| 摘要 |
<p>Carbonless pressure sensitive copying sheet and a method of making the same, the sheet containing sufficient amounts of groundwood to normally cause yellowing when contacted with a color forming coating containing a color forming agent encapsulated in a polyamide resin. The yellowing characteristics are inhibited by providing a barrier layer which is coated directly on the base sheet, the barrier layer containing clay and other usual paper coating ingredients, together with an amount of an alkali metal sulfite sufficient to inhibit the yellowing tendencies. The color forming layer including the color forming agent encapsulated in the polyamide resin is applied over the barrier layer.</p> |
