ADHESIVE SYSTEM FOR INCREASING THE ADHESION BETWEEN A DEVICE AND THE SKIN OF A USER

Abstract

An adhesive system for increasing the adhesion between a device and the skin of a user. The adhesive system has a first coating component for applying to the device and a second coating component for applying to the skin. The first coating component and the second coating component each have a relatively low surface tackiness. However, upon contact of the first coating component with the second coating component, a relatively high degree of adhesion is obtainable. A method for producing an adhesion effect, a kit, and a use of an adhesive system is also disclosed.

Claims

1. An adhesive system for increasing the adherability between a piece of equipment and skin of a user, the adhesive system comprising a first coating component for application to at least part of the piece of equipment, and a second coating component for application to at least part of the skin, inside of the palm, or of a fingertip, of the user, where the first coating component and the second coating component each have per se surface tack >35 cm according to the ASTM standard D3121 06 rolling ball test, wherein on contact of the first coating component with the second coating component an adhesion is attainable of between 2 and 20 N/25 mm.

2. The adhesive system as claimed in claim 1, where the first coating component comprises a dispersion.

3. The adhesive system as claimed in claim 1, where the second coating component comprises a dispersion of polyurethane and of at least one additive, the at least one additive being selected from the group consisting of: polyvinyl-pyrrolidone; copolymers of polyvinylpyrrolidone; modified polyvinylpyrrolidone; acrylate dispersions; dispersions and solutions of sugar-based raw materials, pectins, gum arabic, cellulose derivatives, or rubber; other polyurethane dispersions; silane additives; silicone, or mixtures thereof.

4. A method for generating an adhesive effect between a piece of equipment and skin of a user by means of an adhesive system, comprising the steps of: i) providing a first coating component, ii) applying the first coating component to at least part of a piece of equipment, iii) drying the first coating component, iv) providing a second coating component, v) applying the second coating component to at least part of the skin of the user, vi) drying the second coating component, with both coating components each per se having a surface tack >35 cm, according to the ASTM standard D3121-06 rolling ball test, contacting the at least partly coated piece of equipment with the at least partly coated skin, characterized in that on contact of the first coating component with the second coating component an adhesion is attained of between 2 and 20 N/25 mm, according to a T peel test.

5. The method as claimed in claim 4, where the layer thickness of the applied and dried first coating component and second coating component is in each case between 5 and 100 m.

6. The method as claimed in claim 4, where the application of the first coating component and of the second coating component is repeated.

7. A kit for an adhesive system, for generating an adhesive effect between a piece of equipment and the skin of a user, the kit comprising: a first coating component for application to a piece of equipment, a second coating component for application to skin, and operating instructions for use of the coating components.

8. The kit as claimed in claim 7, where the kit further comprises a cleaning lotion.

9. The use of an adhesive system as claimed claim 1 for generating an adhesive effect between the piece of equipment and the skin of the user.

10. The use of a first coating component in an adhesive system together with a second coating component, for generating an adhesive effect between a piece of equipment and skin of a user.

11. The use of a second coating component in an adhesive system together with a first coating component, for generating an adhesive effect between a piece of equipment and skin of a user.

12. The method as claimed in claim 4, where the application of the first coating component or the application of the second coating component is repeated.

Description

EXAMPLE 1: USE IN THE HANDBALL SPHERE

Production and Composition of the Coatings

Equipment Coating Component

[0054] The equipment coating component is applied to the handball to obtain adhesion between skin and handball.

Composition:

[0055]

TABLE-US-00001 Raw materials Fraction Composition Example [wt %] Polyurethane dispersion Baymedix AD111 85-95 from Covestro Water, deionized n/a 5-15 Wetting agent Surfynol PSA 336 0-1

[0056] Water and wetting agent are added to the PU dispersion, and then the three ingredients are mixed with one another by stirring.

Skin Coating Components:

[0057] The skin coating component is applied to the hand to obtain adhesion between handball and hand.

Skin Coating Component 1

Composition:

[0058]

TABLE-US-00002 Raw materials Fraction Composition Example [wt %] Aqueous polyvinyl- Luvitec K90 solution 40-60 pyrrolidone (PVP) solution, approx. 20% from BASF 20%, K value: 90 Polyurethane dispersion Baymedix AD111 from 60-40 (PUD), 50%, pH: 6-9 Covestro

[0059] The PVP solution is added to the PU dispersion, and then the two ingredients are mixed with one another by stirring.

Skin Coating Component 2

[0060] Composition:

TABLE-US-00003 Raw materials Fraction Composition Example [wt %] Acrylate dispersion Collano DP 7011 5-20 from Collano Polyurethane dispersion Baymedix AD111 80-95 (PUD), 50%, pH: 6-9 from Covestro

[0061] The acrylate dispersion is added to the PU dispersion, and then the two ingredients are mixed with one another by stirring.

Use of the Coatings

Application of Equipment Coating Component:

[0062] The equipment coating component is applied using a brush roller to a handball and then dried for 30-35 minutes. The drying time of the ball coating component may be influenced by addition of additives, the mode of drying, or the mode of coating. The layer thickness of the dry ball coating achieved using the brush roller is between 30 and 50 m.

Application of Skin Coating Component:

[0063] The skin coating component is applied using a brush to fingertips and palms and then dried for 3-10 minutes. The drying time of the skin coating component may be influenced by addition of additives, the mode of drying, or the mode of coating. Where the coating technique described above is employed, the layer thickness of the dried skin coating is between 11 and 66 m.

Comparison of the Coating Components to Handball Resin

[0064] Various formulations were tested for adhesive transfer, surface tack, and adhesion. The composition for the ball coating component was kept constant here, while the composition of the skin coating component was varied. The reference used was the G-Resin for Handball, manufactured by Molten Europe GmbH.

Composition of the formulations (details in percent by weight):

TABLE-US-00004 Handball Ball Skin Skin resin coating coating 1 coating 2 (resin) (BB) (H1) (H2) PUD 91.9 50 80 Aqueous PVP solution 50 Acrylate dispersion 20 Wetting agent 0.8 Water 7.3 Handball resin 100

1. Ball Coating Component (BB) and Skin Coating Component 1 (H1) Adhesive Transfer:

[0065] In order to ascertain the extent to which an adhesive leaves residues on other surfaces, the finger grip test technique was developed. This involves the coating of skin (in this case, the tip of the right-hand index finger of a test individual) and of synthetic handball leather with the coatings under investigation. Prior to application, the fingertip is cleaned with isopropanol and the coating is dried in air at room temperature for three to five minutes. The ball coating is applied by means of a doctor blade with a coating weight of 2.5 g/m2 to the handball leather, and the coated substrate is dried at 50 C. for at least 30 minutes.

[0066] With application of force (20 to 25 N), fingertip and ball are pressed against one another for 10 seconds, after which the finger is rolled off sideward from the (coated) synthetic leather.

[0067] The adhesive transfer is evaluated qualitatively.

[0068] The adhesive transfer of H1 and BB is compared using the finger grip test with the adhesive transfer of resin.

Results:

[0069]

TABLE-US-00005 One side BB, Criterion Both sides resin Both sides BB one side H1 Tack of +++ + + individual surface Adhesion between +++ +++ +++ coated surfaces Adhesive transfer +++ +++ Cleaning effort +++ + Key: +++ substantial, + slight, none

Adhesion:

[0070] The adhesion between H1 and BB was compared with the adhesion of resin using a T-peel test (as described above). For this purpose, the coating components BB and H1 were applied by doctor blade to a polyester film 22 m thick (support material) and dried at 50 C. for 30 minutes; the resulting layer thicknesses were 293 and 202 m, respectively. Resin was dissolved in toluene (resin:toluene mixing ratio 2:1), then applied by doctor blade to a polyester film 22 m thick, and dried at 50 C. for 15 minutes. The resulting layer thickness was 204 m. An explanation for the higher T-peel values between H1 and BB is that the fracture mode is different; resin is inherently more elastic and therefore tends more toward cohesive fracture.

Results:

[0071]

TABLE-US-00006 System Adhesion [N/25 mm] BB vs. H1 .sup.5-7 coating (Adhesive fracture between equipment coating and skin coating. In some cases adhesive fracture with respect to the support material as well) Resin vs. resin 2.5-3 coating (Cohesive fracture)

Surface Tack:

[0072] The surface tack of BB and H1 was compared with that of resin using the rolling ball test according to ASTM standard 3121-06. For this purpose, the coating components BB and H1 were applied by doctor blade to a polyester film 22 m thick, and dried at 50 C. for 30 minutes; the resulting layer thicknesses were 293 and 202 m, respectively. Resin was dissolved in toluene (resin:toluene mixing ratio 2:1), then applied by doctor blade to a polyester film 22 m thick, and dried at 50 C. for 15 minutes. The resulting layer thickness was 204 m. The results in the table below show that H1 and BB have a lower surface tack than resin.

Results:

[0073]

TABLE-US-00007 System Rolling Ball [cm] H1 >40 BB >40 Resin 26-31

2. Ball Coating Component (BB) and Skin Coating Component 2 (H2)

[0074] As well as PVP, other systems were also considered as skin-adhering component of the skin coating component. For example, films of acrylate dispersions having PSA properties are known to possess effective skin adhesion.

[0075] Adhesive transfer, surface tack, and adhesion of the formulation H2 were determined as described above. For this purpose, the coating components BB and H2 were applied by doctor blade to a polyester film 22 m thick, and dried at 50 C. for 30 minutes, the resulting layer thicknesses were 293 and 303 m, respectively.

[0076] In view of the low acrylate concentration, there is no significant increase in the surface tack of H2 relative to that of H1. The adhesion between H2 and BB, as well, is comparable with that between H1 and BB (cf. table below).

Results of Surface Tack and Adhesion of BB and H2:

[0077]

TABLE-US-00008 Test method/[unit] Value Rolling ball test/[cm] >40 T-peel test/[N/25 mm] 7-8.5 (Adhesive fracture between ball coating and skin coating. In some cases, adhesive fracture with respect to support material as well)

[0078] However, the acrylate concentration is too low to generate sufficiently high skin adhesion; on contact H2 is transferred to BB. Higher acrylate concentrations would entail an increased surface tack, which would not be in the sense of the invention.

Comparison of Additives: H1 vs. H2

TABLE-US-00009 Both sides One side BB One side BB Criterion handball resin One side H1 One side H2 Tack of individual +++ + + surface Adhesion between +++ +++ +++ coated surfaces Adhesive transfer +++ + Cleaning effort +++ + Key: +++ substantial, + slight, none

EXAMPLE 2: USE IN THE POLE-VAULTING SPHERE

[0079] The equipment coating component identified in example 1 (BB) is applied using a brush roller to the upper part of a glass fiber pole for pole vaulting, and dried in the air for 45 minutes. The layer thickness is between 40 and 70 m.

[0080] The skin coating component identified in example 1 (H1) is applied using a brush to the inside hand area of the pole vaulter, and dried in the air for 10 minutes. The layer thickness is between 11 and 66 m.

[0081] Adhesive transfer, surface tack, and adhesion of the formulation were assessed qualitatively in comparison to tree resin, grip tapes with and without magnesia, adhesive grip tapes, and spray adhesive.

[0082] The formulation proves to have very good adhesion especially in comparison to grip tapes and/or magnesia. Nevertheless, it is also possible to exert control over the push-off and release of the pole in the concluding flight phase of a pole vault. In comparison to tree resin, the advantages arise that are associated with the reduced surface tack. In other words, the coating components simplified handling, and contamination by dust and other foreign particles is reduced. By virtue of the thin application layer, the uniform pole diameter required by the competition rules is maintained.

EXAMPLE 3: USE IN THE E-SPORTS SPHERE

[0083] The equipment coating component (BB) identified in example 1 is applied using a brush to the joystick elements of the controller of a games console, and dried in the air for 25 minutes. The layer thickness is between 30 and 60 m.

[0084] The skin coating component (H1) identified in example 1 is applied using a brush to the fingertips of the gamer, and dried in the air for 10 minutes. The layer thickness is between 11 and 66 m.

[0085] Even with a relatively thin application layer, the formulation has positive effects on the temporal and spatial precision with which commands are triggered, ultimately increasing the performance of the player. Over long playing times, the hand also becomes fatigued less quickly. In contrast to known gamer gloves or slip-resistant patches which are adhered to the fingertips, the adhesion system is pleasing to wear. In comparison to gamer grip, which like magnesia dries skin and prevents perspiration, the adhesive effect is superior.