Porous polymer particles
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0786807
(2001-06-28)
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우선권정보 |
EP-0203099 (1998-09-16) |
국제출원번호 |
PCT/EP99/06995
(1999-09-14)
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국제공개번호 |
WO00/15703
(2000-03-23)
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발명자
/ 주소 |
- Berghmans, Michel Florentine Jozef
- Du Mong, Kurt Ernest Irma
- Bleijenberg, Karel Cornelis
- Verbist, Guy Lode Magda Maria
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출원인 / 주소 |
- NOVA Chemicals (International) S.A.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
4 인용 특허 :
3 |
초록
▼
Porous polyvinylarene particles having a apparent density doof 600 to 200 kg/m3,which particles contain a nucleating agent and 2.0% by weight or less, based on the amount of polyvinylarene, of a volatile organic blowing agent. The invention also relates to a process for the preparation of these part
Porous polyvinylarene particles having a apparent density doof 600 to 200 kg/m3,which particles contain a nucleating agent and 2.0% by weight or less, based on the amount of polyvinylarene, of a volatile organic blowing agent. The invention also relates to a process for the preparation of these particles as well as to the use of these particles in the preparation of expanded particles and foamed articles.
대표청구항
▼
1. Porous polyvinylarene particles prepared from unexpanded polyvinylarene particles, said porous polyvinylarene particles having a certain pore structure and an apparent density doof 600 to 200 kg/m3,and which porous particles contain a nucleating agent and 2.0% by weight or less, based on the amou
1. Porous polyvinylarene particles prepared from unexpanded polyvinylarene particles, said porous polyvinylarene particles having a certain pore structure and an apparent density doof 600 to 200 kg/m3,and which porous particles contain a nucleating agent and 2.0% by weight or less, based on the amount of polyvinylarene, of a volatile organic blowing agent, and which porous particles have a volume increase that is from about 1.5 to less than 3 times compared to the volume of said unexpanded particles. 2. Particles according to claim 1, which have an apparent density doof 530 to 150 kg/m3. 3. Particles according to claim 1, which contain less than 3.0% by weight, based on the amount of polyvinylarene, of water. 4. Particles according to claim 1, which when exposed to saturated steam over atmospheric pressure to reach a final temperature of 105° C. for 30 seconds, expand to an apparent density which is at most three times lower than do. 5. Particles according to claim 1, said pore structure having pores with an average pore size of 5 to 100 μm. 6. Particles according to claim 1, in which the polyvinylarene is polystyyrene. 7. Process for the preparation of porous polyvinylarene particles, in which expandable polyvinylarene particles containing a nucleating agent and from 0.5 to 4% by weight of a C2-6organic blowing agent, based on polyvinylarene, are pre-expanded to an apparent density of 600 to 200 kg/m3to form a certain pore structure in said porous polyvinylarene particles and which porous polyvinylarene particles contain 2.0% by weight or less of said C2-6organic blowing agent, based on the amount of polyvinylarene. 8. Process according to claim 7 in which the expandable polyvinylarene particles are prepared in a suspension polymerisation process in which vinylarene is polymerised in aqueous suspension in the presence of a nucleating agent and from 0.1 to 1% by weight of a free radical initiator, wherein a C2-6organic blowing agent is added before, during or after the polymerisation, wherein the amount of blowing agent is from 0.5 to 4% by weight, based on the amount of vinylarene, to yield expandable polyvinylarene particles. 9. Process according to claim 7, in which the pre-expansion of the expandable polyvinylarene particles is effected by exposing them to hot air. 10. Process according to claim 9, in which the hot air has a temperature of from 90 to 200° C. 11. Use of the particles of claim 1 in the preparation of expanded particles and foamed articles. 12. Particles according to claim 1, which further comprise an inorganic gas. 13. Particles according to claim 12, which inorganic gas contains at most 1% by volume, based on the volume of the gas, of organic compounds. 14. Process according to claim 7 in which the porous polyvinylarene particles are further impregnated with an inorganic gas for subsequent expansion and/or molding processes. 15. Process according to claim 14 wherein said inorganic gas contains at most 1% by volume, based on the volume of the gas, of organic compounds.
이 특허에 인용된 특허 (3)
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Carlier Christophe,FRX ; Douay David,FRX ; Galewski Jean-Marc,FRX, Expandable polystyrene composition, expanded beads and moulded parts.
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Gahmig Herbert M. (Bad Durkheim DEX), Expandable polystyrene with stabilized cell structure.
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Hahn Klaus (Kirchheim DEX) Kaempfer Knut (Ludwigshafen DEX) Hintz Hans (Ludwigshafen DEX) Schaefer Anthony (Schwetzingen DEX) Riethues Michael (Ludwigshafen DEX) Witt Michael (Ludwigshafen DEX), Expandable styrene polymers containing carbon dioxide as blowing agent.
이 특허를 인용한 특허 (4)
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Nowe, Stéphane; Lodefier, Philippe; Urbanczyk, Laetitia, Expandable vinyl aromatic polymers.
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Noordegraaf, Jan, Particulate expandable polystyrene (EPS), process for making particulate expandable polystyrene, as well as a particular application of polystyrene foam material.
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Berghmans,Michel Florentine Jozef; Bleijenberg,Karel Cornelis; Teubert,Joachim; Metsaars,Alphonsus Catharina Gerardus, Process for processing expandable polymer particles and foam article thereof.
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Johnston,Richard W; Clark,Richard F., Ultra low density thermally clad microspheres and method of making same.
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