Bayer Aktiengesellschaft

Mobay Corporation

Peter Gansen

Klaus Seel

John J Lindsey

Klaus-Dieter Wolf

Reinhard Samaritter

Klaus D Wolf

Rudi Wolfgramm

The present invention is directed to a process for the preparation of molded cold-cure polyurethane flexible foams. The process requires the use of aromatic polyisocyanates, a specifed mixture of polyether polyols which have specified ethylene oxide contents and a specified amount of water as blowing agent. The reaction is conducted in a closed mold at an isocyanate index of from 80 to 120.

Preparation of flexible, molded, cold-cure polyurethane foams

The present invention relates to a process for the preparation of low-density flexible polyurethane foams comprising reacting, in a closed mold, a mixture comprising polyisocyanates; compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight in the range from about 400 to about 10,000; water as blowing agent; optionally, compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight in the range from 32 to 399 as chain-extending and crosslinking agents; and optionally, one or more known auxiliaries and additives, wherein one or more of the reaction mixture components is heated before foaming to a temperature of at least 40.degree. C.

Process for the preparation of low-density flexible polyurethane foams

This invention relates to a process for the production of cold-setting flexible polyurethane foam useful for damping sound comprising reacting a polyisocyanate in the presence of water with (a) at least one polyether having an OH number of from 20 to 60 and containing at least two OH groups, wherein said polyether is based on 75 to 95% by weight propylene oxide and 5 to 25% by weight ethylene oxide; (b) a polyether or polyester having an OH number of from 150 to 400 and containing at least two OH groups; and (c) a polyether different from components (a) and (b) having an OH number of from 20 to 200 and containing at least two OH groups, wherein said polyether is based on propylene oxide and ethylene oxide and has an ethylene oxide content above 50% by weight based on the total amount of propylene oxide and ethylene oxide.

Process for the production of cold-setting flexible polyurethane foams

This invention relates to liquid urethane-modified polyisocyanate compositions obtained by reaction of polyisocyanates or polyisocyanate mixtures of the diphenylmethane series containing from about 50 to about 100% by weight diisocyanatodiphenylmethane isomers with substoichiometric quantities of polyether polyol compositions having an average hydroxyl equivalent weight of about 500 to 3000 and an average hydroxyl functionality greater than about 4, optionally followed by mixing the initially formed reaction product with urethane-free polyisocyanates or polyisocyanate mixtures of the diphenylmethane series containing from about 40 to about 100% by weight diisocyanatodiphenylmethane isomers. This invention also relates to a process for the preparation of such polyisocyanate compositions. The invention further relates to the use of such compositions as the polyisocyanate component in the production of flexible polyurethane foams.

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Cologne, Germany

Peter Gansen