# US 5,346,938 A · Smoke suppressed flame retardant unsaturated polyester resin compositions

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- Number: US 5,346,938 A
- Document ID: US5346938A
- Status: Granted
- Kind: A
- Application number: 07/725,341
- Filed: 1991-07-03
- Granted: 1994-09-13
- Earliest claimed: 1988-12-22
- Assignees: Great Lakes Chemical Corporation
- Inventors: Enrico J. Termine; Nicolai A. Favstritsky; Kevin G. Taylor
- Web page: https://patentgrep.com/patent/US5346938A

## CPC

- C07F 9/65748: {the cyclic phosphorus atom belonging to more than one ring system}
- C08K 5/527: Cyclic esters
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Smoke suppressed flame retardant thermoset resin compositions comprise smoke suppressant bicyclic phosphate compound(s), flame retardant(s) and unsaturated polyester or other thermoset materials. These compositions exhibit a reduced tendency to smoke under conditions of burning.

## Claims

### Claim 1

A smoke suppressed thermoset resin composition comprising:
a thermoset polyester resin; and
a mixture comprising:
at least one flame retardant agent selected from alumina trihydrate or magnesium hydroxide; and
a smoke suppressant comprising at least one bicyclic phosphate compound of the formula: ##STR2## where X is OH, OR' or OC(O)R'; R is H or a saturated or unsaturated straight-chain or branched-chain C.sub.1 -C.sub.17 alkyl; and R' is a saturated or unsaturated C.sub.1 -C.sub.17 alkyl.

### Claim 2 (depends on 1)

A composition, as claimed in claim 1, wherein the bicyclic phosphate compound is 2,6,7-trioxa-phosphobicyclo [2.2.2]-octane-4-methanol-1-oxide; or 2,6,7-trioxa-1-phosphobicyclo[2.2.2]-octane-4-methanol, acetate, 1-oxide.

### Claim 3 (depends on 1)

A composition as claimed in claim 1, wherein the resin is an unsaturated polyester.

### Claim 4 (depends on 1)

A composition, as claimed in claim 1, wherein the weight ratio of bicyclic phosphate compound to flame retardant agent lies in the range of about 1:25 to 20:1.

### Claim 5 (depends on 1)

A composition, as claimed in claim 1, wherein the mixture of bicyclic phosphate compound and flame retardant agent is provided in the resin composition at a level lying in the range of about 2-50 percent by weight of the overall composition.

### Claim 6 (depends on 5)

A composition, as claimed in claim 5, wherein the composition additionally comprises glass fiber reinforcements.

### Claim 7

A method for suppressing the tendency of thermoset polyester resin compositions to smoke under conditions of burning comprising the step of incorporating therein an effective amount of a mixture comprising:
a flame retardant agent selected from alumina trihydrate or magnesium hydroxide; and
a smoke suppressant comprising at least one bicyclic phosphate compound of the formula: ##STR3## where X is OH, OR' or OC(O)R'; R is H or a saturated or unsaturated straight-chain or branched-chain C.sub.1 -C.sub.17 alkyl.

### Claim 8 (depends on 7)

A method, as claimed in claim 7, wherein the bicyclic phosphate compound is 2,6,7-trioxa-phosphobicyclo [2.2.2]-octane-4-methanol-1-oxide; or 2,6,7-trioxa-1-phosphobicyclo[2.2.2]-octane-4-methanol, acetate, 1-oxide.

### Claim 9 (depends on 7)

A method, as claimed in claim 7, wherein the weight ratio of bicyclic phosphate compound to flame retardant lies in the range of about 1:25 to 20:1.

### Claim 10 (depends on 7)

A method as claimed in claim 7, where the thermoset resin composition additionally comprises glass fiber reinforcements.

### Claim 11 (depends on 1)

The composition of claim 1 and which is substantially free of ammonium compounds, amines, ureas, guanidines, guanamines, s-triazines, amino acids and peptides and salts thereof.

### Claim 12 (depends on 10)

The composition of claim 10 and which is substantially free of ammonium compounds, amines, ureas, guanidines, guanamines, s-triazines, amino acids, peptides and salts thereof.