# US 5,710,202 A · Flame retardant composition

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- Number: US 5,710,202 A
- Document ID: US5710202A
- Status: Granted
- Kind: A
- Application number: 08/905,871
- Filed: 1997-08-04
- Granted: 1998-01-20
- Earliest claimed: 1996-01-05
- Inventors: Gerard W. Kuckro
- Web page: https://patentgrep.com/patent/US5710202A

## CPC

- C08K 3/38: Boron-containing compounds
- C08K 5/092: Polycarboxylic acids
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A flame retardant composition is provided which is less expensive to produce than prior compositions and yet which exhibits desirable insulation properties, flame and fire resistance, and which, when ignited, does not emit noxious smoke or corrosive gases. The crosslinkable flame retardant composition includes a copolymer of ethylene and a vinyl ester of a C.sub.2-6 aliphatic carboxylic acid, a hydrated inorganic filler, and a coupling agent.

## Claims

### Claim 1

A crosslinkable flame retardant composition consisting of :
(a) a copolymer of ethylene and a vinyl ester of a C.sub.2-4 aliphatic carboxylic acid;
(b) a hydrated inorganic filler selected from the group consisting of hydrated calcium borate, hydrated aluminum oxides, hydrated magnesia, hydrated calcium silicate, and mixtures and blends thereof; and
(c) a coupling agent comprising oxalic acid, said composition characterized by the absence of silane compounds.

### Claim 2 (depends on 1)

A crosslinkable flame retardant composition as claimed in claim 1 wherein said hydrated inorganic filler comprises calcium borate pentahydrate.

### Claim 3 (depends on 1)

A crosslinkable flame retardant composition as claimed in claim 1 wherein said hydrated inorganic filler comprises a mixture of calcium borate pentahydrate and hydrated aluminum oxide.

### Claim 4 (depends on 1)

A crosslinkable flame retardant composition as claimed in claim 1 wherein said copolymer comprises from about 9 to about 24% by weight vinyl acetate.

### Claim 5 (depends on 1)

A crosslinkable flame retardant composition as claimed in claim 1 wherein said composition also includes a chemical crosslinking agent.

### Claim 6 (depends on 5)

A crosslinkable flame retardant composition as claimed in claim 5 wherein said composition also includes two or more chemical crosslinking agents.

### Claim 7 (depends on 1)

A crosslinkable flame retardant composition as claimed in claim 1 wherein said composition also includes an antioxidant selected from the group consisting of trimethyldihydroquinoline, 4,4'-thiobis(6-tert-butyl-m-cresol), 4,4'-butylidenbis-(6-tert-butyl-m-cresol), and 2,2'-methylene-bis(4-methyl-6-tert butylphenol).

### Claim 8 (depends on 1)

A flame retardant composition as claimed in claim 1 in which said composition has been crosslinked.

### Claim 9

A crosslinkable flame retardant composition consisting of:
(a) 100 parts by weight of a copolymer of ethylene and a vinyl ester of a C.sub.2-6 aliphatic carboxylic acid;
(b) from 80-400 parts by weight of a hydrated inorganic filler selected from the group consisting of hydrated calcium borate, hydrated aluminum oxides, hydrated magnesia, hydrated calcium silicate, and mixtures and blends thereof;
(c) from 0.25-5 parts by weight of a coupling agent comprising oxalic acid; and
(d) from 1-8 parts by weight of a chemical crosslinking agent, said composition characterized by the absence of silane compounds.

### Claim 10 (depends on 9)

A crosslinkable flame retardant composition as claimed in claim 9 wherein said hydrated inorganic filler comprises calcium borate pentahydrate.

### Claim 11 (depends on 9)

A crosslinkable flame retardant composition as claimed in claim 9 wherein said hydrated inorganic filler comprises a mixture of calcium borate pentahydrate and hydrated aluminum oxide.

### Claim 12 (depends on 9)

A crosslinkable flame retardant composition as claimed in claim 9 wherein said composition also includes an antioxidant selected from the group consisting of trimethyldihydroquinoline, 4,4'-thiobis(6-tert-butyl-m-cresol), 4,4'-butylidenbis-(6-tert-butyl-m-cresol), and 2,2'-methylene-bis(4-methyl-6-tert butylphenol).

### Claim 13 (depends on 9)

A flame retardant composition as claimed in claim 9 in which said composition has been crosslinked.