Dry transfer sheets

US4041204A · kind A · utility

Assignee

• The Autotype Company Limited

Inventors

• Martin Hepher
• John A. Sperry · Norton, GB
• Malcolm J. Stewart

Key dates

• Filing date: Jan 18, 1974
• Grant date: Aug 9, 1977
• Expiry date: Jan 18, 1994

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2486
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A photosensitive sheet product which enables dry transfer sheets to be made very simply by a process involving photographic exposure, water-washing to remove unexposed parts of the photosensitive material and drying. The photo-sensitive material itself contains the resin or other adhesive present in the letters or other transferable images and the problem of the adhesiveness which would be apparent in the transferred characters or pictorial matter in the product is solved by making the dry transfer sheet with a temporary keycoat which transfers with the characters or pictorial matter and remains as a protective layer on the finished product. Another advantageous feature of the dry transfer sheets described is that they can be formulated so as to be pressure-transferable in the normal way or alternatively can be heated or solvent-treated to exhibit a permanently increased adhesiveness, making broad-area transfer possible using much lower transfer pressures than required in normal use.