Reference

Reactive hot-melt adhesive compositions

Reactive hot-melt adhesive compositions. (Yokohama Rubber Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59078281 A2 7 May 1984 Showa, 10 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C09J003-14. ICA: C08L023-16; C08L023-22; C08L053-00. APPLICATION: JP 82-187344 27 Oct 1982. DOCUMENT TYPE: Patent CA Section: 38 (Plastics Fabrication and Uses) Section cross-reference(s): 39 The title compns., which cure to form bonds with good heat resistance, comprise a hot-melt adhesive from diene block copolymer and/or isobutylene-isoprene copolymer [9010-85-9] 100, a vulcanization accelerator 0.1-10, and a tackifier 10-400 parts and another hot-melt adhesive from ethylene-propylene copolymer [9010-79-1] and/or atactic polypropylene [9003-07-0] 100, S 0.1-20, and a tackifier 10-400 parts. Thus, TR1107 (block isoprene-styrene rubber) 100, Arkon P100 60, Escorez 5300 60, Nocceler DM [120-78-5] 2, and Nocceler BZ [136-23-2] 2 parts were mixed to prep. one adhesive, and EPT 0045 (ethylene-propylene rubber) 100, Arkon P 100 70, Escorez 5300 70, HV 100 20, and powd. S 5 parts were mixed to prep. another adhesive. The adhesives were then kneaded together and extruded into test pieces, which showed good hardness and heat resistance.

Studies on bonding rubber to metallic zinc

Studies on bonding rubber to metallic zinc. (III). The effect of accelerators on adhesion of NR with cobalt salts to zinc plate. Ashida, Michio; Nakatani, Masaya; Takemoto, Yoshitaka; Goto, Makio (Fac. Eng., Kobe Univ., Kobe 657, Japan). Nippon Gomu Kyokaishi, 57(9), 544-52 (Japanese) 1984. CODEN: NGOKAF. ISSN: 0029-022X. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Vulcanization and adhesion of natural rubber compds. contg. Co naphthenate (I) or cobalt stearate (II) [13586-84-0] to Zn plate were studied in the presence of various vulcanization accelerators. I did not affect the vulcanization acceleration by thiazole- and sulfenamide-type accelerators, while thiuram- and dithiocarbamate-type accelerators reacted with I, losing their acceleration capabilities. However, when S content was increased, a weak acceleration by excess I resulted. Vulcanization by 2-mercaptobenzothiazole (III) [149-30-4] gave the highest adhesion at vulcanization temp. <150°, while at >160° the adhesive strength decreased with increasing vulcanization time. This adhesive strength decrease was more severe with CBS [95-33-0] than with III. The adhesive strength was in the order of MBTS [120-78-5] > III > 2-mercaptothiazole zinc salt [21396-97-4]. Zinc dimethyldithiocarbamate [137-30-4] gave sufficient adhesive strength at high S content, while no adhesion was obsd. in the presence of diphenylguanidine [102-06-7]. At vulcanization temp. 160°, addn. of I or II resulted in decreased polysulfide crosslinks and increased monosulfide crosslinks. The Zn surface with good adhesion contained ZnO, ZnS, and ZnSO4 in :15 ratio, while the surface with poor adhesion contained ZnO and ZnS in ratio (ESCA).