LOW FLAME SPREAD POLYURETHANE FOAM CONTAINING BROMINE-CONTAINING POLYESTER RESIN

• US 3,676,376 A
• Filed: 01/04/1971
• Issued: 07/11/1972
• Est. Priority Date: 01/04/1971
• Status: Expired due to Term

• Current Assignee: Glenn R. Svoboda, Ronald W. Reineck
• Original Assignee: Glenn R. Svoboda, Ronald W. Reineck
• Inventors: Svoboda, Glenn R., Reineck, Ronald W.
• Primary Examiner(s): Czaja, Donald E.
• Assistant Examiner(s): Rzucidlo, Eugene C.
• Application Number:
  US05/103,913
• Time in Patent Office: 554 Days
• Field of Search: 260/2.5AN,2.5AV,2.5AJ,75H,75NK,2.5AP,2.5AS
• US Class Current: 521/171
• CPC Class Codes: C08G 18/4607 having halogens

Abstract

A low-flame spread rating polyurethane foam includes as one of its polyol ingredients saturated polyester composition of low acid value having 20 to 30 percent bromine by weight and an -OH value of 350-550 formed from A. TETRABROMOPHTHALIC ANHYDRIDE OR ACID; B. AN ALIPHATIC DICARBOXYLIC ACID; C. A POLYOL; D. AN ALIPHATIC DIOL. The polyester preferably has a viscosity less than 500,000 centipoises at 25* C. In such low-flame spread forms, the polyester is combined with prepolymers of a polyether polyol and a polyisocyanate, preferably polymethylene polypehnylene polyisocyanate.

Claims

2. The polyurethane foam of claim 1 wherein the said polyester has a viscosity of less than 500,000 centipoises at 25* C.

3. The polyurethane foam of claim 1 wherein the said aliphatic dicarboxylic acid is adipic acid.

4. The polyurethane foam of claim 1 wherein the said diol is 1, 6-hexane diol.

5. The polyurethane foam of claim 1 wherein the said polyol is a triol.

6. The polyurethane of claim 1 wherein the said polyester comprises the polyesterification reaction product of 10-15 mols of trimethylol propane;

1-2 mols of 1,6-hexane diol;

4-5 mols of adipic acid;

2.5-3 mols of tetrabromophthalic acid or anhydride.

7. The polyurethane foam of claim 1 wherein the said polyester has an acid value less than 2.

8. The polyurethane foam of claim 1 wherein the said polyisocyanate is a prepolymer formed by reacting polymethylene polyphenylene polyisocyanate with polyether polyol.

9. The polyurethane foam of claim 8 wherein the said polyether polyol is the alkylene oxide adduct of methyl glucoside.

10. The polyurethane foam of claim 1 having a flame spread index less than 25 in the ASTM E-84 test.