The Dow Chemical Company

Dow Global Technolgoies LLC

Ying-Hung So

Philip E Garrou

Kaoru Ohba

Hideki Akimoto

Britton Lee Kaliszewski

Brian B Martin

Albert Charles Marie Achen

The invention is a process for building-up printed wiring boards using metal foil coated with toughened benzocyclobutene-based dielectric polymers. The invention is also a toughened dielectric polymer comprising benzocyclobutene-based monomers or oligomers, ethylenically unsaturated polymer additive, and, optionally, a photoactive compound.

Toughened benzocyclobutene based polymers and their use in building-up printed wiring boards

The invention is a process for the preparation of an aromatic hydrocarbon with a cyclobutene ring fused to the aromatic hydrocarbon which comprises, dissolving an ortho alkyl halomethyl aromatic hydrocarbon in an inert solvent and pyrolyzing the solution of ortho alkyl halomethyl aromatic hydrocarbon in the inert solvent under conditions such that the ortho alkyl and halomethyl substituents form a cyclobutene ring thereby forming an aromatic hydrocarbon having a fused cyclobutene ring.

Preparation of cyclobutene substituted aromatic hydrocarbons

Electrolytically prepare para-chloroalkyl aromatic compounds, such as para-chlorotoluene, using a potential of less than 1.5 volts, as measured against a Ag/Ag.sup.+ reference electrode, and an anode which is free of cyclodextrin.

Electrochemical chlorination process

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Midland, MI, United States of America

Ying-Hung So