Easily peelable laminated film

Abstract

An easily peelable laminated film includes a laminate of a peelable surface layer (B) having a peeling strength of 5 to 100 g / cm with a base layer (A) containing a thermoplastic resin. The laminated film of the invention provides an easily peelable laminated film excellent in water resistance as a base materialfor, for example, concealing seals and labels for preventing re-pasting. The easily peelable laminated film of the invention requires no specific process to start peeling.

Description

[0001] The present invention relates to an easily peelable laminated film comprising a laminate of a base layer (A) comprising a thermoplastic resin, and a peelable surface layer (B) weaker in strength than the base layer (A).[0002] An easily peelable laminated film is useful as a base material of, for example, delivery slips, concealing seals of post cards and passbooks, labels for preventing re-pasting, seals for preventing alteration, application seals, and coupons free of remaining adhesives.[0003] There has been conventionally such a problem in the salesroom of foods in supermarkets and department stores that there are persons who peel off the pressure-sensitive adhesive price label of lowered price from the foods on sale nearing eatable limit and replace this price label with the price label of foods of normal price and purchase the foods at a cheaper price.[0004] Therefore, a label for preventing re-pasting which is easily known to be the peeled label after peeling and re-pas...

AI Technical Summary

Benefits of technology

[0056] The opaqueness of easily peelable laminated film (i) in the present invention is preferably from 60 to 100%, more preferably from 70 to 100%, and still more preferably from 85 to 100%. When the opaqueness is less than 60%, the informations to be protected are seen through a label when easily peelable laminated film (i) is used as a concealing seal, and the desired effect of the invention cannot be exhibited.

[0058] A pressure-sensitive adhesive layer can be provided on the side of the peelable surface layer (B) opposite to the base layer (A) of the easily peelable laminated film (i) of the invention (i.e., next to the peelable surface layer or next to the protective layer, if provided), if desired.

[0059] By providing a pressure-sensitive adhesive layer on an easily peelable laminated film, an easily peelable laminated label (ii) can be obtained.

[0060] As such pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, acryl-based pressure-sensitive adhesives and silicon-based pressure-sensitive adhesives are representative. Specific examples of rubber-based pressure-sensitive adhesives include polyisobutylene rubber, butyl rubber and mixtures thereof, and pressure-sensitive adhesives obtained by blending these rubber-based pressure-sensitive adhesives with a tackifier, e.g., abietic acid rosin ester, a terpene-phenol copolymer, or a terpene-indene copolymer. Specific examples of acryl-based pressure-sensitive adhesives include those having a glass transition temperature of -20.degree. C. or less, e.g., a 2 thylhexyl acrylate-n-butyl acrylate copolymer and a 2-ethylhexyl acrylate-ethyl acrylate-methyl methacrylate copolymer.

[0061] As the types of these pressure-sensitive adhesives, a solvent-type, an emulsion-type and a hot melt-type are used. In general, a pressure-sensitive adhesive layer is laminated by coating a solvent-type or emulsion-type adhesive.

[0062] Coating is performed by means of a roll coater, a blade coater, a bar coater, an air knife coater, a gravure coater, a reverse coater, a die coater, a lip coater, a spray coater, or a comma coater and, if necessary, smoothing is performed, and a pressure-sensitive adhesive layer is formed through drying.

Problems solved by technology

There has been conventionally such a problem in the salesroom of foods in supermarkets and department stores that there are persons who peel off the pressure-sensitive adhesive price label of lowered price from the foods on sale nearing eatable limit and replace this price label with the price label of foods of normal price and purchase the foods at a cheaper price.

However, there are problems that these labels for preventing re-pasting are expensive, an adhesive remains on the peeled surface and sticky to the touch, or dusts are adhered on the surface.

However, this method is not only complicated but also inferior in water resistance when paper made of pulp is used as the surface material of the first layer, so that the surface material is easily broken and peeled off from the material adhered when it is brought into contact with water.

Therefore, this label is not suited to be a label for a sealed vessel containing water, e.g., pickles, tofu (bean curd), konjak (devil's tongue), etc.