Flame retardants which contain phosphorus, and flame-retardant thermoplastic molding compositions
View Patent ↗An oligophosphate of general formula is disclosed. The oligophosphate is suitable as a flame retardant for thermoplastic molding compositions that exhibit a good flame-retardant effect, improved dimensional stability under the effect of heat, a good level of toughness and excellent flowability.
1. A compound conforming to
wherein n denotes an integer of 1 to 30.
2. A thermoplastic composition containing at least one thermoplastic resin and the compound according to claim 1 .
3. The thermoplastic composition according to claim 2 wherein the thermoplastic resin is a member selected from the group consisting of polycarbonate, polyester carbonate, polyphenylene oxide, polyester, polyamide, polyester amide, vinyl (co)polymer and acrylic/butadiene/styrene (ABS) copolymer.
4. The thermoplastic composition according to claim 2 comprising a polycarbonate, wherein, with respect to the weight of the composition, said composition contains up to 50% by weight of a graft polymer comprising 5 to 95% by weight of that polymer of at least one vinyl monomer grafted on 95 to 5% by weight of at least one rubber as graft base having a glass transition temperature lower than about 10° C.
5. The thermoplastic composition according to claim 4 wherein the graft base is a member selected from the group consisting of diene-, EP(D)M-, acrylate- and silicone rubber.
6. The thermoplastic composition according to claim 4 wherein graft polymer is an emulsion- or bulk-polymerized ABS or mixtures thereof.
7. The thermoplastic composition according to claim 2 which further contains a fluorinated polyolefin.
8. The thermoplastic composition according to claim 2 which further contains a nano-scale inorganic material or talc.
9. A molded article comprising the composition of claim 2 .