Surface material suitable for writing or printing films or paper

 

Surface material suitable for writing and printing films, as well as paper obtained from water-soluble, partially azetilirovannah aliphatic (C1-C8) aldehyde polyvinyl alcohol with a degree of azetilirovanie less than 20 mol.% in terms of units of vinyl alcohol. The task is providing a surface material for films, which is able to applicious from pure water systems, on the film using traditional hydrophilic leads can get a good indelible image. 9 C.p. f-crystals, 1 Il.

The invention relates to surface material derived from partially azetilirovannah aliphatic aldehydes polyvinyl alcohol, suitable for writing or printing films or paper, in particular in the surface film for the upper projections (Overhead films) and films for laser printer and copy machines, as well as for coating on paper.

Surface film Overhead used in the projection technique, in the case where the transparent film Shine, the light after passing through the transparent film by means of lenses and mirrors razvorachivaecca, if reports in the demonstration of films, including in daylight.

Surface film Overhead are widely used in daily activities stationery office. Available usually on sale slicks Overhead the labels are made of special pencils that are either not washed or washed away. For this purpose, the film at least on one side are modified, for example, by coating polyvinyl alcohol.

The published description of the invention to unaccepted application Japan 4-216561 describes the use for this purpose a commercially available polyvinyl alcohol, partially acetaminophen aromatic aldehyde and which can be applied from a solvent mixture of water and isopropanol. According to the application Japan 4-216561 achieved for applications in engineering properties, such as the ability to write and clarity. The disadvantage of the above method is, however, that for the application of polyvinyl alcohol is required to have a solvent mixture of water and alcohol.

The present invention was to provide a surface material for films, which is able to applicious purely the e indelible image.

Unexpectedly it has been found that polyvinyl alcohols having a degree of azetilirovanie with aliphatic aldehyde-(C1-C8in terms of units of vinyl alcohol less than 20 mol.%, suitable for use in the surface layers to the top of the projections.

Thus, the object of the present invention is a surface material suitable for writing or printing films or paper derived from water-soluble, partially azetilirovannah aliphatic (C1-C8) aldehyde polyvinyl alcohol with a degree of azetilirovanie less than 20 mol.% in terms of units of vinyl alcohol.

Used according to the invention partially acetamidophenyl polyvinyl alcohol preferably has a degree of azetilirovanie from 1 to 15 mol.%, in particular from 5 to 12 mol.%, in terms of units of vinyl alcohol.

As the aldehyde component in the partially saponified polyvinyl-acetal built preferably aliphatic (C1-C8)-aldehyde, in particular With4-aldehyde. Suitable aldehydes are, for example, formaldehyde, acetaldehyde, n-propanal, isopropanol, Isobutyraldehyde, tert.-butanal, n-pentanal, n-hexanal, n-heptanal, n-octanal, 2-e is ery of saponification of from 70 to 100 mol. %, in particular 75-98 mol.%. The viscosity of a 4 wt.% solutions used polyvinyl alcohol in water at 20o(Heppler, norm DIN 53015) is preferably from 1 to 100 MPa/sec, in particular from 2 to 70 MPa/sec.

Partially acetamidophenyl polyvinyl alcohol according to the invention can be used in the form of a carrier film or in the form of a coating on the film carrier, respectively, on paper. The thickness of such layers on the film carrier is preferably from 0.1 to 100 μm, in particular from 1 to 10 microns.

Two necessary properties of good nanoselect inscriptions and good water resistance achieved two opposing definitions of material. If set too high azetilirovanie polyvinyl alcohol, you get good water resistance (long-lasting effect), but poor drying ink. If the degree of azetilirovanie is too low, then there is a very good Vassilievsky ink, but not good enough water or moisture. Therefore, the degree of azetilirovanie is set so that not only the resistance but also Vassilievsky ink are in relation to each other in a balanced ratio.

As should abandon IP the CA is dependent on the hydrophilicity used to azetilirovanie aldehyde, from the molecular weight of the used polyvinyl alcohol, and the degree of hydrolysis, but in any case it is less than 20 mol. % relative to the units of vinyl alcohol. The degree of azetilirovanie, which has a solubility depends upon the particular aldehyde mainly on the molecular weight of the original polyvinyl alcohol. The lower the molecular weight of the original polyvinyl alcohol, the higher may be the degree of azetilirovanie. Naturally, the higher the molecular weight of the original polyvinyl alcohol, the lower the achieved values of the degree of azetilirovanie in which the product is still soluble in water.

When the degree of azetilirovanie in the upper range between 15 and 20 mol.% in terms of units of vinyl alcohol, the solubility takes place even at room temperature. Very fast Vassilievsky is achieved in materials with a degree of azetilirovanie to 5 mol.% in terms of units of vinyl alcohol. In any case, nesminaemosti in General is insignificant at low degrees of azetilirovanie. When the degree of azetilirovanie equal to at least 5 mol.% in terms of units of vinyl alcohol, to maximalist drying is a particularly balanced. Getting partially azetilirovannah polyvinyl alcohols can be achieved by using freely present in the aquatic environment acid, or by using acid carrier, such as, for example, in the German application for the grant of a patent P 19617893.2. This method get has the advantage that the resulting solution of the product receives additional salt burden is not due to large quantities of alkali required to neutralize the used amount of acid. It brings clear advantages for thermal strength and transparency film. Salt can, in certain circumstances, adversely affect the transparency, other properties, such as adhesion of the coating on the film carrier. The removal of salt is usually possible with the help of dialysis. However, this method is costly and is associated with high costs.

After the solution obtained and neutralized, it can directly be applied. When long term storage it is preferable to conserve.

The solution is partially azetilirovannah polyvinyl alcohol may be added to the freely supporting films or printed on the film carrier. As appropriate materials for films-cnie film materials, for example, polyethylene terephthalate (PET), polypropylene (PP), polyvinyl chloride (PVC), polymethylmethacrylate (emission spectra obtained for pure), polycarbonate (PC).

The application of these films-carriers by using the material according to the invention can also be carried out in accordance with known methods. For example, suitable for this are the so-called ways of the wiper or squeegee.

The obtained surface materials differ in that they can easily apply labels traditional "hydrophilic" commercial pencils or laser printing devices and photocopy machines, and that the printed labels are bad erasable.

EXAMPLE 1. Getting partially azetilirovannah polyvinyl alcohol To 15 wt.% the solution of polyvinyl alcohol, typeThe moviola 4-98 (Hoechst AG, the degree of hydrolysis of 98 1-%) was added to 98.6 grams of Butyraldehyde (99%) and at room temperature was stirred. Then for 60 min was added 253 ml of 20 wt.%-Noah hydrochloric acid. Then for 120 minutes was heated to 30oAnd with 10% aqueous sodium hydroxide solution was set to pH 7-8. Removal of dissolved salts from a solution of the product produced is toulali at 20oWith 4 wt.%-aqueous solution to 4.68 MPa/sec. The degree of azetilirovanie was 12 mol.% in terms of units of vinyl alcohol.

EXAMPLE 2. Getting partially azetilirovannah polyvinyl alcohol To 15 weight. % solution of polyvinyl alcohol Moviola 10-98 added 68.9 grams of Butyraldehyde (98,8%) and, in accordance with the application Germany 19617893.2 at a temperature of 7oIt was introduced in the exchange reaction with bearing acids, which catalyzed the reaction azetilirovanie, but were not dissolved in the water environment. Then with aqueous sodium hydroxide solution, the reaction solution was adjusted at pH values equal to 7-8. The viscosity, measured according to the norm DIN 53015 (viscometer with a falling ball Heppler) was at 20oWith 4 weight. % aqueous solution 9,98 MPa/sec, and 8 wt.% aqueous solution to 71.5 MPa/sec. The degree of azetilirovanie was 8 mol.% in terms of units of vinyl alcohol.

Examine the selected products using a differential scanning calorimeter (in accordance with the norm DIN 53765) clearly show how the glass transition temperature (TD) increases with the degree of azetilirovanie compared to the original polyvinyl alcohol. The dependence presented at the new azetilirovanie, equal to 12 mol.%, and a solids content of 15 wt.% by using a doctor blade was applied on a polyethylene terephthalate film with a thickness of 100 μm. Then the film was dried at 100oWith 2 minutes. The resulting after drying the layer on the polyethylene terephthalate film had a thickness of 2 to 5 μm. On the thus obtained composite material using a conventional commercially available ballpoint pen (Ball pen), for example, using a stylus branduniball micro (firm Faber-Castell GmbH), applied the decal. The ink dried on the film within a short period of time, after which they cannot be erased by hand. The projection using a conventional Overhead projector inscription on the screen was clear and clearly readable.

Claims

1. Surface material suitable for writing or printing films or paper derived from water-soluble, partially azetilirovannah aliphatic (C1-C8) aldehyde polyvinyl alcohol with a degree of azetilirovanie less than 20 mol.% in terms of units of vinyl alcohol.

2. Surface material under item 1, characterized in that the polyvinyl alcohol with a degree of acetaminophan, is then obtained from polyvinyl alcohol, partially azetilirovannah aliphatic (C1-C6) aldehyde.

4. Surface material under item 1, characterized in that the polyvinyl alcohol, partially azetilirovannah n-Butyraldehyde.

5. Surface material under item 1, characterized in that the partial azetilirovanie used polyvinyl alcohol with a degree of saponification of from 70 to 100 mol.%.

6. Surface material under item 1, characterized in that the polyvinyl alcohol is characterized by a viscosity Heppler 4 wt.% solutions in water at 20oWith from 1 to 100 MPaC.

7. Surface material under item 1, characterized in that the partially acetamidophenyl polyvinyl alcohol is in the form of free carrier film.

8. Surface material under item 1, characterized in that the partially acetamidophenyl polyvinyl alcohol is in the form of a coating thickness of from 0.1 to 100 μm on the film carrier.

9. Surface material under item 1, wherein the film carrier is selected from the group of polyethylene terephthalate, polypropylene, polyvinyl chloride, polymethylmethacrylate and polycarbonate.

10. Surface material under item 1, characterized in that the film is surface is

 

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