公开(公告)号：US06194501B1

公开(公告)日：2001-02-27

申请号：US09155053

申请日：1998-09-23

申请人： Keiji Okada ,  Kazuyuki Takimoto ,  Kenichi Morizono

发明人： Keiji Okada ,  Kazuyuki Takimoto ,  Kenichi Morizono

IPC分类号： B65B5302

CPC分类号： C08J5/18 ,  C08F210/02 ,  C08F210/16 ,  C08J2323/08 ,  C08L23/08 ,  C08L23/0838 ,  Y10S526/943 ,  C08F212/00 ,  C08F212/08 ,  C08F2500/17 ,  C08F2500/26 ,  C08F210/14

摘要： Disclosed herein is an olefin copolymer shrink film comprising an &agr;-olefin/aromatic vinyl compound random copolymer. This &agr;-olefin/aromatic vinyl compound random copolymer comprises 99.9 to 58 mol % of structural units derived from ethylene, 0 to 30 mol % of structural units derived from an &agr;-olefin having 3 to 20 carbon atoms (provided that the total of the structural units derived from ethylene and the structural units derived from an &agr;-olefin having 3 to 20 carbon atoms ranges from 99.9 to 88 mol %), and 0.1 to 12 mol % of structural units derived from an aromatic vinyl compound. The &agr;-olefin/aromatic vinyl compound random copolymer has an intrinsic viscosity [&eegr;], as measured in decalin at 135° C., of 0.1 to 10 dl/g and has a melting point, as measured by a differential scanning calorimeter, of 60 to 125° C. The olefin copolymer shrink film is oriented in at least one direction. The olefin copolymer shrink film has excellent low-temperature shrinkability and transparency.

摘要翻译： 本文公开了包含α-烯烃/芳族乙烯基化合物无规共聚物的烯烃共聚物收缩膜。 该α-烯烃/芳族乙烯基化合物无规共聚物包含99.9-58mol％的衍生自乙烯的结构单元，0-30mol％的来自具有3-20个碳原子的α-烯烃的结构单元（条件是 衍生自乙烯的结构单元和衍生自具有3至20个碳原子的α-烯烃的结构单元的范围为99.9至88摩尔％）和0.1至12摩尔％的衍生自芳族乙烯基化合物的结构单元。 α-烯烃/芳族乙烯基化合物无规共聚物在135℃萘烷中测得的特性粘度η为0.1-10dl / g，并且通过差示扫描量热计测得的熔点为 60至125℃。烯烃共聚物收缩膜在至少一个方向上取向。 烯烃共聚物收缩膜具有优异的低温收缩性和透明性。

公开(公告)号：US06300416B1

公开(公告)日：2001-10-09

申请号：US09142863

申请日：1998-09-17

申请人： Keiji Okada ,  Kenichi Morizono ,  Kazuyuki Takimoto ,  Tetsuhiro Matsumoto ,  Masaaki Kawasaki ,  Tetsuo Tojo

发明人： Keiji Okada ,  Kenichi Morizono ,  Kazuyuki Takimoto ,  Tetsuhiro Matsumoto ,  Masaaki Kawasaki ,  Tetsuo Tojo

IPC分类号： C08F800

CPC分类号： C08L21/00 ,  B60C1/0016 ,  B60C1/0025 ,  C08L23/0838 ,  C08L23/16 ,  Y02T10/862 ,  Y10T152/10495 ,  C08L2666/06 ,  C08L2666/04

摘要： A rubber composition useful as a tire side wall or tire tread is formed from an unsaturated olefin copolymer (A) or (A′) and diene rubber (B). Copolymers (A) and (A′) are each obtained from (i) ethylene, (ii) aromatic vinyl compound, (iii) non-conjugated polyene, and, optionally (iv) alpha-olefin having at least 3 carbon atoms. When used in forming a tire side wall, copolymer (A) has a molar ratio of (i)/(iv) from 100/0 to 40/60; molar ratio of [((i)+(iv))/(ii)] from 98/2 to 60/40; an intrinsic viscosity, measured in decalin, at 135° C., from 1.0 to 6.0 dl/g; and iodine value from 10 to 50. For use in tire tread, copolymer (A′), has a molar ratio (i)/(iv) from 100/0 to 40/60; molar ratio [((i)+(iv)):(ii)] from 99/1 to 85/15. The weight ratio (A′)/(B) is from 1/99 to 50/50. The compositions for tire side wall are characterized by excellent strength properties and bending fatigue resistance and low fuel consumption. The compositions for tire tread are characterized by superior strength properties, abrasion resistance and braking performance on wet road (wet ski resistance) and small rolling resistance.

摘要翻译： 可用作轮胎侧壁或轮胎胎面的橡胶组合物由不饱和烯烃共聚物（A）或（A'）和二烯橡胶（B）形成。 共聚物（A）和（A'）各自分别由（i）乙烯，（ii）芳香族乙烯基化合物，（iii）非共轭多烯，和任选地（iv）具有至少3个碳原子的α-烯烃获得。 当用于形成轮胎侧壁时，共聚物（A）的摩尔比为（i）/（iv）为100/0至40/60; [（（i）+（iv））/（ii）]的摩尔比为98/2至60/40; 在135℃下，在萘烷中测定的特性粘度为1.0至6.0dl / g; 并且碘值为10至50.对于轮胎胎面使用共聚物（A'），摩尔比（i）/（iv）为100/0至40/60; 摩尔比[（（i）+（iv））:( ii）]从99/1至85/15。 重量比（A'）/（B）为1/99至50/50。 用于轮胎侧壁的组合物的特征在于优异的强度性能和抗弯曲疲劳性和低燃料消耗。 用于轮胎胎面的组合物的特征在于在湿路面上具有优异的强度性能，耐磨性和制动性能（湿滑雪性能）和小的滚动阻力。

公开(公告)号：US6015625A

公开(公告)日：2000-01-18

申请号：US155208

申请日：1998-09-24

申请人： Kenichi Morizono ,  Keiji Okada ,  Hiromi Shigemoto ,  Hideshi Kawachi

发明人： Kenichi Morizono ,  Keiji Okada ,  Hiromi Shigemoto ,  Hideshi Kawachi

IPC分类号： B32B27/08 ,  B32B27/28 ,  B32B27/36 ,  C08L23/08 ,  C09J123/08 ,  C09J151/00 ,  C09J151/06 ,  B32B27/00

CPC分类号： C09J151/06 ,  B32B27/08 ,  B32B27/28 ,  B32B27/36 ,  C09J123/0815 ,  C09J151/00 ,  C09J151/003 ,  C08L2205/03 ,  C08L23/0815 ,  C08L23/0853 ,  Y10T428/24942 ,  Y10T428/2878 ,  Y10T428/31507 ,  Y10T428/31797 ,  Y10T428/31855

摘要： An adhesive resin composition contains at least a partially or wholly graft-modified .alpha.-olefin/aromatic vinyl compound random copolymer having a graft quantity of an unsaturated carboxylic acid or its derivative ranging from 0.01 to 30% by weight. A laminate comprises (I) a polyester resin layer or a polycarbonate layer, (II) an adhesive layer formed from the above-mentioned adhesive resin composition and (III) a saponified olefin/vinyl acetate copolymer layer. The adhesive resin composition is free from lowering of adhesive strength even when contacted with, for example, hot water. The laminate has excellent gas barrier properties and is capable of being subjected to retorting treatment.

摘要翻译： PCT No.PCT / JP98 / 00213 Sec。 371日期：1998年9月24日 102（e）1998年9月24日PCT 1998年1月27日PCT PCT。 出版物WO98 / 32809 日期1998年7月30日粘合性树脂组合物含有至少部分或全部接枝改性的α-烯烃/芳香族乙烯基化合物无规共聚物，其接枝量为不饱和羧酸或其衍生物的0.01〜30重量％。 层压体包括（I）聚酯树脂层或聚碳酸酯层，（II）由上述粘合剂树脂组合物形成的粘合层和（III）皂化的烯烃/乙酸乙烯酯共聚物层。 粘合剂树脂组合物即使在与例如热水接触时也不会降低粘合强度。 该层压体具有优异的阻气性能，并能进行蒸煮处理。

公开(公告)号：US06310164B1

公开(公告)日：2001-10-30

申请号：US09118901

申请日：1998-07-20

申请人： Kenichi Morizono ,  Keiji Okada ,  Masayoshi Yamaguchi

发明人： Kenichi Morizono ,  Keiji Okada ,  Masayoshi Yamaguchi

IPC分类号： C08F23604

CPC分类号： C08F210/18 ,  C08F4/65908 ,  C08F4/65912 ,  C08F4/65927 ,  C08F210/00 ,  C08F210/02 ,  C08F4/6592 ,  C08F236/06 ,  C08F212/04 ,  C08F2500/03 ,  C08F2500/17 ,  C08F210/06 ,  C08F236/08

摘要： Unsaturated copolymer which is a copolymer of an &agr;olefin of 2 to 12 carbon atoms and a conjugated diene monomer represented by the following formula (I-a) and has the properties: (a) in said copolymer, 1,2-addition units (including 3,4-addition units) derived from the conjugated diene monomer (I-a) form double bonds in the side chain of the copolymer, 1,4-addition units derived from the conjugated diene monomer (I-a) form double bonds in the main chain of the copolymer, and the quantity ratio of the double bonds of the side chain derived from the 1,2-addition units to the double bonds of the main chain derived from the 1,4-addition units (side chain double bonds derived from 1,2-addition units/main chain double bonds derived from 1,4-addition units) is in the range of 10/90 to 99/1 (b) five-membered rings are present in the main chain of said copolymer; and (c) the quantity ratio of the double bonds from all of the addition units to the five-membered rings (total of double bonds from all addition units/five-membered rings) is in the range of 20/80 to 90/10; wherein R2 is a hydrogen atom, an alkyl group of 1 to 8 carbon atoms or an aryl group.

摘要翻译： 不饱和共聚物，其为2至12个碳原子的α-烯烃和由下式（Ia）表示的共轭二烯单体的共聚物，并具有以下性质：（a）在所述共聚物中，1,2-加成单元（包括3， 衍生自共轭二烯单体（Ia）的4-加成单元）在共聚物的侧链中形成双键，衍生自共轭二烯单体（Ia）的1,4-加成单元在共聚物的主链中形成双键 ，并且衍生自1,2-加成单元的侧链的双键与由1,4-加成单元衍生的主链的双键的量比（来自1,2-加成单元的侧链双键） 加成单元/衍生自1,4-加成单元的主链双键）在10/90至99/1的范围内（b）在所述共聚物的主链中存在五元环; 和（c）从所有加成单元到五元环的双键的数量比（来自所有加成单元/五元环的双键的总数）在20/80至90/10的范围内 其中R 2为氢原子，1〜8个碳原子的烷基或芳基。

公开(公告)号：US6143827A

公开(公告)日：2000-11-07

申请号：US118819

申请日：1998-07-20

申请人： Kenichi Morizono ,  Keiji Okada ,  Masayoshi Yamaguchi

发明人： Kenichi Morizono ,  Keiji Okada ,  Masayoshi Yamaguchi

IPC分类号： C08L23/02 ,  C08L23/16 ,  C08F8/00

CPC分类号： C08L23/02 ,  C08L23/16

摘要： Disclosed is an olefin thermoplastic elastomer composition obtained by dynamically heat treating, in the presence of an organic peroxide, a blend comprising 10 to 60 parts by weight of a crystalline polyolefin resin (A) and 40 to 90 parts by weight of an unsaturated olefin copolymer (B) of at least one .alpha.-olefin of 2 to 20 carbon atoms, a conjugated diene monomer represented by the following formula (I), and optionally, an aromatic vinyl compound, the total amount of said components (A) and (B) being 100 parts by weight; ##STR1## wherein R.sup.1 and R.sup.2 are each independently a hydrogen atom, an alkyl group of 1 to 8 carbon atoms or an aryl group, and at least one of R.sup.1 and R.sup.2 is a hydrogen atom. The composition has excellent moldability and can provide a molded product having excellent elastomeric properties, tensile strength properties and appearance.

摘要翻译： 公开了一种烯烃热塑性弹性体组合物，其通过在有机过氧化物的存在下动态热处理包含10至60重量份的结晶聚烯烃树脂（A）和40至90重量份的不饱和烯烃共聚物 （B）至少一种2-20个碳原子的α-烯烃，由下式（I）表示的共轭二烯单体和任选的芳族乙烯基化合物，所述组分（A）和（B ）为100重量份; 其中R 1和R 2各自独立地为氢原子，1至8个碳原子的烷基或芳基，并且R 1和R 2中的至少一个为氢原子。 该组合物具有优异的成型性，并且可以提供具有优异的弹性，拉伸强度和外观的成型体。

公开(公告)号：US06462136B1

公开(公告)日：2002-10-08

申请号：US09582274

申请日：2000-06-23

申请人： Junji Saito ,  Keiji Okada ,  Kenichi Morizono ,  Makoto Mitani ,  Terunori Fujita

发明人： Junji Saito ,  Keiji Okada ,  Kenichi Morizono ,  Makoto Mitani ,  Terunori Fujita

IPC分类号： C08L2308

CPC分类号： C08L23/04 ,  C08F210/16 ,  C08L23/0815 ,  C08L23/10 ,  C08L2314/06 ,  C08F4/64048 ,  C08L2666/04 ,  C08F210/06 ,  C08F2500/17 ,  C08F2500/03 ,  C08F2500/19 ,  C08F2500/20 ,  C08F210/08 ,  C08F4/64189 ,  C08F4/68

摘要： The present invention is intended to provide an ethylene copolymer having excellent mechanical properties and moldability, a process for preparing the copolymer, a resin composition containing the copolymer and uses thereof. The ethylene copolymer has the following properties: the copolymer comprises 90 to 99% by mol of ethylene constituent units and 1 to 60% by mol of C3-20 &agr;-olefin constituent units; the ratio (Mz/Mw) of a Z average molecular weight (Mz) to a weight-average molecular weight (Mw), each molecular weight being measured by GPC, is in the range of 10 to 30, and said ratio (Mz/Mw) and the ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn), each molecular weight being measured by GPC, satisfy the relation (Mz/Mw)>(Mw/Mn); the intrinsic viscosity is in the range of 0.5 to 9 dl/g; the ratio (n*0.01/n*8) of a melt viscosity (&eegr;*0.01) at a shear rate of 0.01 rad/sec, as measured at 190° C., to a melt viscosity (&eegr;*8) at a shear rate of 8 rad/sec, as measured at 190° C., and the intrinsic viscosity (&eegr;) satisfy the relation (&eegr;*0.01/&eegr;*8)≧0.893×(&eegr;)+1.0; and the absolute value of an activation energy (Ea) of a shift factor of melt viscoelasticity is not more than 4×104 J/mol.K.

摘要翻译： 本发明旨在提供具有优异的机械性能和成型性的乙烯共聚物，制备共聚物的方法，含有该共聚物的树脂组合物及其用途。 乙烯共聚物具有以下性质：共聚物包含90-99摩尔％的乙烯构成单元和1至60摩尔％的C 3-20α-烯烃构成单元; 通过GPC测定的各分子量的Z平均分子量（Mz）与重均分子量（Mw）的比（Mz / Mw）在10〜30的范围内，所述比例（Mz / Mw）和通过GPC测定的各分子量的重均分子量（Mw）与数均分子量（Mn）的比（Mw / Mn）满足关系式（Mz / Mw）>（Mw / Mn）; 特性粘度在0.5〜9dl / g的范围内; 在190℃下，剪切速率为0.01rad / sec的熔体粘度（η* 0.01）与剪切时的熔体粘度（ηa* 8）的比（n * 0.01 / n * 8） 速度为8rad / sec，在190℃下测定，特性粘度（eta）满足关系式（eta * 0.01 / eta * 8）> = 0.893x（eta）+1.0; 熔体粘弹性变化系数的活化能（Ea）的绝对值不大于4×104J / mol·K。

公开(公告)号：US06235818B1

公开(公告)日：2001-05-22

申请号：US09355504

申请日：1999-07-29

申请人： Kenichi Morizono ,  Keiji Okada ,  Suguru Tokita

发明人： Kenichi Morizono ,  Keiji Okada ,  Suguru Tokita

IPC分类号： C09J12308

CPC分类号： C09J153/025 ,  C08L23/06 ,  C08L23/0838 ,  C08L53/02 ,  C08L91/06 ,  C08L2666/02 ,  C08L2666/04 ,  C08L2666/24 ,  C08L2666/28 ,  C09J109/06 ,  C09J123/0838 ,  C09J125/02 ,  C09J125/08 ,  C09J151/06 ,  C09J153/00 ,  C09J153/005 ,  C09J153/02 ,  Y10S526/935

摘要： A hot melt adhesive composition exhibiting excellent adhesive strength and which is useful as an adhesive for styrene resins contains (B) tackifier and (C) ethylene/C3-C20 &agr;-olefin/aromatic vinyl compound random copolymer and, in some embodiments also (A) base polymer, such as polyolefin, polar group-containing polymer and aromatic vinyl compound/conjugated diene copolymer. A low molecular weight polyolefin may also be included in all embodiments. The randon copolymer (C) may be prepared by polymerizing the &agr;-olefin and aromatic vinyl compound in the presence of a metallocene containing catalyst. In addition to excellent adhesive strength the hot melt adhesives have improved workability.

摘要翻译： 显示优异的粘合强度并且可用作苯乙烯树脂的粘合剂的热熔粘合剂组合物包含（B）增粘剂和（C）乙烯/ C 3 -C 20α-烯烃/芳族乙烯基化合物无规共聚物，并且在一些实施方案中还包括（A ）基聚合物，例如聚烯烃，含极性基团的聚合物和芳族乙烯基化合物/共轭二烯共聚物。 在所有实施方案中也可以包括低分子量聚烯烃。 兰登共聚物（C）可以通过在含金属茂催化剂的存在下聚合α-烯烃和芳族乙烯基化合物来制备。 除了优异的粘合强度之外，热熔粘合剂具有改进的可加工性。

公开(公告)号：US06218469B1

公开(公告)日：2001-04-17

申请号：US09118379

申请日：1998-07-17

申请人： Kenichi Morizono ,  Keiji Okada ,  Masayoshi Yamaguchi

发明人： Kenichi Morizono ,  Keiji Okada ,  Masayoshi Yamaguchi

IPC分类号： C08L5300

CPC分类号： C08L21/00 ,  C08L23/0815 ,  C08L23/083 ,  C08L23/0838 ,  C08L23/16 ,  C08L2666/06 ,  C08L2666/04

摘要： Disclosed is an unsaturated elastomer composition comprising (A) an unsaturated olefin copolymer of at least one &agr;-olefin of 2 to 20 carbon atoms, a conjugated diene monomer represented by the following formula (I), and optionally, an aromatic vinyl compound, and (B) at least one rubber selected from a diene rubber and an ethylene/&agr;-olefin/nonconjugated polyene copolymer rubber, a weight ratio of said component (A) to said component (B) ((A)/(B)) being in the range of 1/99 to 99/1; wherein R1 and R2 are each independently a hydrogen atom, an alkyl group of 1 to 8 carbon atoms or an aryl group, and at least one of R1 and R2 is a hydrogen atom. From the composition, a vulcanized product excellent in vibration damping properties, vibration insulation properties and strength properties as well as in heat resistance, weathering resistant, ozone resistance and dynamic fatigue resistance can be obtained.

摘要翻译： 公开了一种不饱和弹性体组合物，其包含（A）至少一种2至20个碳原子的不饱和烯烃共聚物，由下式（I）表示的共轭二烯单体和任选的芳族乙烯基化合物，和 （B）选自二烯橡胶和乙烯/α-烯烃/非共轭多烯共聚物橡胶中的至少一种橡胶，所述组分（A）与所述组分（B）（（A）/（B））的重量比为 在1/99至99/1的范围内;其中R1和R2各自独立地为氢原子，1至8个碳原子的烷基或芳基，并且R 1和R 2中的至少一个为氢原子。 通过该组合物，可以获得耐振性，隔振性和强度性以及耐热性，耐候性，耐臭氧性和动态抗疲劳性优异的硫化产品。

公开(公告)号：US06214779B1

公开(公告)日：2001-04-10

申请号：US09101335

申请日：1998-07-07

申请人： Ryousuke Kaneshige ,  Hideki Hirano ,  Masahide Tanaka ,  Kenichi Morizono ,  Keiji Okada

发明人： Ryousuke Kaneshige ,  Hideki Hirano ,  Masahide Tanaka ,  Kenichi Morizono ,  Keiji Okada

IPC分类号： C10M10102

CPC分类号： C10L10/08 ,  C08L23/0815 ,  C08L91/00 ,  C10L1/165 ,  C10M107/02 ,  C10M107/12 ,  C10M143/00 ,  C10M143/10 ,  C10M2205/00 ,  C10M2205/02 ,  C10M2205/0206 ,  C10M2205/04 ,  C10M2205/043 ,  C08L2666/02

摘要： The present invention is directed towards a lubricating oil comprising a random copolymer of an &agr;-olefin/aromatic vinyl compound, wherein the copolymer has a viscosity falling within a specific range and comprises ethylene, an aromatic vinyl compound, and optionally an &agr;-olefin. The lubricating oil possesses excellent viscosity properties, thermal stability, oxidation stability, abrasion resistance, and compatibility with lubricating oil additives. The random copolymer having a different viscosity range is useful as a viscosity index improver and a compatibilizing agent for a lubricating oil. The invention also provides a lubricating oil composition comprising a base oil and the viscosity index improver or the compatibilizing agent. The invention further provides a fuel oil composition comprising a fuel oil fluidity improver based on the above random copolymer having a different viscosity range and a middle fraction fuel oil having a boiling point of 150 to 400° C. The fuel oil composition prevents an increase in viscosity of the middle fraction fuel oil, lowers the clogging point and the flow point in a low-temperature filter, and inhibits the abrasion of a fuel jet nozzle.

摘要翻译： 本发明涉及包含α-烯烃/芳族乙烯基化合物的无规共聚物的润滑油，其中所述共聚物的粘度落在特定范围内并且包含乙烯，芳族乙烯基化合物和任选的α-烯烃。 润滑油具有优异的粘度性能，热稳定性，氧化稳定性，耐磨性和与润滑油添加剂的相容性。 具有不同粘度范围的无规共聚物可用作粘度指数改进剂和润滑油相容剂。 本发明还提供一种包含基础油和粘度指数改进剂或相容剂的润滑油组合物。 本发明还提供了一种燃料油组合物，其包含基于上述具有不同粘度范围的无规共聚物的燃料油流动性改进剂和沸点为150-400℃的中间馏分燃料油。燃料油组合物防止了 中间馏分燃料油的粘度降低低温过滤器中的堵塞点和流动点，并且抑制燃料喷嘴的磨损。

公开(公告)号：US06914112B2

公开(公告)日：2005-07-05

申请号：US10030383

申请日：2001-05-15

申请人： Ryoji Mori ,  Kouichi Kizu ,  Keiji Okada ,  Kazuyuki Takimoto

发明人： Ryoji Mori ,  Kouichi Kizu ,  Keiji Okada ,  Kazuyuki Takimoto

IPC分类号： C08F210/02 ,  C08L23/04 ,  C08L23/08 ,  C08L23/10 ,  C08F232/00

CPC分类号： C08L23/04 ,  C08F210/02 ,  C08L23/08 ,  C08L23/0815 ,  C08L23/0823 ,  C08L23/10 ,  C08L2203/02 ,  Y10S526/916 ,  C08L2666/04

摘要： An ethylene-based copolymer is useful as a modifier for resins, e.g., polypropylene, and can be used in an ethylene/α-olefin copolymer composition containing the same ethylene-based copolymer. The inventive copolymer is characterize by: (a-1) having temperature (Tm) at the maximum peak in the endothermic curve, measured by a differential scanning calorimeter (DSC), of 40 to 90° C., (a-2) containing the component soluble in decane at normal temperature at 1 to 70% b weight, and (a-3) containing the component soluble in decane at normal temperature which comprises (i) a recurring unit derived from ethylene and (ii) a recurring unit derived from an α-olefin of 4 or more carbon atoms, and in which a content of (i) the recurring unit derived from ethylene is 50 to 75% by mole.

摘要翻译： 基于乙烯的共聚物可用作树脂例如聚丙烯的改性剂，并且可用于含有相同乙烯类共聚物的乙烯/α-烯烃共聚物组合物中。 本发明的共聚物的特征在于：（a-1）在差示扫描量热计（DSC）测定的吸热曲线中的最大峰值温度（Tm）为40〜90℃，（a-2）含有 在常温下可溶于癸烷的组分为1-70％b重量，和（a-3），其含有在常温下可溶于癸烷的组分，其包含（i）衍生自乙烯的重复单元和（ii）衍生的重复单元 来自碳原子数为4以上的α-烯烃，（i）来自乙烯的重复单元的含量为50〜75摩尔％。