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AssigneeSekisui Kaseihin Kogyo Kabushiki Kaisha
InventorsMotoshige Hayashi, Norio Amano, Takeshi Taki, Takaaki Hirai
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A process for producing a thermoplastic polyester resin foam comprising melting a thermoplastic polyester resin, mixing the molten resin with a blowing agent and extruding the mixture into a low-pressure zone to carry out expansion molding, characterized in that a compound having two or more acid anhydride groups per molecule, optionally together with a compound of a metal of Group I, II or III elements of the Periodic Table is added to the thermoplastic polyester resin. There is also disclosed a process for producing a thermoplastic polyester resin foam comprising cooling a high-temperature foam immediately after expansion and then re-heating the foam. Further, a thermoplastic polyester resin foam sheet and a food container prepared from the foam sheet are also disclosed.
A process for producing a thermoplastic polyester resin foam comprising melting a thermoplastic polyester resin, mixing the molten resin with a blowing agent and extruding the mixture into a low-pressure zone to carry out foaming, characterized in that a compound having two or more acid anhydride groups per molecule is added to the thermoplastic polyester resin
A process for producing a thermoplastic polyester resin foam comprising melting a thermoplastic polyester resin, mixing the molten resin with a blowing agent and extruding the mixture into a low-pressure zone to carry out foaming, characterized in that a compound having two or more acid anhydride groups per molecule and a compound of a metal of Group I, II or III elements of the Periodic Table are added to the thermoplastic polyester resin.
A process for producing a thermoplastic polyester resin foam comprising cooling a high-temperature thermoplastic polyester resin foam immediately after expansion to a temperature of not higher than the glass transition point of the resin to bring crystallinity to 30% or lower and then heating the foam to 60.degree. C. or higher.
A thermoplastic resin foam sheet characterized by that said sheet is an extruded foam sheet of a thermoplastic polyester resin and has a crystallinity of not higher than 20% and a molecular orientation ratio of 4.5 or lower looking the direction from the surface of the foam sheet.
A food container produced by laminating a non-foam film of a thermoplastic resin on at least one side of the foam sheet of a thermoplastic polyester resin to obtain a laminated sheet and molding the laminated sheet into a container in such a manner that the non-foam film is positioned inside the container.
Dependencies are inferred from the claim text.