| 摘要 |
1,242,189. Colour-reactive copying sheets. LAMSON PARAGON Ltd. 25 July, 1969 [2 Aug., 1968], No. 37553/69. Heading D2B. [Also in Division B8] A colour-transfer paper is made by coating paper with an emulsion comprising dual-walled microcapsules (see Div. B8) containing 3-octyl spirodi-(naphthopyran) in "Bronoco" solvent to give a product affording a dense blue write off when pressure is applied whilst it is in contact with an acid-activated, clay-coated sheet. |
