Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1986-08-18
1988-08-02
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 57, 524310, 524318, C08L 500
Patent
active
047614420
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rust-inhibiting primer which possesses, on account of its novel composition and the method of its preparation, a high storage stability and outstanding application characteristics.
Antirust or rust-conversion agents containing synthetic resins or binders in solution or in emulsion as well as organic chelating agents, in particular tannins, are known. The development of such agents can be clearly followed from the patent literature.
Austrian Pat. No. 149,199, published on 10.04.1937, discloses an antirust agent which contains inter alia tannic acid solutions (tannin solutions) and other organic acids exclusively dissolved, or in solution, in admixture with resins that are soluble in organic solvents, particularly cellulose resins. No reference is made to aqueous emulsions, and the compositions as well as the method of preparation do not appear to be relevant to the invention.
English Pat. No. 826,564, published on 13.01.1960, discloses and claims protecting compositions for metal surfaces which contain acidic vegetable tannin extracts and latexes. Examples 1 and 2 of the said GB patent each describe a mixture consisting of one part by volume of 50% w/v of natural tannins and of the same part by volume of a plasticized polyvinyl acetate latex. Fuller details regarding the composition as well as the problems relating to preparation and storage or use have been omitted. The techno-chemical basis which has led to the English patent referred to, has been published in Journal of Oil and Colour, London, January 1958, pages 10 to 23. The preparation of antirust agents containing tannins and synthetic resin emulsions is represented in the paper more as an objective rather than as a concluded development. This agrees with the examples cited in the English patent which in practice are barely reproducible.
The development then turned more towards the application of solutions containing solely tannins. Examples of such solutions are given in Swiss Pat. No. 513,255, published on 15.11.1975. These rust-stabilizing agents are applied prior to the primer. Finally, Swiss Pat. No. 580,152 discloses and claims compositions comprising chelating agents and hence capable of rust conversion, containing a high proportion of synthetic resin binders.
However, the disclosed agents according to the foregoing Swiss patent leave much to be desired in respect of the storage stability as well as application characteristics and action, in particular as a primer. This is not surprising, given that the chemical problem of mixing an acid solution of a chelating agent with the normally alkaline emulsion of the binder has formerly been a difficult one to solve, for any product which is to be commercially and industrially viable, must possess adequate storage stability and be simple and effective to use. The agent would be most useful if it could find application directly as a primer.
All the mentioned technical improvements have been obtained by the novel compositions according to the present invention; even the applicant's experts could not foresee that the addition of the three key components, viz. silica powder, heteropolysaccharides and vegetable oil, all used on occasions individually in the coatings industry but not known combined in the stated proportions, will bring about such a result.
The rust-inhibiting primer composition according to the invention in the form of a highly stable emulsion is characterized in that it contains, besides solutions and emulsions of film-forming synthetic resins or binders, chelating agents, acid activators and others, up to 6% W--based on total weight--of silica powder, up to 1% W--based on total weight--of an anionic heteropolysaccharide and up to 10% W--based on total weight--of vegetable, air-drying oils and/or phthalate resins modified by such oils and also air-drying; the composition has a minimum water content in respect of storage stability and application characteristics.
The rust-inhibiting primer composition according to the invention can contain as binder both a highly
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Michl Paul R.
SFS Stadler Heerbrugg AG
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