Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Reexamination Certificate
1998-07-02
2001-06-12
Green, Anthony (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
C106S724000, C106S737000, C106S819000, C106S823000, C524S002000
Reexamination Certificate
active
06245143
ABSTRACT:
DESCRIPTION
This invention covers a technical innovation in the composition, processing and application of a low thickness hydraulic mortar, with regenerating properties when used on cement, cement concrete and composite material structures. The various properties of the subject mortar make it possible to utilise it in a wide range of circumstances and in many sectors of industry and building, and hydraulic works.
Therefore the present invention relates to the engineering field, particularly to cement and concrete cement buildings and piping works, more particularly to those materials such as coatings and mortars used to confer on cement and concrete endurance properties towards weathering and other chemical and physical agents that tend to substantially deteriorate the building materials with time.
Generally, the employment of fine grained materials which are easily applied is recommended. These generally include coatings and mortars in the form of conglomerates with clasts of ever smaller size. The constraints placed on the ease of applicability of such materials are determined by the size of the particulate matter that is present in them, besides its percentage of the overall volume or weight.
The strive is towards the attainment of formulations capable of forming thinner and thinner layers so that they can fill tiny cracks and crevices that allow materials to be deteriorated faster, and mat structures in such a way as to guarantee a consistent and remarkable protection to the surfaces to which they are applied.
There are known to exist several types of coatings and mortars in the prior art but inherent in them and in the processes for their production there are found to be several inconveniences and flaws.
In EP 0 455 940 there is disclosed a fine mixture particularly recommended for filling small cracks and crevices present in stone building materials, that comprises among its ingredients fine cement, quartz powder, water and polyethylene oxide, and a process for the production thereof. In the mixture quartz particles have an average size of less than 40 mm. The process is rather cumbersome as it involves letting the polymer be embued with water for 24 hours, and two mixing cycles, a high speed and a low speed one, thanks to which two mixtures are obtained and mixed together.
In EP 0 182 543 a very effective coating material for buildings is disclosed, though serious constraints are placed on it by the fact that it is mostly made up of a polymeric material to be obtained by polymerization reactions which are inherently rather lengthy.
In JP 55 007 309 there is found to be disclosed a coating material with marked waterproofing properties. The application of said coating material is heavily penalised by the the fact that it must involve two phases.
In JP 58 029 970 there is disclosed a cement mortar composition which comprises among its components a vinyl acetate resin. Although quick drying and mainly suitable for local applications, it must undergo polishing and cleaning treatments before utilization, decreasing its suitability for coating pipes and drinking water tanks.
A major shortcoming of all the products and processes of the prior art is that the application is time consuming and expensive and the attainment of the materials is cumbersome and elaborated.
Therefore aim of the present invention is to propose a coating material, more particularly a mortar, whose nature is similar to that of the cement and concrete used in buildings, which is easy to apply by means of an airless pump, thus ensuring rapid and economical application with respect to traditional systems. The mortar, applied as described, makes it possibile to obtain a coating of low thickness and which is compact and thus has excellent waterprrofing, adhesive and physical and chemical resistance properties.
The above aim has been accomplished thanks to a cementitious material to be applied onto building materials comprising cement and concrete, and pipes, as a coating or a mortar with regenerating and protective properties towards said materials, characterised by the fact that it comprises a component A consisting of equal ±20% volumetric amounts of cement and quartz sand, and a component B consisting of a resin emulsion obtained by admixture of equal amounts ±20% of synthetic resin and water, said cementitious material further comprising additives.
These and other features will be more readily apparent from the following description of a preferred not limiting embodiment of the invention.
Among its components, the coating, more specifically the mortar, object of the present invention comprises fine quartz powder, a synthetic resin emulsion, emulsified additives and water.
The fine quartz powder is never any bigger than 200 micrometer diameter.
Cement aggregate and emulsion are present in equal amounts plus or minus 20%, while cement aggregate and synthetic emulsion are present in a 1 to 0.3-0.5 volumetric proportion plus or minus 20%.
The mixture object of the present invention is obtained by a process which comprises a first phase wherein cement and quartz sand are dry mixed together; a second phase wherein the cement aggregate obtained is admixed with the synthetic resin emulsion previously obtained by admixture of a synthetic resin with water, and additives, until a homogeneous mixture is obtained; a third stage wherein the mixture is transferred to a low angular speed agitator from which it can be readily employed on a continuous basis, until it has been used up.
The coating, more particularly the mortar, is suitable to be applied with an airless pump, preferably of the diaphragm type with a 115 &mgr;m (45 micro inches) nozzle, equipped with an intake filter and modified valves if required.
REFERENCES:
patent: 0182543 (1986-05-01), None
patent: 455940 (1994-09-01), None
WPIDS Abstract No. 80-15390C, abstract of Japanese Patent Specification No. 55-007309. (Jan. 1980).*
WPIDS Abstract No. 83-31215K, abstract of Japanese Patent Specification No. 58-029970. (Feb. 1983).*
WPIDS Abstract No. 83-53026K, abstract of Japanese Patent Specification No. 58-069272. (Apr. 1983).*
WPIDS Abstract No. 84-053776, abstract of Japanese Patent Specification No. 59-013685. (Jan. 1984).*
WPIDS Abstract No. 90-212034, abstract of Japanese Patent Specification No.02-140700. (May 1990).*
WPIDS Abstract No. 90-221845, abstract of Japanese Patent Specification No. 02-151797. (Jun. 1990).*
WPIDS Abstract No. 96-283673, abstract of Japanese Patent Specification No. 08-120192. (May. 1996).
Green Anthony
Stevens Davis Miller & Mosher LLP
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