Water-added evaporation process for making thin plastic letterin

Stock material or miscellaneous articles – Two dimensionally sectional layer – Transparent or translucent layer or section

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428 402, 428 415, 428 43, 428195, 428207, 428212, 428346, 428914, 156234, 156247, 156257, 156264, 156267, B32B 900

Patent

active

057027900

ABSTRACT:
A water-evaporation process for making thin one-color plastic lettering, as used in sets for computer-cutting and application in spaced array. Water-based plastics, particularly urethanes and acrylics are used instead of polyvinyl chloride. These more flexible films are opaque, resulting from use of large amounts of water-dispersed pigments. After spreading, the water is evaporated, causing the spread mixture to coalesce into a thin tough well-pigmented opaque film. Films less than two mils thick may be formed, free from migratory plasticizers which might cause pigments to migrate or to damage adjacent the flanking layers of adhesives and release films. The water evaporation process, at only about 220.degree. F., requires minimal workplace or environmental safeguards compared to the use of solvent containing systems.

REFERENCES:
patent: 5095069 (1992-03-01), Ambrose et al.
patent: 5312645 (1994-05-01), Dressler
patent: 5441785 (1995-08-01), Liebe, Jr.

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