Wacker-chemie Gmbh

The Dow Chemical Company

Bernd Schilling

Manfred Selig

Norman Haberle

Reiner Figge

Wolfgang Deinhammer

Joachim Schulze

Anneliese Reutter

Karl-Ernst Fickert

Karl E Fickert

Wood glue powder

A process is provided for the preparation of polyvinyl alcohols absorbed onto pigments. In the process 10% to 30% strength by weight of aqueous solutions of partially hydrolyzed polyvinyl alcohols or fully or partially hydrolyzed vinyl alcohol copolymers, which are soluble in cold water, are spray-dried after the addition of 20% to 40% by weight, relative to the total solids content of the resulting suspension, of organic or inorganic pigments, preferably chalk. The invention is also directed to the pulverulent product and its use, wherein the product is distinguished by good flow capacity and an extremely low methanol content. It is suitable for use as a binder in paper coating compositions and in coatings for the surface finishing of paper and cardboard.

Process for the preparation of polyvinyl alcohols which are soluble in

Fungicidal 4-monohaloacetoacetoacetanilides

In a coating slip for coating flat surfaces comprising an aqueous dispersion, with a solids content of 8 to 65% by weight, of 100 parts by weight of a pigment, 3 to 30 parts by weight of synthetic high-molecular-weight binder based on copolymers of acrylates, styrene, butadiene and unsaturated carboxylic acid esters and 0.5 to 2 parts by weight of a cobinder the improvement comprising using a cobinder polymer containing a large degree of hydroxyl groups comprising (a) 50 to 95% by weight of vinyl alcohol units, (b) 5 to 50% by weight of 1-alkylvinyl alcohol units of 1 to 4 alkyl carbon atoms, (c) 0 to 20% by weight of vinyl acylate units, (d) 0 to 20% by weight of allyl alcohol units and (e) 0 to 5% by weight of other polymerizable monomers having improved pigment shock behavior and very good activity as an optical brightener support.

Novel coating slips

An improved process for the manufacture of 2-isopropyl-4-methyl-6-hydroxypyrimidine, starting from 3-aminocrotonic acid amide and an acylating agent, without isolating the intermediately formed 3-isobutyrylaminocrotonic acid amide. In a first process step, the acylation is carried out with excess isobutyric acid anhydride in the presence of an alkali metal salt of isobutyric acid at temperatures of from 50.degree. to 120.degree. C. and in the absence of a solvent. In a second process step, the cyclization is carried out in the resulting reaction mixture by the addition of an aqueous alkali metal hydroxide solution at temperatures of from 80.degree. to 105.degree. C., and then the hydroxypyrimidine is isolated in known manner. The total quantities of alkali metal hydroxide added in the second process step are such that they are sufficient both for the neutralization of the isobutyric acid present in the reaction mixture and also for the cyclization. Less than 1 mole of alkali metal hydroxide per mole of the 3-aminocrotonic acid amide originally used is used for the cyclization itself.

Process for the manufacture of 2-isopropyl-4-methyl-6-hydroxypyrimidine

Growing community of inventors

Burghausen, Germany

Bernd Schilling