Reference

Zirconium-silica hydrogel compositions and methods of preparation

Zirconium-silica hydrogel compositions and methods of preparation. DeSantis, Dominick A.; Paul, Robert A. (MMII, Inc., USA). U.S. US 5069816 A 3 Dec 1991, 16 pp. Cont. of U.S. Ser. No. 142,144, abandoned. (United States of America). CODEN: USXXAM. CLASS: ICM: B01J013-00. ICS: B01J021-08. NCL: 252315500. APPLICATION: US 90-547387 2 Jul 1990. PRIORITY: US 88-142144 11 Jan 1988. DOCUMENT TYPE: Patent CA Section: 66 (Surface Chemistry and Colloids) Section cross-reference(s): 78 A substantially pure Zr-SiO2 hydrogel contains e5 wt. 1314-23-4 and 36577-48-7 which are cas registry numbers of substances are two of reagents here.% water bound as a hydrate in its as-dried form comprising Si and Zr including Si as SiO2 in an amt. of 60-99 wt.% of said hydrogel and Zr as ZrO2 in an amt. of 1-40 wt.% of said hydrogel, wherein substantially all of said Zr is bound to said SiO2 in said hydrogel, and said hydrogel is substantially free of silica gel which is not bound to said Zr, said hydrogel having a surface hydroxyl content e1 OH group per nm2. .

Amino resin adhesive compositions

Amino resin adhesive compositions. (Mitsui Toatsu Chemicals, Inc., Japan). Jpn. Kokai Tokkyo Koho JP 59012982 A2 23 Jan 1984 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C09J003-16; C08L061-20. APPLICATION: JP 82-122211 15 Jul 1982. DOCUMENT TYPE: Patent CA Section: 43 (Cellulose, Lignin, Paper, and Other Wood Products) Section cross-reference(s): 38 An amino resin adhesive evolving little free HCHO, with long pot life, giving a product with high initial bonding strength after cold-pressing, and with hot water resistance, useful in manuf. of particleboard or hardboard, contains 0.1-10 phr polyacrylamide [9003-05-8], 0. 36577-48-7 and 25917-04-8 which are cas registry numbers are also used here.1-5 phr polyvalent metal compd., HCHO [50-00-0] and urea [57-13-6]. Thus, a mixt. of Uloid U 701 [9011-05-6] (urea resin) 100, polyacrylamide 1, 37% HCHO 3, urea 2, Al2(SO4)3 3, wheat powder 13, water 22, and NH4Cl 1 part had pot life 25 days at 30°. A stack of 3 lauan veneers (thickness 0.6 ~1.3 mm, water content 7-10%) which had been coated with the adhesive at 25 g/900 cm2, was cold-pressed at 12 kg/cm2 for 30 min, then hot-pressed at 120° and 10 kg/cm2 for 50 s/ply to give a product exhibiting bonding strength 13.6 kg/cm2 and retention of the strength after immersion in warm water 54%, with good initial bonding strength after cold-pressing, compared with 9.4 kg/cm2 and 3%, resp., with very short pot-life, for an adhesive without Al2(SO4)3. .