Intumescent compositions obtained by reacting polyisocyanates, phosphorus-containing substances and aromatic hydroxy carboxylic acids on salts

• US 4,338,412 A
• Filed: 06/23/1981
• Issued: 07/06/1982
• Est. Priority Date: 07/04/1980
• Status: Expired due to Fees

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: von Bonin, Wulf
• Primary Examiner(s): Welsh, Maurice J.
• Application Number:
  US06/276,559
• Time in Patent Office: 378 Days
• Field of Search: 521/157, 521/165, 528/71, 528/72
• US Class Current: 521/157
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/348 Hydroxycarboxylic acids
• CPC Class Codes: C08G 18/3889 having nitrogen in addition to phosphorus
• CPC Class Codes: C08G 18/509 having nitrogen in addition to phosphorus
• CPC Class Codes: C08G 2150/60 Compositions for foaming; Foamed or intumescent coatings

Abstract

The present invention is directed to intumescent compositions, which may be foamed, obtained by reacting:

(1) polyisocyanates,

(2) phosphorus-containing condensation products having at least one hydroxyl group and obtained by condensing (i) primary or secondary aliphatic, cycloaliphatic, aromatic, araliphatic or heterocyclic monoamines and/or polyamines, which mono- and polyamines may contain OH groups, (ii) carbonyl compounds, and (iii) dialkyl phosphites,

(3) aromatic hydroxy carboxylic acids or salts thereof, and

(4) optionally, water and/or additional organic compounds containing isocyanate-reactive hydrogen atoms.

Claims

1. Intumescent compositions, which may be foamed, obtained by reacting:

(1) polyisocyanates,

(2) phosphorus-containing condensation products having at least one hydroxyl group and obtained by condensing (i) primary or secondary aliphatic, cycloaliphatic, aromatic, araliphatic or heterocyclic monoamines and/or polyamines, which mono- and polyamines may contain OH groups, (ii) carbonyl compounds, and (iii) dialkyl phosphites,

(3) aromatic hydroxy carboxylic acids or salts thereof, and

(4) optionally, water and/or additional organic compounds containing isocyanate-reactive hydrogen atoms.

2. The compositions of claim 1 wherein, following condensation, said component (2) is alkoxylated.

3. The compositions of claim 1 obtained by reacting from 50 to 180 parts by weight of polyisocyanate with 100 parts by weight of a mixture comprising from 20 to 80% by weight of phosphorus-containing condensation products, from 10 to 65% by weight of hydroxy carboxylic acids or salts thereof, from 0 to 8.5% by weight of water, and from 0 to 50% by weight of additional organic compounds containing isocyanate-reactive hydrogen atoms.

4. The compositions of claim 1 or 3 characterized in that said polyisocyanates are of the type obtained by condensing aniline with formaldehyde, followed by phosgenation.

5. The compositions of claim 1 or 3 characterized in that the phosphorus-containing condensation products correspond to the following formula:

space="preserve" listing-type="equation">(RO).sub.2 PO--CH.sub.2 --N--CHX--CH--OH).sub.2

wherein

R represents C₁ -C₈ alkyl or C₁ -C₈ hydroxy alkyl, and

X represents H or methyl.

6. The compositions of claim 1 characterized in that hydroxy benzoic acids are used as the aromatic hydroxy carboxylic acid.