Patent GB-927281-A (GB)
Title: Organic antimony complexes
Inventor: WILLIAMS LESLIE
IPC: C07F9/90
Filed: 1958-08-27
Abstract: A flame retardant additive for resins, particularly polyvinyl chloride and polyurethane resins, comprises an antimony complex prepared by reacting an antimony trialkoxide with an ester of a hydroxy carboxylic acid (the carboxylic group being that which is esterified), each mole of alkoxide being reacted with 1 to 3 moles of ester.  The esters may be mixed esters and may be derived from lactic, malic, tartaric, citric or salicylic acids, while the esterifying alcohol may be a C1-12 saturated or unsaturated alcohol or benzyl alcohol or their halogenated derivatives.  The alkoxide may be derived from a C1-5 alkanol.  In examples: "antimony dibutyl tartrate" is incorporated in (1) a P.V.C., allyl phthalate, "Epikote" (Registered Trade Mark) 834 mix and (2) a polyester, diisocyanate, dibromopropyl tartrate mix which is processed into a foam.  The second Provisional Specification refers to the use of bromine-containing compounds, particularly esters of bromo alcohols with hydroxy acids and also high boiling bromo esters such as dibromopropyl maleates, fumarates, succinates and phthalates as fire-retardant additives for polyurethane resins. Antimony compounds may be used in conjunction with the bromo compounds, e.g. antimony oxide, alkoxides, acylates or mixed alkoxides/acylates or the antimony complexes disclosed above, particularly ones containing bromine when the same compound may provide both the bromine and the antimony.  In an example a polyurethane foam is produced by adding diphenylmethane 4,41-diisocyanate to a polyester mix containing di-(2,3-dibromopropyl) tartrate and antimony oxide.  Specification 837,696 is referred to.ALSO:An antimony complex is prepared by reacting an antimony trialkoxide with an ester of a hydroxy carboxylic acid (the carboxylic group being that which is esterified), each mole of alkoxide being reacted with 1 to 3 moles of ester.  The esters may be mixed esters and may be derived from lactic, malic, tartaric, citric or salicylic acids, while the esterifying alcohol may be a C1\12 saturated or unsaturated alcohol, or benzyl alcohol or their halogenated derivatives.  The alkoxide may be derived from a C1-5 alkanol.  Examples describe the preparation of compounds designated antimony dibutyl tartrate, antimony diethyl tartrate and antimony 2,3-dibromo-propyl tartrate.  The products are used to impart flame retardant properties to resins (see Groups IV(a) and V).  Specification 837,696 is referred to.ALSO:A flame retardent additive for resins, particularly foamed polyurethane resins, comprises an antimony complex prepared by reacting an antimony trialkoxide with an ester of a hydroxy carboxylic acid (the carboxylic group being that which is esterified), each mole of alkoxide being reacted with 1 to 3 moles of ester.  The esters may be mixed esters and may be derived from lactic malic, tartaric, citric or salicylic acids, while the esterifying alcohol may be a C1-12 saturated or unsaturated alcohol or benzyl alcohol or their halogenated derivatives.  The alkoxide may be derived from a C1-5 alkanol.  In Example (2) "antimony dibutyl tartrate" is incorporated in a polyester, diisocyanate, dibromopropyl tartrate mix which is processed into a foam.  The second Provisional Specification refers to the use of bromine-containing compounds, particularly esters of bromo alcohols with hydroxy acids and also high boiling bromo esters such as dibromopropyl maleates, fumerates, succinates and phthalates as fire-retardent additives for polyurethane resins. Antimony compounds may be used in conjunction with the bromo compounds, e.g. antimony oxide, alkoxides, acylates or mixed alkoxides/acylates or the antimony complexes disclosed above, particularly ones containing bromine when the same compound may provide both the bromine and the antimony.  In an example a polyurethane foam is produced by adding diphenylmethane 4, 41-diisocyanate to a polyester mix containing di-(2, 3-dibromopropyl) tartrate and antimony oxide.  Specification 837,696 is referred to.