Reference

Oxymethylene copolymer compositions

Oxymethylene copolymer compositions. (Mitsubishi Gas Chemical Co., Inc., Japan). Jpn. Kokai Tokkyo Koho JP 60090250 A2 21 May 1985 Showa, 12 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: ICM: C08L059-00. ICS: C08K013-02. ICI: C08L059-00, C08L061-28; C08K013-02, C08K005-34, C08K005-13, C08K003-18. APPLICATION: JP 83-198484 24 Oct 1983. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) The heat-resistant title compns. contain an amine-substituted triazine deriv. or its condensation product with HCHO, a hindered phenol I [R, R1 = alkyl; Z = O(CH2CH2O)3, O(CH2)2S(CH2)2O], and a hydroxide or a salt of Na, K, Mg, Ca, or Ba. Thus, polyoxymethylene [24969-25-3] from 100 parts trioxane and 2.5 parts ethylene oxide and compounded with melamine [108-78-1] 0.2, triethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] [36443-68-2] 0.5, and Mg(OH)2 0.1 phr gave an injection-molded product exhibiting color changes (DE) 0-4.0 after 500 h in 140° air, impact strength 120 kg-cm/cm2, and no. of shots before formation of mold deposits 35000 cycles during injection molding at 225° and molding cycles of ~20 s, compared with 4.1-8.0, 120 kg-cm/cm2, and 300 cycles, resp., for a compn. not contg. Mg(OH)2.

Heat and light stable polyacetals with excellent color stability

Heat and light stable polyacetals with excellent color stability. Mutterer, Francis (USA). Res. Discl., 254, 301 (English) 1985. CODEN: RSDSBB. ISSN: 0374-4353. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) Polyacetals stabilized with 0.1-1% 3,6-dioxa-1,8-octanediyl bis[3-(4-hydroxy-3-methyl-5-tert-butylphenyl)propionate (I) [36443-68-2] antioxidant exhibited reduced yellowing and improved mech. properties e.g. aging at elevated temps. (80-140°), hot water storage, or light exposure (diffuse daylight, artificial, or outdoor weathering). I also significantly retarded formation of microcracks and chalking in polyacetals. The stabilization effect of I could be increased by using I in combination with 0.1-0.5% UV absorber and/or a hindered amine light stabilizer.