Flame resistant polymer compositon and articles made therefrom
AssigneeCelanese International Corporation
InventorsQamer Zia, Dirk Zierer, Kirsten Markgraf, Young Shin Kim
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Abstract
Halogen-free, flame resistant polymer compositions are disclosed. The polymer composition contains a thermoplastic polymer, such as polybutylene terephthalate. The thermoplastic polymer is combined with a flame retardant that includes a phosphinate, a phosphite, and a nitrogen-containing synergist. In addition, the composition can contain a fluoropolymer and an organometallic compatibilizer. The flame resistant composition displays excellent flame resistance even when containing the thermoplastic polymer in amounts greater than 60% by weight.
Claims21
A flame resistant polymer composition consisting of:
- polybutylene terephthalate present in the polymer composition in an amount greater than about 70% by weight and less than about 97% by weight;
- a flame retardant composition of a combination of a metal phosphinate, a metal phosphite, and a nitrogen-containing synergist;
- an organometallic compatibilizer of a titanate present in an amount from about 0.05% by weight to about 2.8% by weight;
- and
- optionally, one or more components selected from the group consisting of fluoropolymers, stabilizers, lubricants, colorants, secondary amines, esters of a carboxylic acid, and organophosphorus compounds;
- wherein the metal phosphinate is present in the flame resistant polymer composition in an amount from about 10% to about 25% by weight, the metal phosphite is present in the flame resistant polymer composition in an amount from about 1% to about 7% by weight, and the nitrogen-containing synergist is present in the flame resistant polymer composition in an amount from about 0.1% to about 4% by weight;
- and
- wherein the flame resistant polymer composition displays a V-O rating at a thickness of 0.4 mm when tested according to Underwriters Laboratories Test 94 and a melt flow rate of at least 5 cm3/10 min when tested at 250° C. and at a load of 2.16 kg.
A flame resistant polymer composition consisting of:
- polybutylene terephthalate present in the flame resistant polymer composition in an amount greater than about 70% by weight and less than about 97% by weight;
- a flame retardant composition of a combination of a metal phosphinate, a metal phosphite, and a nitrogen-containing synergist;
- an organometallic compatibilizer of a titanate in an amount from about 0.05% by weight to about 2.8% by weight;
- polytetrafluoroethylene in an amount from about 0.1% to about 5% by weight;
- and
- optionally, one or more components selected from the group consisting of stabilizers, lubricants, colorants, secondary amines, esters of a carboxylic acid, and organophosphorus compounds;
- wherein the metal phosphinate is present in the flame resistant polymer composition in an amount from about 10% to about 25% by weight, the metal phosphite being present in the flame resistant polymer composition in an amount from about 1% to about 7% by weight, and the nitrogen-containing synergist being present in the flame resistant polymer composition in an amount from about 0.3% to about 4% by weight.
Dependencies are inferred from the claim text.