摘要:
Novel fluoran compounds represented by the formula ( I ):
wherein R¹ is an alkyl group having from 1 to 4 carbon atoms, preparation process of the fluoran compounds, and a heat-sensitive and a pressure-sensitive recording material comprising the fluoran compound, are disclosed.
摘要:
Disclosed are a novel fluoran compound represented by the formula (I): and a heat-sensitive recording paper which is obtained by using the fluoran compound as a chromogenic compound and is excellent in preserving stability.
摘要:
A temperature history indicator includes a region 6 with a hydrophobic organic compound enclosed in microcapsules. If the temperature rises higher than a certain value, the compound melts and diffuses, causing a dye-precursor and a color developer to contact each other to irreversibly achieve color development. This color development system 7 is rendered operative when the high temperature rise continues for a predetermined time period. The top of the color development system is coated with a transparent material 11 with a bonding agent 8 arranged so as neither to break those chemical compositions which cause the color development nor to lower their color developing function.
摘要:
Disclosed is a pressure sensitive recording unit which comprises a single base web sheet and a methine-type dyestuff and an organic oxidizing compound both supported on the single base web sheet, or a combination of first and second base web sheets and the methine-type dyestuff and organic oxidizing compound supported individually on the first and second base web sheets. Such a recording unit includes for example a pressure sensitive recording unit formed in combination of (a) a back-coated topsheet (CB-sheet) making use of microscopic capsules containing a solution obtained by dissolving a methine-type dyestuff in a solvent having a high boiling point and (b) a front-coated undersheet (CF-sheet) carrying an organic oxidizing compound coated thereon. Also disclosed is a pressure sensitive recording unit which includes a base web sheet carrying thereon such a methme-type dyestuff together with a metal ion sequestering agent and/or alkanol amine.
摘要:
Disclosed are a novel fluoran compound represented by the formula (I): and a heat-sensitive recording paper which is obtained by using the fluoran compound as a chromogenic compound and is excellent in preserving stability.
摘要:
The water-base coating formulation comprises as essential components (a) microcapsules which have a synthetic resin as a wall-forming material and (b) a reaction product obtained by polymerizing at least one water-soluble vinyl monomer (B) in the presence of a high polymer latex (A) having a glass transition point of 60°C or lower. The latex (A) and vinyl monomer (B) are used at a solid weight ratio of 3:97 - 90:10. The coating formulation can provide a microcapsule-coated layer having significantly-improved pressure resistance and frictional stability without need for a stilt, and can be applied successfully at a high speed. The coating formulation can form the basis of carbonless copying and/or recording paper for instance of self-contained character incorporating both a dye precursor and a color developer.