Electrodeposition resistance

Manufacture of Printed Wiring Boards. Printed wiring boards, or printed circuit boards, are usually thin flat panels than contain one or multiple layers of thin copper patterns that interconnect the various electronic components (e.g. integrated circuit chips, connectors, resistors) that are attached to the boards. These panels are present in almost every consumer electronic product and automobile sold today. The various photopolymer products used to manufacture the printed wiring boards include film resists, electroless plating resists (23), liquid resists, electrodeposited resists (24), solder masks (25), laser exposed photoresists (26), flexible photoimageable permanent coatings (27) and polyimide interlayer insulator films (28). Another new use of photopolymer chemistry is the selective formation of conductive patterns in polymers (29). 

Hydrophobic solvents (or plasticizers) are often added to electrodepositable resists to lower the Tg of the polymer, enabling electrodeposition to take place at low temperatures and allowing easier control of the film thickness. The coated resist can also flow better (coalesce) during baking, when a plasticizer is present, to give a more compact, defect-free surface. 

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