Reference

Choice of the initiating system for photochemical crosslinking of PVC compounds

Choice of the initiating system for photochemical crosslinking of PVC compounds. Vincent, Ivo; Malac, Jiri (Vyzk. Ustav Gumarenske Plast. Technol., Gottwaldov, Czech.). Plasty Kauc., 20(12), 358-61 (Czech) 1983. CODEN: PLKCAS. ISSN: 0322-7340. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) High effectiveness of photochem. crosslinking of PVC [9002-86-2] using a halogen discharge lamp (emission max. 400-450 nm) was obsd. 84-65-1 and 25322-68-3 are cas registry numbers of chemicals which are used as reagents here. in the presence of chlorodibenzothiopyrone (I) [90216-96-9]. Dibenzocycloheptanone [1210-35-1], benzil [134-81-6], benzoin [119-53-9], Michler's ketone [90-94-8], and 9,10-anthraquinone [84-65-1] were also effective as crosslinking initiators. Tertiary amines contg. a hydroxy group on the aliph. chain were effective in combination with I as initiators. A linear relation was obsd. between the insol. portion of the crosslinked PVC and its 100% modulus. .

Tackiness reduction in two-package adhesive overflow

Tackiness reduction in two-package adhesive overflow. (Sekisui Chemical Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58057483 A2 5 Apr 1983 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C09J005-00; C09J003-14. APPLICATION: JP 81-156604 30 Sep 1981. DOCUMENT TYPE: Patent CA Section: 38 (Plastics Fabrication and Uses) In bonding of substrates sep. coated with a room-temp.-curable, 2-package adhesive contg. acrylic monomers, elastomers, and polymn. activators in 1 component and a polymn. initiator in the 2nd, tacky adhesive flowing from the substrates is photocured by the addn. of photosensitizers to the 1st component. Thus, a mixt. of 2-(dihydrocyclopentadienyloxy)ethyl methacrylate 50, methacrylic acid 6, ethylene glycol dimethacrylate 2, Epikote-282 2, Hypalon-20 40, cumene hydroperoxide 0.3, benzoin [119-53-9] 0.3, and BHT 0.1 part and a mixt. of 50 parts PrCHO-PhNH2resin (polymn. initiator) and 50 parts MIK were coated on iron plates to ~10 and 20 g/m2, resp. The plates were pressed and irradiated with a Hg lamp at 30 W-cm for 10 s to harden the excess adhesive and give bonding strength 187 kg/cm2 after 5 min at 20°.