5results about How to "High isotacticity" patented technology

The application relates to the field of high polymer materials, and discloses a 4-methyl-1-pentene homopolymer as well as a preparation method and application thereof. The isotacticity of the 4-methyl-1-pentene homopolymer is greater than or equal to 98%, the flexural modulus is greater than 1100 MPa, and the tensile modulus is greater than 1500 MPa. The 4-methyl-1-pentene homopolymer has the advantages of high isotacticity and good rigidity.

The invention relates to the field of propylene polymerization, and discloses a preparation method of polypropylene, polypropylene and application. The method comprises the following steps: S1, in the presence of a functional external electron donor and a catalyst system, carrying out a prepolymerization reaction on propylene to obtain a prepolymer A; the prepolymerization multiplying power is 1000 to 10000 times; s2, in the presence of a first molecular weight regulator, a first external electron donor and the prepolymer A, performing a first polymerization reaction on propylene to obtain a polymer B; s3, in the presence of a second molecular weight regulator, a second external electron donor and a polymer B, carrying out propylene second polymerization reaction to obtain polypropylene. According to the method, the prepolymerization reaction is combined with the polymerization reaction of two stages, the functional external electron donor is introduced in the prepolymerization process, and the specific first external electron donor and the specific second external electron donor are subsequently matched, so that the prepared polypropylene has good processability and heat resistance.

The invention provides a catalyst component for olefin polymerization, a catalyst and application thereof. The catalyst component is prepared from the following components: Mg, Ti, halogen and a 2, 6-disubstituted oxymethyl-4-pyrone internal electron donor, wherein the 2, 6-disubstituted oxymethyl-4-pyrone internal electron donor has a structure as shown in a formula I: # imgabs0, the catalytic activity of the catalyst component and the catalyst is high and is generally higher than that of phthalate and diether internal electron donor catalysts commonly used in industry, and a polymer obtained through catalytic polymerization is regular in particle size, high in stacking density and good in stability. The isotacticity is high, and the overall molecular weight distribution is narrower.

The invention relates to an ether ester compound, and particularly discloses an ether ester compound as well as a preparation method and application thereof in olefin polymerization. The ether ester compound is shown as a formula M, wherein R1 is selected from hydrogen or C1-C18 alkyl; r2 is selected from alkyl groups of C1 to C18; r is selected from C1-C18 alkyl groups, C6-C30 aryl groups containing or not containing substituent groups, C7-C30 aralkyl groups containing or not containing substituent groups, and C5-C30 cycloalkyl groups containing or not containing substituent groups. The ether ester compound can be applied to olefin polymerization reaction, for example, as an internal electron donor of an olefin polymerization catalyst. The ether ester compound provided by the invention can be prepared from cheap and easily available raw materials, and the preparation method is simple and mild in conditions. The catalyst using the ether ester compound shows higher activity in propylene polymerization reaction, and the obtained polymer has higher isotactic index. # imgabs0 #

The invention discloses a chiral bridged metallocene compound as well as a preparation method and application thereof, and the chiral bridged metallocene compound is characterized in that the chiral bridged metallocene compound has a general formula (I): wherein R1 is selected from 4-substituted phenyl; r2 is selected from alkyl; m is selected from one of Ti, Zr and Hf; x is selected from halogen. The catalyst prepared from the chiral bridged metallocene compound has better catalytic activity, the melt index and isotacticity of synthesized polypropylene are improved, and a polypropylene material with better fluidity can be obtained.