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1. 发明申请

WO2009147023A1 POLYMER COMPOSITIONS AND PRESSURE-RESISTANT PIPES MADE THEREFROM 审中-公开
标题翻译：聚合物组合物和耐压管道
公开(公告)号：WO2009147023A1
公开(公告)日：2009-12-10
申请号：PCT/EP2009/056308
申请日：2009-05-25
申请人： BOREALIS AG , BÄCKMAN, Mats , EK, Carl-Gustav , PAKKANEN, Anneli , PALMLÖF, Magnus
发明人： BÄCKMAN, Mats , EK, Carl-Gustav , PAKKANEN, Anneli , PALMLÖF, Magnus
IPC分类号： C08L23/08
CPC分类号： F16L9/12 , C08L23/04 , C08L23/06 , C08L23/0815 , C08L2314/06 , Y10T137/0318 , Y10T428/139 , C08L2666/06
摘要： The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 924 to 935 kg/m 3 , a melt index MFR 5 of from 0.5 to 6.0 g/10 min, a melt index MFR 2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI 2.7/210 of from 2 to 50. In addition the multimodal copolymer comprises: (A) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 945 to 975 kg/m 3 ; and (B) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 929 kg/m 3 .
摘要翻译：本发明涉及适于制造管道的聚合物组合物。组合物包含乙烯和一种或多种具有4至10个碳原子的α-烯烃的多峰共聚物，其中多峰乙烯共聚物的密度为924至935kg / m 3，熔体指数MFR 5为0.5至6.0g / 10分钟，熔体指数MFR 2为0.1至2.0g / 10min，剪切稀化指数SHI2.7 / 210为2至50.此外，多峰共聚物包含：（A）30至70重量％基于组分（A）和（B）的组合量的低分子量乙烯聚合物，其选自乙烯均聚物和乙烯与一种或多种具有4至10个碳原子的α-烯烃的共聚物并具有重均分子量分子量为5000至100000g / mol，密度为945至975kg / m 3; 和（B）30至70重量％，基于组分（A）和（B）的组合量，乙烯和一种或多种具有4至10个碳原子的α-烯烃的高分子量共聚物和重均分子量为100000〜1000000g / mol，密度为890〜929kg / m 3。

2. 发明申请

WO2009147021A1 POLYMER COMPOSITIONS HAVING IMPROVED HOMOGENEITY AND ODOUR, A METHOD FOR MAKING THEM AND PIPES MADE THEREOF 审中-公开
标题翻译：具有改善的均匀性和气味的聚合物组合物，制备它们的管道及其制造方法
公开(公告)号：WO2009147021A1
公开(公告)日：2009-12-10
申请号：PCT/EP2009/056303
申请日：2009-05-25
申请人： BOREALIS AG , BÄCKMAN, Mats , Ek, Carl-Gustav , PAKKANEN, Anneli , PALMLÖF, Magnus
发明人： BÄCKMAN, Mats , Ek, Carl-Gustav , PAKKANEN, Anneli , PALMLÖF, Magnus
IPC分类号： C08L23/00
CPC分类号： C08L23/06 , C08L23/0815 , C08L2205/02 , Y10T428/139 , C08L2666/06
摘要： The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 924 to 960 kg/m 3 , a melt index MFR 5 of from 0.5 to 6.0 g/10 min, a melt index MFR 2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI 27/210 of from 2 to 50. The compositions further have a level of volatile compounds of at most 100 ppm by weight and/or a homogeneity rating of at most 3. In addition the multimodal copolymer comprises: (A) from 35 to 60 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 945 to 975 kg/m 3 ; and (B) from 40 to 65 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 935 kg/m 3 .
摘要翻译：本发明涉及适于制造管道的聚合物组合物。组合物包含乙烯和一种或多种具有4至10个碳原子的α-烯烃的多峰共聚物，其中多峰乙烯共聚物的密度为924至960kg / m 3，熔体指数MFR 5为0.5至6.0g / 10分钟，熔体指数MFR 2为0.1至2.0g / 10min，剪切稀化指数SHI27 / 210为2至50.该组合物还具有至多100重量ppm的挥发性化合物水平和/或均一性等级至多为3.另外，多峰共聚物包含：（A）35至60重量％，基于组分（A）和（B）的组合量，选自乙烯的低分子量乙烯聚合物均聚物和乙烯与一种或多种具有4至10个碳原子的α-烯烃的共聚物，其重均分子量为5000至100000g / mol，密度为945至975kg / m 3; 和（B）40至65重量％，基于组分（A）和（B）的组合量，乙烯和一种或多种具有4至10个碳原子的α-烯烃的高分子量共聚物和重均分子量为100000〜1000000g / mol，密度为890〜935kg / m 3。

3. 发明申请

WO2009147022A1 HIGH DENSITY POLYMER COMPOSITIONS, A METHOD FOR THEIR PREPARATION AND PRESSURE-RESISTANT PIPES MADE THEREFROM 审中-公开
标题翻译：高密度聚合物组合物，其制备和耐压管道的方法
公开(公告)号：WO2009147022A1
公开(公告)日：2009-12-10
申请号：PCT/EP2009/056307
申请日：2009-05-25
申请人： BOREALIS AG , BÄCKMAN, Mats , EK, Carl-Gustaf , PAKKANEN, Anneli , PALMLÖF, Magnus , TURPEINEN, Tarja-Tuulikki , SEVERN, John
发明人： BÄCKMAN, Mats , EK, Carl-Gustaf , PAKKANEN, Anneli , PALMLÖF, Magnus , TURPEINEN, Tarja-Tuulikki , SEVERN, John
IPC分类号： C08L23/08
CPC分类号： F16L9/12 , C08L23/04 , C08L23/06 , C08L23/0815 , C08L2203/18 , C08L2314/06 , Y10T428/139
摘要： The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 937 to 950 kg/m 3 , a melt index MFR 5 of from 0.3 to 3.0 g/10 min, a melt index MFR 2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI 2.7/210 of from 2 to 30. In addition the multimodal copolymer comprises: (A) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 960 to 977 kg/m 3 ; and (B) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 929 kg/m 3 .
摘要翻译：本发明涉及适于制造管道的聚合物组合物。组合物包含乙烯和一种或多种具有4至10个碳原子的α-烯烃的多峰共聚物，其中多峰乙烯共聚物的密度为937至950kg / m 3，熔体指数MFR 5为0.3-3.0g / 10分钟，熔体指数MFR 2为0.1至2.0g / 10min，剪切稀化指数SHI2.7 / 210为2至30.此外，多峰共聚物包含：（A）30至70重量％基于组分（A）和（B）的组合量的低分子量乙烯聚合物，其选自乙烯均聚物和乙烯与一种或多种具有4至10个碳原子的α-烯烃的共聚物并具有重均分子量分子量为5000至100000g / mol，密度为960至977kg / m 3; 和（B）30至70重量％，基于组分（A）和（B）的组合量，乙烯和一种或多种具有4至10个碳原子的α-烯烃的高分子量共聚物和重均分子量为100000〜1000000g / mol，密度为890〜929kg / m 3。

4. 发明申请

WO2008040505A1 POLYETHYLENE COMPOSITION FOR PRESSURE PIPES WITH ENHANCED FLEXIBILITY 审中-公开
标题翻译：用于具有增强柔性的压力管的聚乙烯组合物
公开(公告)号：WO2008040505A1
公开(公告)日：2008-04-10
申请号：PCT/EP2007/008483
申请日：2007-09-28
申请人： BOREALIS TECHNOLOGY OY , BÄCKMAN, Mats , AHLSTRAND, Lars-Erik , HAGSTRAND, Per-Ola , PALMLÖF, Magnus
发明人： BÄCKMAN, Mats , AHLSTRAND, Lars-Erik , HAGSTRAND, Per-Ola , PALMLÖF, Magnus
IPC分类号： F16L9/12 , C08L23/04
CPC分类号： C08L23/04 , C08L23/06 , C08L23/08 , C08L23/0807 , C08L2205/02 , Y10T428/139 , C08L2666/06
摘要： The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A)has a lower weight average molecular weight than fraction (B); (ii) the base resin has a density of 932 to 938 kg/m 3; (iii) the polyethylene composition has an MFR 5 of 0.1 to 0.6 g/10 min; and (iv) the polyethylene composition has a shear stress η2.7 kPa of 85 to 230 kPas. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.
摘要翻译：本发明涉及包含基础树脂的聚乙烯组合物，其包含（a）乙烯均聚物或共聚物部分（A）; 和（b）乙烯均聚物或共聚物部分（B），其中（i）级分（A）具有比级分（B）更低的重均分子量; （ii）基础树脂的密度为932至938kg / m 3;（iii）聚乙烯组合物具有0.1至0.6g / 10min的MFR 5 ; 和（iv）聚乙烯组合物的剪切应力σ2.7kPa为85〜230kPa·s。此外，本发明涉及一种制品，优选包括所述组合物的管和用于生产制品，优选管的所述组合物的用途。

5. 发明申请

WO2008040504A1 POLYETHYLENE COMPOSITION FOR PRESSURE PIPES WITH ENHANCED FLEXIBILITY 审中-公开
标题翻译：用于具有增强柔性的压力管的聚乙烯组合物
公开(公告)号：WO2008040504A1
公开(公告)日：2008-04-10
申请号：PCT/EP2007/008482
申请日：2007-09-28
申请人： BOREALIS TECHNOLOGY OY , BÄCKMAN, Mats , AHLSTRAND, Lars-Erik , HAGSTRAND, Per-Ola , PALMLÖF, Magnus
发明人： BÄCKMAN, Mats , AHLSTRAND, Lars-Erik , HAGSTRAND, Per-Ola , PALMLÖF, Magnus
IPC分类号： F16L9/12 , C08L23/04
CPC分类号： C08L23/04 , C08L23/06 , C08L23/08 , C08L2205/02 , Y10T428/139 , C08L2666/06
摘要： The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A) has a lower average molecular weight than fraction (B); (ii) the base resin has a density of 940 to 947 kg/m 3 ; (iii) the polyethylene composition has an MFR 5 of 0.1 to 0.5 g/10 min; and (iv) the polyethylene composition has an SHI (2.7/210) of 10 to 49. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.
摘要翻译：本发明涉及包含基础树脂的聚乙烯组合物，其包含（a）乙烯均聚物或共聚物部分（A）; 和（b）乙烯均聚物或共聚物部分（B），其中（i）级分（A）的平均分子量低于级分（B）; （ii）基础树脂的密度为940至947kg / m 3; （iii）聚乙烯组合物的MFR 5为0.1至0.5g / 10min; 和（iv）聚乙烯组合物具有10至49的SHI（2.7 / 210）/。此外，本发明涉及一种制品，优选包括所述组合物的管和所述组合物的用途用于制造物品，优选管道。

6. 发明申请

WO2012007082A1 PIPES MADE FROM A POLYETHYLENE COPOLYMER WITH SLOW CRACK GROWTH 审中-公开
标题翻译：来自具有缓慢裂纹增长的聚乙烯共聚物的管道
公开(公告)号：WO2012007082A1
公开(公告)日：2012-01-19
申请号：PCT/EP2011/002614
申请日：2011-05-26
申请人： BOREALIS AG , BÄCKMAN, Mats
发明人： BÄCKMAN, Mats
IPC分类号： C08K5/13 , C08K5/134 , C08L23/08 , C08L23/06
CPC分类号： C08K5/13 , C08K5/1345 , C08L23/04 , C08L23/06 , C08L23/0815 , C08L2205/02 , C08L2666/06 , Y10T428/1397
摘要： The present invention relates to a pipe consisting of a polyethylene composition which comprises - a base resin, comprising • a first ethylene homo- or copolymer (A): and • a second ethylene copolymer (B); and the polyethylene composition further comprises - a phenol-type stabilizer (C); and - a phenol-type stabilizer (D); whereby stabilizers (C) and (D) are different. The present invention is furthermore directed to the use of - a phenol-type stabilizer (C); and - a phenol-type stabilizer (D); whereby stabilizers (C) and (D) are different and, optionally, - a further stabilizer (E) selected from • phosphorous containing stabilizer (E1 ); • sulphur containing stabilizers (E2); • nitrogen containing stabilizers (E3); and/or • mixtures thereof; for increasing the slow crack growth resistance of pipes.
摘要翻译：本发明涉及一种由聚乙烯组合物组成的管，该管包括：基础树脂，其包含第一乙烯均聚物或共聚物（A）;和第二乙烯共聚物（B）; 并且所述聚乙烯组合物还包含 - 酚型稳定剂（C）; 和 - 酚型稳定剂（D）; 由此稳定剂（C）和（D）不同。本发明还涉及苯酚型稳定剂（C）的用途; 和 - 酚型稳定剂（D）; 其中稳定剂（C）和（D）不同，并且任选地，选自含磷磷酸酯稳定剂（E1）的另外的稳定剂（E）; 含硫稳定剂（E2）; 含氮稳定剂（E3）; 和/或其混合物; 用于增加管道的缓慢的裂纹扩展阻力。

7. 发明申请

WO2009080207A1 PROCESS FOR COATING A PIPE WITH HIGH THROUGHPUT USING MULTIMODAL ETHYLENE COPOLYMER, AND COATED PIPES OBTAINED THEREOF 审中-公开
标题翻译：使用多模乙烯共聚物涂覆高通量的管道及其所获得的涂层管道的方法
公开(公告)号：WO2009080207A1
公开(公告)日：2009-07-02
申请号：PCT/EP2008/010442
申请日：2008-12-09
申请人： BOREALIS TECHNOLOGY OY , ANKER, Martin , FREDRIKSEN, Siw, Bodil , BENTZROD, Pal, Christian , BÄCKMAN, Mats , LEIDEN, Leif , VAHTERI, Markku , REKONEN, Petri
发明人： ANKER, Martin , FREDRIKSEN, Siw, Bodil , BENTZROD, Pal, Christian , BÄCKMAN, Mats , LEIDEN, Leif , VAHTERI, Markku , REKONEN, Petri
IPC分类号： C09D123/06 , C08L23/08
CPC分类号： C09D123/06 , C08L23/0815 , C08L2205/025 , C08L2308/00 , C08L2666/06
摘要： The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR 2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR 5 of from 0.5 to 10 g/10 min and a density of from 930 kg/m 3 to 955 kg/m 3 . Further, the multimodal ethylene copolymer comprises the multimodal ethylene copolymer comprises from 49 to 59 % based on the weight of the multimodal ethylene copolymer a low molecular weight ethylene homopolymer component, said low molecular weight ethylene homopolymer having a weight average molecular weight of from 5000 g/mol to 70000 g/mol; and from 51 to 41 % based on the weight of the multimodal ethylene copolymer a high molecular weight ethylene copolymer component, said high molecular weight ethylene copolymer having a weight average molecular weight of from 100000 g/mol to 700000 g/mol. The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.
摘要翻译：本发明涉及具有多峰聚乙烯层的涂覆管。多峰乙烯共聚物是乙烯与一种或多种具有4-10个碳原子的α-烯烃共聚单体的共聚物，其重均分子量为70000g / mol至250000g / mol，重均分子量数均分子量Mw / Mn为15-50，熔体指数MFR2为0.05g / 10min至5g / 10min，熔体指数MFR5为0.5-10g / 10min，密度为930 kg / m3至955 kg / m3。此外，多峰乙烯共聚物包含多峰乙烯共聚物，其包含基于多峰乙烯共聚物的重量的49-59％的低分子量乙烯均聚物组分，所述低分子量乙烯均聚物的重均分子量为5000g / mol至70000g / mol; 和基于多峰乙烯共聚物重量的51至41％的高分子量乙烯共聚物组分，所述高分子量乙烯共聚物的重均分子量为100000g / mol至700000g / mol。管道可以高产量和良好的生产经济性涂层。涂层具有良好的机械性能。

8. 发明申请

WO2007031156A1 PRESSURE PIPE COMPRISING A MULTIMODAL POLYETHYLENE COMPOSITION WITH AN INORGANIC FILLER 审中-公开
标题翻译：含有无机填料的多模聚乙烯组合物的压力管
公开(公告)号：WO2007031156A1
公开(公告)日：2007-03-22
申请号：PCT/EP2006/007667
申请日：2006-08-02
申请人： BOREALIS TECHNOLOGY OY , EK, Carl-Gustaf , BÄCKMAN, Mats
发明人： EK, Carl-Gustaf , BÄCKMAN, Mats
IPC分类号： C08K3/00 , C08L23/04 , C08L23/08 , F16L9/128 , F16L9/12
CPC分类号： C08L23/06 , C08F210/16 , C08L23/0815 , C08L2308/00 , F16L9/12 , Y10T428/13 , Y10T428/1303 , Y10T428/1352 , Y10T428/1359 , Y10T428/139 , C08L2666/06 , C08L2666/04 , C08F210/14 , C08F2500/12 , C08F2500/13 , C08F2500/17
摘要： The present invention relates to a pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises (A) a first ethylene homopolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), and the composition further comprises (C) an inorganic mineral filler, wherein inorganic mineral filler (C) is present in the composition in an amount of 1 to 70 wt.%, and to the use of said composition for the production of a pipe or a supplementary pipe article.
摘要翻译：本发明涉及一种包含聚乙烯组合物的管或辅助管制品，所述聚乙烯组合物包含（A）第一乙烯均聚物部分和（B）第二乙烯均聚物或共聚物部分的基础树脂，其中级分（A）具有比组分（B）低的平均分子量，组合物还包含（C）无机矿物填料，其中组合物中无机矿物填料（C）的含量为1-70重量％，并且使用所述组合物来生产管道或辅助管道制品。

9. 发明申请

WO2007031155A1 PRESSURELESS PIPE COMPRISING A MULTIMODAL POLYETHYLENE COMPOSITION WITH AN INORGANIC FILLER 审中-公开
标题翻译：包含无机填料的多模聚乙烯组合物的无粘性管
公开(公告)号：WO2007031155A1
公开(公告)日：2007-03-22
申请号：PCT/EP2006/007666
申请日：2006-08-02
申请人： BOREALIS TECHNOLOGY OY , EK, Carl-Gustaf , BÄCKMAN, Mats
发明人： EK, Carl-Gustaf , BÄCKMAN, Mats
IPC分类号： C08L23/04 , C08L23/08 , C08K3/00
CPC分类号： C08L23/06 , C08F210/16 , C08L23/0815 , C08L2205/02 , C08L2308/00 , F16L9/12 , Y10T428/1352 , Y10T428/139 , Y10T428/1397 , Y10T428/31855 , C08L2666/04 , C08L2666/06 , C08F210/14 , C08F2500/12 , C08F2500/13 , C08F2500/17
摘要： The present invention relates to a pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), the base resin has a flexural modulus determined according to ISO 178 of 1000 MPa or higher, and the composition further comprises (C) an inorganic mineral filler, wherein inorganic mineral filler (C) is present in the composition in an amount of 1 to 70 wt.%, and to the use of said composition for the production of a pipe or a supplementary pipe article.
摘要翻译：本发明涉及一种包含聚乙烯组合物的管或辅助管制品，所述聚乙烯组合物包含基础树脂，其包含（A）第一乙烯均聚物或共聚物部分，和（B）第二乙烯均聚物或共聚物部分，其中部分 A）具有比分数（B）更低的平均分子量，基础树脂具有根据ISO 178测定的挠曲模量为1000MPa或更高，组合物还包含（C）无机矿物填料，其中无机矿物填料 C）以1至70重量％的量存在于组合物中，以及所述组合物用于生产管或辅助管制品的用途。

10. 发明申请

WO2009080212A1 COATED PIPES HAVING IMPROVED MECHANICAL PROPERTIES AT ELEVATED TEMPERATURES AND A METHOD OF PRODUCTION THEREOF 审中-公开
标题翻译：在高温下具有改进的机械性能的涂层管及其生产方法
公开(公告)号：WO2009080212A1
公开(公告)日：2009-07-02
申请号：PCT/EP2008/010483
申请日：2008-12-10
申请人： BOREALIS TECHNOLOGY OY , ANKER, Martin , FREDRIKSEN, Siw Bodil , BENTZROD, Pal Christian , BÄCKMAN, Mats , LEIDEN, Leif , VAHTERI, Markku , REKONEN, Petri
发明人： ANKER, Martin , FREDRIKSEN, Siw Bodil , BENTZROD, Pal Christian , BÄCKMAN, Mats , LEIDEN, Leif , VAHTERI, Markku , REKONEN, Petri
IPC分类号： C09D123/06 , C09D123/08 , C08L23/08 , C08L23/06
CPC分类号： C09D123/06 , C08L23/06 , C08L23/0815 , C08L2205/025 , C08L2308/00 , C09D123/0815 , Y10T428/1393 , Y10T428/1397 , C08L2666/06
摘要： The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol and a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 945 kg/m3 to 958 kg/m3. The coatings have a high stiffness, good properties at elevated temperatures and acceptable stress-cracking properties.
摘要翻译：本发明涉及具有多峰聚乙烯层的涂覆管。多峰乙烯共聚物是乙烯与一种或多种具有4-10个碳原子的α-烯烃共聚单体的共聚物，其重均分子量为70000g / mol至250000g / mol，熔体指数MFR2为0.05 g / 10分钟至5g / 10min，熔体指数MFR5为0.5至10g / 10min，密度为945kg / m 3至958kg / m 3。涂层具有高刚度，在高温下具有良好的性能和可接受的应力开裂性能。

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