Imperial Chemical Industries Limited

Timothy Douglas Andrews

Stuart C Rennison

John A Pope

Glyn D Short

Jan Willem Van Ingen

Pooei John A

Modifying the surface of a diazotype material by incorporating an acrylic or methacrylic polymer into the diazotype sensitizing coating composition or coating the assembly with it so as to roughen the surface of the material thereby enabling nitrogen, which is liberated when the material is exposed to light, to escape from between the master and the diazotype material to prevent nitrogen accumulating between the two and hence avoiding slippage of one relative to the other.

Diazotype materials

Modifying the surface of a diazotype material by incorporating hydroxyalkyl cellulose ether into the diazotype sensitizing coating composition or coating the assembly with it so as to roughen the surface of the material thereby enabling nitrogen, which is liberated when the material is exposed to light, to escape from between the master and the diazotype material to prevent nitrogen accumulating between the two and hence avoiding slippage of one relative to the other.

Diazotype materials with hydroxypropyl cellulose ether as anti-slip

Metal is deposited on a substrate containing neutral radicals, radical cations or neutral molecules (the latter being derived from a dication normally stable in aqueous media), by contacting the substrate with an electroless plating solution, optionally after sensitization with a salt of a platinum group metal silver or gold. The use of the process for data recording, particularly for the production of magnetic information carriers e.g. tapes or discs, metallizing plastic foam and for producing printed circuits is described.

Metal deposition process

In an image recording process, a radiation sensitive film comprising a photo-reducible compound is exposed to radiation and subsequently is contacted with a fixing agent capable of being reduced by the reduction product of the photo-reducible compound, with the production of an insoluble coloured material.

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Runcorn, United Kingdom

Timothy Douglas Andrews