Alkoxy-functional silsesquioxane resin and processes for the preparation and use thereof

An alkoxy-functional silsesquioxane resin comprising unit formula:

• (R23SiO1/2)c(R22SiO2/2)d(R2SiO3/2)e(ZO1/2)f(HO1/2)g;
• where
• each R2 is independently selected from the group consisting of an alkyl group and a group of formula (I)
• where in formula (I),
• each R1 is an independently selected alkyl group,
• each D1 is an independently selected alkylene group,
• subscripts a, b, and x are integers with values such that
• subscript a is 1 or 2,
• subscript b is 1, and
• subscript x is 0 or 1;
• with the proviso that an average of 5 mol % to 25 mol % of R2, per molecule, have formula (I);
• subscripts c, d, and e represent mole fractions of each unit in the alkoxy-functional silsesquioxane resin and subscripts c, d, and e have values such that
• 0
• ≤
• c
• ≤
• 0
• .
• 2
• ⁢
• 5
• ,
• 0
• ≤
• d
• ≤
• 0
• .
• 2
• ⁢
• 0
• ,
• 0.55
• <
• e
• ≤
• 1
• ,
• and
• a
• ⁢
• quantity
• ⁢
• (
• c
• +
• d
• +
• e
• )
• =
• 1
• ;
• each Z is an independently selected alkyl group;
• and
• subscript f represents a molar amount of alkoxy groups in the resin, and subscript g represents a molar amount of hydroxyl groups in the resin, and subscripts f and g have values such that
• 0.01
• ≤
• f
• ≤
• 0.7
• ;
• 0
• ≤
• g
• ≤
• 0.05
• ;
• and
• 0.02
• ≤
• (
• f
• +
• g
• )
• ≤
• 0.75
• ;
• where the alkoxy-functional silsesquioxane resin is in a liquid state at 23° C.±3° C. and 101.325 kPa.