# US 8,541,489 B2 · Flame resistant semiaromatic polyamide resin composition including zinc stannate, and articles therefrom

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- Number: US 8,541,489 B2
- Document ID: US8541489B2
- Status: Granted
- Kind: B2
- Application number: 12/217,031
- Filed: 2008-07-01
- Published: 2010-01-07
- Granted: 2013-09-24
- Earliest claimed: 2008-07-01
- Assignees: E. I. Du Pont de Nemours and Company
- Applicants: Yige Yin
- Inventors: Yige Yin
- Web page: https://patentgrep.com/patent/US8541489B2

## CPC

- C08K 5/5313: Phosphinic compounds, e.g. R2=P(:O)OR'
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Disclosed are polyamide compositions containing non-halogenated flame retardant and zinc stannate that have reduced corrosion effects on melt processing equipment.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the zinc stannate (c) is present in an amount that is about 1.5 to about 40 percent of the weight of flame retardant (b).

### Claim 3 (depends on 1)

The composition of claim 1, wherein the at least one inorganic reinforcing agent and/or filler is present in about 5 to about 60 weight percent, based on the total weight of the composition.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the inorganic reinforcing agent is glass fibers.

### Claim 5 (depends on 1)

The composition of claim 1, wherein the zinc stannate is present in an amount that is about 1.5 to about 40 percent of the weight of the flame retardant.

### Claim 6 (depends on 1)

The composition of claim 1 further comprising 0.2 to 4 wt. % of the zinc stannate, based on the total weight of the composition.

### Claim 7 (depends on 1)

The composition of claim 1 further comprising 1 to 4 wt. % of the zinc stannate, based on the total weight of the composition.

### Claim 8 (depends on 1)

The composition of claim 1, wherein the zinc stannate is ZnSnO3.

### Claim 9 (depends on 1)

An article comprising the composition of claim 1.

### Claim 10

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.