Compositions containing phosphono compounds and organic acids as flameproofing agents
AssigneeCiba-Geigy Corporation
InventorSalman Dermeik
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Abstract
The permanence of the flame-resistant finish of fibre materials, in particular those based on cellulose, is improved if a phosphono compound which contains an N-methylol group. is used together with an organic carboxylic acid as the finishing agent. If oxalic acid in particular is used as the carboxylic acid, the finished fibre material can be stored in a damp environment for a prolonged period of time without intermediate washing being necessary. The tendency of the finish to hydrolyse in a damp atmosphere is reduced by using the organic carboxylic acid instead of a mineral acid.
Claims8
An aqueous flame-proofing composition containing the following components:
- a) an effective flameproofing amount of a phosphono compound of the formula ##STR5## wherein R.sub.1 and R.sub.2 are independently selected from the group consisting of alkyl radicals having 1 to 4 carbon atoms and phenyl radicals which are unsubstituted or substituted by one or more halogen atoms, or wherein R.sub.1 and R.sub.2 together is selected from the group consisting of alkylene bridges having a maximum of 4 carbon atoms which are unsubstituted or substituted by one or more halogen atoms,
- X is H or CH.sub.3 and
- R.sub.3 is selected from the group consisting of hydrogen, allyl radicals and alkyl radicals having 1 to 6 carbon atoms, and
- b) an acid, selected from the group consisting of dibasic and tribasic aliphatic carboxylic acids having 2 to 6 carbon atoms and mixtures thereof, in an amount such that the pH of said composition is between 2.0 and 4.5 at 20.degree. C.
Dependencies are inferred from the claim text.