公开(公告)号：US4109048A

公开(公告)日：1978-08-22

申请号：US760274

申请日：1977-01-18

申请人： Guido Dessauer ,  Kurt Ramlow ,  Kurt Riecke ,  Franz Wirnitzer

发明人： Guido Dessauer ,  Kurt Ramlow ,  Kurt Riecke ,  Franz Wirnitzer

IPC分类号： B41M5/155 ,  B32B5/16 ,  B41M5/16

CPC分类号： B41M5/1555 ,  Y10S428/914 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/26

摘要： A mixture of .gamma.-alumina and its precursors containing 1 to 30% water volatile at 1000.degree. C converts normally colorless dye materials such as crystal violet lactone, malachite green lactone, benzoyl leuco methylene blue and N-phenylleukauramine to the corresponding colored dyes upon contact, and improves the results achieved with recording material consisting essentially of a fibrous web and a pigment composition secured to the fibers of the web if the mixture amounts to at least 10% of the weight of the pigment composition. Particularly strong and stable colors are produced if the fibrous web is coated with a pigment composition prepared from an aqueous dispersion of the mixture and other pigments on which a basic compound is deposited from a water-soluble zinc salt by means of hydroxyl ions.

公开(公告)号：US4131710A

公开(公告)日：1978-12-26

申请号：US760275

申请日：1977-01-18

申请人： Guido Dessauer ,  Kurt Ramlow ,  Kurt Riecke ,  Franz Wirnitzer

发明人： Guido Dessauer ,  Kurt Ramlow ,  Kurt Riecke ,  Franz Wirnitzer

IPC分类号： B41M5/145 ,  B41M5/155 ,  B32B5/16 ,  B32B9/06 ,  B41M5/16

CPC分类号： B41M5/1555 ,  Y10S428/914 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/259 ,  Y10T428/26

摘要： A recording sheet consisting mainly of fibrous material is capable of displaying a colored image when contacted under pressure with substantially colorless crystal violet lactone and similar dye precursors if at least 3% of the fibrous material is constituted by uniformly distributed asbestos fibers. Sheets having adequate strength for carbonless copying should not contain more than 30% asbestos fibers. Stronger colors are obtained if the sheet further contains a mixture of .gamma.-alumina and .gamma.-alumina precursors in an amount of 2% to 20% of the weight of the fibrous material, the mixture containing 1% to 30% water volatile at 1000.degree. C, and being converted substantially entirely to .gamma.-alumina when heated from 300.degree. to 1000.degree. C.

摘要翻译： 主要由纤维材料组成的记录片材在压力下与基本无色的结晶紫内酯和类似的染料前体接触时能够显示着色图像，如果至少3％的纤维材料由均匀分布的石棉纤维构成。 具有足够强度以进行无碳复制的板材不应含有30％以上的石棉纤维。 如果该片材还含有γ-纤维材料重量的2％至20％的γ-氧化铝和γ-氧化铝前体的混合物，则该颜料的颜色较强，该混合物含有1％至30％的挥发性为1000％的水 并且当从300℃加热至1000℃时，其基本上完全转化为γ-氧化铝。