| 摘要 |
A method for obtaining a water based dispersion of solid particles containing UV absorbing components as active ingredients comprises the following steps: a) heating an encapsulating matrix above its melting point; b) dissolving an UV absorbing material in the melted encapsulating matrix; c) heating water to the same temperature as the encapsulating matrix; d) adding a suitable surfactant in a predetermined quantity to the heated water; e) emulsifying the heated solution comprising the UV absorbing material; f) cooling down the emulsified mixture in order to obtain the formation of a uniform mixture of solid particles containing said UV absorbing components. The resulting water based dispersion may either be formulated in a gravure ink, or be added to a gravure ink that does not contain pigment, or be incorporated in a coating. |
