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Dry adhesives

a technology of adhesives and adhesives, applied in the field of dry adhesives, can solve the problems of ink soluble, complicated branched structure of gecko's setae, and image printing with such inks may not be waterfas

Inactive Publication Date: 2013-12-05
MYLAN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gecko's setae have a complicated branched structure.
However, there are a number of problems and / or disadvantages associated water-based inks.
A first problem is that these inks are water soluble.
Therefore, the images printed with such inks may not be waterfast.
A small drop of water can cause severe smearing of the information on the printed image.
The smeared image may often be irrecoverably damaged and / or information on the image may be permanently lost.
Another problem associated with images printed with inkjet printers is archival.
Images printed with inkjet printers have a limited lifetime due to low lightfastness of the inks involved.
Dye based inks tend to fade in a relatively short time.
Further, each color has a tendency to fade at a different rate leading to a change in the image color balance.
These VOCs make these inks less environmentally friendly.
In such hot melt lamination processes, the thickness of the laminating film is limited by heat transfer constraints.
This is because polymers used to make these films typically are thermal insulators that do not conduct heat very well.
A disadvantage of such laminating films is that complex laminating equipments is typically required to apply the required heat and / or pressure in order to adhere the laminating film to the printed image.
Further, the bond between the printed image and laminating film is generally permanent and thus the laminating film may not be readjusted or removed once the lamination process is completed.

Method used

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  • Dry adhesives
  • Dry adhesives
  • Dry adhesives

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 5

Micro-Featured and Nano-Featured Surfaces

[0284]The surface of aluminum sheets of a thickness of about 0.30 mm were treated according to process 200 as described above using various conditions. These different process conditions are shown in Table III below.

TABLE IIIProcessingEXAMPLESStepsConditions12345DegreasingNaOH and sodiumYesYesYesYesYesgluconateMechanicalNylon brush & pumiceNoNoYesNoYesGrainingstone powderElectrolyticHCl (6.00 g / L)1,000GrainingHCl (8.00 g / L) &1,250270276(C / dm2)CH3COOH (16.0 g / L)HNO3 (10 g / L)160AnodizationH2SO4 (140 g / L)5.605.605.605.60(A / dm2)H3PO4 (160 g / L)7.00FunctionalizationNaH2PO4 (50.0 g / L) &YesYesYesNaF (0.80 g / L)Vinyl phosphoric andYesacrylic copolymer(0.30 g / L)Oxide weight2.701.802.702.20(g / m2)Ra (μm)0.650.520.270.420.60RSm (nm)242622044200

[0285]In Example 1, the surface of the aluminum sheet was pre-treated by degreasing, micro-featured by electrolytic graining in a 6.0 g / L HCl solution with 1,000 C / dm2 of alternating current density, nano-featured by...

example 6

Micro-Featured and Nano-Featured Surface

[0290]A biaxially oriented polyethylene terephthalate film (PET) having a thickness of 30 μm and containing 30° A Zeolite A (mean particle size 1.0 μm) and 5% calcium carbonate (mean particle size 2.0 μm) was extruded 260° C. from a twin screw extruder. It was then stretched to a 3:1 ratio at 130° C. The stretched film was then dipped in a 2M hydrochloric acid solution at 40° C. for 24 hours to partially dissolve the calcium carbonate, which created micropores on the surface. The treated film was then washed with water and dried in a hot air oven at 110° C. It was then dipped in an aqueous polymeric solution containing 5% of silica colloid particles (Ludox HS40 and Ludox SK, available from Dupont, USA), and then dried in a hot air oven at 120° C. This created nanopores on the surface. For this surface, the Ra is about 0.50 μm and RSm is 400 nm. FIG. 5 shows a scanning electron micrograph of the treated PET film.

Observations Concerning Examples...

example 7

Self-Adhesive

[0301]An anodized aluminum sheet (size 20 cm×30 cm, thickness of 0.15 mm) comprising micro-features and nano-features (Ra 0.25 μm and RSm 26 nm) was provided in accordance with the above. The sheet was dipped into an ethanol solution containing 5 g / L of triethoxysilane and a trace of hydrochloric acid at room temperature. The sheet was then dried in a hot air oven at 80° C. for 3 minutes. A heat curable silicone elastomer composition (QLE1031, available from Quantum Silicones, Virginia, USA) was screen printed on the treated aluminum sheet to form a pattern of round dots having a diameter about 2.0 mm. The spacing between the round dots was about 4.0 mm. The sheet was then cured at 150° C. for 20 minutes in a hot air oven to produce surface tack-free silicone compliant dots having a thickness of about 30 μm and which strongly adhered to the porous aluminum sheet. The hardness of the silicone compliant dots was measured and was found to be about 25 Shore-A.

[0302]A second...

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Abstract

A dry adhesive comprising a micro-featured and nano-featured surface, and a compliant surface having a hardness of about 60 Shore A or less, the micro-featured and nano-featured surface and the compliant surface being capable of forming upon contact a dry adhesive bond with each other.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit, under 35 U.S.C. §119(e), of the following U.S. provisional applications:[0002]U.S. provisional application Ser. No. 61 / 485,700, filed on May 13, 2011,[0003]U.S. provisional application Ser. No. 61 / 486,382, filed on May 16, 2011,[0004]U.S. provisional application Ser. No. 61 / 486,951, filed on May 17, 2011,[0005]U.S. provisional application Ser. No. 61 / 499,864, filed on Jun. 22, 2011, and[0006]U.S. provisional application Ser. No. 61 / 566,777, filed on Dec. 5, 2011,and of international patent application PCT CA2012 / 050101, filed on Feb. 21, 2012.All documents above are incorporated herein in their entirety by reference.FIELD OF THE INVENTION[0007]The present invention relates to dry adhesives.BACKGROUND OF THE INVENTION[0008]Metals, glass, and plastics are common fabrication materials used in many commercial and industrial applications. The surfaces of these materials have a wide range of finishes. The finish...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09J153/02C09J7/00
CPCC09J153/02C09J7/00B32B3/00C09J109/06C09J183/04B32B27/10B32B27/36B32B2255/10B32B2255/26B82Y30/00Y10T428/24355Y10T428/24479C09J2301/31A63B65/02A63F9/02C09J201/00B32B3/30B81B1/002B81B2203/0315B32B2367/00B32B2405/00
Inventor NGUYEN, MY T.BUI, LOC VINH
Owner MYLAN GRP