The Dow Chemical Company

Dupont Dow Elastomers Inc.

Debra J Mangold

Deepak R Parikh

Michael K Laughner

James C Stevens

Thoi H Ho

Peter N Nickias

Jasson T Patton

Daniel D VanderLende

Robert Thomas Johnston

Lawrence T Kale

Patrick J Schouterden

Lambertus P Van Der Heijden

Evelyn J Morrison

Miguel Garcia Marti

Jesus Nieto Palomo

Ethylene-based polymer blends having an MWD of at least about 2 are made in a single reactor using a mixed constrained geometry catalyst (CGC) system. The process comprises the steps of contacting under polymerization conditions and in a single reaction vessel (i) ethylene, (ii) at least one C -C &agr;-olefin, (iii) optionally, at least one polyene, and (iv) a mixed CGC system.

Process for preparing in a single reactor polymer blends having a broad molecular weight distribution

The subject invention is directed to an olefin polymer produced by polymerizing at least one &agr;-olefin in the presence of a Group 4 metal complex comprising an indenyl group substituted in the 2 or 3 position with at least one group selected from hydrocarbyl, perfluoro-substituted hydrocarbyl, silyl, germyl and mixtures thereof, said indenyl group further being covalently bonded to the metal by means of a divalent ligand group, wherein the divalent ligand comprises nitrogen or phosphorus having an aliphatic or alicyclic hydrocarby group covalently bonded thereto via a primary or secondary carbon. Preferred olefin polymers of the invention will be characterized as having a high molecular weight, narrow molecular weight distribution, high vinyl content, and a bimodal DSC melting curve or a deconvoluted ATREF or GPC curve which shows at least two distinct narrow peaks. The olefin polymer will have utility in a variety of applications, including but not limited to films, fibers, foams, molded parts, and as components of formulations such as adhesives, sealants, coatings, caulks, and asphalt.

Olefin polymers prepared with substituted indenyl containing metal complexes

Ethylene-based polymer blends having an MWD of at least about 2 are made in a single reactor using a mixed constrained geometry catalyst (CGC) system. The process comprises the steps of contacting under polymerization conditions and in a single reaction vessel (i) ethylene, (ii) at least one C -C (&agr;-olefin, (iii) optionally, at least one polyene, and (iv) a mixed CGC system.

The subject invention pertains to heteromorphic polymer compositions characterized as comprising: (a) a homogeneous linear or substantially linear ethylene/&agr;-olefin interpolymer backbone; and (b) a branch appending from the backbone, which branch comprises an ethylene homopolymer or ethylene/&agr;-olefin interpolymer having a density which is at least 0.004 g/cm,greater than that of the backbone. At least one of the backbone polymer or the branch polymer may be optionally functionalized to promote adhesion to polar surfaces. The heteromorphic polymer compositions of the invention exhibit enhanced upper service temperature. Also disclosed is a process for preparing the heteromorphic polymer compositions of the invention.

Heteromorphic polymer compositions

Interpolymer of a) a mono-olefin selected from the group consisting of .alpha.-olefins and cyclic olefins, and b) a non-conjugated polyene having at least 7 carbon atoms and having two readily polymerizable double bonds, having an improved melt tension, improved processability, or a combination of both, a process of preparing such interpolymers, composition comprising such interpolymers and one or more further natural or synthetic polymers or one or more additives or adjuvants, as well as articles obtained by subjecting such interpolymers to melt processing conditions.

Mono-olefin/polyene interpolymers, method of preparation, compositions

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Lake Jackson, TX, United States of America

Debra J Mangold