Cleaning and liquid contact with solids – Processes – Including forming a solidified or hardened coating for cleaning
Patent
1990-01-16
1991-05-21
Pal, Asok
Cleaning and liquid contact with solids
Processes
Including forming a solidified or hardened coating for cleaning
427154, 427155, 427156, 427415, 435101, 435104, B08B 700
Patent
active
050172379
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for facilitating removal of undesired contamination from a surface. In brief, the invention resides in the concept of protecting a clean surface by a polysaccharide film which, after contamination thereof, can be partly or completely removed by treatment with a suitable solvent for the polysaccharide in question.
Many surfaces exposed to the environment are continuously being contaminated by undesired deposits, such as soot, grease, dust, traffic pollution etc. Furthermore, accidental stains can be made on items, such as table cloths, carpets, clothes etc. Some types of stains can be extremely difficult or even impossible to remove. Over the last years deliberate scrawling on walls or other structures has become an increasing problem and has its origin in so called "graffiti". In paint factories, printing works and lacquering industries cleaning of containers, equipment etc. is associated with difficulties and quite generally requires strong alkaline solutions or organic solvents which cause health hazards and environmental inconvenience. Masking procedures in lacquering work are difficult to perform on curved or irregular surfaces.
The present invention has for an object to provide new techniques by which the above-indicated problems can be circumvented or at least greatly reduced.
Another object of the invention is to provide for a methodology which does not involve health hazards or other environmental inconvenience.
These and other objects of the invention which will be clear from the following are obtained by first covering the clean surface to be treated with a polysaccharide film which is capable of redissolving or swelling when contacted by a liquid comprising a solvent for said polysaccharide. The polysaccharide film thus applied to the surface involved will protect said surface from direct contamination. When contaminated undesired contamination can be easily removed from the surface by treating the contaminated surface with a liquid which is capable of redissolving the film or providing for swelling thereof, whereafter the undesired contamination can be removed by removing at least the dissolved or swelled surface layer of the film. Such removal can be obtained by any suitable technique, such as spraying, brushing, wiping, rubbing, washing or the like.
Thus, the invention provides for a process for facilitating the removal of undesired contamination from a surface, comprising the following steps: onto said surface before it is subjected to contamination, said polysaccharide being capable of forming a redissolvable or swelling solid film upon drying; surface; film or providing for swelling thereof; and swelled surface layer of the film.
According to an alternative procedure the facilitated removal of such undesired contamination from a surface may comprise the steps: is capable of redissolving or swelling when contacted by a liquid comprising a solvent for said polysaccharide; film or providing for swelling thereof; and swelled surface layer of the film.
In this alternative procedure there is thus used a preformed polysaccharide film having the desired properties in regard to being capable of redissolving or swelling when treated with a suitable solvent for the polysaccharide.
With regard to the polysaccharide solution used in the process of the invention it is preferred to use an aqueous solution. Thus, a water-soluble polysaccharide is preferred to use in such solution. By the term "water-soluble polysaccharide" there is meant polysaccharide which is soluble in water in a liquid state.
In order that the polysaccharide used shall perform in a satisfactory manner it shall be capable of forming, when a solution thereof is applied to a surface, a film which is reversably dissolvable or which has the ability to swell when contacted with a solvent for the polysaccharide.
Films of the polysaccharide can be produced by solvent evaporation, wet casting or molding. Polysaccharide films can exist as supported or unsupported films. Supported films do not possess s
REFERENCES:
patent: 2811456 (1957-10-01), Coleman
patent: 2877131 (1959-03-01), Overholt et al.
patent: 4465619 (1984-08-01), Boskamp
patent: 4483782 (1984-11-01), Cox et al.
Bioboat AB
Pal Asok
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