(DE10053522-A1)   NOVELTY - A ketone is added to the blowing agent and/or the melt as solubilizer for the water component of alternative blowing agents used in a process for the production of plastic foam from plastic material consisting of at least 50 wt.% polystyrene (PS), polypropylene (PP), polyethylene (PE), polymethyl methacrylate or polyethylene terephthalate.    USE - For the production of extruded plastic foam, especially e.g. polystyrene or polyolefin foam sheet.    ADVANTAGE - The use of a ketone as solubilizer enables the amount of water in the blowing agent or the plastic to be increased and simplifies the use of alternative (non-CFC) blowing agents for the production of thick foam sheet with a fine, uniform cell structure.    (DE10053523-A1)   NOVELTY - A ketone is added to the blowing agent and/or the melt as solubilizer for the water component of alternative blowing agents used in a process for the production of plastic foam from plastic material consisting of at least 50 wt.% polystyrene (PS), polypropylene (PP), polyethylene (PE), polymethyl methacrylate or polyethylene terephthalate.    USE - For the production of extruded plastic foam, especially e.g. polystyrene or polyolefin foam sheet.    ADVANTAGE - The use of a ketone as solubilizer enables the amount of water in the blowing agent or the plastic to be increased and simplifies the use of alternative (non-CFC) blowing agents for the production of thick foam sheet with a fine, uniform cell structure.    (DE10053524-A1)   NOVELTY - A ketone is added to the blowing agent and/or the melt as solubilizer for the water component of alternative blowing agents used in a process for the production of plastic foam from plastic material consisting of at least 50 wt.% polystyrene (PS), polypropylene (PP), polyethylene (PE), polymethyl methacrylate or polyethylene terephthalate.    USE - For the production of extruded plastic foam, especially e.g. polystyrene or polyolefin foam sheet.    ADVANTAGE - The use of a ketone as solubilizer enables the amount of water in the blowing agent or the plastic to be increased and simplifies the use of alternative (non-CFC) blowing agents for the production of thick foam sheet with a fine, uniform cell structure.