Resorcinol polyester monomer

The need for moldable grades of polyester prompted a major research effort in the area of copolymers (the chemistry of the materials described here was developed by Dr. Steve Gottis). To retain the excellent thermal resistance of the p-oxybenzoyl homopolymer (continuous use ten era-ture of 550-600°F, short exposure temperatures of 750-800°F), only completely aromatic systems were investigated. Para- -hydroxybenzoic acid was formulated with several co-monomers. These included the meta and para diaclds (isophthalic and terephthalic acid), and various dlhydroxy aromatic compounds, such as hydroqulnone and resorcinol. 

The relatively low contribution of adverse reactions compared to the main one led to regular structure of final polyester. The totally aromatic polyesters of following chemieal constitution were studied in Ref. [132] pol5mier TT-40 consisting of three monomers (terephthaloyl-bis( -oxybenzoie) acid, terephthalic acid, phenylhydroquinone and resorcinol) entering to the polymieric chain in quantities 2 3 5. Terephthalic acid was replaced with monomer containing phenylene cycle in meta-place in polymer OTP-80. ... 

The second category of well known polyarylates contained polymers of a much softer, amorphous nature. These polymers form clear, glassy solids from Isotropic melts the polyesters tend to have high levels of relatively asymmetric monomers such as resorcinol or bIsphenol-A, The glassy polyarylates have, not surprisingly, unexceptional physical properties. 

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