Heat-sensitive and photofixing recording sheet with diazosulfonate and acidic coupling agent therefore

A heat-sensitive recording sheet adapted for use in a recording process consisting in sequence of optical activation with a wavelength of more than 400 nm, heat-sensitive recording with a thermal energy of 0.4-10 w/1-3 msec per dot (260.mu..times.130.mu.) and photofixing at a wavelength of 300-450 nm, wherein on at least one major surface of a sheet-like support body is formed a heat-sensitive recording layer consisting of:

• a diazosulfonate;
• an acidic coupling agent comprising an aromatic compound in which one or more --OH groups and one --COOH group are bonded to an aromatic ring;
• and
• a member selected from the group consisting of thermosetting or thermoplastic resins having a glass transition point of 70.degree.-150.degree. C.