Patent ID: 8920931

Claim:
A phosphosiloxane resin comprising a plurality of covalently bonded structural units, each covalently bonded structural unit being selected from the group consisting of: a phosphosiloxane unit having formula (I) and an organosiloxane unit having formula (II) R 2 m (OR 3 ) n SiO (4-m-n)/2 (II), where R 1 and each R 2 are independently selected from the group consisting of hydrogen, C 1 to C 10 hydrocarbyl, and C 1 to C 10 hydrocarbylene; each R 3 is independently selected from the group consisting of hydrogen and C 1 to C 10 hydrocarbyl; p is 0 or 1; q=1−p; m is 0, 1, 2, 3, or 4; n is 0, 1, or 2; and m+n is 0, 1, 2, 3, or 4, such that at least 0.001 mol. % of the covalently bonded monomer units are phosphosiloxane units; in each phosphosiloxane unit having q=1, at least one group R 1 or R 2 is C 1 to C 10 hydrocarbylene; m has an average value of from 0.0001 to 3.95 over all of the organosiloxane units present in the phosphosiloxane resin; m+n has an average value of from 0.0001 to 3.95 over all of the organosiloxane units present in the phosphosiloxane resin; and at least one group R 2 is C 1 to C 10 hydrocarbylene.