Bayer Aktiengesellschaft

Bayer Corporation

Wilhelm Lamberts

Albrecht Marhold

Dietmar Bielefeldt

Michael Negele

Claus-Dieter Sommerfeld

Norbert Eisen

James Thompson-Colon

Klaus Schulte

Wilfried Ebeling

Werner Dietrich

Calus-Dieter Sommerfeld

Klaus-Dieter Sommerfeld

Polyfluoroalkanes are used as propellants in sprayable compositions or in the the preparation of plastic foams and in the electrical industry as cleansing and degreasing agents.

C.sub.3 to C.sub.5 polyfluorcalkanes propellants

Polyfluoroalkanes are used as propellants in sprayable compositions or in the preparation of plastic foams and in the electrical industry as cleansing and degreasing agents.

Process for the production of hard polyurethane foams

Process for producing rigid polyurethane foams

C.sub.3 to C.sub.5 polyfluoroalkanes propellants

Isocyanate-based foams are produced by the reaction of polyisocyanates with compounds with molecular weights of from 400 to 10,000 and having at least two hydrogen atoms active towards isocyanates in the presence of hydrocarbons which are vaporizable under the foaming conditions as blowing agents. The active hydrogen component is a mixture of a) one or more nitrogen-free polyethers having at least two hydrogen atoms active towards isocyanates and containing oxyethylene residues, and b) one or more polyethers having at least two hydrogen atoms active towards isocyanates and containing no oxyethylene groups.

Process for producing isocyanate-based foams

In devices for the production of a reaction mixture, which forms a foamed plastic, from at least two reaction components and a foaming agent, it is possible to determine the content of foaming agent in a reaction component mixed therewith in that an intermediate container is provided for this mixture. The intermediate container is provided with a circulating line in which are arranged a circulating pump and a temperature-compensating viscometer. Optionally, the foaming agent content can be automatically adjusted to the theoretical value via a computer and pulse lines by influencing the drive means of the dosing pumps for the respective reaction component and the foaming agent.

Device for the production of a reaction mixture

This invention relates to an improved method of preparing closed cell foams using 1,1,1,4,4,4-hexafluorobutane as a blowing agent and insulating gas in the production of such foams, including isocyanate-based foams such as polyurethane foams and polyisocyanurate foams.

Use of 1,1,1,4,4,4-hexaefluorobutane as a blowing and insulating gas for

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Cologne, Germany

Wilhelm Lamberts