Reference

Silane scavengers for hydroxy radicals containing silicon-hydrogen bonds

Silane scavengers for hydroxy radicals containing silicon-hydrogen bonds. Chung, Rack H. (General Electric Co., USA). U.S. US 4489191 A 18 Dec 1984, 6 pp.Several reagents such as 3277-26-7 is used here. (English). (United States of America). CODEN: USXXAM. CLASS: ICM: C08K003-08. NCL: 524779000. APPLICATION: US 83-528274 31 Aug 1983. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) A stable, one-package, silicone room-temp.-vulcanizable (RTV) compn. convertible to a tack-free elastomer comprises (A) alkoxy-terminated siloxane; (B) an effective amt. of condensation catalyst; (C) a stabilizing amt. of scavenger for OH-functional groups, wherein the scavenger contains 31 Si-H bond; (D) an effective amt. of crosslinking silane; and optionally (E) an effective amt. of a cocatalyst or curing accelerator. Thus, a dimethoxy end-capped siloxane was mixed with tetramethyldisiloxane [3277-26-7], dibutyltin diacetate [1067-33-0], and aminoethylaminopropyltrimethoxysilane [1760-24-3] for 15 min, and then aged at 100° in Al tubes. The tack-free time for the compn. was 40 min. .

Copolymers for producing oxygen-permeable soft contact lenses

Copolymers for producing oxygen-permeable soft contact lenses. Shibata, Takanori; Yoshikawa, Toshiharu; Isobe, Kenichi; Ichinohe, Shoji (Toyo Contact Lens Co., Ltd.; Shin-Etsu Chemical Industry Co., Ltd. , Japan). Ger. Offen. DE 3409858 A1 11 Oct 1984, 45 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08G077-42; G02B001-04. APPLICATION: DE 84-3409858 17 Mar 1984. PRIORITY: JP 83-60305 6 Apr 1983. DOCUMENT TYPE: Patent CA Section: 63 (Pharmaceuticals) Section cross-reference(s): 35, 38 Copolymers for soft contact lenses for extended wear contain a hydrophilic monomer, a hydrophobic monomer, and a hydrophilic siloxanyl alkyl ester R1C(:CH2)CO2(CH2)n(R22SiO)mR22Si(CH2)k(R22SiO)lSiR22R3, where R1 is H or Me, R2 is Me or OSiMe3, R3 is oligoether, diol, aminohydrin, or amido group, n is 1-4, m and l are 0-2, and k is 2-4. Thus, triethylene glycol allyl methyl ether [19685-21-3] was condensed with 1,1,3,3-tetramethyldisiloxane [3277-26-7] in the presence of chloroplatinic acid, and 1-methoxyethoxyethoxyethoxypropyl-1,1,3,3-tetramethyldisiloxane [94356-51-1] was distd. 3-Chloropropylchlorodimethylsilane [10605-40-0] was added to H2O at room temp., and the soln. was neutralized with Na2CO3 and extd. with hexane to give 1,3-bis(3-chloropropyl)-1,1,3,3-tetramethyldisiloxane [18132-72-4], which was reacted with methacrylic acid [79-41-4] in the presence of Et3N, DMF, and hydroquinone and then treated with Na2CO3 to give 1,3-bis(methacryloyloxypropyl)-1,1,3,3-tetramethyldisiloxane [18547-93-8]. This compd. was treated at room temp. in the presence of H2SO4 with 1,3-divinyl-1,1,3,3-tetramethyldisiloxane [2627-95-4] to give 1-methacryloyloxypropyl-3-vinyl-1,1,3,3-tetramethyldisiloxane [94356-52-2], which was treated with 1-methoxyethoxyethoxyethoxypropyl-1,1,3,3-tetramethyldisiloxane in the presence of hydroquinone, cyclohexane, and chloroplatinic acid to form 1-(g-methacryloyloxypropyl-a,a,g,g-tetramethyldisiloxy)-2-(g'-methoxy ethoxyethoxyethoxypropyl-a',a',g',g'-tetramethyldisiloxy)ethane [94290-77-4]. A polymer [94290-94-5] for soft contact lenses was prepd. from the silane 50, Bu methacrylate (hydrophobic monomer) 20, N-vinylpyrrolidone 5 and 2-hydroxyethyl methacrylate (hydrophilic monomers) 25, and allyl methacrylate 0.5 parts with 2,2'-azobis(2,4-dimethylvaleronitrile) catalyst. The lenses contained 10.8% H2O, an O permeability of 4.6 ′ 10-10 cm3. 19685-21-3 which is the cas registry number of one of substances is just one of reagents here.cm/cm2.s.mm, a contact angle of 19.0°, and a needle penetration strength of 504 g/mm0.5. .