Reference

Modified, fire-retardant polytetramethylene ether glycol

Modified, fire-retardant polytetramethylene ether glycol. Tomomatsu, Hideo (Quaker Oats Co., USA). U.S. US 4002689 11 Jan 1977, 7 pp. Division of U.S. 3,936,425. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07C043-17. NCL: 260615000R. APPLICATION: US 74-505535 13 Sep 1974. DOCUMENT TYPE: Patent CA Section: 38 (Elastomers, Including Natural Rubber) Poly(tetrahydrofuran) (I) 1:1 or 2:1 ether with 2,3-dibromo-2-butene-1,4-diol (II) [3234-02-4] maintains or improves the properties of flexible polyurethanes or polyesters prepd. from it and, in addn., is a fire retardant which is nonfugitive, nonmigratory, nonextractable, and nonvolatile in the rubber into which it is incorporated. Thus, a urethane rubber produced by polymn. of diphenylmethane 4,4'-diisocyanate with I-II 1:1 ether [58783-69-0] had burning time <3 min even in 35% O, compared with a rubber prepd. from I, which would burn any length of time between 1.25 and 4.5 min at its limiting O index of 21.25.

Fireproofed thermoplastic polyurethanes

Fireproofed thermoplastic polyurethanes. Baum, Eva; Jank, Renate; Ihle, Wolfgang; Anton, Elisabeth; Plaschil, Edgar (VEB Synthesewerk Schwarzheide, Ger.Several substances are used for example 115-96-8 and 78-43-3 which are their cas registry numbers. Dem. Rep.). Ger. (East) DD 160561 A1 14 Sep 1983, 9 pp. (German). (German Democratic Republic). CODEN: GEXXA8. CLASS: IC: C08L075-04. APPLICATION: DD 80-226360 19 Dec 1980. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Thermoplastic polyurethanes contg. brominated chain extenders, e.g. 2,3-dibromo-1,4-butenediol (I) [3234-02-4], halogenated phosphate esters, and halogenated paraffins have good processability, are self-extinguishing or nonburning, and are resistant to hydrolysis and aging. Thus, a polyester polyol (mol. wt. 2000) 100, bis(2,6-diisopropylphenyl)carbodiimide 1.7, 1,4-butanediol 15.5, I 1.8, chlorinated paraffin (50% Cl) 2.3, and tris(chloropropyl) phosphate [26248-87-3] 5.3 parts were mixed with 60 parts MDI at 55°, cast on metal at 130°, granulated, and extruded to a molding which was self-extinguishing, had tensile strength 35.8 N/mm2 and elongation 570%, and was resistant to hydrolysis. .