Bayer Aktiengesellschaft

Martin Brock

Ralf Pohlig

Ralf Busch

Richard Weider

Ulrich Knipp

Andreas Ruckes

Hans Hettel

Peter Schuster

Hans-Joachim Kogelnik

Christian Wolfrum

Ronald Boot

A process for the production of composite bodies consisting of a polyurethane core and a polyurethane covering, with the core being positioned inside a mold so that an average distance of at least 0.5 mm exists between the surface of the core and the internal wall of the mold. The gap between the core and the internal wall of the mold is filled with a reaction mixture composed of a) a polyisocyanate component, and b) a polyol component. The polyol component b) must have a weight ratio of carbon to oxygen of at least 2.5:1.

Process for the production of composite bodies

The present invention is directed to a process for the production of polyurethanes using catalysts based on triamino(imino)phosphoranes corresponding to formulas I, II or III ##STR1## wherein R, R', R' and R'' represent hydrocarbon substituents and

Process for the production of plastics by the polyisocyanate

Open-celled, elastic, flexible polyurethane foams are made without using a chlorofluorocarbon blowing agent. A polyisocyanate is reacted with a polyether in the presence of water and from about 0.1 to abour 10% by weight (based on polyether) of an organic blowing agent selected from dicarbonic acid alkyl esters, dicarbonic acid cycloalkyl esters, dicarbonic acid benzyl esters and combinations thereof. Optional starting materials include catalysts, chain lengthening agents, emulsifiers and other commonly used additives.

Open-celled flexible polyurethane foams and a process for their

A process for the production of foam cushions from different fluid reaction mixtures comprising introducing a first reaction mixture and at least one other reaction mixture into a mold cavity and leaving the mixtures to react to form a cushion having zones of differing elasticity or firmness, characterized in that one of the two reaction mixtures is not introduced into the mold cavity until it has creamed up and is already viscous, and in that the second reaction mixture, which has not creamed up, is introduced at the same time or later.

Process for the production of foam cushions from different fluid

A process for the production of foam cushions from different fluid reaction mixtures comprising introducing a first and at least one other reaction mixture into a mold cavity and leaving the mixtures to react to form a cushion having zones of differing elasticity or rigidity characterized in that the reaction mixtures are not introduced into the mold cavity until they have started to cream up and are already viscous.

The present invention is directed to a process for the production of heat curable, flexible, polyurethane molded foams by the reacting inside a closed mold

Process for the production of heat curable flexible polyurethane molded

A process for producing foam cushions having sections of different hardnesses using foam molding. The process broadly includes introducing a first reaction mixture into a mold, introducing a second reaction mixture into a mold, said second mixture already being in a creamed state, allowing the reaction mixtures to foam, and removing the resultant product from the mold. Prior to the introduction of the first mixture, a web with holes in it is clamped over a deepened section of the mold cavity. The first reaction mixture is then fed onto the web, with the first mixture being in a sufficiently liquid state so as to allow it to flow through the holes and into the space below the web. The second reaction mixture is then fed into the space remaining above and to the sides of the web. The second mixture is introduced at a time when itis sufficiently creamed up so that it cannot flow through the holes in the web.

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Cologne, Germany

Martin Brock