Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1985-05-03
1987-04-07
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524155, 524171, C08K 541
Patent
active
046562109
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention pertains to stabilized thermoplastic molding compositions on the basis of polyvinyl chloride or essentially vinyl chloride-containing polymers.
2. Statement of the Related Art
In the molding processing of thermoplastic polymers to form pipes, bottles, shapes, films and the like, for example by extrusion, injection molding, blowing, deep drawing and calandering, degradation of the plastic can easily take place at the high temperatures thus occurring. This leads to undesirable discolorations and impairment of the mechanical properties. For this reason stabilizers are added to the polymers prior to thermal deformation to oppose such degradation. For polyvinyl chloride and essentially vinyl chloride-containing mixed polymers, the principal thermal stabilizers used are inorganic and organic lead salts, organic antimony compounds, organotin compounds, and cadmium/barium carboxylates and phenolates. The metal compounds mentioned are usually designated as primary stabilizers; secondary stabilizers or costabilizers are often added to improve their efficacy. Further details on the thermal stabilizers customarily employed for vinyl chloride polymers can be taken from the relevant literature, for example the Encyclopedia of Polymer Science and Technology, Vol. 12, New York, London, Sydney, Toronto, 1970, pp. 737 to 768.
The stabilizers mentioned show a fully satisfactory effect in practice. However, certain objections exist to the use of lead, antimony and cadmium compounds, especially toxicologic objections.
A number of organotin compounds are toxicologically unobjectionable, but their broad use is impeded by their high price. For this reason attempts have long been made to replace these compounds by less objectionable and more advantageously priced substances. For this reason it has become customary to use as primary stabilizers fatty acid salts, aromatic carboxylates and phenolates of the metals calcium, barium, zinc and aluminum, perhaps supplemented by costabilizers such as organic phosphites, imino compounds, epoxy compounds, polyhydric alcohols or 1,3-diketones. However, these new stabilizer systems involve to a greater or lesser degree the defect that they give an inadequate initial stability and/or inadequate long-term stability to the molding compositions to be stabilized. Therefore a need exists for substances with the aid of which the initial and/or long-term effect of such stabilizer systems can be decisively improved.
DESCRIPTION OF THE INVENTION
It has been found that certain .beta.-oxosulfoxides and .beta.-oxosulfones can be successfully used to stabilize polyvinyl chloride molding compositions. In particular it has been found that these compounds are able to increase the stabilizing effect of primary stabilizers on the basis of soaps, aromatic carboxylates and phenolates of the metals calcium, barium, zinc and aluminum as well as organotin compounds to a degree that could not be anticipated.
Thus the subject of the invention comprise stabilized polyvinyl chloride molding compositions, which contain at least one compound of Formula I and/or Formula II ##STR2## in which R represents an alkyl group with 1 to 18 carbon atoms, a cycloalkyl group with 5 or 6 carbon atoms, a phenyl group, an alkylphenyl group with 7 to 11 carbon atoms or an X--CO--CH.sub.2 group, while X represents an NH.sub.2 group or an OM group, in which M represents lithium, sodium or potassium.
The invention in particular includes stabilized molding compositions which, in addition to customary lubricants an other customary processing aids, contain a stabilizer combination of (1) primary stabilizers, selected from the group consisting of metal soap, aromatic metal carboxylates, metal phenolates and organotin compounds, and (2) at least one compound of Formula I and/or Formula II as costabilizers.
Also included in the invention are stabilizer combinations for polyvinyl chloride molding compositions containing primary stabilizers selected from the group consisting of m
REFERENCES:
patent: 2614095 (1952-10-01), Shelley
patent: 2981717 (1961-04-01), Boultbee
patent: 3297629 (1969-01-01), Kauder
patent: 3453225 (1969-07-01), Pollock
patent: 4217258 (1980-08-01), Minagawa et al.
patent: 4338226 (1982-07-01), Worscheck et al.
Stapfer, C. H. et al: American Chemical Society, Div. Polymer Chem., Polymer Preprints, (Mar. 1971), vol. 12, No. 1, pp. 795-802.
Shelton, J. Reid: Stabilization and Degradation of Polymers, 215-225 (1978).
Stabilization Reactions Involving Oxidized Sulphur Compounds; W. L. Hawkins and Mrs. H. Sautter.
W. L. Hawkins, H. Sautter, Synergistic Antioxidant Combinations. Mechanism of Stabilization with Organo-Sulfur Compounds, 1963, Journal of Polymer Science: Part A, vol. 1, pp. 3499-3509.
Erwied Werner
Upadek Horst
Wegemund Bernd
Greenfield Mark A.
Henkel Kommanditgesellschaft auf Aktien
Hoke Veronica P.
Millson Jr. Henry E.
Szoke Ernest G.
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