摘要:
Disclosed is a method for viscosity breaking of a polypropylene polymer, a polypropylene copolymer or a polypropylene polymer blend, which process comprises adding a chain transfer agent and an initiator to a polypropylene polymer, polypropylene copolymer or polypropylene polymer blend and heating the resultant composition. The chain transfer agent has a Cs value of greater than or equal to about 0.04 as measured in ethylene polymerization at 130° C. The initiator is for example an organic or inorganic peroxide, a carbon based radical generator, a bis azo compound, a stable nitroxyl compound, a sterically hindered NO-acyl compound or a sterically hindered alkoxyamine compound.
摘要:
Process for producing a propylene homopolymer, a propylene random copolymer or a heterophasic propylene polymer, which process comprises the steps of (a) prepolymerisation, (b) slurry phase polymerisation (c) gas phase polymerisation and optionally (d) one or two further gas phase polymerisation(s), whereby the process is performed in the presence of a catalyst system comprising (x) a Ziegler-Natta procatalyst and (y) an organometallic cocatalyst and (z) an external donor represented by formula (II) and/or (III) Si(OCH2CH3)3(NR1R2) (II) or R3nR4mSi(OR5)z (III) wherein R1 and R2 can be the same or different and represent a hydrocarbon group having 1 to 12 carbon atoms and R3 and R4 can be the same or different and represent a hydrocarbon group having 1 to 12 carbon atoms, R5 is methyl or ethyl, z is 2 or 3, preferably 2, m is 0 or 1, n is 0 or 1, with the proviso that n+m+z=4, the external donor being added in an amount of 3 to 30 wt %, based on the total amount of external donor added, to the prepolymerisation step and in an amount of 70 to 97 wt %, based on the total amount of external donor added, to the slurry polymerisation step.
摘要翻译:制备丙烯均聚物,丙烯无规共聚物或多相丙烯聚合物的方法,该方法包括以下步骤:(a)预聚合,(b)淤浆相聚合(c)气相聚合和任选地(d)一种或两种另外的气体 其中该方法在催化剂体系存在下进行,所述催化剂体系包含(x)齐格勒 - 纳塔前催化剂和(y)有机金属助催化剂和(z)由式(II)表示的外给体和/或 (III)Si(OCH 2 CH 3)3(NR 1 R 2)(II)或R 3 n R 4 m Si(OR 5)z(III)其中R 1和R 2可以相同或不同,表示具有1至12个碳原子的烃基,且R 3和R 4可以 相同或不同,表示具有1至12个碳原子的烃基,R 5是甲基或乙基,z是2或3,优选2,m是0或1,n是0或1,条件是n + + z = 4,外用供体加入量为3〜30重量%,基于加入的外用供体总量, 至预聚合步骤,并且以浆料聚合步骤为基础,以加入的外用供体的总量为70至97重量%的量。
摘要:
Halogen substituted metallocene compounds are described and comprise one or more monocyclic or polycyclic ligands that are pi-bonded to the metal atom and include at least one halogen substituent directly bonded to an sp2 carbon atom at a bondable ring position of the ligand, wherein the or at least one ligand has one or more ring heteroatoms in its cyclic structure. When combined with a suitable activator, these compounds show activity in the polymerization of olefins, such as ethylene and propylene.
摘要:
This invention relates to a vinyl terminated higher olefin copolymer having an Mn of 300 g/mol or more (measured by 1H NMR) comprising: (i) from about 20 to about 99.9 mol % of at least one C5 to C40 higher olefin monomer; and (ii) from about 0.1 to about 80 mol % of propylene; wherein the higher olefin copolymer has at least 40% allyl chain ends. The copolymer may also have an isobutyl chain end to allyl chain end ratio of less than 0.7:1 and/or an allyl chain end to vinylidene chain end ratio of greater than 2:1.
摘要翻译:本发明涉及Mn为300g / mol或更高(通过1 H NMR测量)的乙烯基封端的高级烯烃共聚物,其包含:(i)约20-约99.9mol%的至少一种C 5至C 40高级烯烃单体; 和(ii)约0.1至约80mol%的丙烯; 其中所述较高级烯烃共聚物具有至少40%的烯丙基链端。 该共聚物也可以具有小于0.7:1的异丁基链端与烯丙基链末端比和/或烯丙基链端与亚乙烯基链末端比大于2:1。
摘要:
Preparation of high-reactivity isobutene homo- or copolymers with a content of terminal vinylidene double bonds per polyisobutene chain end of at least 50 mol % by polymerization of isobutene or isobutene-comprising monomer mixtures in the presence of Lewis acids suitable as polymerization catalysts or of complexes which are effective as polymerization catalysts and are formed from Lewis acids and donors, and in the presence of initiators, wherein the initiators used are organic sulfonic acids Z—SO3H in which the variable Z denotes an alkyl radical, haloalkyl radical, cycloalkyl radical, aryl radical or arylalkyl radical.
摘要:
The invention relates to the use of polymers which comprise, in copolymerized form, an α-olefin, at least one alkenyl ester and at least one ester of an α,β-unsaturated carboxylic acid with higher alcohols as an additive for fuel oils and lubricants and especially as a cold flow improver in fuel oils; to the fuel oils and lubricants additized with these polymers; and to additive packages comprising such copolymers. The invention also relates to quaternary and higher copolymers which comprise the abovementioned monomers in copolymerized form.
摘要:
The invention relates to the field of producing polymers and copolymers of olefin oligomers produced by a trimerization reaction of olefin monomers. There is disclosed a process which comprises producing olefin oligomers with the aid of a trimerization catalyst system prepared using UHF irradiation for activating individual components of the trimerization catalyst system. The use of the trimerization catalyst system thus improved and having increased activity provides for increased effectiveness in the production of olefin oligomers from ethylene or other olefin monomers, inter alia, at a low pressure of ethylene. The olefin oligomers thus produced are then polymerized or copolymerized using processes known in the art.The technical effect consists in increasing the effectiveness of the production of olefin oligomers which are then used in a polymerization or copolymerization reaction.
摘要:
This disclosure relates to substantially atactic polymers of at least one of propylene, 1-butene or 1-pentene, processes for making such polymers and compositions including the polymers. The polymers may be used as lubricants or may be combined with low viscosity base stocks to form lubricants. The polymers may be made in the presence of a metallocene catalyst with a non-coordinating anion activator and optionally with hydrogen.
摘要:
Process for producing a multimodal polyethylene in at least two reactors connected in series, in which 20-80 wt % of a first polymer is made in suspension in a first reactor and 80-20 wt % of a second polymer is made in suspension in a second reactor in the presence of the first polymer, and a stream or slurry containing the resulting polymer is withdrawn from the second reactor and transferred to a flash tank operating at a pressure and temperature such that at least 50 mol % of the liquid component of the slurry, or the non-polymer component of the stream entering the flash tank, is withdrawn from the flash tank as a vapour, wherein the concentration in the stream or slurry entering the flash tank of components having a molecular weight below 50 g/mol, Clights (mol %), satisfies the equation Clights
摘要:
Process for producing a multimodal polyethylene in at least two reactors connected in series, in which 20-80 wt % of a high molecular weight (HMW) polymer is made in suspension in a first reactor and 20-80 wt % of a low molecular weight (LMW) polymer is made in suspension in a second reactor in the presence of the HMW polymer, wherein the solids concentration in the second LMW reactor, defined as the mass of polymer divided by the total mass of slurry, is at least 35 wt %, most preferably between 45 wt % and 60 wt %, and/or the ratio of solids concentration in the first reactor to that in the second reactor is maintained at less than 1.0, preferably between 0.6 and 0.8, and further wherein the volume of the second reactor is at least 10%, preferably at least 30% and more preferably at least 50% greater than the volume of the first reactor.