11-07-2019 дата публикации
Номер: US20190211172A1
Принадлежит:
The present invention is a process for foaming thermoplastic polymer comprising polystyrene said process comprising forming a molten foamable composition comprising said thermoplastic polymer, block copolymer, and blowing agent comprising at least one of Z-1,1,1,4,4,4-hexafluoro-2-butene and E-1,1,1,4,4,4-hexafluoro-2-butene and expanding said foamable composition to obtain as a result thereof foamed thermoplastic polymer, the process being preferably carried out by extruding the composition in molten form, whereupon the foaming of the thermoplastic polymer occurs. 1. Process for foaming thermoplastic polymer comprising polystyrene , said process comprising forming a molten foamable composition comprising said thermoplastic polymer , block copolymer , and blowing agent comprising at least one of Z-1 ,1 ,1 ,4 ,4 ,4-hexafluoro-2-butene and E-1 ,1 ,1 ,4 ,4 ,4-hexafluoro-2-butene and expanding said foamable composition to obtain as a result thereof foamed thermoplastic polymer.2. The process of wherein said molten foamable composition is in an extruder and said expanding is the result of extruding said composition.3. The process of wherein said block copolymer is non-polar.4. The process of wherein the amount of said block copolymer present in said composition is 5 to 15 wt % claim 1 , based on the weight of said foamable composition.5. The process of wherein said Z-1 claim 1 ,1 claim 1 ,1 claim 1 ,4 claim 1 ,4 claim 1 ,4-hexafluoro-2-butene and E-1 claim 1 ,1 claim 1 ,1 claim 1 ,4 claim 1 ,4 claim 1 ,4-hexafluoro-2-butene are highly insoluble in said molten thermoplastic polymer as indicated by a weight gain of no greater than 8 wt %6. The process of wherein said block copolymer is insoluble in said Z-1 claim 1 ,1 claim 1 ,1 claim 1 ,4 claim 1 ,4 claim 1 ,4-hexafluoro-2-butene and E-1 claim 1 ,1 claim 1 ,1 claim 1 ,4 claim 1 ,4 claim 1 ,4-hexafluoro-2-butene.7. The process of wherein said Z-1 claim 1 ,1 claim 1 ,1 claim 1 ,4 claim 1 ,4 claim 1 ,4-hexafluoro-2-butene ...
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