Basf Aktiengesellschaft

Badische Anilin- & Soda-fabrik Aktiengesellschaft

Guenther Matthias

Hans Diem

Gunter Lehmann

Otto Wittmann

Hans Haas

Friedrich Kraus

Christian Dudeck

Albrecht Aicher

Otto Grabowsky

Oskar Hussy

Norbert Petri

Hubert Tiefenbacher

Dieter Wolf

Johann Mayer

Christof Schmidt-Hellerau

Wolfgang Muehlthaler

Heinrich Sperber

Hermann Schatz

Oskar Hussey, Deceased

Herbert Libowitzky

Friedrich Brunnmueller

Karl Buschmann

Heinz Lehnert

Friedrich Wodtcke

Robert Fritsch

Engelbert Weber

Dieter Merkel

Guenther Schoenaich

Bruno Maurer

Karl Seither

Aqueous aminoresin solutions for low-formaldehyde surface bonding, based on condensates of melamine, urea, phenol and formaldehyde having a molar ratio of from 1.4 to 1.8 moles of formaldehyde, from 0.04 mole to 0.1 mole of melamine and from 0.015 to 0.04 mole of phenol per mole of urea, relative to the total amount of the aminoresin, are obtainable by mixing

Aqueous aminoresin solutions for low-formaldehyde surface bonding

In the proposed pulverulent aminoplast adhesive resin for wood-base materials having a low formaldehyde emission, the resin is a mixture of

Pulverulent aminoplast adhesive resin for wood-base materials having a

Calcium propionate is prepared by passing a vaporous mixture of propionic acid and water into an aqueous solution containing calcium propionate and calcium hydroxide, with or without propionic acid.

Preparation of calcium propionate

In a proposed aminoplast adhesive resin powder for wood-based materials, which eliminates little formaldehyde, the resin is a mixture of

Aminoplast adhesive resin powder for wood-based materials or as a paper

An aqueous solution of a resin glue comprising formaldehyde, urea, melamine and phenol is obtained when phenol, formaldehyde and not more than 0.35 mole of an alkali metal bisulfite per mole of phenol are reacted to give a phenol-formaldehyde condensate, formaldehyde and urea in a molar ratio of not more than 2.5 are reacted to give a urea-formaldehyde condensate, and the reaction products are in turn reacted with melamine and formaldehyde.

Preparation of cocondensates which produce weather-resistant bonding

Glyoxal is prepared by oxidizing glycol in the presence of a silver catalyst of a defined particle size and under defined conditions of temperature, residence time and inert gas concentration. The glyoxal obtainable by the process of the invention may be used in wrinkle-resist finishing, as an assistant for increasing the tensile strength and resilience of fibrous materials, a tanning agent, a hardener in the photographic industry, and a starting material for the manufacture of synthetic resins, textile auxiliaries, for example to prevent shrinkage after washing, paper additives, for example for increasing the wet strength, and plastics.

Preparation of glyoxal

Feed pellets are produced by homogeneously mixing feed meals with from 0.1 to 2% of a pulverulent urea-formaldehyde resin obtained by spray-drying a glue solution, and pelletizing the mixture.

Manufacture of pellets from feed meals

Manufacture of formaldehyde by oxidative dehydrogenation of methanol in the presence of a silver catalyst using methanol obtained from a condensate derived from the evaporation of aqueous reaction mixtures in the synthesis of urea resins and then treated with caustic soda solution under specific conditions of temperature, pressure, residence time and initial formaldehyde concentration. The formaldehyde obtained is a disinfectant, tanning agent, reducing agent and starting material for the manufacture of synthetic resins, adhesives and plastics.

Manufacture of formaldehyde

The production of formaldehyde by oxidizing dehydrogenation of methanol in the presence of a silver catalyst using air which has been washed with a solution of an alkali metal compound in water and methanol in specific proportions. The product is a disinfectant, tanning agent, reducing agent and a starting material for the production of synthetic resins, adhesives and plastics.

Production of formaldehyde

The production of formaldehyde by oxidizing dehydrogenation of methanol in the presence of a silver catalyst which consists of three or more layers each of specific weight and particles of specific particle size and having a specific total layer thickness. Formaldehyde prepared according to the process of the invention is a disinfectant, tanning agent, reducing agent and valuable starting material for the production of synthetic resins, adhesives and plastics.

Stabilized, aqueous formaldehyde solutions and a process for their manufacture by addition of isophthalobis-guanamine and/or terephthalo-bis-guanamine. The formaldehyde solution of the invention is used as a disinfectant, tanning agent or reducing agent, and as a starting material for the manufacture of synthetic resins, adhesives and plastics.

Stabilized aqueous formaldehyde solutions and process for their

Manufacture of formaldehyde by oxidative dehydrogenation of methanol in the presence of a silver catalyst, wherein methanol and water are evaporated in the presence of air in a plate column containing a number of double plates each consisting of a sieve plate and a lower plate having the form of a shallow bowl and inclined at a specific angle to the horizontal, the resulting vaporous mixture then being reacted. The formaldehyde which may be produced by the process of the invention is a disinfectant, tanning agent, reducing agent and a valuable starting material for the manufacture of synthetic resins, adhesives and plastics.

Production of formaldehyde by oxidizing dehydrogenation of methanol in the presence of a silver catalyst and a tertiary or secondary amine. The formaldehyde which can be prepared by the invention is a disinfectant, tanning agent, reducing agent and valuable starting material for the production of synthetic resins, adhesives and plastics.

Production of formaldehyde by vaporization of a mixture of methanol and water in the presence of a mixture of alkanols and dialkylethers, and then by a catalytic, oxidizing dehydrogenation of methanol. The formaldehyde obtainable according to the process of the invention is useful as a disinfectant, a tanning material, a reducing agent or as a valuable initial material for the production of synthetic resins, adhesives and plastics.

Process for the production of formaldehyde

The preparation of isobutylidenediurea from isobutyraldehyde and urea, the particle size of the product being controlled by alternate use of sulfuric acid and phosphoric acid.

Growing community of inventors

Ludwigshafen, Germany

Guenther Matthias