Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2001-07-09
2003-08-26
Sanders, Kriellion A. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S425000, C524S447000, C524S449000
Reexamination Certificate
active
06610765
ABSTRACT:
The present invention relates to compositions comprising a synthetic polymer subject to oxidative, thermal or light-induced degradation, in particular a thermoplastic polymer, and as additives at least one additive selected from the stabiliser, antistatic agent, nucleating agent, biocide and/or flame retardant group, and at least one polymeric dispersing or solvating agent having amphiphilic properties, to the use of these additives in synthetic polymers, in particular thermoplastic polymers, as well as to a process for stabilising these synthetic polymers, with the proviso that at least one additive contains a compound from the stabiliser group.
This invention also relates to the use of the polymeric dispersing or solvating agents having amphiphilic properties for the improved dispersion of additives selected from the stabiliser, antistatic agent, nucleating agent and/or biocide group in synthetic polymers, and to a process for the improved dispersion of additives selected from the stabiliser, antistatic agent, nucleating agent and/or biocide group in synthetic polymers.
The effect of synthetic additives depends, for example, on the chemical structure of the additives, on the composition of additive blends, on the dispersion of the additives in the plastic material, on the solubility of the additives in the respective polymer and on the compatibility of the additives with the polymeric matrix. An enhanced compatibility of additives with polymeric substrates, and thus an enhanced effect, can be achieved, for example, through the preparation of preblends. So-called masterbatches or concentrates, which are a preblend of a polymer with additives in high concentrations, are also often used, the subsequent use of this masterbatch making it possible for the additive to be dispersed in the polymer matrix more easily and better than when it is added directly. Although these techniques are very well known, methods are still sought by which the performance of additives may be further improved, i.e. for making full use of them.
Accordingly, this invention has for its object to provide compositions which enhance the effect of existing additives in synthetic polymers, in particular by improved dispersion.
U.S. Pat. No. 5,387,467 discloses the use of organopolysiloxanes with ester groups and long-chain alkyl groups, said groups being bound via carbon atoms to silicium atoms, for modifying the surface of fine particles, such as pigments and fillers, or of glass fibres.
It has now been found that the effect of additives selected from the stabiliser, antistatic agent, nucleating agent, biocide and/or flame retardant group in synthetic polymers is enhanced by the addition of at least one polymeric dispersing or solvating agent having amphiphilic properties. Synthetic polymers thus enhanced are distinguished by having excellent stability against oxidative, thermal or light-induced degradation.
This invention therefore relates to compositions, which comprise
a) a synthetic polymer subject to oxidative, thermal or light-induced degradation,
b) at least one additive selected from the stabiliser, antistatic agent, nucleating agent, biocide and/or flame retardant group, and
c) at least one polymeric dispersing or solvating agent having amphiphilic properties.
Examples of antistatic agents are described in R. Gächter and H. Müller, Hanser Verlag, 3
rd
edition, 1990, pages 749-775. Particularly interesting antistatic agents are those selected from the group consisting of the ethoxylated alkylamines, fatty acid esters, alkyl sulfonates and polymeric systems based on polyamide copolymers, such as Irgastat®P22, of Ciba Spezialitätenchemie.
Examples of biocides are described in R. Gächter and H. Müller, Hanser Verlag, 3
rd
edition, 1990, pages 791-809. Particularly interesting biocides are those selected from the group consisting of the 10,10′-oxy-bis-phenoxarsines, N-(trihalogenomethlythio)phthalimides, di-phenyl-antimonium-2-ethylhexanoate, copper-bis(8-hydroxyquinoline), tributyltin oxide and the derivatives thereof; halogenated phenols, such as Irgaguard® (Trichlosan CAS number 3380-34-5, Ciba Spezialitätenchemie AG); methylthio-s-triazines, such as 2-methylthio-4-cyclopropylamino-6-(&agr;, &bgr;-dimethylpropylamino)-s-triazine, 2-methylthio-4-cyclopropylamino-6-tert-butylamino-s-triazine and 2-methylthio-4-ethylamino-6-(&agr;, &bgr;-dimethylpropylamino)-s-triazine.
Preferred compositions are those, wherein component (b) is a stabiliser and/or nucleating agent.
Examples of stabilisers are the following:
1. Antioxidants
1.1. Alkylated 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-(&agr;-methylcyclohexyl)-4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol, nonylphenols which are linear or branched in the side chains, for example, 2,6-di-nonyl-4-methylphenol, 2,4dimethyl-6-(1′-methylundec-1′-yl)phenol, 2,4-dimethyl-6-(1′-methylheptadec-1′-yl)phenol, 2,4-dimethyl-6-(1′-methyltridec-1′-yl)phenol and mixtures thereof.
1.2. Alkylthiomethylphenols, for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-di-dodecylthiomethyl-4-nonylphenol.
1.3. Hydroquinones and alkylated hydroquinones, for example 2,6-di-tert-butyl-4-methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-octadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenyl stearate, bis-(3,5-di-tert-butyl-4-hydroxyphenyl)adipate.
1.4. Tocopherols, for example &agr;-tocopherol, &bgr;-tocopherol, &ggr;-tocopherol, &dgr;-tocopherol and mixtures thereof (Vitamin E).
1.5. Hydroxylated thiodiphenyl ethers, for example 2,2′-thiobis(6-tert-butyl-4-methylphenol), 2,2′-thiobis(4-octylphenol), 4,4′-thiobis(6-tert-butyl-3-methylphenol), 4,4′-thiobis(6-tert-butyl-2-methylphenol), 4,4′-thiobis-(3,6-di-sec-amylphenol), 4,4′-bis(2,6-dimethyl-4-hydroxyphenyl)disulfide.
1.6. 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-(&agr;-methylcyclohexyl)phenol], 2,2′-methylenebis(4-methyl-6-cyclohexylphenol), 2,2′-methylenebis(6-nonyl-4-methylphenol), 2,2′-methylenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2′-methylenebis[6-(&agr;-methylbenzyl)-4-nonylphenol], 2,2′-methylenebis[6-(&agr;,&agr;-dimethylbenzyl)-4-nonylphenol], 4,4′-methylenebis(2,6-di-tert-butylphenol), 4,4′-methylenebis(6-tert-butyl-2-methylphenol), 1,1-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 2,6-bis(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenol, 1,1,3-tris(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 1,1-bis(5-tert-butyl-4-hydroxy-2-methyl-phenyl)-3-n-dodecylmercaptobutane, ethylene glycol bis[3,3-bis(3′-tert-butyl-4′-hydroxyphenyl)butyrate], bis(3-tert-butyl-4-hydroxy-5-methyl-phenyl)dicyclopentadiene, bis[2-(3′-tert-butyl-2′-hydroxy-5′-methylbenzyl)-6-tert-butyl-4-methylphenyl]terephthalate, 1,1-bis-(3,5-dimethyl-2-hydroxyphenyl)butane, 2,2-bis-(3,5-di-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis-(5-tert-butyl-4-hydroxy2-methylphenyl)-4-n-dodecylmercaptobutane, 1,1,5,5-tetra-(5-tert-butyl-4-hydroxy-2-methylphenyl)pentane.
1.7. O-, N- and S-benzyl compounds, for example 3,5,3′,5′-tetra-tert-butyl-4,4′-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tridecyl-4-hydroxy-3,5-di-tert-butylbenzylmercaptoacetate, tris(3,5-di-tert-butyl-4-hydroxybenzyl)amine, bis(4-tert-butyl-3
Hoffmann Kurt
Meyer Felix
Pfaendner Rudolf
Rotzinger Bruno
Ciba Specialty Chemicals Corporation
Mansfield Kevin T.
Sanders Kriellion A.
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