| 摘要 |
The invention comprises (i) linear polycarbonates containing recurring units of Formula (A) <FORM:0931189/IV(a)/1> wherein R is 1- or 2-naphthyl optionally substituted in the remaining 2- or 1-position with Cl or F and (ii) linear polycarbonate block copolymers consisting of blocks of recurring units of Formula (B) <FORM:0931189/IV(a)/2> and blocks of recurring units of Formula (A). Polycarbonate (i) are prepared from the corresponding bisphenol (see Group IV(b)) and phosgene. Block copolymers (ii) are made by forming separately linear polymers containing respectively units (A) and (B) and then copolymerizing. Example 1 describes the preparation of type (i) polymer, in which R is 2-naphthyl, in presence of NaOH and n-Bu3N. Example 2 describes the preparation of type (ii) block copolymer, the separate polymers being prepared from the respective bisphenols (R is 2-naphthyl), phosgene and NaOH and then being combined in presence of n-Bu3N. The polymers may be made into film or shaped articles.ALSO:The invention comprises bisphenols of formula <FORM:0931189/IV(a)/1> wherein R is 1- or 2-naphthyl-optionally substituted in the remaining 2- or 1-position with Cl or F, and a method of making them by condensing a naphthaldehyde with phenol in the presence of HCl and a catalyst. The preparation of bis(4-hydroxyphenyl)-2-naphthyl methane from 2-naphthaldehyde and phenol in presence of HCl and mercaptopropionic acid is exemplified.
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