| 摘要 |
<p>PURPOSE:To enable the surface treatment of a molded plastic article having projections, such as a bumper, while satisfying all the requirements for low toxicity, safety, coatability, adhesiveness printability, and platability. CONSTITUTION:A molded plastic article is washed with a cleaning agent comprising a hydrocarbon fraction and treated in an atmosphere contg. 0.1-3vol.% ozone. The hydrocarbon fraction comprises mainly a component which is substantially free from naphthalene or biphenyl, has a b.p. of 150-240 deg.C, and is prepd. by the fine fractional distillation of a residual oil which is obtd. by hydrogenating arom. rings of a kerosene fraction consisting mainly of a component having a b.p. of 150-300 deg.C in the presence of a metal catalyst for hydrogenating an arom. ring at 100-300 deg.C under 10-100kg/cm<2> and removing at least a part of n-paraffins from the kerosene fraction using a molecular sieve comprising a synthetic zeolite.</p> |
