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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
First Claim
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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.

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