Occidental Chemical Corporation

Equistar Chemicals, LP

General Electric Company

Lyondell Petrochemical Company

Sabic Innovative Plastics IP B.v.

Ramesh Krishnamurti

Sandor M Nagy

Bradley P Etherton

John A Tyrell

Thomas F Smolka

Habib Hichri

Mary K Cocoman

Gurram Kishan

Leonard V Cribbs

Qi Wang

Jan-Pleun Lens

Henry C Lin

John Tyrell

Ashok Shyadligeri

Mahendra K Dosi

Debjani Kapila

Gary Charles Davis

Katherine Campbell Glasgow

Edward Joseph Nesakumar

Veeraraghavan Srinivasan

Lawrence B Fertel

Pramod Shankar Kumbhar

Robert A Buchanan

Umesh Krishna Hasyagar

Vinod Kumar Rai

David C Johnson

Brian Thomas Carvill

Jegadeesh Thampi

James G Colson

Nileshkumar Prakash Kukalyekar

Walter M Opalinski

Vladimir Dragan

G V Ramanarayanan

A S Radhakrishna

Kapila Debjani

Arakali Radhakrishna Srinivasarao

Rose Adinolfe

Nilesh Kumar Parkash Kukalyekar

Radhakrishna Sreenivasarao Arakali

Bib Hichri

Ashok A2 Swastik Sapphire Shyadligeri

Debjani Flat No 309 Millenium Habitat Kapila

A process for preparing aromatic bisphenols, wherein the method comprises reacting an aromatic hydroxy compound with an alkylating agent having a functionality of two in the presence of a catalyst system. The catalyst system used for the process is selected from the group consisting of a heteropolyacid compound, a clay, a functionalized metal oxide catalyst and combinations of the foregoing.

Process for preparing bisphenols

A commercial scale continuous process for the production of a bisphenol comprising reacting a phenol and a ketone in the presence of a modified ion exchange resin catalyst, wherein said modified ion exchange resin comprises a crosslinked gellular acid functionalized polystyrene resin modified by neutralization of with a mercapto promoter.

Process for the synthesis of bisphenol

A process for forming a cycloalkylidene bisphenol comprises: reacting a cycloalkanone compound of formula:where [A] is a substituted or an unsubstituted aromatic group, R&#x2013;Rindependently represent a hydrogen or a C&#x2013;Chydrocarbyl group; and 'a' and 'b' are integers independently having values from 0&#x2013;3; with an aromatic hydroxy compound of formula [A]-OH, where [A] is as previously described; at a mole ratio of greater than or equal to about 20, in the presence of a sulfonic acid type ion exchange resin catalyst crosslinked with greater than or equal to about 8 weight percent of divinylbenzene, and a promoter selected from the group consisting of a mercaptan compound and a resorcinol compound; to form a cycloalkylidene bisphenol of formula:where [A], R&#x2013;R, &#x201c;a&#x201d; and &#x201c;b&#x201d; are as previously described. Moreover, any acid catalyst can be used with a resorcinol promoter.

Methods for preparing cycloalkylidene bisphenols

Transition metal catalysts containing bidentate ligands and method of using and preparing same

A method for purifying 1,1-bis(4&prime;-hydroxy-3&prime;-methylphenyl)cyclohexane comprises dissolving said 1,1-bis(4&prime;-hydroxy-3&prime;-methylphenyl)cyclohexane in a first solvent consisting essentially of an alcohol to form a first solution; filtering said first solution; adding a second solvent consisting essentially of water to the filtered first solution to form a second solution, wherein said second solution comprises about 40 parts to about 95 parts of the first solvent per 100 parts of the combined weight of the first and second solvents; crystallizing said 1,1-bis(4&prime;-hydroxy-3&prime;-methylphenyl) cyclohexane from said second solution to form a first crystalline product; dissolving said first crystalline product in a third solvent to form a third solution, wherein the third solvent comprises an aromatic compound; and crystallizing said 1,1-bis(4&prime;-hydroxy-3&prime;-methylphenyl)cyclohexane from said third solution to produce a second crystalline product.

Method for purifying 1,1-bis(4&prime;-hydroxy-3&prime;-methylphenyl)cyclohexane and methods of producing polycarbonates therefrom

The present invention provided an improved method for preparing a boratabenzene derivative. The invention includes an improved preparation of 1,4-pentadiyne, 1-haloboracyclohexa-2,5-diene, and 1-methylboracyclohexa-2,5-diene intermediates. These compounds are chemically labile and are not directly isolated from solution. Furthermore, the invention discloses an improved preparation of 1,1-dialkylstannacyclohexa-2,5-diene, another intermediate useful for preparing boratabenzene derivatives.

Method for preparation of boratabenzene derivatives

Inhibiting scale in vinyl monomer polymerization

A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is &pgr;-bonded to M. The key ligand is made in two steps from readily available indanones and aryl hydrazines. Reaction of its anion with a source of the metal completes a remarkably simple synthetic route to a new family of single-site olefin polymerization catalysts.

Single-site catalysts for olefin polymerization

Olefin polymerization is performed in the presence of a catalyst comprising a compound of the formula

Olefin polymerization catalysts containing amine derivatives

Polymerizing vinyl chloride in carbon dioxide

Disclosed is a catalyst having the general formula

Azaborolinyl metal complexes as olefin polymerization catalysts

A single-site olefin polymerization catalyst is described. The catalyst comprises an activator and an organometallic compound that includes an amine derivative ligand. The catalyst is highly productive, incorporates comonomers well, and gives polymers with narrow molecular weight distributions. The compound is of the formula

Growing community of inventors

Bengaluru, India

Ramesh Krishnamurti