| 摘要 |
<p>Labels for the marking of rubber parts, esp. tyres, comprise (a) a support of a pale co-vulcanised rubber mixt., which can be inscribed by a laser and contains (b) an additive with which a colour change is obtd. with laser irradiation, opt. (c) covered with a protective covering transparent in the visible region and the near IR, opt. (d) an adhesive coating, and opt. (e) covered with a release paper or film. Pref. with the exception of the side which is to be inscribed, the support carries on all sides a barrier layer, pref. of polyamide or polyvinylidene chloride, or of an evaporated layer, pref. of metal, e.g. Al or of SiOK. The rubber is a blend of synthetic rubbers, e.g. SBR, butyl or EPDM rubber, and contains 0.1-10 (0.5-5) wt.% of additives, e.g. anti-ageing agents, cross-linking agents, protectants against light and O3, ZnO, fatty acids, resins, plasticisers and accelerators, or pigments, esp. Cu3(PO4)2xCu(OH)2, or a coated pearl gloss pigment, e.g. 'Iriodin' (RTM). The shape of the labels may be stabilised by cross-linking by UV irradiation, electron hardening, or thermally or chemically, and/or by insertion of a fabric. The label is treated with a self-adhesive vulcanisable rubber adhesive compsn., and has a protective layer of polyester, polyamide, a perfluorinated polymer, a polyolefin or a polyimide.</p> |
