Reference

Aromatic hydrocarbon resins

Aromatic hydrocarbon resins. Maeda, Masayoshi (Mitsubishi Gas Chemical Co., Inc., Japan). Japan. Kokai JP 53072093 27 Jun 1978 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G010-02. APPLICATION: JP 76-147454 8 Dec 1976. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Arom. hydrocarbon (1 mol) was condensed with 35 mol HCHO for 30.5 h in the presence of an acid catalyst and treated slowly with arom. hydrocarbon to final HCHO/arom. hydrocarbon molar ratio >2 to give reactive resin free from methylene bridges. For example, formalin 487, 98% H2SO4 131, and m-xylene 106 g were heated at 90° for 0.5 h, treated with 106 g m-xylene over 5 h, and heated at the same temp. for 2 h to give a resin [26139-75-3] (methylene group content 0.03 mol based on xylene ring, 13.8% O, no.-av.-mol.-wt. 580) free from dixylylmethane.

Thermal stability of m-xylene-formaldehyde resin and its derivative

Thermal stability of m-xylene-formaldehyde resin and its derivative. Patel, Rajni; Patel, Kanti; Patel, Raman (Dep. Chem., Sardar Patel Univ., Vidyanagar 388 120, India). J. Indian Chem. Soc., 61(2), 166-8 (English) 1984. CODEN: JICSAH. ISSN: 0019-4522. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) Thermogravimetric data for formaldehyde-m-xylene copolymer (I) [26139-75-3] and its nitrated and chlorinated analogs showed their relative thermal stabilities to be I > nitrated I > chlorinated I. Differential thermal anal. data showed the order of degrdn. of all samples to be different at different heating rates and all exothermic. The activation energy of degrdn. increased as the heating rate decreased.