Abstract:
A coating composition, a process for producing it and substrate coated therewith are described. The composition comprises a multimodal ethylene polymer, which contains from 80 to 99.8% by weight of ethylene repeating units and from 0.2 to 20% by weight of C3-C20 α-olefin repeating units, and is a blend of at least a first and a second ethylene polymer prepared by polymerization in the presence of a single site catalyst system.The blend has a density of 0.915-0.955 g/cm3, a melt flow rate, MFR2, of 0.028-1.5 g/10 min., a molecular weight distribution, Mw/Mn, of 3-10, and a CTL 5.0 MPa-value according to ISO 6259 of at least 500 hrs.
Abstract:
The present invention concerns nucleated propylene polymers having a xylene soluble fraction at 23° C. of less than 2.5%, a crystallization temperature of over 124 ° C. and a tensile modulus of greater than 2,000 MPa. These polymers can be prepared by nucleating a propylene polymer with a polymeric nucleating agent containing vinyl compound units, and by polymerizing propylene optionally with comonomers in the presence of a Ziegler-Natta catalyst system primarily transesterified with a phthalic acid ester—a lower alcohol pair to provide said propylene polymer. The catalyst contains a strongly coordinating external donor.
Abstract:
A coating composition, a process for producing it and substrate coated therewith are described. The composition comprises a multimodal ethylene polymer, which contains from 80 to 99.8% by weight of ethylene repeating units and from 0.2 to 20% by weight of C3-C20 α-olefin repeating units, and is a blend of at least a first and a second ethylene polymer that are obtainable by a process comprising at least two steps in which: said first ethylene polymer is prepared by polymerising ethylene and optional comonomer(s) in the presence of a single site catalyst system; and said second ethylene polymer is prepared by polymerising ethylene and optional comonomer(s) in the presence of a single site catalyst system; said steps being performed in any order and the ethylene polymer of each step being present in the following step(s), and producing a blend of from 20 to 80% by weight of said first and from 80 to 20% by weight of said second ethylene polymer, said blend having a density of 0.915-0.955 g/cm3, a melt flow rate, MFR2, of 0.028-1.5 g/10 min., a molecular weight distribution, Mw/Mn, of 3-10, and a CTL 5.0 MPa-value according to ISO 6259 of at least 500 hrs. The substrate coated with the coating composition preferably is a metal pipe.
Abstract translation:描述了涂料组合物,其制备方法和涂覆的基材。 该组合物包含多峰乙烯聚合物,其含有80至99.8重量%的乙烯重复单元和0.2至20重量%的C 3 -C 20亚甲基 烯属重复单元,并且是至少第一和第二乙烯聚合物的共混物,其可通过包含至少两个步骤的方法获得,其中:所述第一乙烯聚合物通过聚合乙烯和任选的共聚单体 存在单一位点催化剂体系; 并且所述第二乙烯聚合物通过在单位点催化剂体系的存在下聚合乙烯和任选的共聚单体来制备; 所述步骤以任何顺序进行,并且每个步骤的乙烯聚合物存在于以下步骤中,并产生20-80重量%的所述第一和80至20重量%的所述第二个 乙烯聚合物,所述共混物的密度为0.915-0.955g / cm 3,熔体流动速率MFR 2为0.028-1.5g / 10min,a 3-10的分子量分布,M w / M n n,以及根据ISO 6259的CTL5.0MPa值至少为500小时。 涂覆有涂料组合物的基材优选为金属管。