Unlock instant, AI-driven research and patent intelligence for your innovation.

Removable adhesive tape

a technology of adhesive tapes and adhesive strips, applied in the field of adhesive tapes, can solve the problems of paper, paper, paper, etc., and achieve the effect of reducing the difficulty of removal without damaging the substrate, reducing the adhesion and adhesion of adhesive strips

Inactive Publication Date: 2009-06-11
3M INNOVATIVE PROPERTIES CO
View PDF51 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The present invention provides an easily removable, pressure-sensitive adhesive tape comprising a highly extensible, substantially non-recoverable backing, bearing on at least one major surface thereof a layer of pressure-sensitive adhesive, said tape being capable of being firmly bonded to a substrate and being further capable of being removed therefrom after only being stretched at an angle no greater than about 35° from the surface of the substrate.
[0009]The adhesive layer has sufficient shear strength and adhesive holding power for the specific applications, its adhesive holding power to any substrate preferably being less than its cohesive strength, such that the adhesive layer will not separate from the backing when the backing is subjected to stretching. The adhesive layer is also preferably highly extensible.

Problems solved by technology

Adhesive tapes, such as, for example, pressure-sensitive adhesive tapes, are usually firmly bonded to substrates because subsequent separation of the tapes from the substrates is neither intended nor desired.
Adhesives formulated to provide a substantial level of adhesion, e.g., greater than 30 oz. / in. adhesion to paper, are generally difficult to remove without damaging the substrate.
This recoil characteristic can be dangerous, and increases the force required to debond these tapes at low angles.
Finally, these highly elastic tapes tend to substantially recover their original shape when the stretching force is removed, and they are therefore not useful for indication of tampering or for guaranteeing single uses for hygienic purposes.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Removable adhesive tape
  • Removable adhesive tape
  • Removable adhesive tape

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068]An adhesive was made by partially polymerizing 100 g of a blend containing 90% by weight isooctylacrylate monomer and 10% by weight acrylic acid monomer and 0.04 part per hundred 2,2-dimethoxy-2-phenyl acetophenone (“Irgacure 651”) to yield a coatable syrup having a viscosity of about 5,000 cps. To this syrup was then added an additional 0.25 g of a blend containing 90% by weight isooctylacrylate monomer and 10% by weight acrylic acid monomer and 0.04 part per hundred 2,2-dimethoxy-2-phenyl acetophenone (“Irgacure 651”), plus 0.125 g of 1,6-hexanediol diacrylate crosslinking agent. The composition was thoroughly mixed and coated onto a silicone-coated polyester film by means of a knife coater adjusted to produce an adhesive thickness of about 125 mm. After the coated syrup was purged thoroughly with nitrogen gas, it was covered with a second silicone-coated polyester film and polymerized by means of ultraviolet radiation using a total energy of 450 mJ / cm2. The polyester liners...

examples 2-6

[0071]The tapes of these examples were made in the same manner as were the tapes of Example 1, except the level of crosslinking agent was varied, as shown in Table 3.

TABLE 3180°180°DynamicStretchAmount ofadhesionadhesionshearreleasecrosslinkingto steelto paperholdingadhesionagent (%)(N / dm)(N / dm)power (N / dm)(N / dm)0.015441.618340.8 0.0255542.219242.80.055841.820143.80.104937.620244.70.183934.420746.3Tackified3542.218049.1IOA / AA**Tackified IOA / AA contained 90 parts isocctyl acrylate, 10 parts acrylic acid, and 10 parts tackifier (“Foral-85”), available from Hercules, Inc.).

[0072]The data clearly show that increasing the concentration of crosslinking agent decreases 180° peel adhesion while increasing holding power (dynamic shear). Surprisingly, the level of low angle debonding increases as level of crosslinking agent increases.

example 7

[0073]The tape of this example was made in the same manner as was the tape of Example 1 except that 10 parts of tackifier (a rosin ester, “Foral 85”, available from Hercules, Inc.) was also added. The adhesion forces were measured and are set forth in Table 3. The data show that the addition of tackifier clearly increased the debonding force at a peel angle of 0°.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Login to View More

Abstract

A removable adhesive tape comprising a highly extensible and substantially inelastic backing and a layer of pressure-sensitive adhesive. The backing has a high tensile strength, has a lengthwise elongation at break of at least about 150% with less than about 50% elastic recovery after stretching. The adhesive can be a normally tacky and pressure-sensitive adhesive and is coated on at least one surface of the film backing. The adhesive is preferably highly extensible, does not separate from the backing during stretching, and has higher cohesion than adhesion to any suitable substrate. After being applied to a substrate, the adhesive tape of the present invention becomes firmly bonded, but can be easily removed without damaging the substrate by simply stretching it in a direction substantially parallel, i.e., less than about 35°, to the surface of the substrate.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to adhesive tapes, more particularly to tapes that can be firmly adhered to a substrate and can be removed without damaging the substrate.[0003]2. Discussion of the Art[0004]Adhesive tapes, such as, for example, pressure-sensitive adhesive tapes, are usually firmly bonded to substrates because subsequent separation of the tapes from the substrates is neither intended nor desired. However, there are adhesive tapes wherein the adhesives are specifically formulated to allow clean and easy removal from substrates after use, such as, for example, the adhesive used for “Post-It” brand removable notes. These adhesives usually do not exhibit a substantial level of holding power, e.g., greater than 4 to 6 oz. / in. adhesion to standard copy paper. Adhesives formulated to provide a substantial level of adhesion, e.g., greater than 30 oz. / in. adhesion to paper, are generally difficult to remove without ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B32B38/00A47G1/17C09J7/24
CPCA47G1/175C09J7/0267C09J2201/618Y10T428/28Y10T428/1303Y10T156/1147Y10T428/2839Y10T428/2861Y10T428/2848Y10T428/24752C09J7/24Y10T428/249983C09J2301/308
Inventor KRECKEL, KARL W.HAGER, PATRICK J.RICKERT, JAMES H.
Owner 3M INNOVATIVE PROPERTIES CO