PLASTIC FOAM

• Main Authors: MARHOLD ALBRECHT, NEGELE MICHAEL, SOMMERFELD CLAUS-DIETER, BIELEFELDT DIETMAR, LAMBERTS WILHELM
• Format: Patent
• Language: English
• Published: 26.03.1999
• Edition: 6
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; CANDLES; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; COMPOSITIONS BASED THEREON; DETERGENT COMPOSITIONS; DETERGENTS; DIFFUSION TREATMENT OF METALLIC MATERIAL; DYES; FATTY ACIDS THEREFROM; GENERAL PROCESSES OF COMPOUNDING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; RECOVERY OF GLYCEROL; RESIN SOAPS; SOAP OR SOAP-MAKING; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF SINGLE SUBSTANCES AS DETERGENTS; WORKING-UP

PROBLEM TO BE SOLVED: To obtain a closed-cell foam by foaming a plastic based on a polystyrene, a polyvinyl chloride or a phenol/formaldehyde condensate in the presence of a propellant containing a polyfluoroalkane. SOLUTION: There is provided a closed-cell foam obtained by foaming a plastic based on a polystyrene, a polyvinyl chloride or a phenol/formaldehyde in the presence of a propellant containing at least two fluorine atoms and represented by the formula: CX3 -CY2 -R. A urethane foam is obtained by reacting a mixture comprising an aliphatic, cycloaliphatic or aromatic polyisocyanate or the like, a polyether having at least two hydroxyl groups or the like; a chain extender or a crosslinking agent, a propellant and an insulation gas. In the formula, X is H or F; Y is H, F or CF3 ; and R is CH2 F, CHF2 , CH3 , CF3 , CF2 -CH3 , CF2 CH2 F or the like.