Composition for preparing a release coating, release coating composition, and related methods

A base composition for forming a release coating composition, said base composition comprising:

• (A) a silicate resin that is a liquid at 25° C. in the absence of any solvent, the (A) silicate resin including an average of at least one silicon-bonded ethylenically unsaturated group per molecule;
• and
• (B) an organopolysiloxane including an average of at least two silicon-bonded ethylenically unsaturated groups per molecule;
• wherein the (A) silicate resin is miscible with the (B) organopolysiloxane in the absence of any solvent;
• wherein the (A) silicate resin has the average formula
• where subscript a is from 0.15 to 0.40;
• subscript b is from 0.10 to 0.40;
• and subscript c is from 0.35 to 0.60;
• and
• wherein:
• [W] is [R3SiO1/2], where each R is an independently selected hydrocarbyl group;
• [X] is [R2SiO1/2(OZ)]b, [R2SiO2/2]b″, where each R is independently selected and as defined above;
• 0≤b′≤b;
• 0≤b″≤b;
• with the proviso that b′+b″=b;
• and each Z is independently H, an alkyl group, or a cation;
• and
• [Y] is [Si(OZ)c′O4-c′)/2], where each Z is independently selected and as defined above, and subscript c′ is an integer from 0 to 3 and is independently selected in each siloxy unit indicated by subscript c in the (A) silicate resin;
• with the proviso that at least one of R is an ethylenically unsaturated group;
• wherein the silicate resin (A) has a mole percent of SiOZ moieties of from 12 to 80 percent based on the total number of moles of Si in each molecule, wherein Z is independently selected from H, an alkyl group, or a cation.