Reference

Sound absorbing structure

Sound absorbing structure. Yudovich, S. Z.; Speranskii, B. S.; Dubina, V. I.; Simonov, A. I.; Ovcharov, I. G.; Tilik, V. T.; Belosevich, V. K.; D'yachenko, V. N.; Ocheret'ko, V. P.; Sychuk, Yu. T. (Zaporozhe Machine-Building Institute, USSR). U.S.S.R. SU 1136953 A1 30 Jan 1985 From: Otkrytiya, Izobret. 1985, (4), 46. (Russian). (Union of Soviet Socialist Republics). CODEN: URXXAF. CLASS: ICM: B32B015-08. APPLICATION: SU 83-3584874 21 Apr 1983. DOCUMENT TYPE: Patent CA Section: 55 (Ferrous Metals and Alloys) Section cross-reference(s): 38 The sound-absorbing structure with increased effectiveness contains outer steel [12597-69-2] sheets and an intermediate layer produced from a polymeric material contg. epoxy resin 40-60, polyethylene polyamide 3-7, dibutylphthalate [84-74-2] 10-20, and granular graphite 20-40%.

Preparation of foams from a polyisocyanate compound and a plastic emulsion

Preparation of foams from a polyisocyanate compound and a plastic emulsion. (Nippon Polyurethane Industry Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59189115 A2 26 Oct 1984 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G018-14. APPLICATION: JP 83-62282 11 Apr 1983. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Foams are prepd. by blending an aq. plastic emulsion and a polyisocyanate compd. prepd. by reaction of (1) 100 parts polyisocyanate (diphenylmethane diisocyanate or its deriv.) 100, (2) 1-20 parts poly(ethylene oxide) deriv. RO(CH2CH2O)nH or R1(OCH2CH2)mO2CCH2CO2(CH2CH2O)nR1 (R, R1 = C1-4 alkyl; n, m = 5-120), and (3) a polyether diol and/or a polyether triol contg. ethylene oxide and propylene oxide residues in molar ratio 1:0-3 and having mol. wt. 200-6000, at the mol ratio NCO/OH = 2-20. The polyisocyanate compds. show excellent dispersibility in water and react rapidly with the aq. plastic emulsions to produce uniform foams which are useful for construction. Thus, 100 parts polyphenylmethane polyisocyanate [9016-87-9] was allowed to react with 8 parts polyethylene glycol mono-Me ether [9004-74-4] (mol. wt. 700) and 100 parts block polyether (mol. wt. 2500; prepd. from H2O and 1:2 ethylene oxide-propylene oxide) to form a polyisocyanate compd. The compd. (100 parts) was mixed with 0.5 part silicone foam stabilizer and 100 parts dibutyl phthalate [84-74-2] to prep. a premix, which was blended with the same wt. of a butadiene-styrene latex (Nipol 4850A) to obtain a uniform foam.