PHS B Branched poly(p-hydroxystyrene) 166164-76-7 ChemFirst Polymer intermediates ADHESIVE Derived from CFEM’s unique chemistry, branched poly(p-hydroxystyrene) (PHS-B) is an almost fully branched product with little styrenic backbone character in the polymer. Its structure suggests potential end use in branched polyphenolic polymers where high purity, consistent batch-to-batch reproducibility, tighter polydispersity, good film transparency, and a departure from formaldehyde based resins is desirable. The chemistry used to prepare PHS-B produces the “Novolac type” structure shown above. The resulting polymer is of low linearity with repeating branched units positioned ortho to the -OH functionality. Such materials find use in adhesives, i-Line photoresist formulations, and applications where a high degree of crosslinking and surface adhesion are required. PHS-B is available as a neat, off white to orange dry powder, or can be supplied in a variety of solvents. Branched poly(p-hydroxystyrene) with little styrenic backbone character in the polymer. Used in branched polyphenolic polymers where high purity, consistent batch-to-batch reproducibility, tighter polydispersity, good film transparency, and a departure from formaldehyde based resins is desirable.