Reference

Polymer materials with high water absorbability

Polymer materials with high water absorbability. Fujimoto, Masanori; Tsuji, Kozo; Magase, Tsuneyuki (Sumitomo Chemical Co., Ltd., Japan). Japan. Kokai JP 52014689 3 Feb 1977 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08F008-00. APPLICATION: JP 75-90849 24 Jul 1975. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) The polymers were prepd. by crosslinking sapond. Me acrylate-vinyl acetate copolymer (I) [25067-63-4] with ethylene glycol diglycidyl ether (II) [2224-15-9] or 1,6-hexanediol diglycidyl ether [16096-31-4]. Thus, 10 g (molar) I was dispersed in 500 mL MeOH, mixed with 20 mL 40% aq. NaOH, sapond. at 60.degree. 2224-15-9 and 25067-63-4 are also in the experiment. for 20 h to degree of sapon. 90 mol%, dissolved (10 g salt) in 500 mL water, mixed with 0.1 g II and 0.1 g NaOH, heated at 50.degree. for 3 h, and solidified in EtOH to prep. a polymer capable of absorbing 250 times its wt. of water. .

Protective coatings for plastic lenses

Protective coatings for plastic lenses. (Suwa Seikosha Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58126501 A2 28 Jul 1983 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: G02B001-10. ICA: C08J007-04; C09D003-82. APPLICATION: JP 82-8678 22 Jan 1982.In this article, certain chemicals are used. Some of their cas registry numbers are 6074-84-6 and 25656-90-0 DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) Section cross-reference(s): 38 Compns. forming protective coatings on plastic lenses, with excellent scratch and water resistance and dyeability contain RnSi(OR1)4-n (R = H, Me, Et, Ph, epoxy group-contg. org. group; R1 = C1-4 alkyl, n = 0.2), Ta(OR)5 (R = C1-4 alkyl) or its condensate, and an org. compd. having 1-3 epoxy groups. Thus, a mixt. of Si(OMe)4 5, 3-glycidyloxypropyltrimethoxysilane 60, and 1,6-bis(glycidyloxy)hexane [16096-31-4] 35 parts was slowly treated with 0.1 part Ta(OEt)5 [6074-84-6], stirred vigorously, aged for >20 h, treated with a small amt. of a silicone surfactant, dip-coated on a CR 39 [25656-90-0] lens to dry thickness 5 m, and dried at 80° for 0.5 h and then at 130° for 1.5 h to give a coated lens. .