Exxon Research and Engineering Company

Exxonmobil Chemical Patents Inc.

Joseph C Floyd

Donna Jean Crowther

Moses Olukayode Jejelowo

George Alan Vaughan

Don A Plank

Ching Tai Lue

Robert A Van Brederode

Don Allen Plank

Henry G Schutze

Frank J Lundy, Jr

The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound comprising one &#x3c0;-bonded ring having a Cor greater hydrocarbyl, hydrocarbylsilyl or hydrocarbylgermyl substituent said substituent bonded to the ring through a primary carbon atom; and, where the compound contains two &#x3c0;-bonded rings, the total number of substituents on the rings is equal to a number from 3 to 10, said rings being asymmetrically substituted where the number of substituents is 3 or 4. The invention process is particularly suitable for preparing ethylene copolymers having an MIR less than about 35, while retaining narrow CD even at high comonomer incorporation rates, and with certain embodiments providing ethylene copolymers having improved melt strength with the low MIR.

Olefin polymerization process with alkyl-substituted metallocenes

The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound comprising one &pgr;-bonded ring having a C or greater hydrocarbyl, hydrocarbylsilyl or hydrocarbylgermyl substituent said substituent bonded to the ring through a primary carbon atom; and, where the compound contains two &pgr;-bonded rings, the total number of substituents on the rings is equal to a number from 3 to 10, said rings being asymmetrically substituted where the number of substituents is 3 or 4. The invention process is particularly suitable for preparing ethylene copolymers having an MIR less than about 35, while retaining narrow CD even at high comonomer incorporation rates, and with certain embodiments providing ethylene copolymers having improved melt strength with the low MIR.

Polypropylene is neutralized and deashed by contacting a slurry of the particulate polymer with an alcohol solution of from 1 to 5 milliequivalents of an alkali base, preferably Na or K, excess beyond that needed to neutralize said polymer.

Process for neutralizing and deashing polypropylene

Novel bisphenol condensation derivatives including polyphosphorous, polyborate, polycarbonate and polysilicate products which are capped with various capping agents such as phenoxy or alkoxy compounds are effective stabilizers for a wide spectrum of hydrocarbon polymeric materials against their thermal oxidative and photochemical degradations.

Novel bisphenol derivatives and uses thereof

Novel bisphenol condensation derivatives including polyphosphorous, polyborate, polycarbonate and polysilicate products which are capped with various capping agents such as phenoxy or alkoxy compounds are efffective stabilizers for a wide spectrum of hydrocarbon polymeric materials against their thermal oxidative and photochemical degradations.

Plastic compositions containing polyolefins and substituted nitrogen heterocyclic compounds having the formula: ##STR1## wherein X is nitrogen or CH, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are from the group hydrogen; a straight or branched chain alkyl group having from 1 to 6 carbon atoms; cyano; nitro; lower alkoxy; fluorine, dialkylamino, phenyl, halo-phenyl, benzyl and halo-benzyl, have been found to be photodegradable plastic materials for use, for example, as wrapping films and agricultural mulching films.

Photodegradable plastic compositions containing nitrogen heterocyclic

Novel polycarbon stabilizers

Derivatives of grafted polymers are prepared in solvent phase. The resulting products, which can be tailor-made in terms of certain properties impart, when used in relatively small quantities, certain additive functions to the properties of other polymers or the modified products of the invention can be used by themselves per se for conventional plastic uses.

Polymers containing non-extractable/non-volatile additives and processes

Finely powdered high density polymer may be obtained by spraying a solution of a critical maximum amount of a polymer, such as 3 weight % polypropylene in heptane, into a drying atmosphere in which said solvent has a vapor pressure of 50 to 400 mm of Hg.

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Baytown, TX, United States of America

Joseph C Floyd