Thermoplastic molding compounds

Abstract

Polymeric moulding compositions include iron oxalate as a stabilizer system to improve the stability of the moulding compositions with respect to adverse thermooxidative and/or photooxidative effects.

What is claimed is: 
     
         1 . A polymeric moulding composition comprising:
 (1) 10 to 99.85% by weight of polymer;   (2) 0.05 to 10% by weight of iron oxalate; and   (3) 0.1 to 70% by weight of other ingredients different from components (1) and (2),   
       where the total of all of the percentages by weight is always 100% by weight; and 
       the polymer in the composition consists of non-chlorinated polymer, 
     
     
         2 . The moulding composition according to  claim 1 , wherein the iron oxalate is iron(II) oxalate dihydrate. 
     
     
         3 . The moulding composition according to  claim 1 , wherein the at least one polymer is semicrystalline polyamide or semicrystalline polyester. 
     
     
         4 . The moulding composition according to  claim 1 , wherein the at least one polymer is at least one aliphatic polyamide, or a blend of at least one aliphatic polyamide and a polyalkylene, and the aliphatic polyamide is a polyamide produced from one or more of the monomers: adipic acid, 2,2,4-trimethyladipic acid, 2,4,4-trimethyladipic acid, azelaic acid, sebacic acid, tetramethylenediamine, hexamethylenediamine, 2-methylpentane-1,5-diamine, 1,9-nonandiamine, 2,2,4- and 2,4,4-trimethylhexamethylenediamine, the isomers of diaminodicyclohexylmethane, diaminodicyclohexylpropane, bisaminomethylcyclohexane, and ε-caprolactam. 
     
     
         5 . The moulding composition according to  claim 1 , wherein the at least one polymer is a polyamide produced from one or more of the following monomers: ε-caprolactam, adipic acid, terephthalic acid, hexamethylenediamine, tetramethylenediamine, or 2-methylpentane-1,5-diamine. 
     
     
         6 . The moulding composition according to  claim 1 , wherein the at least one polymer is at least one of PA6, PA66, PA46, PA12, and copolyamides thereof. 
     
     
         7 . The moulding composition according to  claim 1 , wherein the other ingredients comprise at least one additive from the group of heat stabilizers different from component (2), UV stabilizers, gamma-radiation stabilizers, hydrolysis stabilizers, antistatic agents, emulsifiers, nucleating agents, plasticizers, processing aids, impact modifiers, lubricants, mould-release agents, dyes or pigments. 
     
     
         8 . The moulding composition according to  claim 1 , further comprising (4) 5 to 70% by weight of fillers or reinforcing materials, where the proportions of components (1) to (3) are reduced in such a way that the total of all of the percentages by weight is 100. 
     
     
         9 . The thermoplastic moulding composition according to  claim 1 , wherein:
 the non-chlorinated polymer is PA6, PA66, or a copolyamide of PA6 or PA66;   the iron oxalate is iron(II) oxalate dihydrate; and   the other ingredients include at least one non-chlorine containing additive selected from the group consisting of heat stabilizers different from component (2), UV stabilizers, gamma-radiation stabilizers, hydrolysis stabilizers, antistatic agents, emulsifiers, nucleating agents, plasticizers, processing aids, impact modifiers, lubricants, mould-release agents, dyes, and pigments.   
     
     
         10 . A method for stabilizing polymers and/or products produced from the polymers against thermo-oxidative and/or photo-oxidative degradation, the method comprising including 0.05 to 10% by weight of iron oxalate into the polymer during production of the polymer. 
     
     
         11 . The method of  claim 10 , wherein the products produced from the polymers include foils, fibres or mouldings of items for the electrical industry, electronics industry, telecommunications-industry, information technology industry, solar industry, or computer industry, for the household, for sports, for medical applications, for the consumer electronics industry, or for motor vehicles. 
     
     
         12 . Fibres, foils or mouldings having improved resistance to thermo-oxidative and/or photo-oxidative degradation, wherein the fibres, foils or mouldings are obtained via injection moulding, extrusion or blow moulding of the moulding composition according to  claim 1 . 
     
     
         13 . A process for the production of the moulding composition according to  claim 1 , the process comprising mixing components (1) to (3) in the designated parts by weight, at a reaction temperature sufficient for the reaction of the iron oxalate, and sufficient to melt the polymer. 
     
     
         14 . The process according to  claim 13 , comprising:
 premixing the iron oxalate with the at least one polymer to form a first mixture;   heating the first mixture to a temperature of at least the reaction temperature to form a heated mixture; and   mixing the other ingredients into the heated mixture.   
     
     
         15 . The process according to  claim 14 , wherein the reaction temperature is 100° C. to 450° C. 
     
     
         16 . The process according to  claim 14 , wherein the reaction temperature is 220° C. to 400° C., and the mixing comprises at least one of combining, mixing, kneading, compounding, extrusion or rolling.