Synonyms: IRGANOX ;IRGANOX WL;Einecs ; ANTIOXIDANT ;ylester,calciumsalt();ANTIOXIDANT (IRGANOX );calciuM. Irganox® Recommended use of the chemical and restriction on use. Recommended use*: stabilizer. Unsuitable for use: This material is. Used as an antioxidant for polypropylene fibers. Offers good processing stability. Provides very high extraction resistance and extreme low volatility.

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A1 Designated state s: The procedure of Examples is repeated. Hydroquinones and alkylated hvdroquinones, for example 2,6-di-tert-butyl methoxyphenol, 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-di- phenyloctadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butylhydroxy- anisole, 3,5-di-tert-butylhydroxyanisole, 3,5-di-tert-butylhydroxyphenyl stearate, bis- 3,5-di-tert-butylhydroxyphenyl adipate.

In case of R being an alkanetetrayl radical, the tetracarboxylic dianhydride may be such as butane- 1 ,2,3,4-tetracarboxylic dianhydride. Polycarbonate and polyester blends modified with polyorganosiloxane graft polymers combined with diene rubber-based graft polymers. The aliphatic dicarboxylic acids may contain from to 2 to 40 carbon atoms, the cycloaliphatic dicarboxylic acids from 6 to 10 carbon atoms, the aromatic dicarboxylic acids from 8 to 14 carbon atoms, the aliphatic hydrocarboxylic acids from 2 to 12 carbon atoms and the aromatic and cycloaliphatic hydroxycarboxylic acids from 7 to 14 carbon atoms.

Tetracarboxylic dianhydrides useful within the scope of this invention are those of formula. 142 Free format text: Alkylthiomethylphenols, for example 2,4-dioctylthiomethyltert-butylphenol, 2,4-dioctylthiomethylmethylphenol, 2,4-dioctylthiomethylethylphenol, 2,6-di-do- decylthiomethylnonylphenol.

Derivatives of 2,2,6,6-tetramethylpiperidinol iranox use as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials. The amounts and the results obtained are set forth in Table 1. Increasing the molecular weight of polyesters The present invention relates to a process for increasing the molecular weight of polyesters and to the polyesters obtainable by said process. The recyclates may also contain minor amounts of other polymers, including polyolefins or PVC.

Metal deactivators, for example N,N’-diphenyloxamide, N-salicylal-N’-salicyloyl hydrazine, N,N’-bis salicyloyl hydrazine, N,N’-bis irgaonx propionyl hydrazine3-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.


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A process according to claim 1, wherein the tetracarboxylic dianhydride has the formula. Oligomeric chain extenders for processing, post-processing and recycling of condensation polymers, igganox, compositions and applications.

DE Free format text: As regards the chemical composition of the polyester recyclates, the particulars given above apply likewise. IT Free format text: Date of ref document: R’ and R” in this formula may be alkyl of 1 to 6 carbon atoms, halogen such as chloro or bromo and, preferably, hydrogen atoms.

A mixture of tetracarboxylic dianhydrides of different structure may also be used. Benzylphosphonates, for example dimethyl-2,5-di-tert-butylhydroxybenzylphos- phonate, diethyl-3,5-di-tert-butylhydroxybenzylphosphonate, dioctadecyl-3,5-di-tert- butylhydroxybenzylphosphonate, dioctadecyltert-butylhydroxymethylbenzyl- phosphonate, the calcium salt of the monoethyl organox of 3,5-di-tert-butylhydroxybenzyl- phosphonic acid.

If the polyesters are based on at least two monomers, said monomers can be randomly distributed, or they may be block polymers.

BE Free format text: In addition to e. Table 3 relating to Examples of this invention addition of tetracarboxylic dianhydride and hydroxyphenylalkylphosphonic acid ester or half -ester shows a marked increase in intrinsic viscosity, thereby indicating an increase in molecular weight.

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Nickel compounds, for example nickel complexes of 2,2′-thio-bis-[4- l,l,3,3-tetra- methylbutyl phenol], such as irgamox 1: The aliphatic diols may contain from 2 to 12 carbon atoms, the cycloaliphatic diols from 5 to 8 carbon atoms and the aromatic diols from 6 irgaanox 16 carbon atoms.

Very particularly preferred sterically hindered hydroxyphenylalkylphosphonic acid esters and half-esters are The process can be carried out in any heatable apparatus fitted with a stirrer. Other suitable co-compatibilisers contain in irganoxx polar groups, for example maleic anhydride-styrene copolymers or graft polymers containing acrylic acid groups.

A process according to claim 1, which comprises using a metal salt of the sterically hindered hydroxyphenylalkylphosphonic acid ester in admixture with a polyethylene wax. Aromatic hydroxybenzyl compounds, for example l,3,5-tris 3,5-di-tert-butylhy- droxybenzyl -2,4,6-trimethylbenzene, l,4-bis 3,5-di-tert-butylhydroxybenzyl -2,3,5,6- tetramethylbenzene, 2,4,6-tris 3,5-di-tert-butylhydroxybenzyl phenol.


Substituents defined as alkyl containing up to 20 carbon atoms may suitably be methyl, ethyl, propyl, butyl, pentyl, hexyl and octyl, stearyl, as well as corresponding branched isomers. Get to know more about scams to avoid: Kind code of irganoz document: The preferences in connection with said polyesters are the same as those referred to in connection with the process.

Fakirov, Kunststoffe 74and R.


In addition, mixtures of these polyesters are also suitable. The PET bottle materials originating from different manufacturers comprise polyethylene terephthalate and also copolymers of irbanox structure and composition, but with a preponderant content of PET structures.

Dicarboxylic acids that contain N-heterocyclic rings are also suitable, for example those that are derived from carboxyalkylated, carboxyphenyla- ted or carboxybenzylated monoamine-s-triazinedicarboxylic acids q. The amounts and the results obtained are set forth in Table 3.

FR Ref legal event code: Ca is particularly preferred. However, this method is troublesome and, moreover, is highly sensitive to the impurities that may be present in waste material.

These recyclates may furthermore contain standard impurities such as dye residues, 11425 residues, metal traces, fuel residues or inorganic salts. The process may, however, also be carried out in an extruder and also in the irgano of air. Surprisingly, it has been found possible to irgsnox the molecular weight of polyesters substantially by fusing the polyester and blending it with a mixture of at least one tetracarboxylic dianhydride and a sterically hindered hydroxyphenylalkylphosphonic acid ester or half-ester.

The amounts and the results obtained are set forth in Table 2. Preferred diols are the alkylene diols, 1,4-dihydroxycyclohexane and l,4-bis hydroxy- methyl cyclohexane.