VERFAHREN ZUR HERSTELLUNG VON FORMTEILEN AUS FLEXIBLEM POLYURETHAN-INTEGRALSCHAUMSTOFF

• Main Authors: FELDER, INGO, MUEHLECK, ALOIS, SCHLUNG, ARMIN
• Format: Patent
• Language: German
• Published: 15.09.1997
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MOTOR VEHICLES; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRAILERS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

In a process for the production of mouldings from flexible PUR structural (integral) foam by foam moulding by means of polyaddition of a polyol with an isocynate in the presence of water, a closed, tough outer layer on the mouldings is formed by introducing 40 to 60% by volume of air, from 0.05 to 2.5% by weight of water and 0.25 to 2.0% by weight of one of the C1- to C6-hydrocarbons into the polyol.