CROSS-LINKED POLYCARBONATE RESIN WITH IMPROVED CHEMICAL AND FLAME RESISTANCE

摘要

Disclosed herein are compositions including a cross-linked polycarbonate. The cross-linked polycarbonate may be derived from a polycarbonate having about 0.5 mol % to about 5 mol % endcap groups derived from a monohydroxybenzophenone. A plaque including the composition can achieve a UL94 5VA rating. Also disclosed herein are articles including the compositions, methods of using the compositions, and processes for preparing the compositions.

主权项

1. A composition comprising:
a cross-linkable polycarbonate resin comprising about 0.5 mole % to about 5.0 mole % endcap groups derived from a monohydroxybenzophenone, wherein the cross-linkable polycarbonate resin is made from an interfacial polymerization process comprising the steps of: (i) forming a mixture comprising bisphenol-A, a monohydroxybenzophenone, and a tertiary amine catalyst in a water-immiscible solvent and water solvent system; (ii) stirring the mixture of (i) while maintaining a pH from about 8 to about 9 by the addition of a basic solution to form a stirred mixture; (iii) charging the stirred mixture of (ii) with phosgene, while simultaneously adding a basic solution to maintain the pH between about 8.5 to about 10 to form a reaction mixture containing the cross-linkable polycarbonate resin; (iv) separating the organic layer from the reaction mixture; (v) washing the organic layer of (iv) with an aqueous acid; (vi) washing the acid-washed organic layer of (v) with deionized water to achieve a neutral pH; and (vii) isolating the cross-linkable polycarbonate resin from the neutral organic layer of (vi);wherein the cross-linkable polycarbonate resin has a weight-average molecular weight of between 17,000 and 35,000 Daltons and has a polydispersity index (PDI) of between 3.0 and 7.3 as measured by GPC using a UV-VIS detector and polycarbonate standards.