Bayer Aktiengesellschaft

Ge Bayer Silicones Gmbh & Co. Kg

Momentive Performance Materials Gmbh

Gerhard Heilig

Rolf Wiedermann

Norbert Eisen

Karl Werner Dietrich

Wolfgang Schmitz

Pramod Gupta

Helmut Steinberger

Herbert Gebauer

Thomas Gross

Claus Dieter Sommerfeld

Ralf Kr&uuml;ger

The invention provides non-stick coated molds, a process for the preparation thereof and their use for the production of plastics molded parts, particularly for the production of molded parts made of polyurethane foam.

Non-stick coated molds

The description relates to production of rigid foamed plastics containing urethane groups, by use of a blowing-agent mixture containing 5 to 50 parts by weight of C and/or C alkanes and 50 to 95 parts by weight of cyclopentane. There is also a description of use of the thus-produced rigid foamed plastics as composite components or for foam filling of cavities in refrigerator construction.

Process for preparing rigid foamed materials containing urethane groups

The present invention relates to a process for the production of partially fluorinated fluoropolymers, in accordance with which fluoromonomers are free-radically polymerized in the presence of polyfluoropropanes or polyfluorobutanes of the formulae CF &mdash;CH &mdash;CF H, CF &mdash;CHF&mdash;CF &mdash;H, CF &mdash;CH &mdash;CF , CHF &mdash;CF &mdash;CH F, CF &mdash;CH &mdash;CF &mdash;CH AND CF &mdash;CHF&mdash;CF &mdash;CH and optionally a chain-transfer agent.

Method for the production of partially fluorinated fluoropolymers

Process for producing hydrocarbon-blown hard polyurethane foams

Rigid polyurethane foams are produced by reacting a polyisocyanate with a polyester containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of 400 to 10,000 in the presence of water, an organic blowing agent, a flameproofing agent and a compound containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight in the range from 32 to 399 as crosslinking agent, optionally in the presence of known auxiliaries and additives. The polyester, the flameproofing agent and the crosslinking agent are used in quantities such that from about 15 to about 35 parts by weight of polyester, from about 50 to about 80 parts by weight flameproofing agent and from about 5 to about 15 parts by weight of crosslinking agent (with the sum of the parts by weight of these components adding up to 100) are present. These foams are useful as insulating materials in applications where flame resistance is important.

Process for the production of rigid polyurethane foams

Rigid foams containing urethane and isocyanurate groups are made by reacting a polyisocyanate with a compound containing at least two isocyanate reactive hydrogen atoms in the presence of an aqueous solution of alkali metal carboxylate in accordance with known techniques. The aqueous alkali metal carboxylate solution has an alkali metal carboxylate content of from about 10 to about 50% by weight. The alkali metal carboxylates are preferably alkali metal acetates such as potassium acetate. This process is carried out at an index above 150. The product foams are particularly useful as insulating materials.

Process for the production of rigid foams containing urethane and

This invention relates to novel urethane-modified polyisocyanate mixtures of the diphenylmethane series prepared by a process comprising reacting polyisocyanates or polyisocyanate mixtures of the diphenylmethane series with certain monohydric and/or polyhydric alcohols and, optionally, subsequently mixing the initially modified products with polyisocyanates or polyisocyanate mixtures of the diphenylmethane series that have not been modified with urethane groups. This invention further relates to the use of the polyisocyanate mixtures in the preparation of polyurethane foams.

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Bergisch Gladbach, Germany

Gerhard Heilig