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Tamper indicating retroreflective article

A technology of interference indication and retroreflection, applied in display devices, illuminated signs, identification devices, etc., can solve the problem that the silicone layer does not bring the expected effect.

Inactive Publication Date: 2004-05-12
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the silicone material is considered by those skilled in the art to be a typical peelable material, the addition of the silicone layer did not bring the desired effect

Method used

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  • Tamper indicating retroreflective article
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  • Tamper indicating retroreflective article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] Preparation of Stretchable Peelable Laminates Consisting of LLDPE Films with Pressure Sensitive Adhesive Layers on Both Sides

[0126] Prepare the first pressure-sensitive adhesive (PSA) earlier, it comprises the copolymer of isooctyl acrylate (IOA) and acrylic acid (AA), its weight ratio is that 95 parts of IOA are equipped with 5 parts of AA, this copolymer is placed in weight ratio A 30 / 70 mixture of isopropanol and heptane had a solids content of 25% and an intrinsic viscosity (I.V.) of 1.5. Apply this PSA onto silicone-coated release paper using a laboratory knife coater and dry in a forced-air oven to a 10 μm thick dry adhesive coating weight of approximately 10 g / m 2 .

[0127] Take SKYMAX 390 manufactured by Skymark Ltd, Scunthorpe, UK, which is a 38 μm thick transparent polymeric film of linear low density polyethylene (LLDPE) (corona treated on one side). The corona treated side of the LLDPE film was laminated to the exposed surface of the pressure sensiti...

Embodiment 2

[0154] This example is the same as Example 1 except for the following: a coating in the form of a discontinuous pattern between the third transparent polymer layer and the aluminum vapor deposited coating, which is formed by Byk Chemie GmbH (Wesel, Germany) BYK 354, which is a solution in polyacrylate, was further diluted with methyl ethyl ketone (MEK) to a solids content of 0.8%, and then coated in a checkerboard pattern as in Example 1.

[0155] The produced adhesive labels were tested for their release properties and durability. The measured results are summarized in Table 2 to Table 6.

Embodiment 3

[0157] This example is similar to Example 1 except that a single layer of high tack acrylate based pressure sensitive adhesive is used instead of a stretch release laminate consisting of adhesive coated LLDPE.

[0158] The first pressure sensitive adhesive described in Example 1 is a 10 μm thick copolymer of isobutyl acrylate (IOA) and acrylic acid (AA), the weight ratio of isobutyl acrylate (IOA) to acrylic acid (AA) being 95: 5 (as described in Example 1). This pressure-sensitive adhesive was applied to the peelable layer-coated surface of the polyester film by using a knife coater, followed by drying.

[0159] In this example this single thin layer of pressure sensitive adhesive was laminated to the aluminum vapor deposited coating of the retroreflective sheeting prepared in Example 1.

[0160] The completed adhesive labels are attached to painted steel panels. When the adhesive label was removed from the substrate, its retroreflective sheeting partially separated, formin...

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PUM

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Abstract

A tamper-indicating article for attachment to a surface of a substrate comprises (a) a retroreflective sheet and (b) an adhesive layer, wherein the retroreflective sheet comprises a reflective layer, a non-silicone-based release layer adjacent to the reflective layer, and a layer of lenses overlying said release layer and positioned in optical connection with said reflective layer so as to produce retroreflection. The article exhibits an interlayer cohesive failure at the release layer of the retroreflective sheet when an attempt is made to remove the article from the substrate surface.

Description

[0001] field of invention [0002] The present invention relates to adhesive-coated tamper-indicated retroreflective articles. Background of the invention [0003] Retroreflective sheeting is well known. Retroreflective sheeting and / or methods for its production are described in US Pat. Nos. 2,407,680 (Palmquist et al.), US 3,190,178 (McKenzie), US 3,700,305 (Bingham), US 4,075,049 (Wood), and US 4,896,943 (Bailey et al.). A retroreflective sheeting is a multilayer structure that usually includes, among other layers, a reflective layer such as an opaque aluminum material and a lens layer such as a single layer of glass microspheres with an interlayer between the two layers. Optical connectivity, which allows retroreflection. Light entering from the outer major surface of the retroreflective sheeting near the lens layer is focused by the lens and reflected by the reflective layer back to the viewer. [0004] Retroreflective sheets or layers have been used in adhesive coated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/122G02B5/128G09F3/00G09F3/02G09F3/03G09F3/10G09F13/16
CPCG02B5/128Y10T428/24372Y10T428/14G09F3/0292G09F3/02
Inventor P·欣森-格尔曼F·D·麦
Owner 3M INNOVATIVE PROPERTIES CO