Detail of "29797-40-8"

Reference

Tetrachlorodiarylmethanes useful as dielectrics, and dichlorotoluene as an intermediate for their production

Tetrachlorodiarylmethanes useful as dielectrics, and dichlorotoluene as an intermediate for their production. Pontoglio, Achille; Nebel, Sergio; Niederjaufner, Guido (Caffaro S.p.A. Societa per l'Industria Chimica ed Elettrochimica, Italy). Fr. Demande FR 2543133 A1 28 Sep 1984, 11 pp. (French). (France). CODEN: FRXXBL. CLASS: IC: C07C025-18; C07C017-14; C07C025-02; H01B003-00. APPLICATION: FR 84-4379 21 Mar 1984. PRIORITY: IT 83-20187 21 Mar 1983. DOCUMENT TYPE: Patent CA Section: 45 (Industrial Organic Chemicals, Leather, Fats, and Waxes) Section cross-reference(s): 25 Toluene [108-88-3] and/or o-chlorotoluene [95-49-8] is chlorinated with Cl in the presence of a zeolite catalyst to give dichlorotoluene (I) [29797-40-8], I is photochem. chlorinated to give dichlorobenzyl chloride (II) [38721-71-0], and II is subjected to a Friedel-Crafts reaction with I in the presence of a zeolite catalyst to give tetrachlorodiarylmethanes having good dielec. properties (esp. dipole moments). The zeolite is a decationized faujasite X or Y which gives good selectivity to dichlorides in the 1st step of the prepn. No special treatment is necessary to remove or destroy the zeolite catalysts.

Molecular weight determination of aromatic polyether ketones by GPC

Molecular weight determination of aromatic polyether ketones by GPC. Kuroki, Takashi; Toriida, Masahiro; Hasegawa, Akira; Abe, Takaharu; Iwata, Kenji; Tamai, Masashi (Mitsui Chemicals Inc., Japan). Jpn. Kokai Tokkyo Koho JP 2004045166 A2 12 Feb 2004, 11 pp. (Japanese). (Japan). CODEN: JKXXAF.There are some reagents with their cas registry numbers 29797-40-8 and 29732-82-9 are used in this study. CLASS: ICM: G01N030-88. ICS: G01N030-26; G01N030-54. APPLICATION: JP 2002-202076 11 Jul 2002. DOCUMENT TYPE: Patent CA Section: 36 (Physical Properties of Synthetic High Polymers) Using GPC, the mol. wt. of arom. polyether ketones, is detd. with high reproducibility using an eluate composed of chlorophenol and halogenated benzene solvent mixt. at a ratio of - , and the halogenated benzene can be selected from chlorobenzene, chlorotoluene, bromobenzene, bromotoluene, dichlorobenzene, dichlorotoluene, dibromobenzene, and dibromotoluene. Thus, using a mixt. solvent composed of chlorophenol and orthodichlorobenzene at a ratio of as eluent, the mol. wt. of polyether-polyketone (PEEK 450P) was measured. .