发明名称 |
POLYSTYRENE-CONTAINING COMPOSITE RESIN PARTICLES AND METHOD FOR PRODUCING SAME, EXPANDABLE COMPOSITE RESIN PARTICLES, PRE-EXPANDED PARTICLES, AND EXPANDED MOLDED ARTICLE |
摘要 |
Polystyrene-based composite resin particles includes 100 to 500 parts by weight of a polystyrene-based resin with respect to 100 parts by weight of an ethylene-vinyl acetate copolymer resin. The polystyrene-based composite resin particles are impregnated with a volatile blowing agent and are pre-expanded to obtain pre-expanded particles; the obtained pre-expanded particles are immersed in tetrahydrofuran for 24 hours to obtain an extract A; and the pre-expanded particles are divided into two halves through the center to prepare halved particles, and the halved particles are immersed in tetrahydrofuran for 24 hours to obtain an extract B; and the obtained extract A and extract B are subjected to a GPC (gel permeation chromatography) measurement and obtain the following results: the polystyrene-based resin having a weight-average molecular weight (Mw) of 100,000 to 500,000 gives a peak obtained from chromatograms for the extract A and for the extract B. |
申请公布号 |
US2016208068(A1) |
申请公布日期 |
2016.07.21 |
申请号 |
US201415023491 |
申请日期 |
2014.09.24 |
申请人 |
SEKISUI PLASTICS CO., LTD. |
发明人 |
GONDO Yuichi;MORISHIMA Naoya |
分类号 |
C08J9/18;C08J9/228;C08L25/04 |
主分类号 |
C08J9/18 |
代理机构 |
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代理人 |
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主权项 |
1. Polystyrene-based composite resin particles comprising 100 to 500 parts by weight of a polystyrene-based resin with respect to 100 parts by weight of an ethylene-vinyl acetate copolymer resin,
wherein the polystyrene-based composite resin particles are impregnated with a volatile blowing agent and are pre-expanded to obtain pre-expanded particles; the obtained pre-expanded particles are immersed in tetrahydrofuran for 24 hours to obtain an extract A; and the pre-expanded particles are divided into two halves through the center to prepare halved particles, and the halved particles are immersed in tetrahydrofuran for 24 hours to obtain an extract B; and the obtained extract A and extract B are subjected to a GPC (gel permeation chromatography) measurement and obtain the following results: the polystyrene-based resin having a weight-average molecular weight (Mw) of 100,000 to 500,000 gives a peak obtained from chromatograms for the extract A and for the extract B; and a ratio Ps:Pi stands at 1:10 or higher, in which Ps indicates peak top intensity of the chromatogram for the extract A, and Pi indicates peak top intensity of the chromatogram for the extract B; or a ratio Ss:Si stands at 1:10 or higher, in which Ss indicates a peak area of the chromatogram for the extract A, and Si indicates a peak area of the chromatogram for the extract B. |
地址 |
Osaka JP |