Reference

Dual component coating system

Dual component coating system. Frye, Robert B. (General Electric Co., USA). U.S. US 4477519 A 16 Oct 1984, 5 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: B32B005-16; B32B027-36; B05D007-00. NCL: 428331000. APPLICATION: US 81-327448 4 Dec 1981. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) Section cross-reference(s): 38 Abrasion-, light-, and moisture-resistant transparent coatings or transparent plastics comprised a PMMA [9011-14-7] primer layer contg. light stabilizers and a top layer contg. colloidal silica, an organosilane, and a light stabilizer different from that in the primer. Thus, adding 834 g Ludox LS (aq. colloidal silica) in 30 min to a soln. of 2.8 g HOAc in 1017 g MeSi(OMe)3 at 20-30°, maintaining the temp. at 20-30° for 16 h, dilg. to 20% solids with 1900 g iso-BuOH, and adding 30 g SF-1066 (polysiloxane polyether) flow-control agent, and 30 g Uvinul 400 (2,4-dihydroxybenzophenone) [131-56-6] gave a top coating compn. This compn. was applied to Lexan [24936-68-3] plaques primed with a mixt. contg. 100 g 4% PMMA in Cellosolve-diacetone alc. and 1 g Cyasorb UV 5411 (2-hydroxy-5-octylphenylbenzotriazole) [3147-75-9], air-dried 30 min, and cured 1 h at 120° to give a coating which passed an appearance test, exhibited 1.5% haziness increase in the Taber Abrasion test, passed initial cross hatch adhesion test, and failed the cross hatch adhesion test after <714 h in the OUV Accelerated Weathering Tester (8 h UV cycle at 60°, 4 h condensation cycle at 50°).

Light stabilizers for UV-curable resins

Light stabilizers for UV-curable resins. Schroeter, Siegfried Herman; Olson, Daniel Robert (General Electric Co., USA). Ger. Offen. DE 2648367 5 May 1977, 16 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C07D249-06. PRIORITY: US 75-626490 28 Oct 1975. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Section cross-reference(s): 25, 28 4-(Dodecyloxy)-2-hydroxybenzophenone (I) [2985-59-3] and 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole [3147-75-9] were treated with EtNCO [109-90-0] or PhNCO [103-71-9] to prep. II [63148-17-4] and III (R = Et or Ph), resp. II and III were added to photohardenable resins. II and III did not hinder the photohardening, and the hardened resin was heated at 130.degree. to decomp. II and III and regenerate the hydroxybenzene derivs. which were effective as light stabilizers. Thus, I 7.64, EtNCO 2.7, triethylenediamine 0.05, and CH2Cl2 10 parts were mixed at 25.degree. for 100 h to prep. 4.4 parts II. A photohardenable poly(methyl methacrylate) [9011-14-7]-methyl methacrylate compn. contg. 3% II was hardened in UV light and heated at 130.degree. for 3 h to decomp. II and regenerate I as a light stabilizer.