PHS HP-01 Homopolymer of 4-ethenylphenol 24979-70-2 ChemFirst Polyvinyl acetate emulsions & derivatives (PVAc…) ADHESIVE HIGH PURITY Electronic Grade Poly(p-hydroxystyrene) CFEM’s PHS-XE-HP is a low metals, ultra-high purity, 100% linear vinyl homopolymer available in a variety of molecular weights. Produced via the same free radical chemistry from ASM as CFEM’s standard PHS-XE-01, the high purity (HP) material process incorporates in situ fractionation and purification of the resin, yielding a product of higher 248 nm transparency, narrower polydispersity, higher Tg, and near zero impurities content. This electronic grade homopolymer targets use in critical layer resists for 248 nm DUV photolithography used in semiconductor chip manufacturing. The resin offers potential for reduction in defects commonly found in DUV semiconductor manufacturing that may arise from resins used in process photoresists. PHS-XE-HP can be prepared in molecular weights ranging from 2,500 to 50,000 or more. Standard product offerings have molecular weights of 10,000, 15,000, and 20,000 in either dry powder form, or in organic solvents such as PGMEA or Ethyl Lactate at solids levels from 20 to 40 wt%. PHS-XE-HP powder is hygroscopic and, as such, readily absorbs moisture from the air. PHS powder may be dried under vacuum at up to 70 °C. Low metals, ultra-high purity, 100% linear poly(p-hydroxystyrene)available in a variety of molecular weights. Offers potential for reduction in defects.