Flame retardant mixture of polybrominated diphenyl oxide and organic diphosphate

• US 5,547,614 A
• Filed: 10/18/1994
• Issued: 08/20/1996
• Est. Priority Date: 11/14/1989
• Status: Expired due to Fees

• Current Assignee: Supresta U.S. LLC (ICL Group Ltd.)
• Original Assignee: Akzo Nobel N.V. (Nouryon BV)
• Inventors: Fesman, Gerald, Aaronson, Alan M.
• Primary Examiner(s): Tucker, Philip
• Assistant Examiner(s): ANTHONY, JOSEPH DAVID
• Application Number:
  US08/324,862
• Time in Patent Office: 672 Days
• Field of Search: 558/164, 252/609
• US Class Current: 252/609
• CPC Class Codes: C08K 5/06 Ethers; Acetals; Ketals; Ortho-esters
• CPC Class Codes: C08K 5/523 with hydroxyaryl compounds
• CPC Class Codes: C08L 75/04 Polyurethanes

Abstract

A flame retardant mixture, suitable for use in polyurethane foams, comprises a polybrominated diphenyl oxide (e.g., pentabromodiphenyl oxide) and an organic diphosphate (e.g., an aromatic diphosphate). A small amount of triaryl phosphate can also be present for viscosity reduction purposes.

Claims

1. A flame retardant mixture for polymers which consists essentially of:

(a) a polybrominated diphenyl oxide;

(b) an organic diphosphate of the formula;

##STR4## where Ar is substituted or unsubstituted aryl and R is alkylene; and

(c) up to 20% by weight of triaryl phosphate.

2. A mixture as claimed in claim 1 wherein (a) is pentabromodiphenyl oxide.

3. A mixture as claimed in claim 1 wherein Ar is unsubstituted aryl and R is branched alkylene.

4. A mixture as claimed in claim 3 wherein R is neopentyl.

5. A mixture as claimed in claim 1 wherein the weight ratio of (a) to (b) is from about 50:

50 to about 85;

15.

6. A mixture as claimed in claim 5 wherein Ar is unsubstituted aryl, R is branched alkylene, and (b) is pentabromodiphenyl oxide.

7. A mixture as claimed in claim 6 wherein R is neopentyl.