公开(公告)号：EP0818292A3

公开(公告)日：1999-04-21

申请号：EP97305063.6

申请日：1997-07-09

申请人： MITSUI TOATSU CHEMICALS, INCORPORATED

发明人： Nishikawa, Shigeo ,  Yorita, Kaoru ,  Ichikawa, Kouzo ,  Inoue, Haruo ,  Eriguchi, Michio ,  Sueda, Takanori ,  Amemiya, Hideo

IPC分类号： B29C44/46

CPC分类号： B29C44/461 ,  B29C44/3446 ,  B29C44/348 ,  Y10S264/13

摘要： A process for preparing an expanded product of a thermoplastic resin is herein disclosed which comprises a gas dissolving step of adding supercritical carbon dioxide and/or nitrogen as an blowing agent to a thermoplastic resin, and melting it in the thermoplastic resin, a cooling step of cooling the resulting molten resin composition under a pressure not less than a critical pressure of the blowing agent, a nuclei forming step of discharging the molten resin composition from a die(4)to lower the pressure to a level not more than the critical pressure, and an expansion controlling step of cooling an expanded product of the thermoplastic resin to a level not more than a glass transition temperature or a crystallization temperature of the resin to control a cell diameter of the expanded product, wherein the process comprises a shear rate adjusting section (12) having a function of generating a shear rate in the range of 10 2 to 10 4 sec -1 and having a sectional area A, and a flow velocity distribution adjusting section (13) having a function of lowering the shear rate and having a sectional area B, and B/A is in the range of 1.3 to 20, whereby a cell diameter and a cell density are controlled. According to this process, the expanded product of the thermoplastic resin can be obtained which has an excellent surface appearance, a high strength, and cells of a fine average cell diameter and a uniform average cell density and in which carbon dioxide and/or nitrogen is used as the blowing agent.

摘要翻译： 一种用于热塑性树脂的发泡制品的制备方法是在游离缺失盘，它包括一个气体溶解加入的超临界二氧化碳和/或氮气作为发泡剂的热塑性树脂，而在热塑性树脂熔融它，的冷却步骤的步骤 压力不低于发泡剂的临界压力小于下冷却所得到的熔融树脂组合物，核形成从第（4），以降低的压力排出的熔融树脂组合物至不超过临界压力的步骤， 和发泡控制冷却到热塑性树脂的发泡制品的水平不高于玻璃化转变温度或该树脂以控制发泡制品的泡孔直径的结晶温度以上的步骤的速率，worin所述方法包括剪切调整部分 （12），其具有在10 <2> 10 <4>秒<-1>的范围内产生的剪切速率和具有截面积A的功能，和一个流量VELO 城市分布具有降低剪切速率的函数，并且具有的截面积B，和B / A在1.3〜20的范围内，由此泡孔直径和泡孔密度来控制调整部分（13）。 。根据此方法，热塑性树脂的发泡制品能够获得具有优良的表面外观，较高的强度，和微细平均泡孔直径和均匀平均泡孔密度的细胞并在其中二氧化碳和/或氮气是 用作发泡剂。

公开(公告)号：EP0818292A2

公开(公告)日：1998-01-14

申请号：EP97305063.6

申请日：1997-07-09

申请人： MITSUI TOATSU CHEMICALS, INCORPORATED

发明人： Nishikawa, Shigeo ,  Yorita, Kaoru ,  Ichikawa, Kouzo ,  Inoue, Haruo ,  Eriguchi, Michio ,  Sueda, Takanori ,  Amemiya, Hideo

IPC分类号： B29C44/46

CPC分类号： B29C44/461 ,  B29C44/3446 ,  B29C44/348 ,  Y10S264/13

摘要： A process for preparing an expanded product of a thermoplastic resin is herein disclosed which comprises a gas dissolving step of adding supercritical carbon dioxide and/or nitrogen as an blowing agent to a thermoplastic resin, and melting it in the thermoplastic resin, a cooling step of cooling the resulting molten resin composition under a pressure not less than a critical pressure of the blowing agent, a nuclei forming step of discharging the molten resin composition from a die(4)to lower the pressure to a level not more than the critical pressure, and an expansion controlling step of cooling an expanded product of the thermoplastic resin to a level not more than a glass transition temperature or a crystallization temperature of the resin to control a cell diameter of the expanded product, wherein the process comprises a shear rate adjusting section (12) having a function of generating a shear rate in the range of 10 2 to 10 4 sec -1 and having a sectional area A, and a flow velocity distribution adjusting section (13) having a function of lowering the shear rate and having a sectional area B, and B/A is in the range of 1.3 to 20, whereby a cell diameter and a cell density are controlled. According to this process, the expanded product of the thermoplastic resin can be obtained which has an excellent surface appearance, a high strength, and cells of a fine average cell diameter and a uniform average cell density and in which carbon dioxide and/or nitrogen is used as the blowing agent.