Compositions: coating or plastic – Coating or plastic compositions – Proteinaceous material containing
Patent
1998-03-30
1999-10-26
Brunsman, David
Compositions: coating or plastic
Coating or plastic compositions
Proteinaceous material containing
1061341, 1061342, 1061451, 1061521, 1061572, 1061576, 1061577, 10615771, 1061578, 1061581, C09D 712, C09D18900
Patent
active
059720930
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a paint and use thereof In particular, the present invention relates to a wall paint, in the liquid or semi-liquid state, which can be used advantageously in the building sector for the decoration and/or restoration of masonry works to which the following description refers, without thereby losing its general character.
In the sector of activity relating to the preparation of paints it is known to use product formulations which essentially comprise three groups of main components referred to respectively as: pigments, fillers and binders; to which numerous other secondary components are added, such as wetting, dispersing and suspending agents, anti-blister agents, adjuvants, coalescents, bactericides, conservation agents, etc.
The most important of the groups of main components is without doubt the group of binders, which alone may determine the main characteristics of a certain paint.
BACKGROUND ART
In the currently produced paints, the binders consist of synthetic polymer resins with extremely long and complex molecules. The polymerisation time of a normal synthetic resin and hence of the film of paint is about 3 weeks. During this period, solvents, bactericides and surfactants which are extremely dangerous for human health and which, in particular in water-based paints--being odourless--manage to produce the most harmful effect, are released into the atmosphere. The gravity of this state of affairs is confirmed by modern medical science which is now universally in agreement in attributing to paints in general, and to drying agents in particular, many of the causes of serious pathological conditions. Of these, different types of tumour, acute allergies, asma, bone disorders, etc., are so recurrent among manufacturers and users of these paints that they are now regarded as professional illnesses true and proper within the sector.
Another disadvantage of these resins consists in the fact that the film formed after drying, although resistant and elastic, with time tends to deteriorate, showing signs of cracking, peeling and crumbling which ruin the aesthetic appearance, adversely affecting the supporting materials and producing dangerous dusts which are inhaled by the occupants of the environment.
The second group of components consists, as mentioned, of pigments. At present the pigments used are of the artificial inorganic type and consist of iron and zinc oxides, and titanium dioxides or organic pigments derived from oil.
All these substances have the disadvantage that they represent a source of environmental pollution.
The third group, finally, consists of fillers, the choice and dosing of which significantly influences the amalgam between binders and pigments, thus also making the paint more resistant, if carefully chosen and suitably dosed.
The most important components of the fillers currently used are natural substances such as (amorphous and crystalline) calcium carbonate, calcites, talcs, gypsum, sand, quarzites, etc. However, nowadays the tendancy to use artificial fillers comprising powders which are coated, calcites, talcs, gypsum, sand, quarzites, etc. However, nowadays the tendancy to use artificial fillers comprising powders which are coated, precipitated or have a completely synthetic structure is becoming increasingly widespread.
Finally, as regards the secondary components, in this case also, the tendancy to use toxic synthetic chemical additives has now become widespread.
A paint composition of the type described in prior art portion of claim 1 (WPI Dervent 81-79092D[43] & SU-A-800154) is known in which the paint comprises in combination: earth; flour; borax, kalinite, calcite, kaolin, slaked lime, mica and talc, sea salt and boron salts;
With a paint of this kind considerable drawbacks are caused by using of drying oil. The casein implies an acid environment, this favours bacteria proliferation and chemical reaction with calcium carbonate, which further causes color alterations. Therefore, to avoid these problems the paint needs an hig
REFERENCES:
patent: 2880104 (1959-03-01), Scholl
patent: 5312481 (1994-05-01), Greiner
Bernacchia, Ida
Brunsman David
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