General Electric Company

Sabic Innovative Plastics IP B.v.

A S Radhakrishna

Gary Charles Davis

Jan Henk Kamps

Ramesh Krishnamurti

Jan-Pleun Lens

Veeraraghavan Srinivasan

Ravindra Vikram Singh

Ashok Shyadligeri

T Tilak Raj

Debjani Kapila

Ashok A2 Swastik Sapphire Shyadligeri

Debjani Flat No 309 Millenium Habitat Kapila

A dihydroxy aromatic compound having a Formula (I) wherein Ris selected from the group consisting of a cyano functionality, a nitro functionality, an aliphatic functionality having 1 to 10 carbons, an aliphatic ester functionality having 2 to 10 carbons, a cycloaliphatic ester functionality having 4 to 10 carbons and an aromatic ester functionality having 4 to 10 carbons; Ris selected from the group consisting of a cyano functionality, a nitro functionality, an aliphatic ester functionality having 2 to 10 carbons, a cycloaliphatic ester functionality having 4 to 10 carbons and an aromatic ester functionality having 4 to 10 carbons; and each Rand R, at each occurrence, can be the same or different and are independently at each occurrence an aliphatic functionality having 1 to 10 carbons or a cycloaliphatic functionality having 3 to 10 carbons, 'n' is an integer having a value 0 to 4 and 'm' is an integer having a value 0 to 4.

Polycyclic dihydroxy compounds and methods for preparation

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

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Bengaluru, India

A S Radhakrishna