Heterophasic polypropylene composition with high flowability and stiffness in combination with good impact performance and its use.

A composition is described comprising semicrystalline polylactic acid polymer; polyvinyl acetate polymer having a glass transition temperature (Tg) of at least 25 C; plasticizer; and optionally amorphous polylactic acid polymer. In another embodiment the composition further comprises nucleating agent. Also described are films comprising the composition as well as articles, such as a tape or sheet, comprising the film described herein and a layer of pressure sensitive adhesive disposed on the film.

A polyethylene homopolymer composition comprises: a first ethylene homopolymer having a density, d.sup.1 of from 0.930 to 0.975 g/cm.sup.3, a melt index, I.sub.2.sup.1 of from 0.01 to 10 g/10 min, and a molecular weight distribution, Mw/Mn of less than 2.5; and a second ethylene homopolymer having a density, d.sup.2 of from 0.945 to 0.980 g/cm.sup.3, a melt index, I.sub.2.sup.2 of at least 1.0 g/10 min, and a molecular weight distribution, M.sub.w/M.sub.n of less than 2.5; wherein melt index, I.sub.2.sup.2 of the second ethylene homopolymer is greater than the melt index, I.sub.2.sup.1 of the first ethylene homopolymer. The polyethylene homopolymer compositions which may be nucleated have a weight average molecular weight, M.sub.w of 75,000, a molecular weight distribution, M.sub.w/M.sub.n of less than 4.0 and may be usefully employed in molding applications, such as, for example, in compression molded closures.

The present invention provides polyethylene-based compositions suitable for packaging applications, films, and articles. In one aspect, a polyethylene-based composition suitable for packaging applications comprises (a) at least 97% by weight, based on the total weight of the polyethylene-based composition, of a polyethylene composition comprising: (i) from 25 to 37 percent by weight of a first polyethylene fraction having a density in the range of 0.935 to 0.947 g/cm.sup.3 and a melt index (I.sub.2) of less than 0.1 g/10 minutes; and (ii) from 63 to 75 percent by weight of a second polyethylene fraction; and (b) 90 to 540 ppm, based on the total weight of the polyethylene-based composition of a calcium salt of 1,2-cyclohexanedicarboxylic acid; wherein the polyethylene composition has less than 0.10 branches per 1,000 carbon atoms when measured using .sup.13C NMR, wherein the density of the polyethylene-based composition N is at least 0.965 g/cm.sup.3, and wherein the melt index (I.sub.2) of the polyethylene-based composition is 0.5 to 10 g/10 minutes.

A composition is described comprising semicrystalline polylactic acid polymer; polyvinyl acetate polymer having a glass transition temperature (Tg) of at least 25° C.; plasticizer; and optionally amorphous polylactic acid polymer. In another embodiment the composition further comprises nucleating agent. Also described are films comprising the composition as well as articles, such as a tape or sheet, comprising the film described herein and a layer of pressure sensitive adhesive disposed on the film.

A dielectrically-enhanced polyethylene formulation made from (A) a polyethylene-nucleation agent, a dielectrically-enhanced (B) a multimodal ultra-high density polyethylene (multimodal uHDPE) composition, and, optionally, (C) a low density polyethylene (LDPE) polymer. A method of making same, an insulated electrical device comprising same, and a method of using same.

A composition includes (A) 30-95 wt % of a random or homogeneous propylene-based interpolymer having: (i) a comonomer content of at least one of C.sub.2 and C.sub.4-10 α-olefins of 7 wt % to 49 wt % based on the total weight of the propylene-based interpolymer, (ii) a density of 0.90 g/cc or less, and (iii) an MFR of 1 g/10 min or greater (230° C./2.16 kg); and (B) 5-70 wt % of a block composite nucleator comprising: (1) a first polymer that includes polypropylene; (2) a second polymer that includes an alpha-olefin based polymer, the alpha-olefin being selected from at least one of a C.sub.2 and C.sub.4-10 α-olefins, and (3) a block copolymer having a first segment and a second segment, the first segment of the block copolymer having the same composition as the first polymer in the block composite nucleator and the second segment of the block copolymer having the same composition as the second polymer of the block composite nucleator.

Heterophasic polypropylene composition with improved impact strength/stiffness balance and with high flowability, reduced emissions and low shrinkage, and its use.

A heterophasic polypropylene composition comprises a matrix based on a propylene-random copolymer and a linear low density polyethylene dispersed in the matrix. The heterophasic polypropylene composition has both improved impact strength and reduced amount of fraction soluble in cold xylene (XCS), while maintaining optical properties. Further, the heterophasic polypropylene composition has an optimised ratio of impact strength to the amount of fraction soluble in cold xylene (XCS).p.

The invention relates to a heterophasic propylene copolymer composition comprising a heterophasic propylene copolymer (A), optionally an ethylene-unit containing polymer (B) and an inorganic filler (C), wherein the heterophasic propylene copolymer (A) consists of a) a propylene-based matrix wherein the propylene-based matrix consists of a propylene homopolymer and/or a propylene copolymer consisting of at least 90 wt % of propylene units and at most 10 wt % of comonomer units selected from ethylene monomer units and α-olefin monomer units having 4 to 10 carbon atoms wherein the propylene-based matrix is present in an amount from 87.0 to 92.0 wt % based on the heterophasic propylene copolymer and b) a dispersed ethylene α-olefin copolymer, wherein the dispersed α-olefin copolymer is present in an amount from 8.0 to 13.0 wt % based on the heterophasic propylene copolymer and wherein the sum of the weight of the propylene-based matrix and the weight of the dispersed ethylene-α-olefin copolymer is 100 wt % based on the heterophasic propylene copolymer, wherein C) the inorganic filler is present in an amount of 0.10 to 4.9 wt % based on the composition wherein the melt flow index of the composition is in the range from 5.0 to 9.0 dg/min as determined according to ISO 1133:2011 at 230° C. and 2.16 kg and wherein the total amount of ethylene units in the composition are in the range from 5.7 to 10.0 wt % based on the composition.