Coatings

An electronic or electrical device or component thereof comprising a protective cross-linked polymeric coating on a surface of an electronic or electrical device or component thereof;

• wherein the protective cross-linked polymeric coating is obtained by exposing the electronic or electrical device or component thereof to a plasma comprising a monomer compound and a crosslinking reagent for a period of time sufficient to allow formation of the protective cross-linked polymeric coating on a surface thereof;
• wherein during the period of time, the plasma cycles between an upper limit state and a lower limit state;
• wherein the upper limit state emits a predetermined amount of plasma and the lower limit state emits a relatively lower amount of plasma as compared to the upper limit state;
• wherein the monomer compound has the following formula:
• where n is from 2 to 10;
• wherein the crosslinking reagent has a boiling point of less than 500° C. at standard pressure and has the following structure:
• where Y1, Y2, Y3, Y4, Y5, and Y6 are each independently selected from hydrogen, optionally substituted cyclic, branched or straight chain C1-C6 alkyl or aryl, and L has the following formula:
• where each Y9 is independently selected from, a bond, —O—, —O—C(O)—, —C(O)—O—, —Y11—O—C(O)—, —C(O)—O—Y11—, —OY11—, and —Y11O—, where Y11 is an optionally substituted cyclic, branched, or straight chain C1-C8 alkylene, and
• Y10 is selected from optionally substituted cyclic, branched or straight chain C1-C8 alkylene;
• wherein the monomer and the crosslinker have different formulas;
• wherein the crosslinker is present in an amount of at least 40 (v/v) % and less than 80 (v/v) % based on a total amount of monomer and crosslinker in the coating;
• wherein the coating has a thickness between 1 and 10,000 nm,
• wherein the coating provides electrical resistance between the electronic or electrical device and a water-based liquid,
• wherein the coating allows an electrical connection to be made in a local area between the electronic or electrical device and an electrical connector without requiring removal of the coating,
• wherein the coating is substantially pin-hole free, defined by a surface ratio of ΔZ/d<0.15, where AZ is an average height variation of the coating in nm and dis the thickness in nm.