Reference

Cure catalyst systems for polyurethanes

Cure catalyst systems for polyurethanes. Miller, Roger L.; O'Neill, Paul L. (United States Dept. of the Navy, USA). U. S. Pat. Appl. US 669918 22 Mar 1976, 14 pp. Avail. NTIS. (English). (United States of America). CODEN: XAXXAV. APPLICATION: US 76-669918 22 Mar 1976. DOCUMENT TYPE: Patent CA Section: 50 (Propellants and Explosives) Section cross-reference(s): 38 The title systems for propellant binders are provided by incorporating compds. which react and form the catalyst during polymn. of the binder, thus providing longer pot life and increasing catalyst concn. which assures a firm cure. Catalytically inefficient organometallics are provided which are converted to catalysts contg. C-O-M bonds, where M is Bi or Fe. Thus, a nitro plasticizer 15, diol 8.08, triol 0.69, diisocyanate 1.23, triphenyl Bi [603-33-8] 0.06%, and HMX [2691-41-0] 74.04 wt.% gave a rubbery compn. with pot life 17 h and 72 h cure time at 60.degree.. The catalytic activity resulted from the Bi salts formed with the impurities in the plasticizer.

Polymerization of 1-chloro-2-phenylacetylene by molybdenum pentachloride-based catalysts

Polymerization of 1-chloro-2-phenylacetylene by molybdenum pentachloride-based catalysts. Masuda, Toshio; Yamagata, Makoto; Higashimura, Toshinobu (Dep. Polym. Chem., Kyoto Univ., Kyoto 606, Japan). Macromolecules, 17(2), 126-9 (English) 1984. CODEN: MAMOBX. ISSN: 0024-9297. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Polymn. of 1-chloro-2-phenylacetylene (I) catalyzed by mixts. of MoCl5 with various organometallics of main-group metals provided in high yields a polymer [81953-16-4] of wt.-av. mol. wt. (1-12) ′ 105. Bu4Sn [1461-25-2], Et3SiH [617-86-7], and Ph3Bi [603-33-8] were esp. effective among the organometallic cocatalysts examd. Arom. and halogenated hydrocarbons were useful polymn. solvents. The polymer was a light yellow sol. solid. On the other hand, I gave mainly a MeOH-sol. oligomer in the presence of MoCl5 alone. 603-36-1 and 1461-25-2 are just another two chemicals used in this study. It was inferred that the polymn. and the oligomerization proceed via a metal carbene and an alkynylmetal, resp. .