Polycarbonates and poly iminocarbonates

Several other structurally similar polymers have been prepared from biphenols with less toxicity than bisphenol A. For example, derivatives of the amino acid tyrosine have been used to produce poly(iminocarbonates) that have good mechanical properties, such as poly(desaminotyrosyltyrosine hexyl ester imi-nocarbonate) [29]  

A similar approach can also be used to produce a polycarbonate from derivatives of the dipeptide of tyrosine [30]  

When disks produced from the hexyl esters of the polymers indicated in Equations A.2-15 and A.2-16 were implanted subcutaneously in rats, mild tissue responses were observed, comparable to the response produced by implantation of pLA or polyethylene disks [31]. These materials are being evaluated for orthopedic applications [32]. 

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