formation of crystals and which has a high phosphorus content, a low isopropenylphenyl diphenylphosphate content and a low triphenyl phosphate content.
  • the dimer not only attenuates the formation of a solid flame retardant or crystallization in the liquid form, it is also a contributor to the total phosphorus content of the flame retardant. (It is pointed out that the trimer of bisphenol-A bis(diphenyl phosphate) is also an impurity which contributes to the same functions as the dimer. However, the amount of trimer present is usually quite small and thus, focus is kept on the dimer in defining the flame retardants of this invention.) The dimer is easily obtained in situ as it is a product of the process for producing the bisphenol-A bis(diphenyl phosphate) from the reaction of POCl 3 and bisphenol-A followed by the reaction of phenol with the first reaction product. Not any amount of dimer, however, is suitable for these purposes.
  • the amount of dimer needed is tied to the amount of bisphenol-A bis(diphenyl phosphate) in the flame retardant.
  • the amount of bisphenol-A bis(diphenyl phosphate) lies within the range of from 78 to 87 area %, preferably 80 to 85 area %, and most preferably 82 to 85 area %.
  • the amount of dimer needed is that amount which will give a normalized area % for the bisphenol-A bis(diphenyl phosphate) which is within the range of from 83 to less than 90 %, preferably from 85 to 89 %, and most preferably from 85 to 88%.
  • the normalized area % is based on the total of the area %'s for the bisphenol-A bis(diphenyl phosphate) and its dimer. If less dimer than recited above is used, its useful effects are diminished, if more dimer is used, then the character of the flame retardant and its use in a resin formulation is affected. For each bisphenol-A molecule used to produce bisphenol-A bis(diphenyl phosphate), there are two phosphorus substituents, whereas for each molecule of bisphenol-A used to produce the dimer, there are only one and one-half phosphorus substituents. The structural formulas of the two make that clear.
  • the bisphenol-A bis(diphenyl phosphate) molecule which can be referred to as a monomer, has the structure:
  • the dimer has the structure:
  • the amount of dimer in the flame retardants of this invention is within the range of from 10 to 13 area %, preferably from 11 to 13 area %, and most preferably from 12 to 13 area %.
  • the flame retardants of this invention will also have a trimer content, the trimer having the structure:
  • the flame retardants of this invention also feature a very low isopropenylphenyl diphenyl phosphate content. This compound is considered by some in the resin formulation industry as a deleterious impurity whose presence must be minimized.
  • the flame retardants of this invention preferably contain no more than 0.01 area % of this impurity.
  • the structure for this impurity is:
  • a widely recognized and particularly troublesome impurity found in bisphenol-A bis(diphenyl phosphate)-based flame retardants is triphenylphosphate.
  • This impurity tends to "juice" in the resin formulation and adversely affect the formulation's physical characteristics.
  • the flame retardants of this invention are advantaged as they contain less than about 2.5 area % triphenyl- phosphate and preferably less than about 2.0 area %. Most preferred are flame retardants containing less than about 1.5 area % of this impurity.
  • the flame retardants of this invention, after washing and neutralization, will have an acid number less than about 2.0 mg KOH/g and preferably less than about 0.15 mg KOH/g .
  • the melting point range of the flame retardants of this invention is found to be below room temperature, say 20-25°C.
  • the flame retardants of this invention are best described as viscous oils at room temperature.
  • Their viscosity is within the range of from 16,000 to 18,500 cP at 25°C, 2200 to 2400 cP at 40°C and 40-60 cP at 100°C.
  • the flame retardants of this invention are produced in a two step process.
  • the first step entails producing the intermediate, diphosphorotetrachloridate of bisphenol- A, and, to a specified extent, its dimer (and trimer), by gradually adding, over time, bisphenol-A to a reactor containing an excess of phosphorus oxyhalide, the halide being bromine or chlorine, and a catalytic amount of a metal halide, e.g., magnesium chloride.
  • the ratio of POCl 3 to bisphenol-A be within the range of from 3.5:1 to 4.5: 1. These ratios define a large excess of POCl 3 above the stoichiometric amounts. Such excesses serve an additional purpose, that is, the excess POCl 3 acts as a solvent for the process. Thus, no other process solvents, organic or otherwise, are needed.
  • the preferred catalyst is MgCl 2 for use in both process steps.
  • the amount of catalyst used in the first step is generally in an amount of from 0.01 to 4.0 wt% based on the weight of the bisphenol-A fed.
  • the second step if the catalyst is the same as that used in the first step, the original catalyst provided remains in the reaction mass and is sufficient for the second step. If the second step catalyst is different than the first step catalyst, then there is provided about 0.8 wt% catalyst, based on the weight of the bisphenol-A fed to the reaction mass.
  • Other suitable catalyst include, metal halide salts such as aluminum chloride, calcium chloride, zinc chloride and titanium tetrachloride.
  • the bisphenol-A be added to the POCl 3 in increments or on a continuous basis.
  • the monomer/dimer relationship i.e., the normalized area % of the bisphenol-A bis(diphenyl phosphate)
  • the rate of feed of the bisphenol-A to the POCl 3 can be affected by adjusting the rate of feed of the bisphenol-A to the POCl 3 .
  • the trend suggests that high rates of bisphenol-A addition favor the production of the monomer. It is believed that for a particular set of process parameters and for a particular reactor size and configuration, the determination of the best bisphenol-A feed rates is performed by trial and error.
  • the reaction mass temperature during the bisphenol-A addition is kept within the range of from 85 to 106°C to insure that the reaction between the POCl 3 and bisphenol-A proceeds expeditiously. After the bisphenol-A addition is complete, the reaction mass is maintained until the reaction is deemed complete.
  • the bisphenol-A feed and temperature maintenance periods together can range from 3 to 6 hours, and more usually from 4 to 5 hours. If the temperature is too low during the bisphenol-A addition and temperature maintenance periods, say below 70°C, it is believed that the final bisphenol-A bis(diphenyl phosphate)-based product will contain a high amount of isopropenylphenyl diphenylphosphate.
  • the reaction mass is heated under a reduced pressure to distill off the excess POCl 3 . Pressures of about 50 torr can be used. Distillation pot temperatures beginning at 50°C and ending at 150 to 160°C are suitable. Alternatively, the POCl 3 can be removed by stripping the heated reaction mass with an inert gas such as nitrogen. The distillation continues until typically ⁇ 3.5 mole % phosphorus as POCl 3 is detected in the reaction mass by 31 P-NMR.
  • the resultant intermediate product (monomer, dimer and trimer) from the POCl 3 distillation is reacted with phenol in the presence of any one of the previously discussed catalysts.
  • the phenol in the molten state, is fed to the intermediate reaction mass which is at a temperature of from 130 to 160°C.
  • the amount of phenol fed provides from 3.8 to 4, and preferably about 3.9 moles of phenol per mole of bisphenol-A fed in the first step.
  • the reaction mass is kept at a temperature of from 130 to 180°C until no further evolution of HCl is detected. In some cases, it may be advantageous to add a small amount of phenol after the last HCl is detected to insure that the reaction is indeed complete.
  • reaction time (at the above temperatures) for the second step is within 24 hours and preferably occurs in about 6 hours which includes addition times of less than three hours.
  • the reaction mass is dissolved in an organic solvent and washed with caustic, which can be sodium or potassium hydroxide. Multiple water washes are also used. After each washing, there is a phase separation. After the washing, the organic solvent is removed by heating under a reduced pressure.
  • Typical organic solvents are methyl- cyclohexane, toluene, xylene, cyclohexane, heptane, and mixtures of any two or more of the foregoing. Most preferred is a 50 wt% mix of methylcyclohexane and toluene.
  • BPDAP normalized area % was calculated in accordance with, BPDAP area %
  • Step l A 4 necked 2000 ml round-bottom flask was equipped with a mechanical stirrer, a Friedrich condenser stacked on top of an Allihn condenser (tap water used for coolant), and a thermocouple well. The glassware was dried and flushed with nitrogen. A nitrogen blanket was maintained on the contents of the flask by having a nitrogen flow (0.5-1.0 SCFH) T'eed into a line connecting the condenser and a scrubber solution (water or caustic will work) to absorb the HCl that is evolved. The flask containing the scrubber solution was placed on a balance to determine the mass of the HCl evolved.
  • a nitrogen flow 0.5-1.0 SCFH
  • the magnetic stirrer was replaced with a mechanical stirrer and the stack of condensers returned in place of the distillation takeoff/condenser.
  • a 250 ml jacketed addition funnel on an offset adapter was mounted on the 2000 ml flask.
  • a nitrogen blanket was maintained on the contents of the flask by having a nitrogen flow (0.2-1.0 SCFH) T'eed into a line connecting the condenser and a scrubber solution (water or caustic will work) to absorb the HCl that is evolved.
  • the flask containing the scrubber solution was placed on a balance to determine the mass of the HCl evolved.
  • the reaction mixture was stirred while it was warmed to about 145°C and the molten phenol (752 g, 7.99 mol) was added as shown in the table below.
  • reaction mixture (1362 g) was transferred to a jacketed wash kettle (5 liter 4 necked flask with a bottom drain and a mechanical stirrer) with a mixture of 1000 g of toluene and 1004 g of methylcyclohexane.
  • the reaction mixture was washed at 60-72°C with 300 g of 10 wt % aqueous potassium hydroxide (all of the other experiments used 10 wt % aq.
  • sodium hydroxide obtained 434 g of aqueous phase, pH ⁇ 14), 300 g of 5 wt% aqueous potassium hydroxide (obtained 334 g of aqueous phase, pH ⁇ 14), 301 g of tap water (obtained 304 g of aqueous phase, pH ⁇ l 1). 302 g of tap water (obtained 304 g of aqueous phase, pH ⁇ 8). and then 302 g of tap water (obtained 307 g of aqueous phase, pH ⁇ 7). There was obtained 3157 g of organic phase which was gravity filtered (Whatman 2 V paper). The volatiles were removed on a rotavap (2 torr/90°C).
  • the residual solvent was removed in a vacuum oven at 150°C/2 torr to give 1189 g of slight cloudy colorless product as a viscous oil.
  • the product by HPLC analysis contained 0.07 area % DPP, 0.11 area % phenol, 0.49 area % half-ester, 0.002 area % IPP, 84.17 area % BPADP, 12.35 area % dimer, and 1.53 area % trimer. 87.2 normalized area % for the BPADP was caculated.
  • Example II was run in a manner similar to Example I except that it was run in 1/4 scale and used laboratory glassware.
  • Example III was run in the manner of Example I.
  • the process parameters of Examples I and II are recited in Table III.
  • Examples IN-IX were run in the manner of Example I.
  • the process parameters of Examples IV-IX are recited in Table III.
  • Phosphorus oxychloride (POCl 3 , 306.7 g, 2.0 mol) and MgCl 2 (0.95 g, 0.01 mol) were added into a 1 L round-bottomed flask equipped with a Friedrich's condenser (8.5°C). The reaction mass was stirred at 90-95°C under a pad of nitrogen. BPA was added in six increments 114.9 g (total, 0.50 mol) over 1.5 hours. After an additional 3 hours at 105°C, reaction completion was shown by the weight of HCl evolved into a water scrubber (35.8 g HCl trapped, 98% of theoretical). Excess POCl 3 was then removed by distillation from the reaction mass until no POCl 3 was detected using 31 P-NMR. Step 2
  • the reactor was reconfigured with a jacketed addition funnel and nitrogen pad inlet through the addition funnel.
  • the evolved HCl passed through an expansion piece in the reactor neck into an aqueous trap, its weight also used for monitoring the reaction progress.
  • Molten phenol (174.1 g , 1.9 moles at 72°C) was added dropwise over 1.5 hours into the reactor held at 128-134°C and, after addition, reaction proceeded at 148°C for an additional 3 hours, followed by NMR and HPLC analysis of the crude product.
  • the total mass yield of crude product was 322.1 g (92.3% yield, with BPA as limiting reagent).
  • HPLC showed 69.9 % BPADP, 9.07 % oligomerics, 11.0 % unknowns, 2.35 % PhOH, no TPP was detected, and the IPP level was ⁇ 0.01 %.
  • An 88.5 normalized area % for BPADP was calculated.
  • the crude BPADP was purified by dissolving 286.4 g into 483.5 g of mixed solvent (50 % wt methylcyclohexane : toluene), then washing with two 150 g portions 10 % wt. NaOH. There was a phase separation at 70°C after each wash. The organic phase was then washed with three portions of water, which was separated from the aqueous phase after each wash.
  • Solvent removal and drying of the organic phase were accomplished by distillation and nitrogen stripping.
  • the organic phase recovery in the purification step was 91.3 wt %.
  • the residual solvent was removed in a vacuum oven (12 hours, 30 mm Hg; 140°C).
  • the product analysis by HPLC showed 84J area % BPADP, 12.0 area % dimer, 1.46 area % trimer, ⁇ 0.01 area % IPP, 0.11 area % half ester, 0.27 area % DPP.
  • Example X (Of the Invention) The procedure of Example X was followed except that 413.1 g POCl 3 , 176.6 g of bisphenol-
  • HPLC Analysis Method The HPLC method used to obtain the area % values reported herein is described below. The method uses UV detection at 254 nm with and acetonitrile/water gradient on a reverse phase C18 column.
  • the sample is dissolved in acetonitrile at a concentration of approximately 2500 ppm. An aliquot of the solution is then transferred to an autosampler vial. A small portion (10 ⁇ L) is injected into the HPLC and analyzed under gradient conditions at a wavelength of 254 nm. Area % values are calculated for all peaks in the chromatogram.
  • External standard reference materials are available for the following impurities: DPP, Phenol, BPA, and TPP. Solutions of these reference materials are made up at concentrations of 100 ppm. Each is injected and analyzed following the conditions listed below. Response factors are calculated for each of these reference peaks to allow weight % values for these impurities to be calculated from the sample chromatograms.
  • IPP impurity
  • HPLC any suitable HPLC system equipped with a multisolvent delivery system capable of binary gradient elution, UV detection at 254 nm, automatic sample injector capable of 10 ⁇ L sample injection.
  • the HPLC instrument used to obtain the area % values reported was a Hewlett-Packard Model 1090.
  • the flame retardants of this invention can be used in a wide variety of polymer resins. As before noted, they are useful in polycarbonate and acrylonitrile-butadiene-styrene blends (PC/ABS) and in polyphenylene oxide containing blends, especially blends with high impact polystyrene (PPO/HIPS). Other resins in which the flame retardants of this invention are useful are poly- phenylene oxide, high-impact polystyrene, polycarbonate, polyurethane, polyvinyl chloride, acrylonitirle-butadiene-styrene and polybutylene terephthalate.
  • PC/ABS polycarbonate and acrylonitrile-butadiene-styrene blends
  • PPO/HIPS high impact polystyrene
  • Other resins in which the flame retardants of this invention are useful are poly- phenylene oxide, high-impact polystyrene, polycarbonate, polyurethane, poly
  • the flame retardants of this invention will generally be use in amounts ranging from 7 to 20 wt% in the resin, based upon the total weight of the entire resin formulation.
  • the flame retardants of this invention are also suitable for use in combination with other formulation constituents.
  • plasticizers, impact modifiers, antioxidants, UV stabilizers, pigments, fillers may be used.
  • Reference to the prior art will identify further constituents which are suitable additives in for resin formulations.
PCT/US2000/015598 1999-06-11 2000-06-06 Bisphenol-a bis(diphenyl phosphate)-based flame retardant WO2000077012A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00939617A EP1194435A1 (en) 1999-06-11 2000-06-06 Bisphenol-a bis(diphenyl phosphate)-based flame retardant
JP2001503869A JP2003502451A (ja) 1999-06-11 2000-06-06 ビスフェノール−ａビス（ジフェニルホスフェート）をベースとした難燃剤

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US09/330,688 1999-06-11
US09/330,688 US6319432B1 (en) 1999-06-11 1999-06-11 Bisphenol-A bis(diphenyl phosphate)-based flame retardant

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US6319432B1 (en) 2001-11-20
KR20020010927A (ko) 2002-02-06

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