Classifications

• • 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 Table
  • C07F9/02—Phosphorus compounds
  • C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
  • C07F9/6564—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms
  • C07F9/6571—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms
  • C07F9/6574—Esters of oxyacids of phosphorus
  • C07F9/65746—Esters of oxyacids of phosphorus the molecule containing more than one cyclic phosphorus atom
• • 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
  • C08K5/527—Cyclic esters

Definitions

• This invention pertains to a novel crystalline modification of 2,2',2"-nitrilo[triethyl-tris- (3,3 ⁇ 5,5'-tetra-tert-butyl-l,r-biphenyl-2,2'-diyl) phosphite], to a process for preparing said modification and the use thereof for stabilizing organic materials against oxidative, thermal or light-induced degradation.
• 2,2 ⁇ 2"-NitrUo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-l,l'-biphenyl-2,2'-diyl) phosphite] is a compound having the formula I
• This compound of formula I is useful as a processing stabilizer for organic materials as taught in US-A-4318845 and US-A-4374219.
• the compound of formula I is disclosed as being a white powder melting at 121-134°C.
• the powdery product has defects in terms of handling and apparent density, exhibiting poor flowability, meterability, sto ⁇ rage stability and hydrolytic stability.
• the compound of formula I can be obtained in a different crystalline modification as purified crystalline particles which exhibit acceptable proper ⁇ ties in respect to handling, apparent density, flowability, meterability, storage stability and hydrolytic stability.
• the new modification is characterized by a monoclinic crystalline form, melting in the range of 145-165°C as given by the peak temperature of the endotherm recorded by diffe ⁇ rential scanning calorimetry (DSC); and by an X-ray diffraction pattern obtained using Cu-K ⁇ which exhibits diffraction angles (2 ⁇ ) of relative intensity given in the Table 1 be ⁇ low.
• the X-ray diffraction pattern thus shows angles (2 ⁇ ) lines of very high intensity at 5.2; lines of high intensity at 10.7, 16.6 and 17.4; lines of medium intensity at 5.8, 8.0, 8.9, 10.0, 10.1, 10.7, 15.7, 16.2 and 18.2; lines of weak intensity at 6.3, 6.5, 7.2, 11.6, 12.7, 13.6, 14.2, 14.9, 17.0, 18.7 and 19.6; and a relative absolute configuration of the three stereo axes of the dibenzo[d,f][l,3,2]dioxaphosphepin rings of R*,R*,R*.
• R* follows the customary convention when the absolute configuration of a molecule is un ⁇ known.
• the nomenclature adopted here is based on recent Chemical Abstracts Service practice as described by L. C. Cross and W. Kylne, Pure Appl. Chem. 45, 11-30 (1976).
• the instant invention also relates to a process for the preparation of this novel alpha crystalline form of the compound of formula I, which comprises crystallizing or recrystal ⁇ lizing said compound from a mixture of an aromatic hydrocarbon solvent and an alkanol of 1 to 3 carbon atoms; from an ether solvent; from an ester solvent; or from a mixture of a halogenated aliphatic hydrocarbon solvent and an alkanol of 1 to 3 carbon atoms.
• aromatic hydrocarbon solvents useful in the instant process are benzene, tolu ⁇ ene, o-xylene, m-xylene, p-xylene, 1,2,3-trimethylbenzene, 1,3,5-t ⁇ imethylbenzene, 1,2,4- trimethylbenzene, 1,2,4,5-tetramethylbenzene, ethylbenzene, cumene, o-cymene, m-cy- mene, p-cymene, o-diisopropylbenzene, m-diisopropylbenzene, p-diisopropylbenzene, and mixtures of such aromatic hydrocarbon solvents.
• lower carbon chain alkanols of 1 to 3 carbon atoms are methanol, ethanol, 1-propanol, isopropanol and mixtures of such lower alkanols.
• ester solvents are methyl formate, ethyl formate, methyl acetate, ethyl ace ⁇ tate, n-butyl acetate, isobutyl acetate, amyl acetate and the like.
• ether solvents are diethyl ether, d ⁇ sopropyl ether, methyl tert-butyl ether and the like.
• halogenated aliphatic hydrocarbon solvents are methylene chloride, chloro ⁇ form, 1,2-dichloroethane, 1,1,2,2-tetrachloroethane and the like.
• the preferred process for preparing the novel alpha crystalline modification is by crystalli ⁇ zing or recrystallizing the compound of formula I from a mixture of an aromatic hydrocar ⁇ bon solvent and an alkanol of 1 to 3 carbon atoms.
• the preferred process for preparing the novel alpha crystalline modification is also by cry ⁇ stallizing or recrystallizing the compound of formula I from a mixture of benzene, toluene, o-xylene, m-xylene, p-xylene, 1,2,3-trimethylbenzene, 1,3,5-trimethylbenzene, 1,2,4-tri- methylbenzene, 1,2,4,5-tetramethylbenzene, ethylbenzene, cumene, o-cymene, m-cymene, p-cymene, o-diisopropylbenzene or m-diisopropylbenzene and an alkanol of 1 to 3 carbon atoms; from methyl formate, ethyl formate, methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate or amyl acetate; from diethyl ether,
• An especially preferred process for preparing the novel alpha crystalline modification is by crystallizing or recrystallizing the compound of formula I from a mixture of benzene, toluene, o-xylene, m-xylene, p-xylene, 1,2,3-trimethylbenzene, 1,3,5-trimethylbenzene, 1,2,4-trimethylbenzene, 1,2,4,5-tetramethylbenzene, ethylbenzene, cumene, o-cymene, m-cymene, p-cymene, o-diisopropylbenzene, or m-diisopropylbenzene and an alkanol of 1 to 3 carbon atoms.
• a preferred embodiment of the instant process involves isolating the crystalline mass from any of the above processes and drying it under vacuum at elevated temperature.
• the instant invention relates also to the alpha, monoclinic crystalline form of 2,2',2"-nitri- lo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-l,r-biphenyl-2,2'-diyl) phosphite], characterized by melting in the range of 145-165°C and by an X-ray diffraction pattern exhibiting lines of very high intensity at 5.2; lines of high intensity at 10.7, 16.6 and 17.4; lines of medium intensity at 5.8, 8.0, 8.9, 10.0, 10.1, 10.7, 15.7, 16.2 and 18.2; lines of weak intensity at 6.3, 6.5, 7.2, 11.6, 12.7, 13.6, 14.2, 14.9, 17.0, 18.7 and 19.6; and a relative configuration of the three dibenzo[d v f][1.3.2]dioxaphosphepin rings of R*, R*, R*, obtainable by cry ⁇ stallizing
• the alpha, monoclinic crystalline form of formula I according to the invention is highly suitable for stabilizing organic materials against oxidative, thermal or light-induced degra- dation.
• Polymers of monoolefins and diolefins for example polypropylene, polyisobutylene, polybut-1-ene, poly-4-methylpent-l-ene, polyisoprene or polybutadiene, as well as poly ⁇ mers of cycloolefins, for instance of cyclopentene or norbornene, polyethylene (which optionally can be crosslinked), for example high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), branched low density polyethylene (BLDPE).
• HDPE high density polyethylene
• LDPE low density polyethylene
• LLDPE linear low density polyethylene
• BLDPE branched low density polyethylene
• Polyolefins i.e. the polymers of monoolefins exemplified in the preceding paragraph, preferably polyethylene and polypropylene, can be prepared by different, and especially by the following, methods:
• a catalyst that normally contains one or more than one metal of groups IVb, Vb, VIb or Vm of the Periodic Table.
• These metals usually have one or more than one ligand, typically oxides, halides, alcoholates, esters, ethers, amines, alkyls, alkenyls and/or aryls that may be either ⁇ - or ⁇ -coordinated.
• These metal complexes may be in the free form or fixed on substrates, typically on activated magnesium chloride, titanium(ni) chloride, alumina or silicon oxide.
• These catalysts may be soluble or insoluble in the polymerisation medium.
• the catalysts can be used by themselves in the polymerisation or further activators may be used, typically metal alkyls, metal hydrides, metal alkyl halides, metal alkyl oxides or metal alkyloxanes, said metals being elements of groups la, Ha and/or ma of the Periodic Table.
• the activators may be modified conveniently with further ester, ether, amine or silyl ether groups.
• These catalyst systems are usually termed Phillips, Standard Oil Indiana, Ziegler (-Natta), TNZ (DuPont), metallocene or single site catalysts (SSC).
• Copolymers of monoolefins and diolefins with each other or with other vinyl mono ⁇ mers for example ethylene/propylene copolymers, linear low density polyethylene (LLDPE) and mixtures thereof with low density polyethylene (LDPE), propylene/but- 1-ene copolymers, propylene/isobutylene copolymers, ethylene/but-1-ene copolymers, ethylene hexene copolymers, ethylene/methylpentene copolymers, ethylene/heptene copolymers, ethylene/octene copolymers, propylene/butadiene copolymers, isobutylene/- isoprene copolymers, ethylene/alkyl acrylate copolymers, ethylene/alkyl methacrylate copolymers, ethylene/vinyl acetate copolymers and their copolymers with carbon mon ⁇ oxide or ethylene/acrylic acid copolymers and their salts (
• Hydrocarbon resins for example C 5 -C 9
• hydrogenated modifications thereof e.g. tackifiers
• mixtures of polyalkylenes and starch
• Polystyrene poly(p-methylstyrene), poly( ⁇ -methylstyrene).
• Copolymers of styrene or ⁇ -methylstyrene with dienes or acrylic derivatives for example styrene/butadiene, styrene/acrylonitrile, styrene/alkyl methacrylate, styrene/buta- diene alkyl acrylate, styrene/butadiene/alkyl methacrylate, styrene/maleic anhydride, styrene/acrylonitrile/methyl acrylate; mixtures of high impact strength of styrene copoly ⁇ mers and another polymer, for example a polyacrylate, a diene polymer or an ethylene/- propylene/diene terpolymer, and block copolymers of styrene such as styrene/butadiene/- styrene, styrene/isoprene/styrene, sty
• Graft copolymers of styrene or ⁇ -methylstyrene for example styrene on polybutadiene, styrene on polybutadiene-styrene or polybutadiene-acrylonitrile copolymers; styrene and acrylonitrile (or methacrylonitrile) on polybutadiene; styrene, acrylonitrile and methyl methacrylate on polybutadiene; styrene and maleic anhydride on polybutadiene; styrene, acrylonitrile and maleic anhydride or maleimide on polybutadiene; styrene and maleimide on polybutadiene; styrene and alkyl acrylates or methacrylates on polybutadiene; styrene and acrylonitrile on ethylene/propylene/diene terpolymers; styrene and acrylon
• Halogen-containing polymers such as polychloroprene, chlorinated rubbers, chlorinated or sulfochlorinated polyethylene, copolymers of ethylene and chlorinated ethylene, epi- chlorohydrin homo- and copolymers, especially polymers of halogen-containing vinyl compounds, for example polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, polyvinylidene fluoride, as well as copolymers thereof such as vinyl chloride/vinylidene chloride, vinyl chloride/vinyl acetate or vinylidene chloride/vinyl acetate copolymers.
• halogen-containing vinyl compounds for example polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, polyvinylidene fluoride, as well as copolymers thereof such as vinyl chloride/vinylidene chloride, vinyl chloride/vinyl acetate or vinylidene chloride/vinyl a
• Polymers derived from ⁇ , ⁇ -unsaturated acids and derivatives thereof such as polyacry- lates and polymethacrylates; polymethyl methacrylates, polyacrylamides and polyacrylo- nitriles, impact-modified with butyl acrylate.
• Copolymers of the monomers mentioned under 9) with each other or with othei unsaturated monomers for example acrylonitrile/ butadiene copolymers, acrylonitrile/- alkyl acrylate copolymers, acrylonitrile/alkoxyalkyl acrylate or acrylonitrile/vinyl halide copolymers or acrylonitrile/ alkyl methacrylate/butadiene terpolymers.
• Polymers derived from unsaturated alcohols and amines or the acyl derivatives or acetals thereof for example polyvinyl alcohol, polyvinyl acetate, polyvinyl stearate, poly ⁇ vinyl benzoate, polyvinyl maleate, polyvinyl butyral, polyallyl phthalate or polyallyl melamine; as well as their copolymers with olefins mentioned in 1) above.
• cyclic ethers such as polyalkylene glycols, poly ⁇ ethylene oxide, polypropylene oxide or copolymers thereof with bisglycidyl ethers.
• Polyacetals such as polyoxymethylene and those polyoxymethylenes which contain ethylene oxide as a comonomer; polyacetals modified with thermoplastic polyurethanes, acrylates or MBS.
• Polyamides and copolyamides derived from diamines and dicarboxylic acids and/or from aminocarboxylic acids or the corresponding lactams for example polyamide 4, poly ⁇ amide 6, polyamide 6/6, 6/10, 6/9, 6/12, 4/ ⁇ , 12/12, polyamide 11, polyamide 12, aromatic polyamides starting from m-xylene diamine and adipic acid; polyamides prepared from hexamethylenediamine and isophthalic or/and terephthalic acid and with or without an elastomer as modifier, for example poly-2,4,4,-trimethylhexamethylene terephthalamide or poly-m-phenylene isophthalamide; and also block copolymers of the aforementioned polyamides with polyolefins, olefin copolymers, ionomers or chemically bonded or graf ⁇ ted elastomers; or with polyethers, e.g. with polyethylene glycol, polypropylene glycol or polyte
• Polyesters derived from dicarboxylic acids and diols and or from hydroxycarboxylic acids or the corresponding lactones for example polyethylene terephthalate, polybutylene terephthalate, poly-l,4-dimethylolcyclohexane terephthalate and polyhydroxybenzoates, as well as block copolyether esters derived from hydroxyl-terminated polyethers; and also polyesters modified with polycarbonates or MBS.
• Crosslinkable acrylic resins derived from substituted acrylates for example epoxy acrylates, urethane acrylates or polyester acrylates.
• Crosslinked epoxy resins derived from polyepoxides, for example from bisglycidyl ethers or from cycloaliphatic diepoxides.
• Natural polymers such as cellulose, rubber, gelatin and chemically modified homolo ⁇ gous derivatives thereof, for example cellulose acetates, cellulose propionates and cellu ⁇ lose butyrates, or the cellulose ethers such as methyl cellulose; as well as rosins and their derivatives.
• Blends of the aforementioned polymers for example PP/EPDM, Poly- amide/EPDM or ABS, PVC EVA, PVC/ABS, PVC/MBS, PC/ABS, PBTP/ABS, PC ASA, PC PBT, PVC CPE, PVC/acrylates, POM thermoplastic PUR, PC thermoplastic PUR, POM/acrylate, POM/MBS, PPO/HIP S, PPO PA 6.6 and copolymers, PA HDPE, PA/PP, PA/PPO.
• polyblends for example PP/EPDM, Poly- amide/EPDM or ABS, PVC EVA, PVC/ABS, PVC/MBS, PC/ABS, PBTP/ABS, PC ASA, PC PBT, PVC CPE, PVC/acrylates, POM thermoplastic PUR, PC thermoplastic PUR, POM/acrylate, POM/MBS, PPO/HIP S, PPO PA 6.6 and copolymers, PA HDPE, PA/PP,
• Naturally occurring and synthetic organic materials which are pure monomeric com ⁇ pounds or mixtures of such compounds, for example mineral oils, animal and vegetable fats, oil and waxes, or oils, fats and waxes based on synthetic esters (e.g. phthalates, adi- pates, phosphates or trimellitates) and also mixtures of synthetic esters with mineral oils in any weight ratios, typically those used as spinning compositions, as well as aqueous emul ⁇ sions of such materials.
• synthetic esters e.g. phthalates, adi- pates, phosphates or trimellitates
• synthetic esters e.g. phthalates, adi- pates, phosphates or trimellitates
• synthetic esters e.g. phthalates, adi- pates, phosphates or trimellitates
• synthetic esters e.g. phthalates, adi- pates, phosphates or trimellitates
• Aqueous emulsions of natural or synthetic rubber e.g. natural latex or latices of carboxylated styrene/butadiene copolymers.
• compositions comprising (a) an organic material subjected to oxidative, thermal or light-induced degradation and (b) the alpha, monoclinic crystalline form of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-l,r-biphenyl- 2,2'-diyl) phosphite].
• the organic materials to be protected are natural, semi-synthetic or, preferably, synthetic organic materials.
• thermoplastic polymers in particular PVC or polyolefins, especially polyethylene and polypropylene.
• the compounds according to the invention against thermal and oxidative de ⁇ gradation, especially under thermal stress, ⁇ uch as occurs during processing of thermoplas ⁇ tics, may be mentioned in particular. Accordingly, the compounds according to the inven ⁇ tion are highly suitable for use as processing stabilizers.
• the alpha, monoclinic crystalline form of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'- tetra-tert-butyl-l, -biphenyl-2,2'-diyl) phosphite] according to the invention is added to the material to be stabilized in amounts of 0.01 to 10%, for example 0.01 to 5%, prefe ⁇ rably 0.05 to 3%, in particular 0.05 to 1%, relative to the weight of the organic material to be stabilized.
• compositions according to the invention can contain, in addition to the alpha, mono ⁇ clinic crystalline form of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-te ⁇ -butyl-l,l'- biphenyl-2,2'-diyl) phosphite], further co-stabilizers, for example the following:
• Al ylated monophenols for example 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl- 4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2-( ⁇ -methylcyclo- hexyl)-4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol, 2,6-di-nonyl-4-methylphenol, 2,4-dimethyl-6- ( 1 '-methylundec- 1 '-yl)phenol, 2,4-dimethyl-6-( 1 -methylhept
• Alkylthiomethylphenols for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-di-do- decylthiomethyl-4-nonylphenol.
• Alkylthiomethylphenols for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-di-do- decylthiomethyl-4-nonylphenol.
• Hydroquinones and all viated hvdroquinones for example 2,6-di-tert-butyl-4- methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-di- phenyl-4-octadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4-hydroxy- anisole, 3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenyl stearate, bis-(3,5-di-tert-butyl-4-hydroxyphenyl) adipate.
• Hydroxylated thiodiphenyl ethers for example 2,2'-thiobis(6-tert-butyl-4-methyl- phenol), 2,2'-thiobis(4-octylphenol), 4,4'-thiobis(6-tert-butyl-3-methylphenol), 4,4'-thio- bis(6-tert-butyl-2-methylphenol), 4,4'-thiobis-(3,6-di-sec-amylphenol), 4,4'-bis-(2,6-dim- ethyl-4-hydroxyphenyl) disulfide.
• 2,2'-thiobis(6-tert-butyl-4-methyl- phenol 2,2'-thiobis(4-octylphenol), 4,4'-thiobis(6-tert-butyl-3-methylphenol), 4,4'-thio- bis(6-tert-butyl-2-methylphenol), 4,4'-thiobis-(3,6-di-sec-amy
• Alkylidenebisphenols for example 2,2'-methylenebis(6-tert-butyl-4-methylphenol), 2,2'-methylenebis(6-tert-butyl-4-ethylphenol), 2,2'-methylenebis[4-methyl-6-( ⁇ -methyl- cyclohexyl)phenol], 2,2'-methylenebis(4-methyl-6-cyclohexylphenol), 2,2'-methylene- bis(6-nonyl-4-methylphenol), 2,2'-methylenebis(4,6-di-tert-butylphenol), 2,2'-ethylidene- bis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2'-methy- lenebis[6-( ⁇ -methylbenzyl)-4-nonylphenol], 2,2'-methylenebis[6-( ⁇ , ⁇ -dimethylbenzylphenol
• O-, N- and S-benzyl compounds for example S.S ⁇ '.S'-tetra-tert-butyM ⁇ '-dihydroxy- dibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tris-(3,5-di-tert- butyl-4-hydroxybenzyl)amine, bis(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithio- terephthalate, bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, isooctyl-3,5di-tert-butyl-4- hydroxybenzylmercaptoacetate.
• S.S ⁇ '.S'-tetra-tert-butyM ⁇ '-dihydroxy- dibenzyl ether octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate
• Hydroxybenzylated malonates for example dioctadecyl-2,2-bis-(3,5-di-tert-butyl-2- hydroxybenzyl)-malonate, di-octadecyl-2-(3-tert-butyl-4-hydroxy-5-methylbenzyl)-malo- nate, di-dodecylmercaptoethyl-2,2-bis-(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, bis- [4-(l,l,3,3-tetramethylbutyl)phenyl]-2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.
• Aromatic hydroxybenzyl compounds for example l,3,5-tris-(3,5-di-tert-butyl-4-hy- droxybenzyl)-2,4,6-trimethylbenzene, l,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6- tetramethylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol.
• Triazine Compounds, for example 2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl-4- hydroxyanilino)-l,3,5-triazine, 2-octylmer?apto-4,6-bis(3,5-di-tert-butyl-4-hydroxy- anilino)-l,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyphenoxy)- 1,3,5-triazine, 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenoxy)-l,2,3-triazine, 1,3,5-tris- (3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, l,3,5-tris(4-tert-butyl-3-hydroxy-2,6-di- methylbenzyl)
• Benzylphosphonates for example dimethyl-2,5-di-tert-butyl-4-hydroxybenzylphos- phonate, diethyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl3,5-di-tert- butyl-4-hydroxybenzylphosphonate, dioctadecyl-5-tert-butyl-4-hydroxy3-methylbenzyl- phosphonate, the calcium salt of the monoethyl ester of 3,5-di-tert-butyl-4-hydroxybenzyl- phosphonic acid.
• esters of ⁇ -(3,5-di-tert-butyl-4-hvdroxyphenyl)propionic acid with mono- or poly ⁇ hydric alcohols e.g. with methanol, ethanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis(hy- droxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, tri- methylolpropane, 4-hydroxymethyl-l-phospha-2,6,7-trioxabicyclo[2.2.2]oct
• esters of ⁇ -(5-tert-butyl-4-hvdroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols e.g. with methanol, ethanol, octadecanol, 1,6-hexanediol, 1,9-nonane- diol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis- (hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, tri- methylolpropane, 4-hydroxymethyl-l-phospha-2,6,7-trioxabicyclo[2.2.2]octane.
• esters of ⁇ -(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or poly ⁇ hydric alcohols e.g. with methanol, ethanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis(hy- droxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, tri- methylolpropane, 4-hydroxymethyl-l-pho ⁇ pha-2,6,7-trioxabicyclo[2.2.2]octane.
• esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols e.g. with methanol, ethanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethy ⁇ lene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl) isocyanurate, N,N'-bis(hydroxy- ethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpro- pane, 4-hydroxymethyl-l-phospha-2,6,7-trioxabicyclo[2.2.2]octane.
• 2-(2 , -Hvdroxyphenyl)benzotriazoles for example 2-(2'-hydroxy-5'-methylphenyl)- benzotriazole, 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(5'-tert-butyl-2'- hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-5'-(l,l,3,3-tetramethylbutyl)phenyl)benzo- triazole, 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl- 2'-hydroxy-5'-methylphenyl)-5-chloro-benzotriazole, 2-(3'-sec-butyl-5'-tert-butyl-2'- hydroxyphenyl)benzotriazole, 2-(2' -hydroxy-5'-
• 2-Hydroxybenzophenones for example the 4-hydroxy, 4-methoxy, 4-octyloxy, 4-de- cyloxy, 4-dodecyloxy, 4-benzyloxy, 4,2',4'-trihydroxy and 2'-hydroxy-4,4'-dimethoxy derivatives.
• Esters of substituted and unsubstituted benzoic acids as for example 4-tertbutyl- phenyl salicylate, phenyl salicylate, octylphenyl salicylate, dibenzoyl resorcinol, bis(4- tert-butylbenzoyl) resorcinol, benzoyl resorcinol, 2,4-di-tertbutylphenyl 3,5-di-tert-butyl- 4-hydroxybenzoate, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl 3,5-di-tert- butyl-4-hydroxybenzoate, 2-methyl-4,6-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxy- benzoate.
• Nickel compounds for example nickel complexes of 2,2'-thio-bis-[4-(l,l,3,3-tetra- methylbutyl)phenol], such as the 1:1 or 1:2 complex, with or without additional ligands such as n-butylamine, triethanolamine or N-cyclohexyldiethanolamine, nickel dibutyldi- thiocarbamate, nickel salts of the monoalkyl esters, e.g. the methyl or ethyl ester, of 4- hydroxy-3,5-di-tert-butylbenzylphosphonic acid, nickel complexes of ketoximes, e.g. of 2-hydroxy-4-methylphenyl undecylketoxime, nickel complexes of l-phenyl-4-lauroyl-5- hydroxypyrazole, with or without additional ligands.
• additional ligands such as n-butylamine, triethanolamine or N-cyclohexyldiethanolamine, nickel di
• Sterically hindered amines for example bis(2,2,6,6-tetramethyl-piperidyl)sebacate, bis(2,2,6,6-tetramethyl-piperidyl)succinate, bis( 1 ,2,2,6,6-pentamethylpiperidyl)sebacate, bis(l,2,2,6,6-pentamethylpiperidyl) n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate, the condensate of l-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succi- nic acid, the condensate of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenedi- amine and 4-tert-octylamino-2,6-dichloro-l,3,5-triazine, tris(2,2,6,6-tetramethyl-4-pi
• Oxamides for example 4,4'-dioctyloxyoxanilide, 2,2'-dioctyloxy-5,5'-di-tert-butox- anilide, 2,2'-didodecyloxy-5,5'-di-tert-butoxanilide, 2-ethoxy-2'-ethoxanilide, N,N'- bis(3-dimethylaminopropyl)oxamide, 2-ethoxy-5-tert-butyl-2'-ethoxanilide and its mix ⁇ ture with 2-ethoxy-2'-ethyl-5,4'-di-tert-butoxanilide and mixtures of ortho- and para- methoxy-disubstituted oxanilides and mixtures of o- and p-ethoxy-disubstituted oxani- lides.
• Metal deactivators for example N,N'-diphenyloxamide, N-salicylal-N'-salicyloyl hydrazine, N,N'-bis(salicyloyl) hydrazine, N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenyl- propionyl) hydrazine , 3-salicyloylamino-l,2,4-triazole, bis(benzylidene)oxalyl di- hydrazide, oxanilide, isophthaloyl dihydrazide, sebacoyl bisphenylhydrazide, N,N'-di- acetyladipoyl dihydrazide, N,N'-bis(salicyloyl)oxalyl dihydrazide, N,N'-bis(salicyloyl)- thiopropionyl dihydrazide.
• Phosphites and phosphonites for example triphenyl phosphite, diphenyl alkyl phos ⁇ phites, phenyl dialkyl phosphites, tris(nonylphenyl) phosphite, trilauryl phosphite, triocta- decyl phosphite, distearyl pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phos ⁇ phite, diisodecyl pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)-pentaeryt hritol diphosphite, diisode- cyloxypentaerythri
• Peroxide scavengers for example esters of ⁇ -thiodipropionic acid, for example the lauryl, stearyl, myristyl or tridecyl esters, mercaptobenzimidazole or the zinc salt of 2-mercaptobenzimidazole, zinc dibutyldithiocarbamate, dioctadecyl disulfide, penta ⁇ erythritol tetrakis( ⁇ -dodecylmercapto)propionate.
• esters of ⁇ -thiodipropionic acid for example the lauryl, stearyl, myristyl or tridecyl esters
• mercaptobenzimidazole or the zinc salt of 2-mercaptobenzimidazole zinc dibutyldithiocarbamate
• dioctadecyl disulfide penta ⁇ erythritol tetrakis( ⁇ -dodec
• Polyamide stabilisers for example, copper salts in combination with iodides and/or phosphorus compounds and salts of divalent manganese.
• Basic co-stabilisers for example, melamine, polyvinylpyrrolidone, dicyandiamide, tri- allyl cyanurate, urea derivatives, hydrazine derivatives, amines, polyamides, polyure- thanes, alkali metal salts and alkaline earth metal salts of higher fatty acids for example calcium stearate, zinc stearate, magnesium behenate, magnesium stearate, sodium rici- noleate and potassium palmitate, antimony pyrocatecholate or tin pyrocatecholate.
• Basic co-stabilisers for example, melamine, polyvinylpyrrolidone, dicyandiamide, tri- allyl cyanurate, urea derivatives, hydrazine derivatives, amines, polyamides, polyure- thanes, alkali metal salts and alkaline earth metal salts of higher fatty acids for example calcium stearate, zinc stearate, magnesium behenate,
• Nucleating agents for example, 4-tert-butylbenzoic acid, adipic acid, diphenylacetic acid.
• Fillers and reinforcing agents for example, calcium carbonate, silicates, glass fibres, asbestos, talc, kaolin, mica, barium sulfate, metal oxides and hydroxides, carbon black, graphite. 10.
• Other additives for example, plasticisers, lubricants, emulsifiers, pigments, optical brighteners, flameproofing agents, antistatic agents and blowing agents.
• Benzofuranones and indolinones for example those disclosed in US-A-4325 863, US-A-4338 244 or US-A-5 175312, or 3-[4-(2-acetoxyethoxy)phenyl]-5,7-di-tert-butyl- benzofuran-2-one, 5,7-di-tert-butyl-3-[4-(2-stearoyloxyethoxy)phenyl]benzofuran-2-one, 3,3'-bis[5,7-di-tert-butyl-3-(4-[2-hydroxyethoxy]phenyl)benzofuran-2-one], 5,7-di-tert-bu- tyl-3-(4-ethoxyphenyl)benzofuran-2-one, 3-(4-acetoxy-3,5-dimethylphenyl)-5,7-di-tert- butyl-benzofuran-2-one, 3-(3,5-dimethyl-4-pi
• the co-stabilizers with the exception of the benzofuranones listed under 11, are added for example in concentrations of 0.01 to 10%, relative to the total weight of the material to be stabilized.
• compositions comprise, in addition to components (a) and (b) further additives, in particular phenolic antioxidants, light stabilizers or processing stabilizers.
• Particularly preferred additives are phenolic antioxidants (item 1 of the list), sterically hin ⁇ dered amines (item 2.6 of the list), phosphites and phosphonites (item 4 of the list) and peroxide-destroying compounds (item 5.) of the list.
• additives which are also particularly preferred are benzofuran-2- ones, such as described, for example, in US-A-4325 863, US-A-4338 244 or US-A-5 175 312.
• R ⁇ is phenyl or phenyl which is substituted by 1 to 3 alkyl radicals together having at most 18 carbon atoms, alkoxy having 1 to 12 carbon atoms, alkoxycarbonyl having 2 to 18 carbon atoms or chlorine;
• R 12 is hydrogen
• R 14 is hydrogen, alkyl having 1 to 12 carbon atoms, cyclopentyl, cyclohexyl or chlorine;
• R 13 has the meaning of R 12 or R 14 or is a radical of the formula ,
• R 16 is hydrogen, alkyl having 1 to 18 carbon atoms, alkyl having 2 to 18 carbon atoms which is interrupted by oxygen or sulfur, dialkylaminoalkyl having a total of 3 to 16 carbon atoms, cyclopentyl, cyclohexyl, phenyl or phenyl which is substituted by 1 to 3 alkyl radicals together having at most 18 carbon atoms; n is 0, 1 or 2; the substituents R 17 , independently of one another, are hydrogen, alkyl having 1 to 18 carbon atoms, cyclopentyl, cyclohexyl, phenyl, phenyl which is substituted by 1 or 2 alkyl radicals together having at most 16 carbon atoms, a radical of the formula -C 2 H 4 OH,
• R 2 o is hydrogen, alkyl having 1 to 22 carbon atoms or cycloalkyl having 5 to 12 carbon atoms;
• A is alkylene having 2 to 22 carbon atoms which may be interrupted by nitrogen, oxygen or sulfur;
• R 18 is hydrogen, alkyl having 1 to 18 carbon atoms, cyclopentyl, cyclohexyl, phenyl, phenyl which is substituted by 1 or 2 alkyl radicals together having at most 16 carbon atoms, or is benzyl;
• R 19 is alkyl having 1 to 18 carbon atoms
• D is -O-, -S-, -SO-, -SO 2 - or -C(R 2 ⁇ ) 2 - ;
• the substituents R 2 ⁇ independently of one another, are hydrogen, C r C 16 alkyl, the two R 21 together containing 1 to 16 carbon atoms, R 2 ⁇ is furthermore phenyl or a radical of the
• E is a radical of the formula
• R ⁇ , R 12 and R 14 are as defined above;
• R 15 is hydrogen, alkyl having 1 to 20 carbon atoms, cyclopentyl, cyclohexyl, chlorine or a
• R 13 is hydrogen, alkyl having 1 to 12 carbon atoms, cyclopentyl, cyclohexyl, chlorine or a radical of the formula
• R 16 is in particular hydrogen, alkyl having 1 to 18 carbon atoms, cyclopentyl or cyclohexyl.
• R ⁇ is phenyl or phenyl which is substituted by 1 or 2 alkyl radicals together having at most 12 carbon atoms
• R 12 is hydrogen
• R 14 is hydrogen or alkyl having 1 to 12 carbon atoms
• R 13 is hydrogen, alkyl having 1 to 12 carbon atoms
• R 15 is hydrogen, alkyl having 1 to 20 carbon atoms, o
• R n is phenyl
• R 13 is hydrogen, alkyl having 1 to 12 carbon atoms or -D-E
• R 12 and R 14 independently of one another, are hydrogen or alkyl having 1 to 4 carbon atoms
• R 15 is alkyl having 1 to 20 carbon atoms, D and E being as defined at the beginning.
• R ⁇ is phenyl
• R 13 is alkyl having 1 to 4 carbon atoms or -D-E
• R 12 and R 14 are hydrogen
• R 15 is alkyl having 1 to 4 carbon atoms, cyclopentyl or cyclohexyl, D being a group -C(R 2 ⁇ ) 2 - and E being a radical of the formula
• R 2 ⁇ being identical to or different from one another and each being alkyl having 1 to 4 carbon atoms, and R ⁇ , R 12 , R 14 and R 15 being as defined.
• the amount of additional additives, in particular stabilizers, for example of the benzofu- ran-2-ones mentioned, can vary within wide limits. For example, 0.0005 to 10, preferably 0.001 to 5, in particular 0.01 to 2, % by weight thereof can be present in the compositions according to the invention.
• the alpha, monoclinic crystalline modification according to the invention can also be added before or during polymerization or before crosslinking.
• the alpha, monoclinic crystalline modification according to the invention can be incorpo ⁇ rated in the material to be stabilized in pure form or encapsulated in waxes, oils or poly ⁇ mers.
• the alpha, monoclinic crystalline modification according to the invention can also be sprayed onto the polymer to be stabilized. They are capable of diluting other additives (for example the abovementioned customary additives) or their melts, thus enabling them to be sprayed onto the polymer to be stabilized also together with these additives. Addition by spraying during deactivation of the polymerization catalysts is particularly advantageous, it being possible, for example, for the steam used for deactivation to be used for spraying.
• the materials thus stabilized can be used in a wide range of forms, for example as films, fibres, tapes, moulding compositions, profiles or as binders for paints, adhesives or ce ⁇ ments.
• the organic materials to be protected are preferably organic, in par ⁇ ticular synthetic, polymers.
• the materials being protected are particularly advan ⁇ tageously thermoplastic materials, in particular polyolefins.
• the excellent efficiency of the alpha, monoclinic crystalline form of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl- l,l'-biphenyl-2,2'-diyl) phosphite] as processing stabilizer (thermal stabilizer) should be mentioned in particular. To this end, it is advantageously added to the polymer before or during its processing.
• Lubricants are known to one skilled in the art and described in the relevant technical literature, for example in Dieter Klamann, “Schmierstoffe und ver- wandte Kunststoff” (Verlag Chemie, Weinheim 1982), in Schewe-Kobek, “Das Schmier- stoff-Taschenbuch” (Dr. Alfred H ⁇ thig- Verlag, Heidelberg, 1974) and in “Ullmanns Enzyklopadie der ischen Chemie” vol. 13, pages 85-94 (Verlag Chemie, Weinheim, 1977).
• a preferred embodiment of the present invention is the use of the alpha, mo ⁇ noclinic crystalline form of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-l, -bi- phenyl-2,2'-diyl) phosphite] for stabilizing organic materials against oxidative, thermal or light-induced degradation.
• the alpha, monoclinic crystalline modification according to the invention is preferably used as processing stabilizer (thermal stabilizer) of thermoplastic polymers.
• the present invention also provides a process for stabilizing an organic material against oxidative, thermal or light-induced degradation, which comprises incorporating therein or applying thereto the alpha, monoclinic crystalline form of (3,3',5,5'-tetra-tert-butyl-l,l'-biphenyl-2,2'-diyl) phosphite].
• DSC Differential scanning calorimetry
• X-ray diffraction patterns are recorded on a Philips Norelco X-ray Diffractometer unit, using Cu-K ⁇ radiation with a nickel filter.
• Example 1 The examples which follow further illustrate the invention. The parts or percentages given are by weight. Example 1:
• Suitable crystals for X-ray analysis are grown from ethyl acetate.
• a thick hexagonal plate is selected and broken to reduce the largest dimension to less than 1 mm.
• Intensity data are measured on a Siemens R3MV four circle diffractome- ter as described in Table 3 below.
• the structure is solved by direct methods using Siemens SHELXTL PLUS (VMS). Full-matrix least-square refmements are carried out.
• the rela ⁇ tive absolute configuration is determined to be R*, R*, R*.
• This example illustrates the superior flowability properties of the new alpha crystalline modification of the compound of formula I prepared in Example 1 as compared to the flow properties of the compound of formula I as prepared according to the procedure of Example 4 of US-A-4 318 845.
• Example 3 Process Stabilization of Polypropylene at 274°C.
• the base formulation comprises unstabilized, high yield/high selectivity catalyzed poly ⁇ propylene (PROFAX® 6501, Batch No. BD07155, produced by Himont) containing 0.075% by weight of calcium stearate.
• the test additives are incorporated into the poly ⁇ propylene by dry blending or, when the additive is a liquid, using a minimum amount of methylene chloride solvent The solvent is then removed by evaporation under reduced pressure.
• the stabilized resin formulation is extruded at 90 rpm from a 2.54 cm diameter extruder at 274°C with a residence time of 90 seconds.
• melt flow rate (in grams 10 minutes) is determined by ASTM method D1238 on the pellets obtained from the extruder.
• the melt flow rate is a measure of the molecular weight of the polymer and indicates whether thermal degradation is occurring during melt processing by extrusion. A minimum change in melt flow rate is favored and indicates good melt processing stabilization. A substantial increase in the melt flow de ⁇ notes pronounced chain degradation, i.e. poor stabilization. The results are given in Table 5 below.
• AO A is neopentanetetrayl tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate).
• Example 4 Comparison of the X-ray diffraction data of the alpha, monoclinic crystalline form of formula I according to the invention (compound A) and the compound of formu ⁇ la I as prepared according to the procedure of Example 4 of US-A-4318 845 (com ⁇ pound B).
• the unit cell of compound B contains an entrapped molecule of toluene. This was not re ⁇ cognized by the authors of US-A-4318 845 or they failed to mention it. In constrast, the crystal cell of compound A of the instant invention does not contain a molecule of solvent from any of the claimed recrystallization solvent systems.

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