Stock material or miscellaneous articles – Layer or component removable to expose adhesive – Polymer derived only from ethylenically unsaturated monomer
Patent
1996-10-28
1998-11-17
Short, Patricia A.
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
Polymer derived only from ethylenically unsaturated monomer
428 415, 428 418, 428 419, 428 423, 156277, 156313, 156323, 156327, 156332, B32B 2708
Patent
active
058373411
DESCRIPTION:
BRIEF SUMMARY
INTRODUCTION TO THE INVENTION
This invention relates to a laminated printing sheet.
SUMMARY OF THE INVENTION
According to the present invention there is provided a laminated printing sheet for producing a composite tamper resistant product, the sheet including a sheet of fusible synthetic paper removably adhered by an adhesive to one side of a polymeric sheet with a backing sheet adhered to the opposite side of the polymeric sheet by an adhesive, the sheet of synthetic paper and the backing sheet being discrete sheets and being made of different materials, the synthetic paper and the partially activated adhesive in use being peeled away from the polymeric sheet so that partially activated adhesive can be adhered to a further surface, and so that the outer surface of the fusible synthetic paper be fused to a transparent panel to prevent tampering with information applied to the outer surface of the synthetic paper and covered by the fused transparent panel.
The adhesive interposed between the synthetic paper and the polymeric sheet may be a liquid-based adhesive. The liquid-based adhesive may be a water-based adhesive. The water-based adhesive may be an acrylic adhesive. The acrylic adhesive may be an ethyl butyl acrylic adhesive which is preferable grafted.
The adhesive interposed between the synthetic paper and the polymeric sheet may however be a hot melt adhesive and preferably a low melting point hot melt adhesive The adhesive interposed between the sheet of synthetic paper and the polymeric sheet is preferably partially activated.
The polymeric sheer may be biaxially orientated Preferably the surface of the polymeric sheet facing the backing sheet is modified. The surface of the polymeric sheer may be modified by corona discharge treatment. The polymeric sheet may be a sheet of polypropylene.
The adhesive interposed between the polymeric sheet and the backing sheet may be a liquid-based adhesive. The liquid-based adhesive may be a water-based adhesive. The water-based adhesive may be an acrylic adhesive. The acrylic adhesive may be a polyvinyl acetate acrylic adhesive.
The backing sheet is preferably a sheet of non-stretchable material and it may be a sheet of paper.
According to another aspect of the invention a method of producing the laminated printing sheet as described in the consistory clauses includes the step of heating the adhesive interposed between the synthetic paper and the polymeric sheet partially to activate the adhesive and to cause the polymeric sheet to adhere to the adhesive.
The method may include the prior step of forming, a sandwich consisting of the synthetic paper, adhesive, polymeric sheet, adhesive and backing sheet, and then heating the sandwich to heat the adhesive interposed between the synthetic paper and the polymeric sheet.
BRIEF DESCRIPTION OF THE DIAGRAMS
The invention will now be described, by way of example only, with reference to the accompanying diagrams wherein:
FIG. 1 is an exploded perspective view from one end of a laminated printing sheet according to the invention; and
FIG. 2 is a plan view of the laminated printing sheet.
DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
A laminated printing sheer according to the invention is designated by the reference numeral 10 in the diagrams. The laminated printing sheet 10 comprises a 250 micron thick sheet of synthetic paper 12 removably secured by a layer 14 of a heat activatable grafted ethyl butyl acrylic adhesive to one side 16.1 of a 20 micron thick, biaxially orientated polypropylene sheet 16. A sheet of baking paper 18 is secured by a layer of a water-based polyvinyl acetate acrylic adhesive 20 to the opposite side 16.2 of the polypropylene sheet 16. The backing paper 18 is 60 gram bond paper. The paper may however be between 40 and 120 gram bond paper.
The synthetic paper consists of a polymeric material which has a coating provided on it, which coating can receive print It is believed that the polymeric material component of the synthetic paper comprises at least high density polyethylene. I
REFERENCES:
patent: 3995087 (1976-11-01), Desanzo
patent: 4273816 (1981-06-01), Tollette
Johnstone Sharon Jane
Short Patricia A.
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