摘要:
Disclosed are thermoplastic elastomeric compositions include: A) from 10 to 80% by weight of one or more crystalline polymer of propylene containing from 0.05 to 15% in moles of ethylenic unsaturation, or a mixture of the above polymer with a saturated thermoplastic olefin polymer in quantities lower than or equal to 80% by weight; B) from 20 to 90% by weight of an unsaturated elastomeric olefin polymer; the compositions having been dynamically cross-linked with a cross-linking agent which includes a free radical generator.
摘要:
Process for the preparation of ethylene copolymers comprising the copolymerization of ethylene with olefins CH2═CHR, in which R is a hydrocarbyl radical with 1-12 carbon atoms carried out in the presence of a catalyst comprising (i) a solid catalyst component comprising Mg, Ti, halogen and specific 1,3-diethers of formula (I) in which R is a C1-C10 hydrocarbon group, R1 is methyl or ethyl, optionally containing a heteroatom, and R2 is a C4-C12 linear alkyl optionally containing a heteroatom, and (ii) an organo-Al compound. The obtained copolymers are endowed with good comonomer distribution.
摘要:
Disclosed are plastic copolymers of propylene with linear dienes having conjugated double bonds, in particular with butadiene, characterized by a molar ratio between the dienic units in configuration 1,2 and those in configuration 1,4 higher than 0.2, preferably higher than 1.Such copolymers are prepared by copolymerization of propylene with linear dienes in the presence of stereospecific catalysts comprising a halogen Ti compound supported on a Mg halide.The copolymers can be reacted with radically polymerizable monomers, thus obtaining functionalized products suited to be transformed into films having good adhesion characteristics.
摘要:
A process for preparing components of catalysts for the polymerization of alpha-olefins and mixtures thereof with ethylene is disclosed. The process comprises reacting a Ti compound having at least oe Ti-halogen linkage with either (1) a mixture of a hydrocarbyl electron-donor compound ED which does not contain active H atoms and an adduct (a) of a Mg dihalide with at least one hydrocarbyl electron-donor compound AH containing active H atoms, or (2) with an adduct (b) of at least a Mg dihalide with a compound AH and ED defined in (1), adducts (a) and (b) being obtained without co-grinding of the Mg dihalide with compounds AH and ED.
摘要:
A polyolefin composition, comprising: (A) from 5 to 95 parts by weight of a crystalline propylene polymer having an isotactic index greater than 80, selected from polypropylene homopolymer and propylene copolymers containing 0.5 to 15 mol % of ethylene and/or an α-olefin having 4 to 10 carbon atoms, and (B) from 5 to 95 parts by weight of an ethylene/α-olefin copolymer containing from 35 to 70% by weight of ethylene, from 30 to 65% by weight of an olefin CH2═CHR, in which R a hydrocarbyl radical with 1-12 carbon atoms, and from 0 to 10% of a polyene characterized by (i) a Molecular Weight Distribution expressed by Mw/Mn of higher than 3, (ii) a content of 2-1 regioinvertions of the α-olefin units of lower than 5% and (iii) a value of Shore A and content by weight of ethylenic units, calculated on the basis of the whole polymer, such that the point defined by such values falls below the curve defined by the following equation: Y=0.0438X2-4.1332X+A where Y is the value of the Shore A, X is the weight percentage of ethylene units in the polymer calculated by NMR and A is 145.
摘要翻译:一种聚烯烃组合物,其包含:(A)5至95重量份的全同立构指数大于80的结晶丙烯聚合物,其选自聚丙烯均聚物和含有0.5至15摩尔%乙烯和/或α-烯烃的丙烯共聚物, 具有4至10个碳原子的烯烃,和(B)5至95重量份的含有35至70重量%乙烯的乙烯/α-烯烃共聚物,30至65重量%的烯烃CH 2, 其中R 1具有1-12个碳原子的烃基和0至10%的多烯,其特征在于(i)由Mw / Mn表示的分子量分布高于3 ,(ii)α-烯烃单元的2-1区域转换的含量低于5%,(iii)肖氏A值和基于整个聚合物计算的烯属单元的重量含量,使得 由这些值定义的点低于由以下等式定义的曲线:<?in-line-formula description =“In-li “公式”end =“lead”?> Y = 0.0438X <2> -4.1332X + A <?in-line-formula description =“In-line Formulas”end =“tail”?> where Y是肖氏A的值,X是通过NMR计算的聚合物中乙烯单元的重量百分比,A是145。
摘要:
Crystalline polymers and copolymers of propylene having total MIL values>2 g/10 minutes, total [η] values in tetrahydronaphthalene at 135° C.≦2.8 dl/g, mW/MN values>20, a fraction insoluble in xylene at 25° C.≧94, and including from 10 to 60% by weight of a fraction (A) having [η]≧2.6, are prepared by way of sequential polymerization in at least two stages, in the presence of a particular Ziegler-Natta catalysts supported on magnesium halides. These polymers have high melt strength, high mechanical properties, and are particularly adequate for the manufacture of articles by using various conversion technologies, such as for example extrusion in thin sheets to be subjected to thermoforming, as well as for injection molding, and blow molding.
摘要:
Elastoplastic polyolefin compositions endowed with high flexibility, comprising:A) 10-50 parts by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer of propylene with ethylene, another .alpha.-olefin, or combinations thereof, which copolymer contains over 85% by weight of propylene;B) 5-20 parts by weight of a copolymer fraction containing ethylene, insoluble in xylene at ambient temperature;C) 40-80 parts by weight of a copolymer fraction of ethylene and propylene or another .alpha.-olefin, or combinations thereof, and, optionally, minor portions of a diene, said fraction containing less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from 1.5 to 4 dl/g; the percent by weight of the sum of the (B) and (C) fractions with respect to the total polyolefin composition being of from 50% to 90% and the (B)/(C) weight ratio being lower than 0.4.
摘要:
Process for the preparation of ethylene copolymers comprising the copolymerization of ethylene with olefins CH2═CHR, in which R is a hydrocarbyl radical with 1-12 carbon atoms carried out in the presence of a catalyst comprising (i) a solid catalyst component comprising Mg, Ti, halogen and specific 1,3-diethers of formula (I) in which R is a C1-C10 hydrocarbon group, R1 is methyl or ethyl, optionally containing a heteroatom, and R2 is a C4-C12 linear alkyl optionally containing a heteroatom, and (ii) an organo-Al compound. The obtained copolymers are endowed with good comonomer distribution.
摘要:
Crystalline polymers and copolymers of propylene having total MIL values>2 g/10 minutes, total [η] values in tetrahydronaphthalene at 135° C.≦2/8 dl/g, Mw/Mn values>20, a fraction insoluble in xylene at 25° C.≧94, and including from 10 to 60% by weight of a fraction (A) having [η]≧2.6, are prepared by way of sequential polymerization in at least two stages, in the presence of particular Ziegler-Natta catalysts supported on magnesium halides. These polymers have high melt strength, high mechanical properties, and are particularly adequate for the manufacture of articles by using various conversion technologies, such as for example extrusion in thin sheets to be subjected to thermoforming, as well as for injection molding, and blow molding.
摘要:
Polyolefin compositions comprising (percent by weight) A) 60%-95% of a crystalline polypropylene component having a Melt Flow Rate (MFRA) value of from 2.5 to 50 g/10 min. and containing from 20% to 80% of a fraction AI) having MFRI from 0.5 to 8 g/10 min., and from 20% to 80% of a fraction AII); B) 5%-40% of a copolymer of ethylene with one or more C4-C10 &agr;-olefin(s) containing from 10 to 40% of said C4-C10 &agr;-olefin(s); the ratio MFRA/MFRI being from 2 to 25; the percentages of A) and B) being referred to the sum of A) and B), and the percentages of AI) and AII) being referred to the sun of AI) and AII).