DE2944254A1 - Sterically hindered phenol-contg. phosphite derivs. - for stabilising thermoplastics, esp. aromatic polycarbonate, against heat and hydrolysis (NL 7.5.80) - Google Patents

Abstract

New phenol phosphites have formula A-O-P(OR1)2 (I) (where R1 is 1-30 C alkyl, 6-30 C aryl and/or 3-20 C cycloalkyl and A has formula (II) in which R2, R3 and R4 are H, halogen or 1-4 C alkyl, provided neither R2 nor R4 is H). (I) stabilise thermoplastics, esp. aromatic polycarbonates, polyolefins, PVC and polyesters, against heat and hydrolysis. Aromatic polycarbonate compsn. stabilised with (I) resist yellowing at high moulding temps. 13 cpds. are specifically claimed: (i) diphenyl-(2,4,6-trimethylphenyl)-, (ii) bis(2,4,6-trimethylphenyl)-phenyl-, (iii) tri-(2,4,6-trimethylphenyl)-, (iv) diphenyl-(2,4-tert. butylphenyl)-, (v) bis(2,4-di-tert. butylphenyl)phenyl-, (vi) diphenyl-(2,4-di-tert. butylphenyl)-, (v) bis(2,4-di-tert. butylphenyl)phenyl-, (vi) diphenyl-(2,6-dimethylphenyl)-, (vii) bis(2,6-dimethylphenyl)phenyl-, (vii) di-n-octyl-(2,4,6-trimethylphenyl)-, (ix) di-(2-ethyl-hexyl-(2,4,6-trimethylphenyl)-, (x) di-2-octyl-(2,4,6-trimethylphenyl)-, (xi) 2,4,6-trimethylphenyl-neopentyl-, (xii) 2,4-di-tert. butylphenyl-neopentyl- and (xiii) 2,6-dimethylphenylneopentyl-phosphite.

Description

description

The invention relates to phosphites, particularly hindered ones Phenol phosphites and thermally stable polycarbonate compositions from a mixture of one aromatic polycarbonate and a stabilized amount of such phosphite.

Great efforts have been made in the past in order to produce thermally stable polycarbonate materials that can also be used at elevated temperatures and especially at the mold temperatures generally used for the production of molded Polycarbonate parts are used, are color stable. There are many different phrases have been found that are quite suitable for making the polycarbonates heat and color stable close.

Triorganophosphites such as those disclosed in U.S. Patent are particularly useful 3 305 520 are disclosed. Additionally, U.S. Patents 3,729,440 and 3,953,338 thermally stable aromatic polycarbonates described which a phosphinite and contain an epoxy compound. Finally, U.S. Patent No. 3,794,629 describes chemically stable aromatic polycarbonates containing oxetane phosphites and disclosed in US Pat 3,978,020 discloses thermally stable aromatic polycarbonates which contain epoxy compounds Contains phosphonites.

Polycarbonates have also been used to make bottles, however, these bottles become after sterilization in water or on exposure opaque to moisture at elevated temperatures. U.S. Patent 3,839,247 is described a water-clear polycarbonate compound used for molding bottles can be, this mass being an aromatic or aliphatic epoxy compound contains as a stabilizer.

In the present invention it has been found that when blending an aromatic polycarbonate with a sterically hindered phenol phosphite the resulting mass has improved thermal stability, such as due to its resistance to yellowing when this mass shows up is exposed to high mold temperatures.

The phosphites of the present invention have the following general formula wherein R1 is selected from alkyl having 1-30 carbon atoms, aryl having 6-30 and preferably 6-12 carbon atoms, and cycloalkyl having 3-20 carbon atoms, and A has the following general formula wherein R2, R3 and R4 are selected from hydrogen, halogen and alkyl of 1-4 carbon atoms, provided that neither R2 nor R4 are hydrogen.

R1 in formula I can, for example, be halogen-free or halogen-substituted Be alkyl such as methyl, tertiary butyl and dodecyl; it can also be a cycloalkyl radical be such as cyclohexyl, 2-methyl-cyclohexyl and 14-isopropylcyclohexyl; as well as aryl, such as phenyl, naphthyl and 1,4-diphenylphenyl as well as terphenyl; it can also be aralkyl be, such as benzyl or phenylethyl, and 2-phenylpropyl; Alkaryl, such as p-tolyl, 2,6-xylyl, p-cumyl, m-cumyl and tertiary butylphenyl; and halogen-substituted aryl, such as 2-chlorophenyl, 2,4,6-trichlorophenyl and 2,4,6-tribromophenyl.

The phosphites according to the invention can be produced by known processes as they are z. B. in Organic Phosphorous Compounds, Volume 4, pages 255-462 (1972) by G.M. Kosolapoff and L Maier are described.

The compositions according to the invention contain a mixture of these according to the invention Phosphite with the aromatic polycarbonate, the phosphite compound in a stabilizing amount is present, which is generally in the range of 0.005 - 1.0, preferably from 0.01-0.5 and even more preferably from 0.02-0.2% by weight, based on the weight of the aromatic polycarbonate.

The aromatic polycarbonates which can be used in the composition according to the invention are homopolymers, copolymers and their mixtures that are produced by Reacting a dihydric phenol with a carbonate precursor.

The dihydric phenols which can be used for the production of the polycarbonates are bisphenols, such as bis (4-hydroxyphenyl) methane, 2,2-bis (4-hydroxyphenyl) propane (also Called bisphenol-A), 2,2-bis (14-hydroxy-3-methylphenyl) propane, 4,4-bis (4-hydroxyphenyl) heptane, 2,2-bis (14-hydroxy-3,5-dichlorophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane etc.; dihydric phenol ethers, such as bis (4-hydroxyphenyl) ether, bis (3,5-dichloro-14-hydroxyphenyl) ether etc.; di 4-hydroxyphenyl) ether etc .; Dihydroxphenyls, such as p, p'-dihydroxydiphenyl, 3,3'-dichloro-4,4-dihydroxydiphenyl, etc .; Dihydroxyarylsulfones, such as bis (4-hydroxyphenyl) sulfone, Bis (3,5-dimethyl-4-hydroxyphenyl) sulfone, etc .; Dihydroxybenzenes such as resorcinol and Hydroquinone; Halogen- and alkyl-substituted dihydroxybenzenes, such as 1,4-dihydroxy-2,5-dichlorobenzene, 1,4-dihydroxy-3-methylbenzene, etc. and dihydroxydiphenyl sulfoxides such as bis (4-hydroxyphenyl) sulfoxide, Bis (3,5-dibromo-14-hydroxyphenyl) sulfoxide, etc. It is also a variety of others Dihydric phenols are available to use in the manufacture of carbonate polymers as disclosed in U.S. Patents 2,999,835, 3,028,365 and 3,153,008. For the production of aromatic carbonate polymers, copolymers are also suitable that were obtained from the above dihydric phenols which were copolymerized with halogen-containing dihydric phenols, such as 2,2-bis (3,5-dichloro-11-hydroxyphenyl) propane, 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane etc. It is also possible to have 2 or more various dihydric phenols or a copolymer of a dihydric phenol with a glycol or a hydroxyl or acid terminated polyester or to use with a dibasic acid, in the event that instead of one Carbonate homopolymer, a carbonate copolymer or interpolymer is desired which to be used for the compositions according to the invention, mixtures also being used use any of the above materials.

The carbonate precursor can either be any carbonyl halide Be carbonate ester or a halogen formate. The usable carbonyl halides are carbonyl bromide, carbonyl chloride and their mixtures.

The polymeric derivatives of a dihydric phenol can also be used, a dicarboxylic acid and carbonic acid as disclosed in US Pat. No. 3,169,121.

The aromatic polycarbonates used in the compositions according to the invention are made using a molecular weight regulator, an acid acceptor and a catalyst.

The useful catalyst is any of the suitable catalysts which catalyze the polymerization of bisphenol-A with phosgene.

Branched polycarbonates can also be used in the compositions according to the invention, for their production a polyfunctional aromatic compound with the divalent one Phenol and the carbonate precursor is converted to an arbitrarily branched one to manufacture thermoplastic polycarbonate.

Finally, there are also mixtures of a linear and a branched one Polycarbonate for the compositions according to the invention useful.

The invention is explained in more detail below with the aid of examples. Unless otherwise specified, the parts or percentages are parts by weight or Weight percent.

Example 1 Process for the preparation of the new diphenyl- (2,4,6-irimethylpheny l) phosphites 276 g (2.94 moles) phenol and 200 g (1.47 moles) 2,4,6-trimethylphenol were heated to 50 ° C under nitrogen until melted and then gave 201.9 g (1.47 mol) of phosphorus trichloride are added dropwise. After finishing this Phosphorus trichloride addition, the mixture was heated to 1000C and overnight at kept this temperature. Then a vacuum was applied and unreacted material was distilled Phenol and trimethylphenol. The product, dithenyl- (2,4,6-trimethylphenyl) phosphite, was distilled at 0.1 mm Hg at 165-1700C and gave a clear colorless liquid. Nuclear magnetic resonance (hereinafter abbreviated KM) analysis of protons showed the methyl protons at 2.27 off (9.1 H) and the aromatic and protons at 6.80 7.158 (11.9H).

The compound obtained had the following structure: Example 2 Process for the preparation of the new bis (2,4,6-trimethylphenyl) phenyl phosphite 103.6 g (1.1 moles) phenol and 300 g (2.2 moles) 2,4,6-trimethylphenol were diluted under nitrogen to 50% ° C until melted and then 151.1 g (1.1 mol) of phosphorus trichloride were added dropwise. After the addition of phosphorus trichloride had ended, the mixture was heated to 100 ° C. and kept at this temperature overnight. Then a vacuum was applied and unreacted phenol and trimethylphenol were distilled off. The product, bis (2,4,6-trimethylphenyl) phenyl phosphite, was distilled at 0.35 mm Hg at 187-1900C to give a clear, colorless liquid. The CMR analysis for protons showed the methyl protons at 2.27 d (17.2 H) and the aromatic protons at 6.80 and 7.15, r (9.8 H).

The compound obtained had the following structure Example 3 Method for making the novel tris (2,4,6-trimethylphenyl) phosphite 300 g (2.2 moles) of 2,14,6-trimethylphenol were heated under nitrogen until melted. Then 89.9 g (0.65 mol) of phosphorus trichloride was added dropwise. After this addition was complete, the mixture was heated to 100 ° C. and kept at this temperature overnight. A vacuum was applied and unreacted trimethylphenol was distilled off. The product, tris (2,4,6-trimethylphenyl) phosphite, was distilled at 0.3 mm Hg at 172-1740C and a clear, colorless liquid was obtained which solidified on standing and had a melting point of 92-950C. The CMR analysis for protons showed the methyl protons at 2.23 (27 H) and the aromatic protons at 6.77 es (6 H). The obtained compound had the following structure Example 4 Method for preparing the novel diphenyl- (2,4-di-t-butylphenyl) phosphite 564.7 g (6 moles) of phenol and 619 g (3 moles) of 2,4-di-t-butylphenol were added under nitrogen Heated at 500C until melted and then added 412.1 g (3 moles) of phosphorus trichloride dropwise. After the addition was complete, the mixture was heated to 100 ° C. and kept at this temperature overnight. Then a vacuum was applied and unreacted phenol and di-t-butylphenol were distilled off. The product, diphenyl- (2,4-di-t-butylphenyl) phosphite, was distilled at 0.15 mm Hg at 175-1800 ° C. and a pale yellow liquid was obtained. CMR analysis for protons showed the t-butyl protons at 1.3 & (19.8 H) and the aromatic protons at 7.1J '(10.2 H).

The compound obtained had the following structure Example 5 Process for preparing the novel bis (2,4-di-t-butylphenyl) phenyl phosphite, 70.5 g (0.75 moles) of phenol and 309.5 g (1.5 moles) of 2,4-di-t-butylphenol heated to 50 ° C. under nitrogen until they had melted and then 96.2 g (0.7 mol) of phosphorus trichloride were added dropwise. After the addition was complete, the mixture was heated to 100 ° C. and kept at this temperature overnight. Then vacuum was applied and unreacted phenol and di-t-butylphenol were distilled off. The product, bis (2,4-di-t-butylphenyl) phenyl phosphite, was distilled at 0.2 mm Hg at 1800 ° C. and a pale yellow liquid was obtained. The CMR analysis for protons showed the t-butyl protons at 1.3 g (33.4 H) and the aromatic protons at 7.2 '(13.6 H).

The compound obtained had the following structure Example 6 Process for the preparation of the new diphenyl- (2,6-dimethylphenyl) phosphite 769.8 g (8.18 moles) phenol and 500 g (4.09 moles) 2,6-dimethylphenol were heated to 50 ° C. under nitrogen they melted and then 561.7 g (4.09 moles) of phosphorus trichloride was added dropwise. After the addition was complete, the mixture was heated to 100 ° C. and kept at this temperature overnight. Then a vacuum was applied and unreacted phenol and dimethylphenol were distilled off. The above product was distilled at 0.2 mm Hg at 15500 and a clear, colorless liquid was obtained. The CMR analysis for protons showed the methyl protons at 2.33 # (5.6 H) and the aromatic protons at 7.0 and 7.17 & (13.4 H).

The compound obtained had the following structure Example 7 Method for preparing the novel bis (2,6-dimethylphenyl) phenylphosphite 280 g (2.04 moles) of phenol and 500 g (4.09 moles) of 2,6-dimethylphenol were heated to 50 ° C. under nitrogen until they were melted and then 192 g (2.04 moles) of phosphorus trichloride was added dropwise. After the addition was complete, the mixture was heated to 100 ° C. and kept at this temperature overnight.

Then a vacuum was applied and unreacted phenol was distilled and Dimethylphenol. The above product was distilled at 0.2 mm Hg and 155-1650C and gave a clear, colorless liquid. The CMR analysis on protons showed the Methyl protons at 2.33; (11.4 H) and the aromatic protons at 7.00 and 7.17 6 (11.6 H).

The compound obtained had the following structure Example 8 Method of making the new di-n-octyl- (2,4,6-trimethylphenyl) phosphite 50 g (0.14 moles) diphenyl- (2,4,6-trimethylphenyl) phosphite, 40 g (0.31 Mol) 1-octanol and 0.25 g sodium methoxide were heated under a vacuum of 30 mm Hg. The phenol was removed by a Vigreau: x column at a pot temperature of 1300C and a head temperature of 93 ° C at 30 mm Hg. The pot temperature was increased to 160 ° C and the pressure decreased to 0.2 mm Hg to ensure complete removal of the phenol and excess octanol. The above product was distilled at 0.2 mm Hg at 138-139 ° C. and a clear, colorless liquid was obtained. The CMR analysis for protons showed the aliphatic protons centered at 0.85 and 1.3dz, the methyl protons of the trimethylphenyl group at 2.3 (1, the methylene groups adjacent to the oxygen at 3.95 d and the aromatic protons at 7.0 li Die obtained compound had the following structure Example 9 Process for the preparation of the new di (2-ethyl-1-hexyl) - (2,14,6-trimethylphenyl) phosphite 50 g (0.14 moles) of diphenyl- (2,14,6-trimethylphenyl) phosphite, 40 g (0.31 mol) of 2-ethyl-1-hexanol and 0.25 g of sodium methoxide were heated under a vacuum of 30 mm Hg. The phenol was removed from the reaction mixture by a Vigreaux column with a head temperature of 940 ° C. and 30 mm Hg. The vessel temperature was increased to 160 ° C. and the pressure reduced to 0.2 mm Hg to ensure complete removal of phenol and excess hexanol. The above product was distilled at 0.2 mm Hg and 150-155 ° C. in order to obtain a clear, colorless liquid. The CMR analysis for protons showed the aliphatic protons centered at 0.9 and 1.3 S, the methyl groups of the trimethylphenyl group at 2.3 #, the methylene group adjacent to oxygen at 3.95 f and the aromatic protons at 7, 0, t.

The compound obtained had the following structure Example 10 Method for preparing the new di-2-octyl- (2,4,6-trimethylphenyl) phosphite 50 g (0.14 moles) of diphenyl (2,14,6-trimethylphenyl) phosphite, 40 g (0.31 Mole) 2-octanol and 0.25 g sodium methoxide were heated to 10,000 under a vacuum of 30 mm Hg. The phenol was removed from the reaction mixture by a Vigreaux column with a head temperature of 94 ° C. and 30 mm Hg. The vessel temperature was increased to 160 ° C. and the pressure reduced to 0.2 mm Hg to ensure complete removal of phenol and excess octanol. The above product was distilled at 0.2 mm Hg and 168 ° C to obtain a clear, colorless liquid. The CMR analysis for protons showed the aliphatic protons centered at 0.85 and 1.3 dz, the methyl groups of the trimethylphenyl group at 2.258, the methine groups adjacent to oxygen at 4.4, and the aromatic protons at 6.8 in. The compound obtained had the following structure Example 11 Method for preparing the new 2, 14,6-trimethylphenylneopentyl phosphite 144.8 g (0.41 mole) diphenyl- (2,4,6-trimethylphenyl) phosphite, 42.7 g (0.41 mole) dimethylpropanediol and 0 , 5 g of sodium methoxide was heated under a vacuum of 30 mm Hg. The phenol was removed from the reaction mixture through a Vigreaux column at a head temperature of 940C under a pressure of 30 mm Hg.

The temperature of the vessel was increased to 1600C for 3 hours to reach the perfect level Ensure removal of the phenol. The above product was distilled at 0.35 mm Hg at 127-1300C to give a clear colorless liquid to surrender.

The CMR analysis for protons showed the aliphatic protons at 0.6 and 1.2 Cr, the methyl groups of the trimethylphenyl group at 2.2 {, the methylene groups adjacent to the oxygen at 3.4 and 4.3 d and the aromatic protons at 6, 8 f The compound obtained had the following structure Example 12 Process for the preparation of the novel 2, 14-di-t -butylphenyl-neopentyl phosphite 150 g (0.36 mol) diphenyl- (2,14-di-t-butylphenyl) phosphite, 37 g (0.36 mol) Dimethylpropanediol and 0.5 g sodium methoxide were heated under a vacuum of 30 mm Hg. Phenol was removed from the reaction mixture through a Vigreaux column with a head temperature of 940C at 30 mm Hg. The vessel temperature was increased to 160 ° C. for 3 hours to ensure complete removal of the phenol. The above product was distilled at 0.1 mm Hg at 1100C to give a clear colorless liquid that solidified to a white solid on standing (F 68-730C). The CMR analysis for protons showed the aliphatic protons from 0.6 - 1.5 d, the methylene groups adjacent to the oxygen at 3.5 and 4.36 and the aromatic protons centered at 7.2 6.

The compound obtained had the following structure Example 13 Method for preparing the novel 2,6-dimethylphenylneopentyl phosphite 270 g (0.8 mol) of diphenyl (2,6-dimethylphenyl) phosphite, 104.2 g (1.0 mol) of dimethylpropanediol and 0.5 g of sodium methoxide were used heated to a vacuum of 30 mm Hg. The phenol was removed from the reaction mixture through a Vigreaux column with a head temperature of gOC at 30 mm Hg. The vessel temperature was raised to 160 ° C. for 3 hours to ensure complete removal of the phenol. The above product was distilled at 0.4 mm Hg at 95-115 ° C to give a clear colorless liquid. The CMR analysis for protons showed the aliphatic protons of 0.8-1.4 dL, the methyl groups of the dimethylphenyl group at 2.3 &, the methylene groups adjacent to the oxygen at 3.4 and 4.3 & and the aromatic protons at 7 , 2 &.

The compound obtained had the following structure Example 14 A polycarbonate homopolymer was prepared by reacting essentially equimolar amounts of 2,2-bis (hydroxyphenyl) propane (bisphenol-A) and phosgene in an organic medium with triethylamine, sodium hydroxide and phenol under the usual conditions. Samples of the polycarbonate homopolymer obtained were mixed with the stabilizers listed in Table I below and a trace of a commercially available blue pigment by mixing the ingredients in a laboratory tilting drum. This mixture was fed to an extruder which was operated at about 260 ° C. The extruded strands were cut into pellets. The pellets were then injection molded at 315 and

360 C processed into test pieces, the dimensions of 7.5 cm x 5 cm x 0.3 cm thick. The thermal stability of the test pieces to discoloration was determined on the samples according to the ASTM yellow index (abbreviated to YI), test D1925, which had been obtained in the aforementioned 315 and 3600C. The results are summarized in Table I below.

Table I Thermal stability stabilizer amount YI of the test pieces molded at wt% wt% 3150C 3600C + A 0.1 3.1 10.1 Example 1 0.04 2.6 5.5 Example 1 0.08 2.6 5.7 Example 2 0.04 2.8 6.1 Example 2 0.08 2.4 5.9 Example 3 0.05 2.9 5.7 Example 3 0.10 2.8 6.0 1 part octyl diphenyl phosphite 2 parts 3,4-epoxy-cyclohexylmethyl-3,4-epoxycyclohexane carboxylate according to DE-PS 1 694 285.

The test pieces molded at 3600C underwent accelerated heat aging subjected by placing them in an oven at 1400C for one or two weeks. The results are summarized in Table II below.

Stabilizer amount YI of the test pieces molded at 3600C wt .- t wt .-% after heat aging without heat - 1 week heat - 2 weeks heat aging aging aging A 0.1 10.1 20.7 28.2 Example 1 0.04 5.5 14.3 22.3 Example 1 0.08 5.7 14.0 23.8 Example 2 0.04 6.1 15.6 23.2 Example 2 0.08 5.9 14.6 23.6 Example 3 0.05 5.7 15.8 23.9 Example 3 0.1 6.0 14.7 24.4 The results of the tables I and II show that the stabilizers of Examples 1, 2 and 3 are significantly better imparted thermal stability even when in markedly lower concentrations were used as the stabilizer A according to the prior art.

Example 15 As described in Example 14, a polycarbonate homopolymer was produced prepared, mixed with the stabilizers, extruded and molded into test pieces and the YI of the test pieces as described in Example 14 are determined. The results are summarized in Table III below.

Table III Thermal Stability Amount YI of the test pieces molded for stabilizer (% by weight) 3150G 360 C A 0.1 2.0 6.4 Example 4 0.04 2.1 3.7 Example 4 0.08 1.6 14> 7 From the results in Table III above it can be seen that the stabilizer of Example 4 is comparable even in lower concentrations or improved thermal stability compared to stabilizer A according to the state bestowed on technology. And this especially with those at the higher temperature of 3600C obtained test pieces.

Example 16 A polycarbonate homopolymer was prepared as described in Example 1 manufactured and mixed with stabilizers, extruded and processed into test pieces. The YI of the test pieces was determined as described in Example 14 and the results are summarized in Table IV below, the control sample being a polycarbonate composition is without a stabilizer.

Table IV Thermal Stability Amount YI of test pieces molded in the case of stabilizer in weight; 315 C 360 c Control - 3.3 8.1 A 0.1 2.0 5.7 Example 8 0.04 2.0 4.9 Example 8 0.08 1.8 4.4 Example 9 0.04 1.9 4.7 Example 9 0.08 1.8 4.8 Example 10 0.04 2.3 4.4 Example 10 0.08 2.0 4.1 The results of the above Table IV shows that the stabilizers of Examples 8, 9 and 10, although they were used in lower concentrations, a thermal stability that for the test pieces molded at 31500 were comparable to the effect of the Stabilizer A was prior art and those molded at 3600C Test pieces was considerably better than the prior art Stabilizer A Technology.

Example 17 As described in Example 14, a polycarbonate homopolymer was made manufactured, mixed with stabilizers, extruded and processed into like test pieces. The YI of the test pieces was described in Example 14, determined and the results are summarized in the following Table V, in the control a polycarbonate composition is designated without a stabilizer.

Table V Thermal Stability Amount YI of the test pieces molded at Stabilizer in% by weight 315 ° C 3600c control - 3.5 6.3 A 0.1 2.1 6.9 B 0.025 2.2 4.0 B 0.05 1.8 4.1 Example 11 0.03 1.9 3.7 Example 11 0.06 1.7 2.9 Example 12 0> 035 1.7 3.4 Example 12 0.07 1.6 3.5 Phenylneopentyl phosphite according to U.S. Patent 3,509,091.

As can be seen from the results in Table V, lend the stabilizers of Examples 11 and 12 have a markedly better thermal stability than the stabilizers A and B according to the prior art at about comparable Concentrations, especially in the test pieces, at the higher mold temperature from 3600C.

Example 18 The molded test pieces of Example 17 were also used subjected to steam treatment in an autoclave at 1200C in order to produce the Light transmittance before and after this treatment according to ASTM D1003 their hydrolytic To determine stability. The results are summarized in the present Table VI.

Table VI Hydrolytic Stability Percent Light Permeability Stabilizer in (wt .-%) Example 11 Example 12 Time (h) B (0.025) (0.03) (0.035) 0 87.6 87.7 87.6 24 147.7 80.8 87.1 48 3.2 15.3 814> 1 72 - - 63.2 The results Table VI show that the hydrolytic stability of the polycarbonate compositions with the stabilizers of Examples 11 and 12 is considerably better than that with the stabilizer B according to the prior art, in which the corresponding mass is already failed before the end of the 24 hour treatment. The failure is general assumed when the light transmittance falls below 75%.

Example 19 Following the procedure of Example 14, a polycarbonate homopolymer was obtained manufactured, mixed with stabilizers, extruded and molded into test pieces. The YI of the test pieces was determined as described in Example 14 and the results are summarized in Table VII below.

Table VII Thermal stability amount YI of test pieces molded with stabilizer (in% by weight) 315 drew 360 c A 0.1 2.2 7> 3 Example 13 0.03 1.8 3.8 Example 13 0.06 1.5 3 ,? The results in the table above VII it can be seen that the stabilizer of Example 13 of the polycarbonate composition gives considerably better thermal stability than stabilizer A according to the state of the art and this even at very much lower concentrations.

Claims (20)

Phosphites and heat-stable polycarbonate mass containing such a phosphite. Patent claims 1. Phosphite, characterized by the X general formula wherein R1 is an alkyl group having 1 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms and / or a cycloalkyl group having 3 to 20 carbon atoms, and A has the following general formula wherein R2, R3 and Rq are selected from hydrogen, halogen and alkyl radicals having 1-4 carbon atoms, provided that neither R2 nor R are hydrogen. 2. Phosphite of the following formula 3. Phosphite of the following formula 4. Phosphite of the following formula 5. Phosphite of the following formula 6. Phosphite of the following formula 7. Phosphite of the following formula 8. Phosphite of the following formula 9. Phosphite of the following formula 10. Phosphite of the following formula 11. Phosphite of the following formula 12. Phosphite of the following formula 13. Phosphite of the following formula 14. Phosphite of the following formula 15. Thermally and hydrolytically stabilized thermoplastic mass, g e k e n n shows a mixture of a thermoplastic resin and a thermoplastic resin A stabilizing amount of a phosphite according to any one of claims 1-14. 16. Composition according to claim 15, d a d u r c h g e k e n n -z e i c h n e t that the stabilizer in an amount of 0.005-1.0 wt .-%, based on the Weight of the thermoplastic resin is present. 17. Composition according to claim 16, d a d u r c h g e k e n n -z e i c h n e t that the stabilizer is present in an amount of 0.01-0.5% by weight. 18. Composition according to any one of claims 15-17, d a d u r c h g It should be noted that the thermoplastic resin is selected from aromatic Polycarbonates, polyolefins, polyvinyl chloride and polyesters. 19. Composition according to claim 18, d a d u r c h g e k e n n -z e i c h n e t that the thermoplastic resin is an aromatic polycarbonate having a high Molecular weight is. 20. Composition according to any one of claims 15-19, d a -d u r c h it is not noted that they further contain a stabilizing amount of an epoxy contains as a costabilizer.