| http://www.w3.org/ns/prov#value | - Thereby, a phosphate group having an ethylenically unsaturated bond is coupled to the phenol-formaldehyde resin as shown in formula (IV), wherein, R1 and R2 have the meaning described above; R3 is C2-6 straight-chain or branched alkylene and optionally substituted with heteroatoms or aryl groups; Y is a functional group having an ethylenically unsaturated bond; and x is 0 or 1.
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