Abstract: Described are certain monocyclopentadienyl Group IV B metal compounds, catalyst systems comprising such monocyclopentadienyl metal compounds and an activator, and a process using such catalyst systems for the production of polyolefins, particularly high molecular weight ethylene-.alpha.-olefin copolymers having a high level of .alpha.-olefin incorporation.

Abstract: The invention is a catalyst system including a monocyclopentadienyl titanium compound and an alumoxane component which is highly productive for polymerizing ethylene and .alpha.-olefins to produce a high molecular weight ethylene-.alpha.-olefin copolymer having a high content of .alpha.-olefin.

Abstract: A bitumen composition comprising asphalt and a low molecular weight .alpha.-olefin homopolymer or copolymer. The composition is useful in the preparation of roofing coatings or materials and the cured roofing material will exhibit improved low temperature flexibility when compared to prior art roofing compositions. The composition may also contain other additives including high molecular weight polymers, fillers, fire retardants, anti-oxidants, anti-ozonants, pigments and the like.

Abstract: Disclosed is a method for the production of a gas-pervious composite film comprising the steps of unaxially or biaxially drawing a film composed of a crystalline polyolefin resin, a rubbery polymer, and a filler thereby forming a drawn film, joining said drawn film to a meshed sheet by hot pressing at a temperature exceeding the temperature at which said drawn film begins to undergo thermal shrinkage thereby fastening said drawn film to said meshed sheet and, simultaneously, causing thermal shrinkage of said drawn film and consequently imparting a microporous texture to said film.

Abstract: A nonwoven web is prepared from a polymeric blend comprising at least one elastomer and at least one thermoplastic resin. The nonwoven web comprises fibers produced by melt blowing the polymeric blend. Conventional techniques are used to accomplish the melt blowing but due to high viscosity of certain elastomers it is frequently necessary to degrade the polymer blend prior to melt blowing. The nonwoven web exhibits improved extensibility, texture and hand.

Abstract: An olefin polymerization catalyst comprising the reaction product of a metallocene complex of Group IVB, VB, VIb, and VIII of the Periodic Table and an excess of alumoxane.

Abstract: Extrusion coating with high line speeds of up to 600 mpm may be achieved without sacrificing the adhesion of the coating to the substrate by using an ethylene copolymer with up to 3% by weight copolymer, preferably 0.5 to 2.5% by weight VA, as the coating polymer. The extrusion temperature is in the region of incipient degradation, but maintained below the level which gives undesired degradation leading to odor or discoloration.

Abstract: A process for producing a catalyst component for polymerization of olefins which comprises contacting (a) a metal oxide with (b) an organomagnesium compound represented by the formula RMgR' wherein R denotes a hydrocarbyl group and R' denotes a hydrocarbyl group or a halogen atom, contacting the resulting contacting product with (c) carbon dioxide, and further contacting the resulting contact product with (d) a titanium compound. Optionally, the carbon dioxide contacted contact product can be treated with the halogen-containing compound prior to contact with the titanium compound.

Abstract: A micro-porous membrane of ultra-high-molecular-weight alpha-olefin polymer having a weight-average molecular weight greater than 5.times.10.sup.5, the micro-porous membrane having through holes 0.01 to 1 micrometer in average pore size, with a void ratio from 30 to 90% and being oriented such that the linear draw ratio in one axis is greater than two and the areal draw ratio is greater than ten. The micro-porous membrane is obtained by forming a gel-like object from a solution of an alpha-olefin polymer having a weight-average molecular weight greater than 5.times.10.sup.5, removing at least 10 wt % of the solvent contained in the gel-like object so that the gel-like object contains 10 to 90 wt % of alpa-olefin polymer, orientating the gel-like object at a temperature lower than that which is 10.degree. C. above the melting point of the alpa-olefin polymer, and removing the residual solvent from the orientated product.

Abstract: Adhesion to a low gloss polyolefin surface is improved by forming the polyolefin from linear low density polyethylene (LLDPE) with hexene-1 as the comonomer, particularly LLDPE with a density of less than 0.926 and high pressure low density polyethylene (LDPE density of 0.910-0.925) or a mixture of the high pressure low density polyethylene and up to 30 wt. % of a high density polyethylene (HDPE density 0.948-0.965). Preferably the polyolefin composition will contain 45 to 85 wt. % of the LLDPE and 10 to 60 wt. % of LDPE.