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Process for flameproofing polyurethanes
| Details |
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Inventors: Hofmann, Peter; Rohringer, Peter;
Assignee: Ciba-Geigy Corporation (Ardsley, NY)
Primary Examiner: Michl; Paul R.
Assistant Examiner:
Attorney, Agent or Firm: Hall; Luther A. R.
A process for flameproofing polyurethanes, particularly polyurethane foams, is provided. It consists in adding a reaction product from dimethyl methanephosphonate, an aliphatic diol or triol and a lower epoxide to the polyurethane components. These reaction products are non-uniform mixtures of different esters of methane phosphonic acid. |
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DETAILED DESCRIPTION We claim: 1.
An improved process for flameproofing polyurethanes using 1 to 15 percent by weight based on the polyurethane of a reactive phosphonate as flameproofing agent wherein the improvement comprises incorporating as the flameproofing agent the reaction product based on a molar ratio of (1) 1 to 2 mols of dimethyl methanephosphonate; (2) 0.
75 to 1 mol of an alkanediol or alkanetriol of 2to 6 carbon atoms; and (3) 0 to 1 mol of an epoxide having 2 to 4 carbon atoms; into a mixture of polyol and diisocyanate components from which the polyurethane is produced.
2.
A process according to claim 1, wherein the reaction component (2) is ethylene glycol, 1,2-propanediol or glycerol.
3.
A process according to claim 1, wherein the reaction component (3) is propylene oxide or ethylene oxide.
4.
A process according to claim 1, wherein a reaction product from dimethyl methanephosphonate, ethylene glycol and propylene oxide is used as flameproofing agent.
5.
A process according to claim 1, wherein a flameproofing agent is used which is obtained by reacting the components (1), (2) and (3) at 95.
degree.
to 220.
degree.
C in the presence of an alkali metal oxide, alkaline earth metal oxide or alkaline earth metal hydroxide.
6.
A polyurethane flameproofed according to the process of claim 1.
7.
A polyurethane according to claim 6 in form of a foam.
Description:
The subject of the invention is a process for flameproofing plastics, characterised in that a reaction product of 1.
A PHOSPHONIC ACID ESTER OF THE FORMULA ##STR1## wherein R and R' each denote alkyl with 1 to 4 carbon atoms, 2.
AN ALCOHOL OF THE FORMULA X--OH (2) wherein X denotes alkyl with 3 to 22 carbon atoms, hydroxyalkyl with 2 to 6 carbon atoms or halogenoalkyl with 2 to 5 carbon atoms, with the boiling point of the alcohol of the formula R--OH wherein R has the indicated meaning, which is liberated during the reaction, being at least 30.
degree.
C below the boiling point of the alcohol X--OH, and 3.
OPTIONALLY, AN EPOXIDE WITH 2 TO 4 CARBON ATOMS, IS INCORPORATED INTO THE PLASTICS
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