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US 8,541,489 B2Granted
Flame resistant semiaromatic polyamide resin composition including zinc stannate, and articles therefrom
AssigneeE. I. Du Pont de Nemours and Company
InventorYige Yin
Life of this patent
Estimating the term…
Abstract
Disclosed are polyamide compositions containing non-halogenated flame retardant and zinc stannate that have reduced corrosion effects on melt processing equipment.
Claims10
A flame retardant polyamide resin composition, comprising:
- (a) about 30 to about 90 weight percent of a polyamide component comprising about 60 to 100 weight percent of at least one semiaromatic polyamide wherein the semiaromatic polyamide is hexamethylene adipamide/hexamethylene terephthalamide copolyamide (polyamide 6,T/6,6);
- (b) at least one flame retardant comprising aluminum diethylphosphinate and/or aluminum methylethylphosphinate;
- (c) zinc stannate;
- and
- (d) 0 to about 60 weight percent of at least one inorganic reinforcing agent and/or filler,
- wherein the weight percentages of (a) and (d) are based on the total weight of the composition;
- wherein flame retardant (b) is present in an amount that is about 10 to about 45 percent of the weight of polyamide (a);
- and wherein zinc stannate (c) is present in an amount that is about 1 to about 50 percent of the weight of flame retardant (b) wherein the composition provides at least 50% less corrosion to a check ring compared to a composition having components (a), (b), and optionally (d), as measured by a Mold Corrosion Test.
5 more elements
A method for molding a flame retardant semiaromatic polyamide resin composition, comprising
- providing a blended flame retardant semiaromatic polyamide resin composition comprising
- (a) a 30 to about 90 weight percent of a polyamide component comprising about 20 to 100 weight percent of at least one semiaromatic polyamide;
- (b) at least one flame retardant comprising one or more of a phosphinate of the formula (I);
- a disphosphinate of the formula (II);
- and polymers of (I) and/or (II)
- wherein R1 and R2 are identical or different and are C1-C6 alkyl, linear or branched, and/or aryl;
- R3 is C1-C10-alkylene, linear or branched, C6-C10-arylene, -alkylarylene or -arylalkylene;
- M is calcium ions, magnesium ions, aluminum ions and/or zinc ions;
- m is 2 to 3;
- n is 1 or 3;
- and x is 1 or 2;
- (c) zinc stannate;
- and
- (d) 0 to about 60 weight percent of at least one inorganic reinforcing agent and/or filler,
- wherein the weight percentages of (a) and (d) are based on the total weight of the composition;
- wherein flame retardant (b) is present in an amount that is about 10 to about 45 percent of the weight of polyamide (a);
- and wherein zinc stannate (c) is present in an amount that is about 1 to about 50 percent of the weight of flame retardant (b);
- and
- melting and injecting said polyamide resin composition in a molding machine;
- at a temperature sufficient to provide a flowable melt;
- wherein the injecting of the resin composition comprising components (a), (b), (c) and optionally (d) provides at least 50% less corrosion of a check ring than that of injecting a resin composition comprising components (a) (b) and optionally (d);
- as measured in a Mold Corrosion Test using a molding machine having a nozzle head with said check ring.
19 more elements
Dependencies are inferred from the claim text.