RU2036112C1 - Reusable writing paper material and polymer-based composition for cleaning this material - Google Patents

Abstract

FIELD: drawing and office accessories. SUBSTANCE: polystyrene sheet with the thickness of 0.8-1.5 mm of opal, white, light-green, light-pink, light-blue color with matted surface is used as reusable writing paper material for writing by pencil. Composition used for removal of pencil inscriptions from writing paper material consists, % by weight:polymethylmethacrylate - 1.23%, glycerine - 8.20%, potash alums - 0.16%, ethyl alcohol - 8,20%, perfumery odorant 0.0082%, distilled water the balance. Writing paper material is characterized in that it allows about 20000 inscriptions to be made and rubbed-off without visible deterioration of contrast between written material and basic material. As a result consumption of paper for pupil's, student's, office and like inscriptions is reduced by 7000 times and usage of power resources and wood is considerably decreased. Material- base and cleaning composition-are non-toxic, satisfy strict hygiene requirements, may be used many times, and is manufactured from chemical industry wastes. EFFECT: increased efficiency by reduced usage of paper, power and wood, increased economy by manufacturing this material from wastes and decreased contamination of environment by using non-toxic materials. 3 cl

Description

 The invention relates to the production of writing accessories, in particular writing material for repeated use in exchange for paper, and to the chemical industry, in particular to means for cleaning polymer surfaces from various inscriptions.

 In modern writing technique, paper is widely used as the basis material. In everyday life (among writers, engineers, business people, pupils and students, office workers), it is often necessary to make small operational notes, various kinds of memos, lists, etc. what are usually used notebooks, sheets, torn from a gummed pile of paper, which are then discarded as they no longer need.

 In these cases, as in many others, the use of paper becomes irrational and environmentally disadvantageous, since now paper is becoming an increasingly energy-intensive and expensive material.

 The rapid progress in the technology of electromagnetic recording of a human furnace has allowed the release of electronic notebooks that can partially remove the problem of paper shortages. The wide distribution of such products is hindered by the relatively high price of them.

 On the other hand, attempts are being made to adapt traditional writing material to paper for producing multiple recordings on it, for example, synthetic paper based on polyethylene terephthalate, styrene and other polymeric materials used for writing with pencil, ballpoint pen and felt-tip pen in cartography, drawing technique, and pattern making . It is known that multiple pencil writing on synthetic paper, followed by erasing, allows 7-10 recording cycles in the same place without apparent deterioration in contrast (when erasing is written with a plastic or rubber-like eraser).

 In particular, it is known to use polystyrene in various colors of white, opal, light green, light pink, light blue, and also with a frosted surface of various thicknesses (10-100 μm) as a structural material for parts that do not experience large mechanical loads, for the manufacture of consumer goods (various utensils, mainly imitating crystal, cases of fountain pens, various decorative products).

 The purpose of the invention is the creation of a synthetic paper substitute, expanding the range, cheapening, reducing toxicity, improving the environment.

 Various chemical agents are known for removing labels from various surfaces of a coating (metal, paper, plastic) with ink, pencil based on organic solvents with the addition of thickeners, emulsifiers and other target additives.

 Basically, such compositions due to the high content of organic solvents in them are quite toxic and fire hazard.

 The closest in technical essence to the proposed invention is a composition (composition) for removing pencil images from varnish and bumified coating of synthetic films, including perchlorethylene, ethyl alcohol and water.

 However, the known composition due to the presence of a chlorine-containing solvent in it is also among the toxic substances.

 An object of the invention is the replacement of expensive paper with synthetic material, expanding the range of writing instruments and improving the environment.

 To solve this problem, sheet polystyrene with a thickness of 0.8-1.5 mm of opal, white, light green, light pink, light blue with a matte surface is used as reusable writing material when writing in pencil.

 Another technical challenge is to reduce the toxicity and fire hazard of the composition.

 This technical problem is solved due to the fact that the composition for cleaning reusable written material on a polymer basis, including ethyl alcohol and distilled water, additionally contains polymethyl methacrylate, glycerin, alum-potassium alum and perfume perfume in the following ratio of components, wt.

Polymethylmethacrylate 1.23
Glycerin 8.20 Alum potassium alum 0.16
Perfumery fragrance 0,0082
Ethyl alcohol 8.20
Distilled water
The use of high-impact polystyrene as writing material allows you to apply a very large number of inscriptions in pencil (up to 20,000), while cleaning the surface of the sheets is carried out not with erasers, but with pillows, rollers and other devices impregnated with the proposed polymer composition.

 Thus, the materials listed above can serve as the basis (substrate) for repeated writing in pencil. In this case, it is convenient to produce sheets with a thickness of 0.8-1.5 mm in the form of cards of various sizes with rounded edges and corners (synthetic half-cardboard and cardboard).

 The polymer cleaning composition allows the erase operation to be written quickly and with a high degree of restoration of the original contrast. It has a strong absorptive capacity with respect to the particles of the fat-graphite-kaolin mixture of the stylus of the pencil and regenerates the ability of the polystyrene surface to perceive a new inscription without slipping the writing instrument for 1-3 s.

 The following substances known in the industry are used as perfumes in the composition: lavender, rosemary, rose oils, citronellol (a group of essential oils), myrrh, frankincense, styrax (a group of resins), benzaldehyde (a group of synthetic aromatic substances).

 Structurally, polystyrene as a material, the basis for repeated writing with a pencil can be made either in the form of a rectangular sheet from 40x60 mm in size (credit card format, convenient for a wallet, jacket pocket, trousers) to 250x360 mm (for artists' sketches, shorthand, literacy for children 4-6 years) with rounded edges, or in the form of sheets of writing paper A3 and A4, inserted into transparent plastic envelopes or fastened in one way or another to a notebook or foot.

The manufacture of the cleansing composition is extremely simple. In distilled water at 40-50 ^{° C} was dissolved polymethyl methacrylate (e.g., hostatserin German company HOECHST). After the process of rapid swelling is completed, glycerin, ethyl alcohol, alum-potassium alum, perfume fragrance are added to the prepared mass and everything is thoroughly mixed. The resulting composition is non-toxic and meets the most stringent hygiene requirements, because when it is impregnated with pillows, rollers and the like from cotton, polyester, viscose wool, foam rubber, felt, fabric, and in the process of cleaning the surface of polystyrene from a pencil, there is direct contact with the skin of the hands.

The polymer cleaning composition prepared by the above method has the following composition (wt.):
Polymethylmethacrylate 1.23
Glycerin 8.2
Ethyl alcohol 8.2
Alum potassium 0.16
Perfumery fragrance 0,0082
Distilled water
For impregnation of cleaning devices, the composition can be used 2-3 hours after preparation. Contact with the skin of the hands of the cleaning composition does not cause any irritation, since the emulsifying and astringent actions of polymethylmethacrylate and alum-potassium alum, respectively, contribute to the formation of a polymer film on the skin surface, which is easily removed during subsequent hand washing. The cleaning composition can be packaged in tubes, cans, bottles. A tampon, roller or pillow, impregnated with the proposed composition, is washed off with a pencil without visible deterioration of contrast up to 15,000-20000 times, which will ensure the introduction of writing material and composition for cleaning it in everyday school, student, stenographic and office practice, will reduce paper consumption by 7000 -8000 times.

Claims (2)

 1. The use of sheet polystyrene with a thickness of 0.8-1.5 mm opal, white, light green, light pink, light blue with a matte surface as writing material for repeated use in writing with pencil.  2. Composition for cleaning reusable written material on a polymer basis, including ethyl alcohol and distilled water, characterized in that it further comprises polymethyl methacrylate, glycerin, alum potassium alum and perfume fragrance in the following ratio of components, wt. Polymethylmethacrylate 1.23
Glycerin 8.20
Alum potassium 0.16
Perfumery fragrance 0,0082
Ethyl alcohol 8.20
Distilled water