摘要:
A polymer composition that has a backbone chain; and a plurality of long chain branches connected to the backbone is described. The polymer composition also has a value of 2g′LCB-1g′LCB g′2LCB-g′1LCB that is less than about 0.22, where 1g′LCB g′2LCB is the long chain branching index for a fraction of the composition having a Mw of 100,000 and 2g′LCB g′1LCB is the long chain branching index for a fraction of the composition having a Mw of 500,000.
摘要:
A catalyst composition comprising a zirconium complex of a polyvalent aryloxyether and an alumoxane, polymerization processes employing the same, especially the continuous, solution polymerization of ethylene and one or more C3-30 olefins or diolefins to prepare copolymers having reduced cocatalyst by-product content, are disclosed.
摘要:
Olefin polymers having a melt strength of about 5cN at 190 ° C., and when made into a film have a CD shrink of at least 20%. Some of the polymers have a comb-like structure with at least 0.3 long-chain branches per 1000 carbon atoms are disclosed. Some compositions described herein include a high molecular weight fraction and a low molecular weight fraction wherein the ratio of the molecular weight of the high molecular weight fraction to the molecular weight of the low molecular weight fraction is greater than about 1.3.
摘要:
Polymer blends that exhibit good impact resistance comprise a crystalline polypropylene matrix and a partly crystalline copolymer impact modifier with a molecular weight lower than that of the matrix polymer. The matrix polymer can comprise any crystalline propylene homo- or copolymer. The impact modifying copolymers are characterized as comprising at least about 60 weight percent (wt %) of units derived from propylene and, in certain embodiments, as having at least one, preferably two or more, of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content of the copolymer is at least about 3 wt %, (iii) a skewness index, Six, greater than about −1.20, (iv) a DSC curve with a Tme that remains essentially the same and a Tmax that decreases as the amount of comonomer in the copolymer is increased, and (v) an X-ray diffraction pattern that reports more gamma-form crystals than a comparable copolymer prepared with a Ziegler-Natta (Z-N) catalyst.
摘要翻译:表现出良好抗冲击性的聚合物共混物包括分子量低于基体聚合物的结晶聚丙烯基质和部分结晶共聚物抗冲改性剂。 基质聚合物可以包含任何结晶丙烯均聚物或共聚物。 抗冲击改性共聚物的特征在于包含至少约60重量%(wt%)衍生自丙烯的单元,在某些实施方案中,具有至少一个,优选两个或更多个以下性质:(i) 对应于约14.6和约15.7ppm的区域误差的13 C NMR峰值,大约相等强度的峰值,(ii)当共聚物的共聚单体含量在...时,B值大于约1.4 至少约3重量%,(iii)偏度指数大于约-1.20,(iv)具有基本上保持的T曲线的DSC曲线 相同和最大值随着共聚物中共聚单体的量的增加而减小,和(v)报告比用齐格勒制备的可比共聚物更多的γ型晶体的X射线衍射图 -Natta(ZN)催化剂。
摘要:
Polymer blends that exhibit good impact resistance comprise a crystalline polypropylene matrix and a partly crystalline copolymer impact modifier with a molecular weight lower than that of the matrix polymer. The matrix polymer can comprise any crystalline propylene homo- or copolymer. The impact modifying copolymers are characterized as comprising at least about 60 weight percent (wt %) of units derived from propylene and, in certain embodiments, as having at least one, preferably two or more, of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content of the copolymer is at least about 3 wt %, (iii) a skewness index, Six, greater than about −1.20, (iv) a DSC curve with a Tme that remains essentially the same and a Tmax that decreases as the amount of comonomer in the copolymer is increased, and (v) an X-ray diffraction pattern that reports more gamma-form crystals than a comparable copolymer prepared with a Ziegler-Natta (Z-N) catalyst.
摘要翻译:表现出良好抗冲击性的聚合物共混物包括分子量低于基体聚合物的结晶聚丙烯基质和部分结晶共聚物抗冲改性剂。 基质聚合物可以包含任何结晶丙烯均聚物或共聚物。 抗冲击改性共聚物的特征在于包含至少约60重量%(wt%)衍生自丙烯的单元,在某些实施方案中,具有至少一个,优选两个或更多个以下性质:(i) 对应于约14.6和约15.7ppm的区域误差的13 C NMR峰值,大约相等强度的峰值,(ii)当共聚物的共聚单体含量在...时,B值大于约1.4 至少约3重量%,(iii)偏度指数大于约-1.20,(iv)具有基本上保持的T曲线的DSC曲线 相同和最大值随着共聚物中共聚单体的量的增加而减小,和(v)报告比用齐格勒制备的可比共聚物更多的γ型晶体的X射线衍射图 -Natta(ZN)催化剂。
摘要:
A process of making a polymer is described. The process includes contacting one or more olefinic monomers in the presence of at least a high molecular weight (HMW) catalyst and at least a low molecular weight (LMW) catalyst in a polymerization reactor system; and effectuating the polymerization of the one or more olefinic monomers in the polymerization reactor system to obtain an olefin polymer, wherein the LMW catalyst has an RvL, defined as R v L = [ vinyl ] [ vinyl ] + [ vinylidene ] + [ cis ] + [ trans ] wherein [vinyl] is the concentration of vinyl groups in the olefin polymer produced by the low molecular weight catalyst expressed in vinyls/1,000 carbon atoms; [vinylidene], [cis] and [trans] are the concentration of vinylidene, cis and trans groups in the olefin polymer expressed in the number of the respective groups per 1,000 carbon atoms, of greater than 0.12, and wherein the HMW catalyst has a reactivity ratio, r1 of about 5 or less.
摘要翻译:描述制备聚合物的方法。 该方法包括在聚合反应器系统中在至少一种高分子量(HMW)催化剂和至少一种低分子量(LMW))催化剂的存在下使一种或多种烯属单体接触; 并且在聚合反应器体系中实现一种或多种烯烃单体的聚合以获得烯烃聚合物,其中LMW催化剂具有RvL,定义为R v L = [乙烯基] [乙烯基] + [亚乙烯基] + [顺式] + [反式]其中[乙烯基]是由以乙烯基/ 1,000个碳原子表示的低分子量催化剂制备的烯烃聚合物中乙烯基的浓度; [亚乙烯基],[顺式]和[反式]是烯烃聚合物中每1000个碳原子数目表示的亚乙烯基,顺式和反式基团的浓度大于0.12,并且其中HMW催化剂具有 反应性比例r1约为5或更小。
摘要:
A polymer composition that has a backbone chain; and a plurality of long chain branches connected to the backbone is described. The polymer composition also has a value of 2g′LCB-1g′LCB that is less than about 0.22, where 1g′LCB is the long chain branching index for a fraction of the composition having a Mw of 100,000 and 2g′LCB is the long chain branching index for a fraction of the composition having a Mw of 500,000.
摘要:
Unique copolymers comprising propylene, ethylene and/or one or more unsaturated comonomers are characterized as having: at least one, preferably more than one, of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content of the copolymer is at least about 3 wt %, (iii) a skewness index, Six, greater than about −1.20, (iv) a DSC curve with a Tme that remains essentially the same and a Tmax that decreases as the amount of comonomer in the copolymer is increased, and (v) an X-ray diffraction pattern that reports more gamma-form crystals than a comparable copolymer prepared with a Ziegler-Natta catalyst These polypropylene polymers are made using a nonmetallocene, metal-centered, heteroaryl ligand catalyst. These polymers can be blended with other polymers, and are useful in the manufacture of films, sheets, foams, fibers and molded articles.
摘要:
Fibers comprising a propylene homopolymer or a copolymer of propylene and at least one of ethylene and one or more unsaturated comonomers exhibit desirable properties. The homopolymers are characterized as having 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity. The copolymers are characterized as (A) comprising at least about 60 weight percent (wt %) of units derived from propylene, and (B) having at least one of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content of the copolymer is at least about 3 wt %, (iii) a skewness index, Six, greater than about −1.20, (iv) a DSC curve with a Tme that remains essentially the same and a Tmax that decreases as the amount of comonomer in the copolymer is increased, and (v) an X-ray diffraction pattern that reports more gamma-form crystals than a comparable copolymer prepared with a Ziegler-Natta (Z-N) catalyst.
摘要:
A polymer composition comprises: (a) a high molecular weight, branched component; and (b) a low molecular weight, branched component. Some polymer compositions are characterized by a substantial absent of amyl or methyl branches and a melt strength (MS) that satisfies the following relationship: MS ≥ x I 2 + y where x is greater than or equal to about 12.5 and y is greater than or equal to about 3. Some polymers are characterized by a melt strength (MS) that satisfies the following relationship: MS ≥ x I 2 + y where x is greater than or equal to about 3 and y is greater than or equal to about 4.5 and a molecular weight distribution of greater than 3. A process for making polymers is also disclosed.