发明名称 Preparing expanded-nylon polymer bead for use e.g. in expanded concrete, extrudes molten polymer containing expansion agent through die, cools and cuts
摘要 <p>To cause expansion, a composition in a molten state, comprising a polymer with an expansion agent, is extruded through a die. The product is cooled and cut by a blade at the die outlet. The expansion agent is a gas dispersing or dissolving in the molten polymer. It is pore-forming. It is a volatile compound able to dissolve in the molten polymer. It is a chemical compound able to react chemically with the polymer through heating, generating a gas. The expansible composition includes a nucleation agent and/or a surfactant and/or a plasticizer. The composition includes reinforcing additions, e.g. glass fiber, mat-forming agents, pigments, coloring agents, stabilizers against light and/or heat, bio-active agents, anti-soiling agents and/or antistatic agents. The bead is up to 10 mm in diameter, preferably 5 mm or less. The superficial density is 0.8 g/cm 3> or less, preferably 0.5 g/cm 3> or less and especially 0.3 g/m 3> or less. An independent claim is included for the corresponding polyamide bead.</p>
申请公布号 FR2856950(A1) 申请公布日期 2005.01.07
申请号 FR20030008210 申请日期 2003.07.04
申请人 RHODIA POLYAMIDE INTERMEDIATES 发明人 BRIOIS JEAN FRANCOIS;ESTUR JEAN FRANCOIS;ROCHE ERIC
分类号 B29C44/34;(IPC1-7):B29C67/20;B29B9/06;B29C47/08 主分类号 B29C44/34
代理机构 代理人
主权项
地址