ASM 4-Ethenylphenol acetate 2628-16-2 ChemFirst Polymer intermediates ADHESIVE p-Acetoxystyrene Monomer Aromatic ester CFEM’s ASM is a high purity reactive monomer which readily undergoes free radical polymerization to give poly(p-acetoxystyrene) (PAS) polymers in a wide range of molecular weights. ASM behaves much like styrene in free radical polymerizations and can be used as a direct replacement for styrene in most formulations. PAS is easily hydrolyzed to give the corresponding poly(p-hydroxystyrene) (PHS) homopolymer. Once formed, PHS is readily derivatized through standard phenol and ring substitution reactions. ASM monomer can replace some or all of the styrene monomer in homopolymers, impact resistant polymers, acrylonitrile-butadiene terpolymers, specialty copolymers, elastomers and thermosetting polyesters. The use of ASM as a co-monomer directly incorporates chemical functionality into the polymer backbone. Relative reactivities are provided in Table I. ASM / PAS homopolymers and copolymers are effective film forming resins with excellent adhesive and thermal properties. PAS can be selectively hydrolyzed in copolymers with aliphatic esters such as acrylates and methacrylates without hydrolysis of the acrylate moiety. ASM’s reactivity similarity to other unsaturated monomers allows creation of polymeric co/ter polymers with high monomer yield efficiencies. Many of the resulting resins find wide use in 248 nm Deep Ultraviolet (DUV) photolithography for semiconductor chip manufacturing. High purity reactive p-acetoxystyrene monomer. Undergoes free radical polymerization to give poly(p-acetoxystyrene) (PAS) polymers in a wide range of molecular weights. Can replace some or all of the styrene monomer in homopolymers, impact resistant polymers, acrylonitrile-butadiene terpolymers, specialty copolymers, elastomers and thermosetting polyesters. Provides homopolymers and copolymers with excellent adhesive and thermal properties.