SU793817A1 - Material for correcting typed text - Google Patents

Description

Refers to a corrective material for correcting erroneous characters when typed. Known corrective material for painting, consisting of a base paper and a coating containing white pigment, a binder, a copolymer of vinyl chloroform and vinyl acetate, and aluminum or bronze powder (1. This material (works by clogging. When struck with a typewriter from the reverse side of the corrective of the material related to the coating, the latter covers the wrong sign. Then, by subsequent strokes, a new sign is applied. However, this material has an increased markup. The closest analogue of the described invention is a material, - the correcting coating of which contains white pigment, titanium dioxide and aluminum silicate, a binder polyethylene, polyvinyl chloride and a surfactant - natural or artificial resins Diomeen TDO (alkyl substituted dioleate trime, ethyl aluminate) resins with Lbietin acid) 2. However, the composition of the corrective coating in the case of use does not provide sufficient hiding power for the erroneous sign and subsequent perception of the new sign. In addition, it contains scarce and expensive chemicals such as Diomeen TDO and Albertate aluminum. The purpose of the present invention is to increase the hiding power of the erroneous sign and the subsequent perception of the new sign of Lree Typewriting using domestic ribbons. This goal is achieved by the fact that, in a correction material for painting, consisting of a paper or film substrate and a coating containing white pigment based on titanium dioxide, a polymeric binder, a surfactant and a plasticizer, according to the invention, the coating contains polyvinyl butyral as a polymeric binder, and as a surface-active substance, Greg-Butyl-substituted phenol-formaldehyde resin in the following ratio of the indicated ingredients of the composition, wt. %: White pigment 90.0-98.0 Polyvinyl1, 3-3.0 butyral

Greg-Butylphenol formaldehyde resin 0.4-1.0

Plasticizer 0.3-6.0

The coating is mixed with an organic solvent with a dry matter content of 30-55% with the subsequent removal of the solvent at a temperature of 25-65 °.

As a white pigment, titanium dioxide pigment, rutile form is proposed. Anatase titanium dioxide can be used, however, the dispersion time is 2-3 times as long as yBie. To titanium dowox up to May 30 % talc, cables, H, barium sulphate, calcium carbonate, silica and other known white pigments can be added.

Polyvi n.bulbuT | Irail suggests using lacquer, grades LA or LB according to GOST 9439-73.

Alkyl esters of high molecular weight fatty acids, alkyl esters of orthophthalic acid, aryl esters can be used as plasticizers.

phosphoric esters, polyglycols. Polyvinyl butyral can be pre-plasticized.

Tuoet-Butylphenol-formaldehyde resin is produced according to TU 24-169.

Other synthetic resins, such as LBS-1 lacquer, E-12 resin, and M-30 resin, were also tested as surface-active agents, but they failed to produce positive results.

Alcohols, ethers, chlorinated and aromatic hydrocarbons, commonly used in the paint industry, or mixtures thereof can be used as a volatile solvent. The ratio of solids to solvent PEC0 is recommended to be selected so that the viscosity of the obtained VZ-4 suspension and VO-4 is 10-30 s, and the application value is 116-50 g / m.

Paper and synthetic film can be used as the basis.

Example 1. In a laboratory ball mill, the composition of the proposed corrective coating (A), shown in Table 2, is prepared. one.

Note. 1. C. resin F-60 - trbg-Butmlphenolform.aldegidna cmola. Scola M-80 is a pentaerythritol ester of maleiposic capnfol. C.mole E-12 - irol.ukt condensation of abietinovka acid with fegulformaldehyde resin.

2. Luck LBS-1. Alcoholic lacquer based on phenol-formaldehyde l: yu resin.

3. The consumption is given but dry matter.

150 g of alcohol is introduced with greg-butylphenol-formaldehyde resin (F-60), polyvinyl butyr and dibutyl phthalate and mixed until complete dissolution. To the resulting solution, titanium dioxide is added and dispersed over 12 hours. The dispersion viscosity (in OT-4) is 18 s. The resulting dispersion is applied on a doctor blade to paper-based. The solvent is removed by evaporation.

The resulting correction material was tested on a domestic Yatron electromechanical typewriter with H-font. The results of material tests are given in table. 2

In a similar way, the formulations of the corrective coating of the prototype, shown in Table 1 (B, C, D), are prepared and applied to the base paper.

Example 2. A lavsan film and an corrective coating prepared as described in example 1 of composition A, G: titanium dioxide. PO-2-90, barium sulfate -.8, Polyvinyl butyral grade LA-

1.3, resin F-60 - 0.4, butyl stearate - 0.3, alcohol-115, toluene-115. Viscosity of dispersion 10 g according to VZ-4. Upon removal of the solvent, a correction material with a nanoscale coating of 16 g / m is obtained.

Technical

Instead of barium sulphate, silicon dioxide, calcium carbonate, kaolin can be used. The test results of the corrective material are presented in table. 2

table 2

Example

Claims (1)

Claim A correction material for typewriting, consisting of a paper or film substrate and a coating containing a white pigment based on titanium dioxide, a polymer binder, a plasticizer and a surfactant, characterized in that, in order to increase the concealment of the erroneous sign and the subsequent perception of a new sign, the coating contains polyvinyl butyral as a polymer binder, and tert-butylphenol formaldehyde resin as a surfactant in the following ratio of these ingredients with Tava, May. %: White pigment 90.0-98.0 Polyvinyl butyral 1.3-3.0 T per-Butylphenol formaldehyde resin 0.4-1.0 Plasticizer 0.3-6.0