Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1987-04-23
1988-12-06
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524381, C08K 505
Patent
active
047897015
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of and means for modifying rubber and plastics or other materials, particularly elastomeric materials, by use of polymers formed between metal oxides and glycerol at relatively high temperatures and which generally exhibit a greater two dimensional extension in one plane than in the extension in a plane normal thereto, and in particular it relates to the use of the high temperature compound formed between zinc oxide and glycerol which we have named "glyzinc" which was the subject of our earlier United Kingdom Pat. No. 2101132B which related to the use of a glycerato-zinc complex (C.sub.3 H.sub.6 O.sub.3 Zn) arranged and used as a pharmaceutical compound.
The glycerato-zinc complex produced according to our method produces platelets extending substantially in two directions in one plane and having low extension in a plane normal thereto which platelets can be grown to selected extensions in the one plane but retain a relatively low extension in the other plane and of a characteristic hexagonal form which have a high lubricity and can be aligned to lie in a selected plane.
During further research it has been found that the glycerato-zinc complex can be used beneficially in the production of plastics and rubber and particularly in elastomeric materials, and the object of the present invention is to provide certain improvements to such materials.
The use of zinc oxide in rubber is already well known and has been used since the early days of rubber compounding, the zinc additives principal function being to serve as a vulcanizing activator. It was generally known also that the rubber was improved by use of zinc oxide during the processing.
Reference may be had to U.S. Pat. No. 3,859,236 Charles Blewett et al which refers to the stabilization of Vinylchloride homopolymer and copolymers with very small percentages of zinc glyceroxide having the formula C.sub.3 H.sub.5 O.sub.3 M.sub.e where M.sub.3 is the bivalent metal which constituted 40 to 50 percent by weight of their compound. There is no evidence that this produces or exhibits the controllable platelets of the present invention as defined in the above United Kingdom Patent, and is acknowledged as having a different formula. The Blewett substance appears to have been used merely as a substitute for zinc oxide and appears to contain free zinc oxide and be used for a different purpose.
In the British Patent referred to eariler herein it was shown that in addition to zinc oxide, any zinc compound, either soluble or insoluble in glycerol, which decomposes to zinc oxide on heating to a temperature below the boiling point of glycerol will on being subjected to continued heating in glycerol forms the glycerato-zinc polymer which is of two-dimensional extension and can be grown to have crystals of varying extensions in those directions. Thus it is possible by selective preparation to have relatively large thin crystals of `glyzinc`, or to have small crystals, or an admixture of these. Generally the larger platelike crystals exhibit an hexagonal morphology.
Basically the preparation of the material comprises mixing zinc oxide, or a zinc oxide forming material, with glycerol in the proportion of about fifty parts weight of zinc oxide, or zinc oxide forming material to an excess say 500 parts by weight of glycerol, raising the temperature of the mixture to about 260 degrees C. and maitaining the temperature with constant stirring until the action is complete, then coolig and pouring the mixture so formed into water, filtering, washing and drying to isolate the glycerato-zinc so formed. The reaction will proceed at lower temperatures more slowly.
During research it has been found that the platelets so formed can be incorporated in rubber as a substitute for zinc oxide whose function has herein been described or in plastic material and form an advantageous linkage in the final material the properties of which can be varied according to the method of processing. For instance the platelets of the compound can be arranged in the plastic or
REFERENCES:
patent: 2310449 (1943-02-01), Lightbown et al.
patent: 3859236 (1975-01-01), Blewett et al.
patent: 4090773 (1978-05-01), Baue
Radolovich et al., Aust. J. Chem. 23 1967-71 (1970).
Hambley et al.-Aust. J. Chem. 36 1249-53 (1983).
CA 99:131605t (1983).
CA 101:192737u (1984).
Glyzinic Pharmaceuticals Limited
Hoke Veronica P.
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