CS243903B1 - Coating zines for coating wood-free papers - Google Patents

Abstract

The invention deals with the preparation of N-hydroxymethyl-3-dimethoxyphosphorylpropionamide, which is the basis of a preparation for non-flammable treatment of textiles. Using the procedure according to the invention, it is possible to achieve a high quality of the preparation expressed by the amount of bound formaldehyde and the stability of the non-flammable treatment even after repeated washing and cleaning of the fabric. The result is achieved by conducting the reaction of dimethyl phosphite with acrylamide and subsequent methylation under specific conditions.

Description

243903

The present invention relates to a coating composition with improved properties in which a novel kind of special low viscosity co-polymer dispersion is applied. The coating composition for the papier-on-graphic graphical coating must exhibit a workability in the coating machine. The decisive factors for processability are its theological properties at the highest possible content of the meshes.

The decisive criterion is the quality of the paint obtained by applying the paint from the point of view of the paint. the accuracy of print reproduction, the contrast of the color scale and the workability of high-speed printing machines.

To prepare a coating composition for wood-free coated papers, pigments are used [kaolin, calcium carbonate, sintered binder, titanium dioxide and others, together with binders and other agents to improve gloss, resistance to -de, whiteness, etc.

The binders can be natural in nature (starch, casein, proteins, cellulose derivatives), synthetic (macromolecular-dispersion, polyvinyl alcohol), optionally co-biodegradable, and both. The present dispersions of non-base and butadiene-styrene latexes are fasting but have a low lightfastness, which is reflected by the yellowing of the coating. In addition, the coatings using butadiene-styrene latexes tend to be deposited on intensive drying of the printing inks. The acrylate dispersions have a higher degree of lightness, but are more expensive.

Further, in the papermaking technology, the dispersions used comprise a copolymer of butadiene base with acrylonitrile. In the production of coated cartons, the copolymers are used.

These disadvantages are eliminated by a coating composition comprising from 5 to 35% by weight of the primary alkyl ester of acrylic acid, preferably 25% by weight and 65 to 95% by weight of vinylate, preferably 75% by weight, of emulsified in water containing from 1 to 10% by weight of a mixture of alkyl-p-olyglycol ether and sodium phosphoric acid esters with alkyl polyglycol ethers of functionalizing in the presence of sodium phosphoric acid and from 0.1 to 0.25 % by weight of copolymers of propylene oxide and ethylene oxide related to the weight of the dispersion. Example 1 60 wt. parts of kaolin and 20 wt. Particulate white is dispersed in water in which 0.24 wt.% of sodium polyacrylate as a dispersing agent and 0.1 wt. die-1-hydroxypropylic acid to form a suitable pH. The thus prepared starch slurry solution containing 4 wt.%, Modified starch bridge parts and 0.5 wt. the parts of the optical j-aso ove ie ho p r ο-s tr ie dk u.

0.5 wt. 1: 5 by weight of the organic antifoam component and 0.3 parts by weight of an organic antifoam agent and water-diluted in water.

Finally, the co-polymeric dispersion of the primary alkyl ester of acrylic acid and vinyl acetate in an amount of 14.36% by weight of solid talc is carefully admixed. The addition of water gives an absolute dry weight of the coating composition 57per-c. weight. Example 2 5 wt-o-t. parts of titanium white are dispersed in water containing 0.016 wt. sodium polyacrylate and 0.005 wt. sodium hydroxide. To the dispersitite white, an amount of a suspension containing 60 wt. parts of kaolin. Also added from the calcium carbonate additive is an amount of calcium carbonate slurry containing 15% by weight of calcium carbonate. parts of that pigment. Next, proceed as in Example 1. Example 3

The suspension and pigments are prepared according to Example 2 with the proviso that the p-fraction of calcium carbonate is increased to 20 [mu] m. parts. A solution of polyvinyl alcohol containing 2.5 wt. part of polyvinyl alcohol and 0.6 wt. part of an optical brightening device. The mixture is preferably mixed with 0.3 parts by weight of a water-resistant additive -a 0.25 parts by weight of a water-dilute antifoam 1: 5. containing a total of about 11 weight percent solids. The dry-coating composition is adjusted to 58% by weight by adding water.

Claims (1)

Coating composition for coating wood-free papers consisting of pigments, emulsifier, binder and synthetic copolymer dispersion, characterized in that the synthetic copolymer dispersion consists of 5 to 35% by weight of a primary alkyl ester of acrylic acid, preferably 25 pens, and 65 to 65 wt. 95% by weight of vinyl acetate, preferably 75% OF THE INVENTION by weight, emulsified in aqueous. medium containing 1 to 10% by weight of a mixture of alkyl polyglycol ether and sodium phosphoric acid esters with alkyl polyglycol ethers as emulsifiers in the presence of sodium phosphorphonic acid salts and 0.1 to 0.25% by weight of a copolymer of propylene oxide and ethylene oxide, based on the weight of the dispersion.