Patent GB-821503-A (GB)
Title: Polymeric compositions containing nitrilo methylol-phosphorus polymers and bromine
IPC: C08G79/02
Filed: 1955-11-07
Abstract: A thermosetting composition for flame-proofing textiles comprises (1) a polymer prepared by condensing a tetrakis (hydroxymethyl) phosphonium salt or tris (hydroxymethyl) phosphine oxide or a derivative thereof containing several hydroxymethyl groups, with at least one organic nitrogen compound having a molecular weight of not more than 800 and a trivalent nitrogen atom to which is attached at least 2 hydrogen atoms and/or methylol groups, and (2) a non-volatile organic bromine derivative containing at least 10% by weight of bromine attached to carbon, the composition comprising at least 3% by weight of phosphorus present in a phosphonium and/or phosphine radical, and for every part of such phosphorus, 0.5 to 15 parts of bromine attached to carbon, and 0.5 to 15 parts of trivalent nitrogen. The nitrilo-methylol-phosphorus polymers are described in Specifications 740,269, 761,985 and 764,313.  Examples of bromine derivatives are: polybromo alcohol neutral esters of phosphonitrilic halides, e.g. 2,3-dibromopropyl esters of phosphonitrilic chlorides, described in U.S.A.  Specification 2,681,295; polymeric adducts of bromohydrocarbons and unsaturated esters of phosphorus nitrilic halides, described in Specification 821,505, polymeric adducts of N-alkenylated melamines and polybromo-hydrocarbons and optionally up to 20% of a lower aliphatic aldehyde, and polymeric adducts of polybromo-hydrocarbons and polymerizable acrylamides and optionally up to 20% by weight of a lower aliphatic aldehyde, as described in Specification 807,236; polymeric adducts of polybromohydrocarbons and polymerizable trialkenyl phosphates, described in U.S.A. Specifications 2,686,768, 2,686,769 and 2,778,747; and brominated polymers of trialkyl phosphate and other similar polymers described in U.S.A. Specifications 2,660,524 and 2,660,543.  Some of the bromine can be contained in the nitrilo-methyl-phosphorus polymer, obtained as described in Specification 807,236.  When applied to textiles, the bromine derivative and the nitrilo-phosphorus adduct may be applied separately or together in the form of a solution or dispersion. The nitrilo-phosphorus adduct is preferably in a further polymerizable form and is insolubilized in situ by heating or by reaction with ammonia.  In the Examples: (1) and (2) cloth is first treated with a solution in acetone of 2,3-dibromopropyl diester of PNCl2, washed and dried, and further treated with an aqueous solution containing THPC, methylol melamine and urea; (3), (4) and (5) the composition comprises a mixture of an emulsion of the reaction product of allyl neutral ester of a phosphonitrilic chloride with bromoform and an aqueous solution of THPC, methylol melamine, urea and triethanolamine; (6) an adduct of triallyl phosphate and bromoform is added to an aqueous solution of THPC, methylol melamine, urea and triethanolamine; (7) 2,3-dibromopropyl ester of PNCl2 is dissolved in chloroform, emulsified with 2% aqueous polyvinyl alcohol and mixed with an aqueous solution of THPC, methylol melamine, urea and triethanolamine.  Specifications 764,314, 775,325 and 821,504 also are referred to.