Polymer mixture having aromatic polycarbonate, styrene I containing copolymer and/or graft polymer and a flame-retardant, articles formed therefrom
AssigneeGeneral Electric Company
InventorsJohannes C. Gosens, Charles F. Pratt, Herman B. Savenije, Christianus A. A. Claesen
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Abstract
The invention relates to a polymer mixture which comprises an aromatic polycarbonate, a styrene-containing copolymer and/or a styrene-containing graft polymer and a flame-retardant. It has been found that the use of a certain type of flame-retardants, namely oligomeric phosphates leads to a polymer mixture having improved properties. In particular to a polymer mixture having a good combination of flame retardancy, non-juicing characteristics of the flame retardant, good plastifying effect and good heat resistance.
Claims14
A polymer mixture which comprises an aromatic polycarbonate (A), a styrene-containing copolymer and/or styrene-containing graft copolymer (B) and a phosphate based flame-retardant (C), characterized in that the polymer mixture comprises as flame-retardant an oligomeric phosphate or a blend of oligomeric phosphates with the following formula I:
- ##STR3## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4, each represent an aryl or an alkaryl group chosen independently of each other with the proviso that none of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are xylyl and wherein X is an arylene group, m.sub.1, m.sub.2, m.sub.3, and m.sub.4, each independently of each other are 0 or 1 and wherein n=1,2,3,4 or 5 or wherein, in case of a blend of phosphates, n has an average value of 1 to 5.
Dependencies are inferred from the claim text.