Patent ID: 6380273
Filing Date: 2002-04-30
Classification: C08J

Abstract:
A process for the production of flame-resistant flexible polyurethane foams having a low susceptibility to core discoloration, which comprises using hydroxyalkyl phosphonates as halogen-free flame retardants and as core discoloration inhibitors, wherein the hydroxyalkyl phosphonates conform to the general formula I in whichu denotes a chaint length of from 0 to 10 R1 and R5 are identical, or different and are a hydroxyl-containing radical of the general formula II R2 and R4 are identical or different and are an alkyl, aryl or alkylaryl group having 1 to 12 carbon atoms R3 is a radical of the general formula III {overscore (a)} denotes an average chain length of from 0 to 4 {overscore (i)} denotes an average chain length of from 0 to 4 R6, R7, R8 and R9 are identical or different and are, independently of one another, H or an alkyl group having 1 to 6 carbon atoms.