Flame resistant aromatic polyamide resin composition and articles therefrom
View Patent ↗The present invention relates to a flame resistant polyamide resin compositions for moulded articles and articles formed therefrom, comprising aromatic polyamide with phosphinate and/or diphosphinate flame retardant and, optionally, glass fibers. Further provided are articles for use in a variety of applications including electrical and electronic parts requiring electrical insulation.
1. A flame retardant polyamide resin composition, comprising:
(a) about 20 to about 90 weight percent of an aromatic polyamide that is derived from about 5 to about 75 mole percent of aromatic monomers;
(b) about 10 to about 40 weight percent of a flame retardant comprising one or more of a phosphinate of the formula (I), a disphosphinate of the formula (II), or polymers of these
wherein R 1 and R 2 are identical or different or are C 1 -C 6 alkyl, linear or branched, and/or aryl; R 3 is C 1 -C 10 -alkylene, linear or branched, C 6 -C 10 -arylene, -alkylarylene or -arylalkylene; M is one or more of calcium ions, magnesium ions, aluminum ions and zinc ions, m is 2 to 3; n is 1 or 3; x is 1 or 2; and
(c) 0 to about 60 weight percent of inorganic reinforcing agent and/or filler;
(d) about 0.5 to about 8 weight percent of a synergist comprising boehmite,
the above stated percentages being based on the total weight of the composition.
2. The flame retardant polyamide resin composition of claim 1 , further comprising one or more antioxidants.
3. The flame retardant polyamide resin composition of claim 2 , wherein the one ore more antioxidants are selected from one or more of phenolic antioxidants, thioether antioxidants, and phosphite antioxidants.
4. The flame retardant polyamide resin composition of claim 1 , wherein the aromatic polyamide is at least one selected from polyamide 6, T/6,6; polyamide 6, T/D,T; polyamide 6, T/6,I; polyamide MXD,6; polyamide 12, T; polyamide 10, T; and polyamide 9, T.
5. The flame retardant polyamide resin composition of claim 1 , wherein the inorganic reinforcing agent is glass fibers.
6. The flame retardant polyamide resin composition of claim 1 wherein the flame retardant (c) comprises one or both of aluminum diethylphosphinate or aluminum methylethylphosphinate.
7. A molded article comprising the flame resistant polyamide resin composition of any of claims 1 - 4 , 5 or 6 .
8. The molded article of claim 7 , selected from the group consisting of connector housings, breaker housings, and contactor housings.
9. The molded article of claim 8 as an electrical connector.