Sovrez 66 p-alkyl-phenol formaldehyde resol Sovereign Chemical Aminoplaste / Phenoplaste (UF, MUF) >> Alkyl phenolic resin Aminoplaste / Phenoplaste (UF, MUF) >> Phenol Formaldehyde Modified butyl-based resin for high heat resistance applications Modified butyl-based phenolic resin for high heat resistance applications.