| 摘要 |
Method of offset printing on a polypropylene resin case for a video tape cassette comprises (a) applying an anchor coat to the surface to be printed on a polypropylene sheet to be folded into the case and (b) offset printing onto the anchor coat using a UV curing offset printing ink. (i) Pref. the anchor coat comprises a polyol, a polyester and a vinyl chloride resin as principal components, together with an isocyanate curing agent; (ii) after application, the anchor coat is subjected to a precuring treatment and offset printing is carried out before the anchor coat becomes fully cured, esp. Where precuring is carried out for 15 mins. at 65 deg. C;(iii).
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