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US 6,187,830 B1Granted
Process for the preparation of foamed articles
AssigneeAkzo Nobel N.V.
InventorsGeert Boven, Gerard Henk Beijers, Jernej Jelenic
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AssigneeAkzo Nobel N.V.
InventorsGeert Boven, Gerard Henk Beijers, Jernej Jelenic
Estimating the term…
The present invention relates to a process for the preparation of a foamed article having a foam density of less than 180 kg/m3 and an average cell diameter of less than 1.5 mm comprising the extrusion of a molten semi-crystalline thermoplastic resin composition in the presence of a foaming agent, with the semi-crystalline thermoplastic resin composition comprising a polymeric epoxide containing at least two epoxide groups being a copolymer of a monomer mixture comprising at least one C10 to C18-olefin and at least one ethylenically unsaturated compound comprising an epoxide group. The process results in the preparation of foamed articles having a regular and homogeneous structure. Another advantage of the present invention is that it is not necessary anymore to add a compound of Group Ia, IIa, or IIIa of the Periodic Table, such as LiCl, to the extrusion process.
A process for the preparation of a foamed article having a foam density of less than 180 kg/M3 and an average cell diameter of less than 1.5 mm comprising the extrusion of a molten semi-crystalline thermoplastic resin composition in the presence of a foaming agent, with the semi-crystalline thermoplastic resin composition comprising a resin selected from the group consisting of polyester and polyamide resins, and further comprising a polymeric epoxide that contains at least two epoxide groups and that is a copolymer of a monomer mixture comprising at least one C10 to C18-olefin and at least one ethylenically unsaturated compound comprising an epoxide group.
Dependencies are inferred from the claim text.