Stabilized vinyl chloride polymer compositions

Details Stabilized vinyl chloride polymer compositions Stabilized vinyl chloride polymer compositions

1998-02-25

1999-11-16

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524104, 524105, 524111, C08K 545, C08K 53415, C08K 515

Patent

active

059859598

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to stabilised vinyl chloride poisoner compositions.
The temperatures required during the processing of vinyl chloride polymers and co-polymers, by moulding, extruding and casting techniques, are of the order of 180-200.degree. C. These elevated temperatures cause degradation of the polymer leading to undesirable colour formation and detrimental effects on the mechanical properties of the end product.
The problems of degradation may be reduced by the use of additives such as metal inorganic salts and metal carboxylates. Further improvement in the retardation of the detrimental degradation is provided by organophosphites, epoxidised esters or oils, hindered phenolic antioxidants and polyols.
In U.S. Pat. No. 2,307,075 and U.S. Pat. No. 2,669,548 the beneficial effects of adding metal chelates of certain dicarbonyl compounds specifically .beta.-ketoesters are disclosed. GB1,511,621 offers further improvements by the combination of divalent metal salts of carboxylic acids together with a dicarbonyl organic compound. More recently EP46161 covered the use of metal salts of bis .beta.-diketones and compared their performance with Zinc salts of commercially available .beta.-diketones. In U.S. Pat. No. 4,221,697 metal salts of .beta.-diketones are also described.
The present invention seeks to provide an alternative stabilisation system.
According to the present invention there is provided a composition based on polymer and/or co-polymers of vinyl chloride comprising the following compounds expressed by weight percent relative to the weight of polymer/co-polymer used. metal salts of a carboxylic acid or phenol; and general formula A. ##STR2## in which R.sub.1 represents a linear or branched alkylene or alkenylene radical having up to 20 carbon atoms, an aralkylene radical having from 7 to 20 carbon atoms or an arylene or cycloalkylene radical having from 6 to 20 carbon atoms, the cycloalkylene radicals optionally containing carbon-carbon double bonds; these radicals optionally being unsubstituted or substituted for example by one or more halogen atoms or hydroxyl groups or, for aryl or cycloalkylene radicals, by one or more methyl, ethyl and methoxy radicals, the above mentioned radicals optionally also being modified by the presence in an aliphatic chain of one or more --O--, --CO-- or --CO.sub.2 -chain members or N; R.sub.2 represents O. S, NR.sub.5 or NNHR.sub.5 wherein R.sub.5 is defined as R.sub.1, H or C(S)NHR.sub.6 wherein.sub.6 is defined as R.sub.1 or H; R.sub.3 and R.sub.4 are defined as R.sub.1 or H and can be the same or different; A is either, S or NR.sub.7, with R.sub.7 defined as R.sub.1 and H.
The metals used for the above complexes can be chosen from the alkali or alkaline erths; they may be divalent or monovalent transition metal ions or tetravalent or divalent tin. Those preferred for this invention are barium, cadmium, zinc, magnesium, calcium, sodium. potassium, strontium or tin.
Examples of metal salts based on compound A are give in Table 1. ##STR3##


TABLE 1 __________________________________________________________________________ R.sub.2 = O Name Preparation Compound A R.sub.1 R.sub.3 M.sup.n+ (all isomers) method __________________________________________________________________________ I N-phenyl CH.sub.3 H Zn(II) N-phenyl A 3-acetylpyrrolidine 2,4 dione, Zinc complex II N-phenyl " " Ca(II) N-phenyl B 3-acetylpyrrolidine 2,4 dione, Calcium complex III N-phenyl " " Ba(II) N-phenyl A 3-acetylpyrrolidine 2,4 dione, Barium complex IV N-phenyl " " Na(I) N-phenyl A 3-acetylpyrrolidine 2,4 dione, Sodium salt V N-phenyl " " K(I) N-phenyl A 3-acetylpyrrolidine 2,4 dione, Potassium salt VI N-phenyl " " Mg(II) N-phenyl A 3-acetylpyrrolidine 2,4 dione, Magnesium complex VII 1 " " Na(I) N-p-methoxyphenyl 3-acetylpyrrolidine 2,4 dione, Sodium salt A VIII " " " K(I) N-p-methoxyphenyl A 3-acetylpyrrolidine 2,4 dione, Potassium salt IX " " " Ca(II) N-p-methoxyphenyl B

REFERENCES:
patent: 5744525 (1998-04-01), Harvey et al.
WO, A, 95/16739 (AKCROS Chemicals) Jun. 22, 1995.

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