Abstract: The invention relates to a polymer mixture which comprises the following constituents: Ai) a graft copolymer built up from a rubber-like graft base consisting substantially of a butadiene rubber, on which one or more vinylaromatic monomeric compounds and one or more unsaturated nitrile monomeric compounds have been grafted or Aii) a mixture of Ai and an aromatic polycarbonate, and B) a copolyether ester block copolymer having a polyether block which is derived from an ethylene-oxide-capped poly-(propylene oxide)glycol, having an ethylene oxide content of 15-35% by weight and a number-averaged molecular weight of 1,500-3,000.

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 given type of polysiloxane-polycarbonate block copolymer. It has been found that the use of this given type of polysiloxane-polycarbonate block copolymer leads to a polymer mixture having improved impact strength properties. The polysiloxane-polycarbonate block copolymer used is built up from(a) 1-50% by weight of polysiloxane blocks of formula II and(b) 50-99% by weight of polycarbonate blocks of formula III, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each independently of each other represent a hydrogen atom, a hydrocarbyl or a halogenated hydrocarbyl, D is an integer from 5-140, Y is a hydrogen atom or an alkoxy, and wherein A is a bivalent hydrocarbon group having 1-15 carbon atoms, which bivalent hydrocarbon group may be substituted, is an --S--; an --S--S--; an --S--(O)--; an --S(O).sub.

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.

Abstract: The flame-retardant properties of polymers with an aromatic main chain can be improved by incorporating therein a fluorine compound in combination with a boron compound.

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.