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US 4,229,554 AGranted
Flame retardant antistatic additives and antistatic fibers
AssigneeBASF Wyandotte Corporation
InventorsDavid D. Newkirk, Robert B. Login, Basil Thir
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AssigneeBASF Wyandotte Corporation
InventorsDavid D. Newkirk, Robert B. Login, Basil Thir
Estimating the term…
Flame-retardant antistatic polymer additives are provided which inhibit the buildup of electrostatic charges upon the addition of such compositions to synthetic polymeric fibers, i.e., polyamide fibers, and at the same time do not contribute to the flammability characteristics of such polymeric fibers. The flame-retardant antistatic polymer compositions are useful in combinations with fibers such as polyamide, polyester, polyurea, polyurethane, polysulfonamide, polyolefin and polyacrylic fibers. The antistatic effect is obtained by the process of coating the fibers or dispersing in or on the fibers up to about 12 percent by weight of a polymer composition which is the reaction product of: (a) a polyoxyalkylene compound or polyester thereof and (b) at least one reactant selected from the group consisting of (1) a diol, (2) a polyester and (3) an aliphatic or aromatic diacid or derivative of (3), wherein at least one said reactant is halogenated. Improved flame-retardant properties can be obtained by including with the flame-retardant, antistatic polymer composition an effective flame retardant proportion of a compound containing a metal from group Vb of the periodic table. Generally about 1:4 to about 4:1 parts halogen to antimony compound is used. Such compounds are oxides of metals such as phosphorus, arsenic, antimony, or bismuth with the preferred compound being antimony trioxide.
A flame-retardant antistatic polymer comprising the reaction product of
Dependencies are inferred from the claim text.
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Containing halogens: derived from polycarboxylic acids and polyhydroxy compounds
With oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond: oxides or hydroxides of elements…
With phosphorus or compounds thereof, e.g. with chlorophosphonic acid or salts thereof: with oxides of phosphorus; with hypophosphorous,…
Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyesters
Term ended 21 Oct 1997 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The invention relates to antistatic additives for textile fibers, particularly for polyamide fibers, which have reduced flammability as compared to prior art antistatic additives.
2. Description of the Prior Art
A flame-retardant antistatic polymer of the invention was prepared by obtaining a halogen containing substantially hydroxyl-terminated polyester of tetrabromophthalic anhydride and ethylene glycol. This was then chemically reacted with a polyester of a chain extended tetrol based on a diamine by combining said tetrol based polyester with said halogen containing polyester and cross-linking the mixture using dimethyl terephthalate.
Specifically, the flame-retardant antistatic polymer of the invention was prepared by utilizing a four-neck, four-liter, round bottom reaction flask equipped with a stirrer, temperature control well, condenser and nitrogen inlet. Into this flask there was charged 79.5 grams (1.28 moles) of ethylene glycol, 0.9 gram (0.009 mole) of potassium acetate, and 500 grams (1.05 moles) of tetrabromophthalic anhydride. The mixture was refluxed at 180.degree. C. for 15 minutes. More potassium acetate was added (0.9 gram) and reflux continued for 1 hour and 15 minutes. The condenser was then replaced by a distillation head and the mixture heated to 180.degree. C. to 190.degree. C. at atmospheric pressure. After 2 hours, 5 grams (0.08 mole) of ethylene glycol was added and heating continued at atmospheric pressure for 3 hours. The bromine-containing polyester obtained had an acid number of 35.2 and an OH number of 38.8.
Into a one-liter, four-neck, round bottom flask equipped with a mechanical stirrer, temperature control well, nitrogen inlet and a vacuum distillation head and a condenser there was charged 640 grams of a chain extended tetrol based on a diamine sold under the trademark "TETRONIC.RTM. 1504" having a molecular weight of 12,500 together with 0.53 gram of 85 percent phosphoric acid. The reaction mixture was evacuated to 0.4 millimeter of mercury and stripped for 40 minutes at 160.degree. C. After vacuum was relieved with nitrogen, 8.4 grams of dimethyl terephthalate was added to the reaction mixture which was then evacuated to 0.4 millimeter and stripped at 160.degree. C. for 25 minutes. After this time the sample had a viscosity of 10,300 centipoises (Brookfield at 100.degree. C.). After stripping an additional hour, there was added to the reaction mixture 1.5 grams of dimethyl terephthalate, 1.0 gram of sodium methoxide and 80.0 grams of the halogen-containing polyester prepared above. The mixture was stirred for 10 minutes and vacuum stripping was then carried out at 160.degree. C. at a vacuum of about 1 millimeter of mercury over a period of 90 minutes. There was then added 0.5 gram of an 85 percent phosphoric acid solution. After another 35 minutes of vacuum stripping the resultant flame-retardant antistatic polymer had a viscosity of 24,000 centipoises (Brookfield at 100.degree. C.), an OH number of 9.2, an acid number of 0.54 and a bromine content of 6.9 percent.