SU806470A1 - Method of making registration material - Google Patents

Description

one . . This invention relates to the manufacture of a pressure-sensitive recording material (self-copying or carbon-free carbon copy paper). There is a method l for obtaining a recording material by combining two sheets of paper, on the surface of one of which a pressure sensitive layer is applied from a dispersion of microcapsules containing in the core a color-forming substance in a mixture of organic solvents t of polyisopropylphenyl, monoisopropyldiphenyl, non-alkylated diphenyl at the following ratios, wt. %; Monoisopropylphenyls (pre-lvIvitIs poured and VX-isomers) because of the 30% polyisopropyldiphenyls of people who are not a part of the rest of the world. which causes great harm to the recording material and gives it an unpleasant smell. The purpose of the invention is to increase the intensity of staining and the definition of registration. This goal is achieved by using microcapsules containing polyisopropyldiphenyl and monoisopropyldiphenyl in addition to benzyl benzoate in a known method for producing recording material and additionally benzyl benzoate in the following ratio of 55-65: 10-30: 15-25, respectively. The content of a harmful substance-- non-alkylated diphenyl is excluded or allowed to not more than 1% of the total weight of solvents. In addition, the mixture does not have an unpleasant odor, has low toxicity due to the low content of diphenyl in its composition, dissolves color-forming substances well and transfers them well to the acceptor side of paper. According to the method, a solution of color-forming substances in a complex mixture of solvents is microencapsulated by the method of complex coacervation in a gelatinoglufli-arabic shell. The aqueous dispersion of microcapsules is mixed with a filler (kaolin, cellulose flakes, wheat starch, etc.), as well as with a solution of binders such as starch, polyvinyl back or carboxymethylcellulose and applied | As a uniform donor coating on the lower side of the paper sheet (substrate ), - The upper side of another paper sheet is coated with an acidic material (acceptor coating), which includes, for example, kaolin, modified aerosil, synthetic latex. Both sheets are used in a set, and a sheet of paper with a donor coating is placed above the sheet with an acceptor in such a way that the donor side of the top sheet coincides with the acceptor side of the bottom sheet. In order to increase the number of copies, double-coated stitching sheets can be placed between the upper bottom sheets - the acceptor from the upper side and the bottom from the lower side. Sets of such pressure sensitive recording material are used to make copies of the text without using plain (carbon) carbon paper. When writing with a pen or pencil, when typing on a typewriter or in computer installations, the microcapsule shells are destroyed and the solution of color-forming substances in an organic solvent enclosed in them flows out of the microcapsules and interacts with the acidic material of the acceptor coating. As a result of this interaction, a colored text print appears on the acceptor side of the sheet. Example. To 53 parts of a 10% photographic gelatin solution (a cisoelectric point at pH 4.9, 21 parts of a 1% aqueous solution of disodium salt of vinylmethyl ether with maleic anhydride (IME / MA) are added) and the pH value of the mixture is adjusted to to 9 by adding 20% sodium hydroxide solution. Separately dissolved with stirring and heated to SO-SOO C 0.6 each. Part of two color-forming substances of crystalline violet lactone and benzoyl-lomethylene blue blue in 44 parts of organic solvent, which is a complex nzopro mix ildifenilov and benzyl benzoate, the composition given in the table.

Monoisopropyl biphenyls

(t and p isomers)

Polyisopropyl diphenyls, including diproducts and ganic impurities.

Diphenyl

Benzyl benzoate A solution of color-forming substances is added to an alkaline solution of gelatin and a VME / MA copolymer and the mixture is emulsified at 55 ° C using a turbine-type agitator. Emulsification is completed when the size of the oil phase drops is 3-5 µm. With stirring, 38.3 parts of a 10% aqueous solution of gum arabic are added to the emulsion and the mass is diluted with 113 parts heated to 55 ° C de-ionized. water In a dilute mass, the pH value is brought to 4.3, by adding dropwise a 14% solution of acetic acid with continuous stirring. The resulting microcapsule suspension is rapidly cooled to S-rlU C, then 2.7 hours, a 25% aqueous solution of glutaralic aldehyde is added to it and the mass is stirred for several hours.

thirty

20

60 55

Less than 1 Less than 1

Claims (1)

20 15 The finished dispersion of microcapsules is used to make a pressure sensitive recording material as the main component of the dior plating of the base paper (40-44 g / m). For coating, a composition of the following composition may be used, wt. including: Microcapsule suspension. 100 Solution of potato starch K 5% 50 Wheat starch5 The sheet covered with this composition is combined with the sheet covered with an acidic layer and used as a recording material. The use of the proposed complex blend of solvents for color-generating substances provides high-quality microcapsules and allows obtaining pressure-sensitive recording matrices without odor, mg-to-max and with better recording quality on copies; Intensity and clarity of prints, low speed of their fading .. Claim method of obtaining recording material by combining two sheets of paper, on the surface of one of which a pressure-sensitive layer is applied) on a layer of microcapsule dispersion containing in a color-forming substance in a mixture of organic solvents of polyisopropyldiphenyl and monoisopropyl diphenyl, and the surface is another acid layer, 6 tons l and. This is due to the fact that, in order to increase the intensity of staining, the clarity of registration, microcapsules are used that contain benzyl benzoate in the solvent mixture at the following ratio of 55-65 Jl0-30s15-25, respectively. Sources of information accepted in viimgti during examination 1. Patent SSX :: 504518, CL1 G 03 e 1 / 7t1 3: (prototype).