摘要:
The present invention concerns an improved polyolefin composition containing a heterophasic propylene copolymer, a polymeric nucleating agent and low-density polyethylene.
摘要:
A process for producing terpolymers of propylene, comprising: a) feeding into a slurry reactor a reaction mixture containing 50-85 wt.% of propylene, 1-10 wt.% of ethylene, 15-40 wt.% of another C4-C8 alpha-olefin, a catalyst system maintaining olefin polymerization at said temperature conditions, and optionally hydrogen, b) polymerizing said reaction mixture at a temperature of lower than 70 °C a sufficient time to obtain a propylene terpolymer amounting to 50-99 wt.% of the end product, c) transferring said reaction mixture into a gas phase reactor operating at a pressure of higher than 5 bars, preferably higher than 10 bars, optionally adding 0-30 wt.% of ethylene, 0-10 wt.% of another C4-C8 alpha-olefin, 0-40 wt.% of propylene and optionally hydrogen, and d) continuing polymerization in said gas phase reactor for obtaining a propylene terpolymer amounting to 1-50 wt.% of the end product. The terpolymer has a melting temperature less than 135 °C, preferably less than 132 °C, and it can be used for manufacturing films having good sealing properties.
摘要:
The present invention provides a polyolefin composition comprising: (a) a propylene homopolymer component (A), and (b) a propylene random copolymer component (B) comprising repeating units derived from at least one comonomer selected from the group consisting of ethylene and ±-olefin monomers, wherein the random propylene copolymer component (B) has an MFR2 of from 0.5 to 15, and wherein the propylene homopolymer component (A) may comprise up to 1-wt% of at least one comonomer selected from the group consisting of ethylene and ±-olefin monomers, and wherein the MRF2 ratio of component (A)/component (B) is equal to or greater than 5. The present invention further provides a heterophasic polyolefin composition comprising a mixture of the above polyolefin composition as the matrix phase, and a rubber component dispersed therein.
摘要:
Novel polyolefin compositionscomprising (A) a first propylene-ethylene random copolymerand (B) a second propylene-ethylene random copolymer, wherein the polyolefin composition has an ethylene content CMAB of 1 - 10wt% and an MFR(AB) of 3 - 20g/10 min with the proviso that CMAB > CMA and MFR(A)/MFR(AB) >1.45 and where the polyolefincomposition further has a randomness R of the ethylene distribution in the polymer chain of ≥ 0.945. Articles made from the novel polyolefin compositions have excellent optical properties even after subjecting them to a heat sterilisation step.
摘要:
The present invention provides a polyolefin composition comprising: (a) a propylene homopolymer component (A), and (b) a propylene random copolymer component (B) comprising repeating units derived from at least one comonomer selected from the group consisting of ethylene and α-olefin monomers, wherein the random propylene copolymer component (B) has an MFR2 of from 0.5 to 15, and wherein the propylene homopolymer component (A) may comprise up to 1 -wt% of at least one comonomer selected from the group consisting of ethylene and α-olefin monomers, and wherein the MRF2 ratio of component (A)/component (B) is equal to or greater than 5. The present invention further provides a heterophasic polyolefin composition comprising a mixture of the above polyolefin composition as the matrix phase, and a rubber component dispersed therein.
摘要:
The present invention relates to a heterophasic polypropylene composition with a high melt flow rate for processability, a good stiffness and an improved compression performance. These compositions may be employed for the production of moulded articles, in particular injection moulded articles such as thin- walled plastic cups. Furthermore, the invention relates to a process for preparing the inventive polymer compositions.
摘要:
The invention relates to a process for the preparation of a polypropylene for e.g. pipe applications, containing from 1.0 to 10.0 % by weight of ethylene or C4-C10- alpha -olefin repeating units and having an MFR2 value of between 0.05 and 0.40 g/10 min by polymerizing propylene and ethylene in the presence of a catalyst system. The creep-resistance of the polypropylene is improved by performing the process by means of the following steps: (a) copolymerizing propylene and ethylene into a random copolymer at 40 to 110 DEG C using: a portion of ethylene or C4-C10- alpha -olefin leading to 1.0 to 10.0 % by weight of ethylene repeating units in said random copolymer; and no or a minimal amount of hydrogen leading to an MFR10 value of between 0.01 and 5.0 g/10 min for said random copolymer, if this step is performed first, or to an MFR2 value for said polypropylene of between 0.05 and 0.40 g/10 min, if this step is performed after step (b); the proportion of random copolymer of this step being from 20 to 80 % by weight of said polypropylene, (b) polymerizing propylene at 40 to 110 DEG C using: no or a minimal portion of ethylene leading to 0.0 to 1.0 % by weight of ethylene repeating units in the polymer resulting from this step; and an amount of hydrogen leading to an MFR2 value for said polypropylene of between 0.05 and 0.40 g/10 min, if this step is performed after step (a); the proportion of polymer of this step being from 80 to 20 % by weight of said polypropylene. The polypropylene can be elastomer modified.
摘要:
The invnetion provides a heterophasic propylene polymer composition comprising the following components: i) 60 to 90 % wt, relative to the total weight of components i), ii) and iii), of a propylene polymer matrix comprising a propylene homopolymer and, optionally a propylene copolymer, said propylene polymer matrix having an ethylene content of no more then 5 % wt; ii) 5 to 30 % wt, relative to the total weight of components i), ii) and iii), of an elastomer; and iii) 5 to 25 % wt, relative to the total weight of components i), ii) and iii), of an ethylene copolymer plastomer having a density of not more than 910 kg/m3 and a melt flow rate MFR¿2.16? (190 °C) of at least 0.5 g/10 minutes at 190 °C under a weight of 2.16 kg.
摘要:
Use of a Ziegler-Natta procatalyst which contains a trans-estehfication product of a lower alcohol and a phthalic ester for the production of reactor grade thermoplastic polyolefins with improved paintability, characterized in that the procatalyst used has been prepared by a) reacting a spray crystallized or emulsion solidified adduct of MgCl2 and a C1-C2 alcohol with TiCI4 b) reacting the product of stage a) with a dialkylphthalate of formula (I): wherein R1' and R2' are independently at least a C5 alkyl under conditions where a transesterification between said C1 to C2 alcohol and said dialkylphthalate of formula (I) takes place to form the internal donor c) washing the product of stage b) or d) optionally reacting the product of step c) with TiCI4, as well as reactor grade thermoplastic polyolefins prepared by using the above described Ziegler-Natta procatalyst, use of these reactor grade thermoplastic polyolefins, molded articles produced from them and a method to improve paintability and/or surface quality of reactor grade thermoplastic polyolefin resin articles.
摘要:
Novel polyolefin compositionscomprising (A) a first propylene-ethylene random copolymerand (B) a second propylene-ethylene random copolymer, wherein the polyolefin composition has an ethylene content CMAB of 1 - 10wt% and an MFR(AB) of 3 - 20g/10 min with the proviso that CMAB > CMA and MFR(A)/MFR(AB) >1.45 and where the polyolefincomposition further has a randomness R of the ethylene distribution in the polymer chain of ≥ 0.945. Articles made from the novel polyolefin compositions have excellent optical properties even after subjecting them to a heat sterilisation step.