The Dow Chemical Company

Eric E Bancroft

Zenon Lysenko

Chun S Wang

Abel Mendoza

David B Fritz

Titled materials and their preparation. The materials contain a moiety such as, for example, 4-oxy-3,5-dimethyl-2,6-dibromobenzyl which can impart a high degree of thermal and hydrolytic stability to the materials, for example, epoxy thermosets such as in electronic encapsulations. For example, when used in electronic encapsulation formulations, these materials can provide a substantial increase in electronic device reliability. Their preparation involves an alkylation of an aromatic ring, for example, such as a Friedel-Crafts alkylation with 4-bromomethyl-3,5-dibromo-2,6-dimethylphenol or with 4-hydroxymethyl-3,5-dibromo-2,6-dimethylphenol.

Meta-halo-phenolic alkylation products and epoxy systems

A method for producing dihydroxybenzophenones by the electrocatalytic oxidation of bis(4-hydroxyphenyl) methanes, or the quinone methide intermediate, with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). Spent oxidant, in the form of DDQH.sub.2, may be recycled and electrochemically regenerated to active DDQ oxidant.

Electrocatalytic method for producing dihydroxybenzophenones

A method for producing quinone methides by the electrocatalytic oxidation of bis(4-hydroxyphenyl)methanes using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as the oxidant. Spent oxidant, in the form of DDQH.sub.2, may be recycled and electrochemically regenerated to active DDQ oxidant.

Electrocatalytic method for producing quinone methides

A method for producing quinone methides by the electrolytic oxidation of bis(4-hydroxyphenyl)methanes at a potential of 1.1-1.5 V vs. SCE.

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Midland, MI, United States of America

Eric E Bancroft