摘要:
Disclosed are rheology modifiers comprising compositionally disperse polymeric compositions and/or crystallinity disperse polymeric compositions that may be useful in modifying the rheological properties of lubrication fluids, and methods for making such compositions. The compositionally disperse polymeric composition are formed from at least two discrete compositions of ethylene copolymers. The crystallinity disperse polymeric composition are formed from ethylene copolymers having at least two discrete values of residual crystallinity.
摘要:
Extruded, copolymer pellet compositions and methods for making the same. A copolymer pellet composition can have an ethylene content of about 40 wt % to about 50 wt % and a propylene content of about 50 wt % to about 60 wt %, based on total weight of the copolymer, wherein the copolymer has a MFR (230° C./2.16 kg) of from about 3.0 g/10 min and about 25 g/10 min; a MWD (Mw/Mn) of about 2.3 or less; and no measurable melting peak, as measured by DSC.
摘要:
Propylene-based polymer compositions are provided comprising propylene and from about 5 wt % to about 20 wt % of one or more C2 and/or C4-C12 α-olefins. The polymer compositions have a triad tacticity greater than about 90%, a heat of fusion less than about 75 J/g, and a melt flow rate (MFR) greater than or equal to about 25 g/10 min (230° C., 2.16 kg). Further, the polymer compositions are reactor grade compositions comprising a reactor blend of a first polymer and a second polymer, preferably where both of the first and second polymers are prepared using the same catalyst system. Meltspun nonwoven fabrics, such as meltblown or spunbond fabrics, comprising such polymer compositions are also provided, as well as processes for forming the nonwoven fabrics.