Detail of "120-52-5"

Reference

Improvement of sea water resistance of chloroprene rubber

Improvement of sea water resistance of chloroprene rubber. Ariyoshi, Takashi; Shimomura, Seiichi; Furuta, Kazumi; Emura, Noriaki (Japan). Toyo Soda Kenkyu Hokoku, 21(1), 13-18 (Japanese) 1977. CODEN: TSKEAP. DOCUMENT TYPE: Journal CA Section: 38 (Elastomers, Including Natural Rubber) Neoprene rubber vulcanized in the presence of p-quinone bis(O-benzoyloxime) (I) [120-52-5] has superior seawater resistance to that of neoprene rubber vulcanized with dicumyl peroxide, hexamethylenediamine carbamate, Epikote 828, or phenolic resins. For instance, a compn. of Skyprene B-30 (neoprene rubber) 100, phenyl-.beta.-naphthylamine 2, Pb3O4 6, and I 6 parts was vulcanized 20 min at 150.degree. to give test pieces having JIS hardness 42, tensile strength 80 kg/cm2, elongation 520%, 300% modulus 22 kg/cm2, and seawater swelling after 800 h at 50.degree. <2 wt.%, compared with 42, 169, 850, 15, and .apprx.10, resp., for a similar vulcanizate contg. MgO 4, ZnO 5, and ethylenethiourea 0.35 part in place of I.

Quinoid curing of butyl and natural rubbers

Quinoid curing of butyl and natural rubbers. Gan, L. M.; Chew, C. H. (Dep. Chem., Natl. Univ. Singapore, Singapore 0511, Singapore). Rubber Chem. Technol., 56(5), 883-91 (English) 1983. CODEN: RCTEA4. ISSN: 0035-9475. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) The vulcanization of butyl rubber (Polysar Butyl 301, IIR) and natural rubber (NR) by p-dinitrosobenzene [105-12-4], p-benzoquinone dioxime (I) [105-11-3], I dibenzoate (II) [120-52-5] and chloranil [118-75-2] oxidized by various oxidants was studied. Curing efficiency was good for IIR contg. I or II and Pb3O4. Of the quinone, ~85% was in the form of crosslinks, the remainder probably formed pendant groups. NR could be cured slowly by I or II alone. ZnO or PbO were effective in activating II to give NR vulcanizates with good scorch resistance. Crosslink d. was highest for 1:1 II-Pb3O4. 105-12-4 and 1317-36-8 are just another two chemicals used in this study. Crosslinking efficiency was generally low for quinones with NR. Vulcanization mechanisms are discussed. .