IGNITION RESISTANT THERMOPLASTIC POLYMER COMPOSITIONS
Publication Date: 2003-Mar-13
The IP.com Prior Art Database
This invention relates to ignition resistant polymer compositions comprising a thermoplastic polymer, preferably a carbonate polymer composition comprising a phosphorous compound. This invention relates particularly to halogen-free ignition resistant carbonate polymer compositions having a good balance of physical properties and rated V-2 in the Underwriters Laboratories Standard 94 (UL 94) flammability test and articles molded therefrom.
RESISTANT THERMOPLASTIC POLYMER COMPOSITIONS
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This invention relates to ignition resistant polymer compositions comprising a thermoplastic polymer, preferably a carbonate polymer composition comprising a phosphorous compound.� This invention relates particularly to halogen-free ignition resistant carbonate polymer compositions having a good balance of physical properties and rated V-2 in the Underwriters Laboratories Standard 94 (UL 94) flammability test and articles molded therefrom.
It has surprisingly now been found that it is possible to impart UL 94 V-2 ignition resistance to a carbonate polymer, in particular, a carbonate polymer, a styrene-based polymer, or blends thereof, by means of a moderate amount of a phosphorous compound without the aid of tetrafluoroethylene polymers or copolymers.� The ignition resistant carbonate polymer compositions of the present invention are especially useful in the preparation of molded articles, notably parts required to meet UL 94 V-2 rating or better.� These compositions are particularly suited for use in thinwall instrument housings such as for power tools, appliances, consumer electronic equipment such as TVs, VCRs, web appliances, electronic books, etc., or information technology equipment such as telephones, computers, monitors, fax machines, battery chargers, scanners, copiers, printers, hand held computers, etc.
Component (a) in the ignition resistant polymer composition of the present invention is a thermoplastic polymer.� The thermoplastic polymer can be a homopolymer or a copolymer.� Preferably, the thermoplastic polymer can be a polyolefin (PO) such as polyethylene (PE), and polypropylene (PP) made by conventional Ziegler-Natta or metallocene catalysts; a styrene-based polymer, such as polystyrene (PS), impact modified polystyrene, for example, high-impact polystyrene (HIPS), or polystyrene copolymers, for example, styrene and acrylonitrile copolymer (SAN), styrene graft polymers, for example, acrylonitrile, styrene, and butadiene terpolymer (ABS); a polyphenylene oxide (PPO), a polyester such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET); a polycarbonate (PC); a polyamide polymer, for example, nylon; a thermoplastic polyurethane (TPU, for example, PELLATHANETM or ISOPLASTTM made by The Dow Chemical Company); or blends thereof.�
� � � � � � � � � � � Suitable carbonate polymers employed in the present invention are well known in the literature and can be prepared by known techniques.� Preferably the polycarbonate is prepared from one or more aromatic diols such as bisphenol A.� The carbonate polymers can be prepared from these raw materials by any of several known processes such as the known interfacial, solution or melt processes.� The carbonate polymers of the present invention may be linear, branched or mixtures thereof.� Post consumer recycle polycarbonate is also suitable for use in the present invention.
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