Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1996-08-12
1998-12-22
Woodward, Ana
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
428343, 428349, 428353, 428354, 428355, 428350, B32B 712
Patent
active
058516620
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an adhesive sheet, particularly to an adhesive sheet which can be recycled, and more particularly to an adhesive sheet having an adhesive layer composed of an adhesive which is so highly redispersible in water that the adhesive sheet can be readily defibered during the pulp recycling without being adversely affected by the adhesive.
The present invention also relates to a removable adhesive sheet which is used, for example, as a price label, a label for process control or an index label for a video cassette or the like. More particularly, this invention relates to a removable adhesive sheet which has a removable adhesive layer formed from such a highly water-redispersible removable adhesive that the adhesive sheet can be easily defibered in the pulp recycling without being adversely affected by the adhesive.
BACKGROUND ART
Adhesive sheets as processed into labels, stickers, emblems, delivery slips or the like are widely employed for commercial use, office use, process control, distribution control, household use or other purposes. These adhesive sheets generally has an adhesive layer interposed between a surface stock and a release liner.
For use, the adhesive layer and the surface stock together constitute said labels, stickers, emblems or delivery slips (these will be hereinafter collectively referred to as "label"). The label is attached to an article after removal from a release liner.
Papers, foils, films and like sheets are mainly used as the surface stock.
On the other hand, as the release liner, a release liner support as coated with a release agent such as a silicon compound or a fluorine-containing compound is used. Examples of the release liner support include, for example, high-density base papers such as glassine paper; laminated papers wherein a film of a resin such as polyethylene is laminated on a sheet of clay coated paper, kraft paper, woodfree paper or the like; and resin-coated base papers wherein a coating layer predominantly composed of a pigment and a water-soluble high-molecular-weight substance such as polyvinyl alcohol or starch is formed on a sheet of kraft paper, woodfree paper or the like. Among them, generally used are release liners wherein a polyethylene-laminated support is coated with a release agent.
As the adhesive, various rubber-based, acrylic-based, vinyl ether-based adhesives of the emulsion, solvent or solventless type or the like are used. Such adhesive sheets are classified into the permanent adhesion type which, after application to articles such as commodities, is kept adhering thereto for permanent use, and the removable type to be removed and discarded after attainment of display purpose depending on the kind of commodities and the like.
Among such adhesive sheets, removable adhesive sheets are used, for example, as price labels which are frequently removed and attached depending on the change in prices, or as labels for process control purposes. When eventually peeled off after achieving the display purpose, the labels should be easily removed without leaving any portion of the adhesive on the articles such as commodities. In other words, such labels are fundamentally required to have good removability which assures freedom from impairing the appearance of articles.
On the other hand, as to the recycling of waste papers, the amount of waste papers including brokes for regeneration as the raw materials for producing pulps in our country has already exceeded 50% of the raw materials used for the production of papers and paperboards. Therefore, the waste papers have occupied the position of main raw materials.
Waste papers which can be repulped include newspapers, corrugated fiberboards, magazines, simili paper, printing papers, cards, tickets, pasteboards (mounting board), heat-sensitive recording papers, pressure-sensitive copying papers, papers for OCR, etc.
Generally, waste papers can be recycled by a process comprising a disintegration step for defiberizing waste papers to give a pulp suspension, c
REFERENCES:
patent: 5514435 (1996-05-01), Suzuki et al.
Kunihiro Akira
Ohhashi Hiroyuki
Suzuki Kenji
New Oji Paper Co. Ltd.
Woodward Ana
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