Flame retardant for polyurethanes
AssigneeEthyl Corporation
InventorHenry J. Barda
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Abstract
A reactive fire retardant mixture useful in the preparation of polyurethane foams. The mixture contains a halogenated imide-containing polyol having the formula: ##STR1## and the corresponding ether having the formula: ##STR2## wherein R is a hydrocarbon group having the valance n+2 and is selected from the group consisting of benzene groups, naphthalene groups and alicyclic hydrocarbon groups containing 5 to 10 carbon atoms, R' is an aliphatic hydrocarbon group containing 3-12 carbon atoms, X is selected from the group consisting of bromine and chlorine, n is an integer from 1-6 and p is an integer from 2-6. They are prepared by reacting an alcohol (e.g. isopropyl alcohol), a halogenated dicarboxylic anhydride (e.g. tetrabromophthalic anhydride) and an aminopolyol (e.g. 2-amino-2-ethyl-1,3-propanediol).
Claims10
A reactive flame retardant mixture comprising about 1-99 weight percent of a halogenated imide-containing polyol having the formula:
- ##STR21## and about 99-1 weight percent of the corresponding ether having the formula:
- ##STR22## wherein R is a hydrocarbon group having the valence n+2 and is selected from the group consisting of benzene groups, naphthalene groups and alicyclic hydrocarbon groups containing 5 to 10 carbon atoms, R' is an aliphatic hydrocarbon group containing 3-12 carbon atoms, X is selected from the group consisting of bromine and chlorine, n is an integer from 1-6 and p is an integer from 2-6.
A process for preparing a reactive flame retardant mixture, said process comprising reacting at a temperature of about 50.degree.-350.degree. C.
- (a) about one mole of a halogenated dicarboxylic anhydride compound having the structure:
- ##STR27## wherein R is a hydrocarbon group having the valence n+2 and is selected from the group consisting of benzene groups, naphthalene groups and alicyclic hydrocarbon groups containing 5 to 10 carbon atoms, X is selected from the group consisting of bromine and chlorine and n is an integer from 1 to 6,
- (b) about 0.8-50 moles of an alcohol containing 1-10 carbon atoms and
- (c) about 0.5-2.5 moles of an aminopolyol having the structure:
- H.sub.2 N--R'--OH).sub.p
- wherein R' is an aliphatic hydrocarbon group containing 2-6 carbon atoms having the valence p+1 and p is an integer from 2-6.
A process for preparing a reactive flame retardant mixture, said process comprising reacting at a temperature of about 50.degree.-350.degree. C.
- (a) about one mole of a halogenated dicarboxylic anhydride compound having the structure:
- ##STR28## wherein R is a hydrocarbon group having the valence n+2 and is selected from the group consisting of benzene groups, naphthalene groups and alicyclic hydrocarbon groups containing 5 to 10 carbon atoms, X is selected from the group consisting of bromine and chlorine and n is an integer from 1 to 6 and
- (b) about 0.8-50 moles of an alcohol containing 1-10 carbon atoms to form an acid-ester intermediate and reacting said intermediate with
- (c) about 0.5-2.5 moles of an aminopolyol having the structure:
- H.sub.2 N--R'--OH).sub.p
- wherein R' is an aliphatic hydrocarbon group containing 2-6 carbon atoms having the valence p+1 and p is an integer from 2-6.
Dependencies are inferred from the claim text.