Rexene Corporation

Rexene Products Company

El Paso Products Company

Huntsman Polymers Corporation

George C Allen

Michael P Hughes

Andres Sustic

Brian J Pellon

Lixin Sun

Roger Merrill

Kasinath Nayak

Methods of producing polyolefin polymers by polymerizing an .alpha.-olefin in the presence of a catalyst including a pro-catalyst having a magnesium halide, an aluminum halide, a tetravalent titanium halide, an electron donor, and a silane having the formula R.sub.1 R.sub.2 Si(OR.sub.3) (OR.sub.4), wherein R.sub.1 and R.sub.2 are each an H, C.sub.1-6 alkyl, aryl, C.sub.5-12 cycloalkyl, each of which may be unsubstituted, mono- or di-substituted, and R.sub.3 and R.sub.4 are H, C.sub.1-6 alkyl, or a mono- or di-substituted C.sub.1-6 alkyl, and a co-catalyst comprising an organometallic compound, or reaction products of the pro-catalyst and the co-catalyst, wherein the electron donor is present in an amount sufficient to reduce the stickiness of the resultant polyolefin polymers. Moreover, the polymers produced thereby, and methods of preparing resultant products from the polymers are part of the present invention.

Olefin polymerization process and products thereof

A catalyst for use in the production of flexible polyolefins using a pro-catalyst of (a) a magnesium halide, (b) an aluminum halide, (c) a tetravalent titanium halide, (d) an electron donor comprising at least one of 2,6-lutidine, 6-chloro-2-picoline, or 2,6-dichloropyridine; and (e) a silane having the formula R.sub.1 R.sub.2 Si(OR.sub.3)(OR.sub.4), wherein R.sub.1 and R.sub.2 are each an H, C.sub.1-6 alkyl, C.sub.1-6 aryl, C.sub.5-12 cycloalkane, each of which may be unsubstituted, mono- or di-substituted, and R.sub.3 and R.sub.4 are H, C.sub.1-6 alkane, or a mono- or di-substituted C.sub.1-6 alkane, and a co-catalyst of an organometallic compound, as well as an optional external modifier that may be combined to form a catalyst. Methods for preparing the catalyst, for using the same to produce flexible polyolefin compositions having reduced stickiness and tacticity, and the flexible polyolefin compositions produced thereby are also part of the invention. The flexible polyolefin compositions are high-molecular weight average, predominantly atactic flexible polyolefin polymers having a heat of fusion of about 15 J/g to 60 J/g, a polydispersity of less than about 10, a melt flow rate of between about 0.3 g/10 min. to 15 g/10 min., and a reduced stickiness.

Catalyst for the production of flexible polyolefin compositions, methods

Amorphous propylene/1-butene and ethylene/propylene copolymers having increased tensile properties produced by the process comprising: reacting propylene and 1-butene monomers or ethylene and propylene monomers in the presence of a catalyst system comprising: (a) a solid supported catalyst component is prepared by the method comprising: (i) co-comminuting magnesium halide support base and aluminum trihalide in a molar ratio from about 8:0.5 to about 8:3 in the absence of added electron donor; and (ii) then co-comminuting the product of step (i) in the absence of added electron donor with sufficient titanium tetrahalide to provide a molar ratio of magnesium halide to titanium tetrahalide from about 8:0.1 to about 8:1.0; (b) a trialkylaluminum co-catalyst, having from 1 to 9 carbon atoms in each alkyl group in an amount such that the Al/Ti ratio is between about 50:1 and about 500:1; and (c) an alkoxy silane component of the formula R.sub.n Si(OR').sub.4-n where n=1-3, R=aryl or alkyl and R'=C.sub.1-3 alkyl.

High tensile strength amorphous 1-butene/propylene and

Amorphous propylene/1-butene and ethylene/propylene copolymers having increased tensile properties produced by the process comprising:

High tensile strength amorphous 1-butene/propylene and ethlene/propylene

A radiation resistant resin suitable for the manufacture of, for example, disposable medical supplies comprises a semicrystalline polypropylene or propylene-ethylene and from 1500 to 5000 ppm triallyl trimellitate. The resin exhibits substantially no increase in melt flow rate after irradiation to a dosage of up to 5 Mrads, and may contain up to about 5% by weight of a polybutylene and/or up to about 3000 ppm of a sorbital based clarifying agent.

Radiation resistant polypropylene resins

A process for the production of propylene/1-butene copolymers comprising:

High tensile strength amorphous 1-butene/propylene copolymers

Novel, substantially amorphous copolymers of propylene and ethylene are disclosed. The polymers have properties which make them applicable for use, e.g., as hot melt adhesives and as blending components in roofing materials.

Novel propylene polymers

A novel highly efficient process is disclosed for the production of substantially amorphous ethylene-propylene copolymers. The polymers have properties which make them applicable for use, e.g., as hot melt adhesives, as blending components in roofing materials, and as cable and wire flooding agents.

Novel propylene polymerization process

A novel process for the production of substantially amorphous interpolymers of propylene, ethylene and optionally a third alpha-olefin comonomer having between 4 and 8 carbon atoms per molecule is disclosed. The polymers have properties which make them applicable for use, e.g., as hot melt adhesives and as blending components in roofing materials.

Pentane derived from fractionation of sulfur-containing natural gasoline is desulfurized to low levels of sulfur, e.g., 1 ppm or below, in a process comprised of contacting the pentane in a first zone with molecular sieve adsorbent to remove dimethylsulfide and then in a second zone with activated carbon to remove carbon disulfide.

Growing community of inventors

Odessa, TX, United States of America

George C Allen