Abstract:
The present invention relates to a multimodal polyethylene composition which can be manufactured into pipes showing improved pressure resistance comprising a high density multimodal ethylene polymer component (A) having a density of at least 930 kg/m 3 , and a MFR 21 of not more than 15 g/10 min, wherein said composition exhibits a LAOS-NLF defined as Formula (I) where G ' 1 - first order Fourier Coefficient G ' 3 - third order Fourier Coefficient of at least 1.7. Such a polyethylene composition is useful for the manufacture of pressure pipes that exhibit improved pressure resistance and creep resistance and do not undergo sagging. Further disclosed is a process for the production of a pipe using such a multimodal polyethylene composition and a pipe comprising such a multimodal polyethylene composition.
Abstract translation:本发明涉及一种多峰聚乙烯组合物,其可以制造成显示出改进的耐压性的管,其包含密度为至少930kg / m 3的高密度多峰乙烯聚合物组分(A),MFR 21不大于15g 10分钟,其中所述组合物显示定义为式(I)的LAOS-NLF,其中G'1-一级傅立叶系数G'3-三阶傅里叶系数为至少1.7。 这种聚乙烯组合物可用于制造显示出改善的耐压性和抗蠕变性并且不会下垂的压力管。 进一步公开了使用这种多峰聚乙烯组合物生产管道的方法和包含这种多峰聚乙烯组合物的管道。
Abstract:
The present invention is directed to a process for producing a modified olefin polymer having increased melt strength in an extruder. The process comprising the steps of: (A) contacting a stream comprising particles of an olefin polymer with a vapour stream of a functionally unsaturated compound in vapour phase thereby producing a first mixed stream; (B) passing the first mixed stream to an extruder; (C) melting the polymer particles of the first mixed stream in the extruder; (D) introducing a stream of a free radical generator either into the first mixed stream or into the extruder; and (E) extruding the first mixed stream and the free radical generator at a temperature which is greater than the decomposition temperature of the free radical generator and the melting temperature of the olefin polymer but less than the decomposition temperature of the olefin polymer thereby producing the modified olefin polymer in the extruder.
Abstract:
The present invention relates to a polypropylene composition comprising a branched polypropylene (b-PP) having high melt strength (HMS). Furthermore, the present invention also relates to a method for providing the corresponding polypropylene having composition comprising the branched polypropylene (b-PP) and to a film with the polypropylene composition comprising the branched polypropylene (b-PP). The branched polypropylene (b-PP) is based on a random copolymer with a small amount of ethylene.
Abstract:
The present invention provides a process for extruding and pelletising a propylene copolymer. The copolymer has a content of comonomer from 5 to 40% by mole, a melt flow rate MFR 2 measured at 230 °C under a load of 2.16 kg of from 0.5 to 15 g/10 min and a content of cold xylene soluble material of from 20 to 60% by weight. The process comprises extruding the propylene copolymer through a die plate into an underwater pelletiser and cutting strands of the propylene copolymer into pellets in the underwater pelletiser, wherein the ratio of the mass flow rate of the propylene copolymer to the mass flow rate of the cooling water is from 0.020 to 0.060; and the propylene copolymer comprises a polymeric nucleating agent.
Abstract:
Process for providing a polypropylene composition comprising a branched polypropylene in which a polypropylene with a melt flow rate MFR 2 (230°C) of more than 0.5 g/10min is reacted with a thermally decomposing free radical- forming agent and optionally with a bifunctionally unsaturated monomer obtaining thereby the branched polypropylene, wherein the polypropylene composition has a F 30 melt strength of more than 20.0 cN and a V 30 melt extensibility of more than 200 mm/s.
Abstract:
The present invention relates to a polypropylene composition comprising a branched polypropylene (b-PP) having high melt strength (HMS). Furthermore, the present invention also relates to a method for providing the corresponding polypropylene having composition comprising the branched polypropylene (b-PP)and to a foam with the polypropylene composition comprising the branched polypropylene (b-PP). The branched polypropylene (b-PP)is based on a random copolymer with a small amount of ethylene.
Abstract:
The invention relates to a propylene homopolymer or copolymer having a comonomer in the copolymer selected from ethylene, C 4 -C 20 -alpha olefin, said propylene homopolymer or copolymer being free of phthalic compound. It further relates to a long-chain branched propylene homopolymer or copolymer (b-PP) having a comonomer in the copolymer selected from ethylene, C 4 -C 20 -alpha olefins, said long-chain branched propylene homopolymer or copolymer (b-PP) being free of phthalic compound. As well as their production processes and uses.
Abstract:
The invention relates to a propylene homopolymer or copolymer having a comonomer in the copolymer selected from ethylene, C 4 -C 20 -alpha olefin, said propylene homopolymer or copolymer being free of phthalic compound. It further relates to a long-chain branched propylene homopolymer or copolymer (b-PP) having a comonomer in the copolymer selected from ethylene, C 4 -C 20 -alpha olefins, said long-chain branched propylene homopolymer or copolymer (b-PP) being free of phthalic compound. As well as their production processes and uses.
Abstract:
The present invention relates to a process for providing a polypropylene composition comprising a branched polypropylene (b-PP), a polypropylene composition as well as a film comprising the polypropylene composition.