Claims:WE CLAIM:
1. A latex composition comprising synthetic elastomeric ionomer and surfactant, optionally along with component selected from a group comprising tackifier and natural rubber latex and a combination thereof.

2. The latex composition as claimed in claim 1, wherein the latex composition comprises synthetic elastomeric ionomer and surfactant.

3. The latex composition as claimed in claim 1, wherein the latex composition comprises synthetic elastomeric ionomer, surfactant and tackifier.

4. The latex composition as claimed in claim 1, wherein the latex composition comprises synthetic elastomeric ionomer, surfactant and natural rubber latex.

5. The latex composition as claimed in claim 1, wherein the latex composition comprises synthetic elastomeric ionomer, surfactant, tackifier and natural rubber latex.

6. The latex composition as claimed in any one of claims 1 to 5, wherein the synthetic elastomeric ionomer is selected from a group comprising butyl ionomer, halobutyl ionomer, styrene-butadiene, poly-butadiene, acrylonitrile-butadiene ionomer, poly-isoprene, halogenated poly-isoprene ionomers and a combination thereof.

7. The latex composition as claimed in any one of claims 1 to 5, wherein the surfactant is selected from a group comprising anionic surfactant, non-ionic surfactant and a combination thereof.

8. The latex composition as claimed in claim 7, wherein the anionic surfactant is selected from a group comprising sodium dodecyl benzene sulfonate, lauryl sulphate, fatty and alcohol based phosphate, and any combination thereof; and the non-ionic surfactant is selected from a group comprising octylphenol ethoxylate, oleyl cetyl alcohol ethoxylate, nonylphenol ethoxylate ,and any combination thereof.

9. The latex composition as claimed in any one of claims 1, 3 and 5, wherein the tackifier is selected from a group comprising coumarone indene resin, guar gum, rosin esters, aliphatic aromatic resins, and any combination thereof.

10. The latex composition as claimed in any one of claims 1 to 5, wherein the synthetic elastomeric ionomer is in an amount ranging from about 2wt% to 25 wt% of solid content.

11. The latex composition as claimed in any one of claims 1 to 5, wherein the surfactant is in an amount ranging from about 1wt% to 20wt%.

12. The latex composition as claimed in any one of claims 1, 3 and 5, wherein the tackifier is in an amount ranging from about 1wt% to 10wt%.

13. A process of preparing the latex composition as claimed in claim 1 comprising:
mixing a solution of the synthetic elastomeric ionomer and a solution of the surfactant;
optionally adding a solution of the tackifier to obtain the latex composition.

14. The process as claimed in claim 13, wherein the process further comprises adding natural rubber latex to the latex composition.

15. The process as claimed in claim 13, wherein the process comprises mixing the solution of the synthetic elastomeric ionomer and the solution of the surfactant vigorously for a duration ranging from about 10 minutes to 60 minutes at a temperature ranging from about 20 ºC to 40 ºC.

16. The process as claimed in claim 13, wherein the process comprises mixing the solution of the synthetic elastomeric ionomer, the solution of the surfactant and the solution of the tackifier vigorously for a duration ranging from about 10 minutes to 60minutes for a duration ranging from about 20 ºC to 40 ºC.

17. The process as claimed in claim 13, wherein the process further comprises subjecting the latex composition to evaporation through techniques selected from a group comprising rotavapor, supersaturated steam stripping and vacuum distillation.

18. The process as claimed in claim 13, wherein the solution of synthetic elastomeric ionomer is prepared by mixing the synthetic elastomeric ionomer in a solvent selected from a group comprising toluene, cyclohexane, xylene, hexane and heptane; the solution of the surfactant is prepared by mixing the surfactant in a solvent selected from a group comprising distilled water, butyl alcohol and isobutyl alcohol; and the solution of the tackifier is prepared by mixing the tackifier in a solvent selected from a group comprising toluene, cyclohexane, xylene, hexane and heptane.

19. A cohesive product comprising the latex composition as claimed in claim 1 and base material.

20. The cohesive product as claimed in claim 19, wherein the latex composition is in an amount ranging from about 2wt% to 10wt%.

21. The cohesive product as claimed in claim 19, wherein the base material is composed of woven or non-woven fabric of natural and artificial polymeric fiber.

22. The cohesive product as claimed in claim 19, wherein the cohesive product is selected from a group comprising self-adhesive bandage, self-adhesive cushion, and reusable packaging material.

23. A process of preparing the cohesive product as claimed in claim 19 comprising spraying the latex composition as claimed in claim 1 on surface of the base material to obtain the cohesive product.

Dated this 18th day of June 2020
Signature:
To: Name: Durgesh Mukharya
The Controller of Patents Of K&S Partners, Bangalore
The Patent Office, at Mumbai Agent for the Applicant
IN/PA No. 1541

, Description:TECHNICAL FIELD
The present disclosure relates to polymer sciences. Particularly, the present disclosure relates to a latex composition comprising synthetic elastomeric ionomer and surfactant, optionally along with a component selected from a group comprising tackifier, natural rubber latex and a combination thereof. The said composition is particularly devoid of halogenated solvent, fillers and amine based alcohols. The present disclosure further relates to a cohesive product comprising the said latex composition and a base material. The disclosure furthermore relates to processes of preparing the said latex composition and the cohesive product.

BACKGROUND OF THE DISCLOSURE
The cohesive products have the ability to adhere itself and do not stick to foreign surfaces. The examples of the cohesive products are self-adhesive bandages used in medical and sports to support the tissues a secondary healing material. Such cohesive products are superior to conventional non-cohesive product as they provide optimum support to muscles to heal the tissues faster. However, conventional cohesive products use pins and clips to tie their ends that exerts discomfort to injured tissues Additionally, the material employed in the preparation of cohesive products are mostly natural latex for adequate product performance properties, however, there are reports of natural latex in the cohesive products causing allergic reaction upon usage. Thus, causing problems in long term usage of the existing cohesive products made from natural latex.

Conventionally, the cohesive products are prepared by dipping process, wherein the base material is subjected to dipping in the rubber latex. The said dipping process requires high amount of coating material, limits the breathable nature (loss of air permeability) and alter the mechanical properties of base material.

Thus, there is a need to prepare an appropriate material/composition for preparing a cohesive product which overcomes all the limitations or drawbacks existing in the art and that the prepared composition and cohesive product should be environmental friendly and economical.

SUMMARY OF THE DISCLOSURE
Accordingly, the object of the present disclosure is to provide a latex composition which is economical, environmentally friendly and possesses superior properties.

The latex composition of the present disclosure comprises synthetic elastomeric ionomer and surfactant, optionally along with a component selected from a group comprising tackifier, natural rubber latex and a combination thereof. The Latex composition of the present disclosure is devoid of halogenated solvent, fillers and amine-based alcohols. Thus, the latex composition of the present disclosure is economical and environmentally friendly.

The present disclosure further describes an environmentally friendly and economical process for preparing the latex composition described above.

The present disclosure further describes a cohesive product comprising the said latex composition and a base material, wherein the cohesive product does not employ pins and clips to tie their ends. This is because, the above mentioned latex composition provides for improved cohesiveness of the cohesive product Thus, the cohesive product of the present disclosure does not cause any discomfort to injured tissues.

The present disclosure further describes a simple and cost-effective process of preparing a cohesive product employing the above described latex composition and a base material. Further, the process of preparing the cohesive product of the present disclosure does not cause loss in air permeability of the base material and does not alter the mechanical properties of the base material, when compared to conventional processes available for preparing cohesive products.

BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
In order that the present disclosure may be readily understood and put into practical effect, reference will now be made to exemplary embodiments as illustrated with reference to the accompanying figures. The figures together with detailed description below, are incorporated in and form part of the specification, and serve to further illustrate the embodiments and explain various principles and advantages, in accordance with the present disclosure where:

Figure 1 pictorially depicts the process of preparing the cohesive product of the present disclosure by spraying technique.

Figure 2 illustrates the images of the cohesive product (self-adhesive bandage) of the present disclosure bound to human arm without any clips.

DETAILED DESCRIPTION
The present disclosure relates to a latex composition comprising synthetic elastomeric ionomer and surfactant, optionally along with component selected from a group comprising tackifier, natural rubber latex and a combination thereof.

In an embodiment of the present disclosure, the latex composition comprises synthetic elastomeric ionomer and surfactant.

In another embodiment of the present disclosure, the latex composition comprises synthetic elastomeric ionomer, surfactant and tackifier.

In another embodiment of the present disclosure, the latex composition comprises synthetic elastomeric ionomer, surfactant and natural rubber latex.

In another embodiment of the present disclosure, the latex composition comprises synthetic elastomeric ionomer, surfactant, tackifier and natural rubber latex.

In an embodiment of the present disclosure, the synthetic elastomeric ionomer of the latex composition is selected from a group comprising butyl ionomer, halobutyl ionomer, styrene-butadiene, poly-butadiene, acrylonitrile-butadiene ionomer, poly-isoprene, halogenated poly-isoprene ionomers and a combination thereof.

In an embodiment of the present disclosure, the synthetic elastomeric ionomers are the derivatives of ammonium and phosphonium, respectively.
In an embodiment of the present disclosure, the surfactant of the latex composition is selected from a group comprising anionic surfactant, non-ionic surfactant and a combination thereof.

In an embodiment of the present disclosure, the anionic surfactant is selected from a group comprising sodium dodecyl benzene sulfonate and other sulfonate based emulsifiers based on >C10 homologous hydrocarbons, lauryl sulphate and other sulphate based emulsifiers based on >C10 homologous hydrocarbons, fatty alcohol based phosphate and other phosphate based emulsifiers based on >C10 homologous hydrocarbons.

In an embodiment of the present disclosure, the non-ionic surfactant is selected from a group comprising octylphenol ethoxylate, oleyl cetyl alcohol ethoxylate, nonylphenol ethoxylate, PEG and its higher homologous non-ionic surfactants, Poly(alkylene ether) (e.g. ethylene oxide and propylene oxide) based random and block copolymers based surfactants and a combination thereof.

In an embodiment of the present disclosure, the tackifier of the latex composition is selected from a group comprising coumarone indene resin, guar gum, rosin esters, aliphatic aromatic resins and a combination thereof.

In an embodiment of the present disclosure, the latex composition comprises synthetic elastomeric ionomer in an amount ranging from about 2 wt% to 25 wt% of solid content.

In another embodiment of the present disclosure, the latex composition comprising synthetic elastomeric ionomer in an amount of about 2wt% of solid content, about 4wt% of solid content, about 6wt% of solid content, about 8wt% of solid content, about 10wt% of solid content, about 12wt% of solid content, about 14wt% of solid content, about 16wt% of solid content, about 18wt% of solid content, about 20wt% of solid content, about 21wt% of solid content, about 21wt% of solid content, about 22wt% of solid content, about 23wt% of solid content, about 24wt% of solid content or about 25wt% of solid content,

In an embodiment of the present disclosure, the latex composition comprises surfactant in an amount ranging from about 1 wt% to 20 wt%.

In another embodiment of the present disclosure, the latex composition comprises surfactant in an amount of about 1wt%, about 2wt%, about 3wt%, about 4wt%, about 5wt%, about 6wt%, about 7wt%, about 8wt%, about 9wt%, about 10wt%, about 11wt%, about 12wt%, about 13wt%, about 14wt%, about 15wt%, about 16wt%, about 17wt%, about 18wt%, about 19wt% or about 20wt%.

In an embodiment of the present disclosure, the latex composition comprises tackifier in an amount ranging from about 1wt% to 10wt%.

In another embodiment of the present disclosure, the latex composition comprises tackifier in an amount of about 1wt%, about 2wt%, about 3wt%, about 4wt%, about 5wt%, about 6wt%, about 7wt%, about 8wt%, about 9wt% or about 10wt%.

The latex composition of the present disclosure is devoid of halogenated solvent, fillers, and amine based alcohols.
The present disclosure further relates to a process for preparing the said latex composition.

The process of preparing the latex composition described above is a simple solution based blending process carried out at room temperature.

In an embodiment of the present disclosure, the process of preparing the said latex composition comprises:
mixing a solution of the synthetic elastomeric ionomer and a solution of the surfactant;
optionally adding a solution of tackifier to obtain the latex composition.

In an embodiment of the present disclosure, the process of preparing the said latex composition comprises- mixing a solution of the synthetic elastomeric ionomer and a solution of the surfactant to obtain the latex composition.

In an embodiment of the present disclosure, during the process of preparing the latex composition, the solution of the synthetic elastomeric ionomer and the solution of the surfactant is mixed vigorously for a duration ranging from about _10 minutes to 60 Minutes at room temperature ranging from about 20 ºC to 40 ºC.

In another embodiment of the present disclosure, the during the process of preparing the latex composition, the solution of synthetic elastomeric ionomer and the solution of the surfactant is mixed vigorously for a duration of about 10minutes, about 15minutes, about 20minutes, about 25minutes, about 30minutes, about 35minutes, about 40minutes, about 45minutes, about 50minutes, about 55minutes or about 60minutes at a temperature of about 20 ºC, about 25 ºC, about 30 ºC, about 35 ºC or about 40ºC.

In another embodiment of the present disclosure, the process of preparing the said latex composition comprises mixing a solution of the synthetic elastomeric ionomer, a solution of the surfactant and a solution of the tackifier to obtain the latex composition.

In another embodiment of the present disclosure, during the process of preparing the latex composition, the solution of the synthetic elastomeric ionomer, the solution of the surfactant and the solution of the tackifier are mixed vigorously for a duration ranging from about _10 to 60 Minutes at a temperature ranging from about 20 ºC to 40 ºC.
In another embodiment of the present disclosure, during the process of preparing the latex composition, the solution of the synthetic elastomeric ionomer, the solution of the surfactant and the solution of the tackifier are mixed vigorously for a duration of about 10minutes, about 15minutes, about 20minutes, about 25minutes, about 30minutes, about 35minutes, about 40minutes, about 45minutes, about 50minutes, about 55minutes or about 60minutes at a temperature of about 20 ºC, about 25 ºC, about 30 ºC, about 35 ºC or about 40ºC

In an embodiment of the present disclosure, the process of preparing the latex composition comprises subjecting the obtained latex composition to evaporation for tuning solid content of the latex composition to a desired level. The solid content of the latex composition is ranging from about 5 wt% to 30 wt%.

In another embodiment of the present disclosure, the solid content of the latex composition is about 5 wt%, about 10 wt%, about 15 wt%, about 20 wt%, about 25 wt% or about 30 wt%,

In an embodiment of the present disclosure, in the process of preparing the latex composition, the latex composition is subjected to evaporation through rotavapour, supersaturated steam stripping and vacuum distillation, wherein the solvents in the latex composition are evaporated.

In an embodiment of the present disclosure, the solution of the synthetic elastomeric ionomer is prepared by mixing the synthetic elastomeric ionomer in a solvent selected from a group comprising toluene, cyclohexane, xylene, hexane, heptane and C5-C9 hydrocarbons based solvents . The said solvent in the in the process is used as benign solvent.
In an embodiment of the present disclosure, the solution of the surfactant is prepared by mixing the surfactant in a solvent selected from a group comprising distilled water, butyl alcohol, isobutyl alcohol and higher homologous alcohols having >C4.

In an embodiment of the present disclosure, the solution of the tackifier is prepared by mixing the tackifier in a solvent selected from a group comprising toluene, cyclohexane, xylene, hexane, heptane and C5-C9 hydrocarbons based solvents.

In an embodiment of the present disclosure, the process of preparing the latex composition further comprises adding natural latex rubber to the latex composition to obtain a blend of latex composition and natural rubber latex, wherein the ratio of synthetic elastomeric ionomer and natural rubber latex is in a ratio of about 1:4 (wt%).

In another embodiment, the ratio of the latex composition and the natural rubber latex in the blend is about 1:1 wt%, about 1:2 wt%, about 1:3 wt% or about 1:4 wt%

The present disclosure further relates to a cohesive product comprising the said latex composition and a base material.

In an embodiment of the present disclosure, the latex composition in the cohesive product is in an amount ranging from about 2wt% to 10wt%.

In another embodiment of the present disclosure, the latex composition in the cohesive product is in an amount of about 2wt%, about 3wt%, about 4wt%, about 5wt%, about 6wt%, about 7wt%, about 8wt%, about 9wt% or about 10wt%.

In an embodiment of the present disclosure, the cohesive product is selected from a group comprising Self-adhesive bandage, Self-adhesive cushions, reusable packaging based on woven and/or non-woven natural and/or synthetic fabrics, comprising the latex composition described above or the blend of latex composition described above and natural rubber latex, respectively.

In an embodiment of the present disclosure, the base material of the cohesive product is composed of woven or non-woven fabric of natural and artificial polymeric fibers.

In an embodiment of the present disclosure, the latex composition described above, or the blend of the latex composition described above and natural rubber latex, respectively acts as an adhesive in the cohesive product.

In an embodiment of the present disclosure, microparticles of the latex composition described above or the blend of the latex composition described above and natural rubber latex are uniformly distributed on the surface of the base material and the quantity of the said latex composition or the said blend of the latex composition and the natural rubber latex is regulated by controlling the pressure during application of the said latex composition or the said blend of the latex composition and the natural rubber latex on to the base material .

In an embodiment of the present disclosure, cohesiveness of individual layers of the cohesive product keeps each turn of cohesive product (for instance, bandage) to one another that gives support and firm binding, on the other hand, in general, conventional crepe bandages are tied at its end using clips to the rest of the part of bandage, which causes discomfort upon using the convention crepe bandage for longer duration.

In an embodiment of the present disclosure, the cohesive product described above has application in the field of medical and sports. The cohesive product supports the injured tissues and acts as a secondary healing surface.

In an embodiment of the present disclosure, the cohesive product has uniform distribution of latex composition or the blend comprising the latex composition and natural rubber latex on the base material.

In an embodiment of the present disclosure, the cohesive product is breathable and washable, respectively.

In an embodiment of the present disclosure, the cohesive product possesses antibacterial properties.

In an embodiment of the present disclosure, the latex composition or the blend of the said latex composition and natural rubber latex possesses cohesive properties that makes a self-adhesive surfaces when applied on a base material. Additionally, the ionic characters of ionomeric polymer in the latex composition or the blend of the latex composition and natural rubber latex enables it to make interactions between polar groups of base materials.

The present disclosure further relates to a process of preparing the said cohesive product.

In an embodiment of the present disclosure, the process of preparing the cohesive product comprises spraying the latex composition on surface of the base material, followed by applying the adhesive to obtain the cohesive product.

In another embodiment of the present disclosure, the process of preparing the cohesive product comprises spraying the blend comprising the latex composition described above and natural rubber latex at a ratio of about 1:4 (wt%) on the surface of the base material.

In an embodiment of the present disclosure, spraying the latex composition or the blend comprising the latex composition described above and natural rubber latex on to the base material improves the breathability of the cohesive product when compared to coating of the latex composition or the said blend because coating techniques blocks the breathability of the cohesive product. Due to spraying of the latex composition or the said blend causes deposition of fine particles of the latex composition or the said blend on the based material, as a result, the obtained cohesive product possesses improved breathability.

The latex composition described above or the blend comprising the latex composition and natural rubber latex is applied at an amount not more than 10% on the base material to obtain the cohesive product.

In an embodiment of the present disclosure, the process of preparing the cohesive product is simple and cost effective. Further, the process is advantageous over conventional dipping process, as the said dipping process requires high amount of coating material which limits the breathable nature (loss of air permeability) and alter the mechanical properties of the base material. On the contrary, the process of preparing the cohesive product described according to the present disclosure does not require high amount of coating material (latex composition), as a result, there is no loss of air permeability and there is no alteration to the mechanical properties of the base material.

Additional embodiments and features of the present disclosure will be apparent to one of ordinary skill in art based upon the description provided. The embodiments provide various features and advantageous details thereof in the description. Description of well-known/conventional process and techniques are omitted so as to not unnecessarily obscure the embodiments. The examples provided herein are intended merely to facilitate an understanding of ways in which the embodiments provided may be practiced and to further enable those of skilled in the art to practice the embodiments provided. Accordingly, the following examples should not be construed as limiting the scope of the embodiments.

EXAMPLES
EXAMPLE 1: Preparation of latex composition comprising bromobutyl ionomer and sodium dodecyl benzene sulfonate.
About 20 wt % solution of bromobutyl ionomer based on phosphonium ion was prepared in toluene. About 10 wt% solution of sodium dodecyl benzene sulfonate was prepared in distilled water. About 5 g of about 20 wt % solution of bromobutyl ionomer was taken in a round bottom flask and about 1g of about 10 wt% solution of sodium dodecyl benzene sulfonate was added to the flask and vigorously stirred for about 30 minutes. A white latex composition of polymer was obtained. The solid content of the latex composition was tuned through evaporation of solvents through rotavapour.

EXAMPLE 2: Preparation of latex composition comprising bromobutyl ionomer and octyl phenol ethoxylate.
About 20 wt % solution of bromobutyl ionomer based on phosphonium ion was prepared in toluene. About 10 wt% solution of octyl phenol ethoxylate was prepared in distilled water. About 5 g of about 20 wt % solution of bromobutyl ionomer was taken in a round bottom flask and about 1g of about 10 wt% solution of octyl phenol ethoxylate was added to the flask and vigorously stirred for about 30 minutes. A white latex composition of polymer was obtained. The solid content of the latex composition was tuned through evaporation of solvents through rotavapour.

EXAMPLE 3: Preparation of latex composition comprising bromobutyl ionomer and oleyl cetyl alcohol ethoxylate.
About 20 wt % solution of bromobutyl ionomer based on phosphonium ion was prepared in toluene. About 10 wt% solution of oleyl cetyl alcohol ethoxylate was prepared in distilled water. About 5 g of about 20 wt % solution of bromobutyl ionomer was taken in a round bottom flask and about 1g of about 10 wt% solution of oleyl cetyl alcohol ethoxylate was added to the flask and vigorously stirred for about 30 minutes. A white latex composition of polymer was obtained. The solid content of the latex composition was tuned through evaporation of solvents through rotavapour.

EXAMPLE 4: Preparation of latex composition comprising bromobutyl ionomer, sodium dodecyl benzene sulfonate and CI resin (Coumarone Indene Resin).
About 20 wt % solution of bromobutyl ionomer based on phosphonium ion was prepared in toluene, about 10 wt% solution of sodium dodecyl benzene sulfonate was prepared in distilled water and about 5wt% solution of CI resin was prepared in toluene. About 5 g of about 20 wt % solution of bromobutyl ionomer was taken in a round bottom flask, about 1g of about 10 wt% solution of sodium dodecyl benzene sulfonate and about 0.5g of about 5wt% solution of CI resin was added to the flask and vigorously stirred for about 30 minutes. A white latex composition of polymer was obtained. The solid content of the latex composition was tuned through evaporation of solvents through rotavapour, wherein the latex concentration was 19%.
Component Solution (wt%) Quantity(g) Solid Content (g)
Synthetic elastomeric ionomer 20 5.0 1.000
Surfactant 10 1.0 0.100
Tackifier 05 0.5 0.025

Table 1: Formulation of the Latex composition.

EXAMPLE 5 (Comparative Example): Preparation of cohesive product comprising natural rubber latex
A woven elastic cotton bandage (base material) as per British standards was employed for coating with natural rubber latex having a solid content of about 60 wt%. The natural rubber latex was applied on both surface of bandage through a spray methodology. The microparticles of natural rubber latex are uniformly distributed on the surface of the base material. The quantity of adhesive was applied with respect to about 2wt% to 10 wt% of the latex (dry weight of the latex with respect of total bandage weight) on both side of base material for the purpose of forming a cohesive, self-adhesive bandage (cohesive product).
The peel strength of the woven elastic cotton bandage has been measured to evaluate the adhesiveness. Peel test was carried out on tensile machine for a sample area of 2 in2 (width 1 inch, length 2 inch). The tensile machine crosshead speed was 40 mm/min, load cell 20 N and each sample was coated uniformly with 10 wt% of latex. The peel test of each sample was measured in 3 cycles to evaluate its multiple time adherence to bandage surface.

Sample Name Max Load (N) Peeling Force (N) Peel Strength (N/m)

SAB 1 9.34 3.56 140.2
SAB 1 Repeat Cycle 1 8.78 1.84 72.5
SAB 1 Repeat Cycle 2 7.52 1.49 58.6
SAB 1 Repeat Cycle 3 6.76 1.36 53.4
Table 2:

EXAMPLE 6: Preparation of cohesive product of the present disclosure comprising the latex composition of the present disclosure.
A woven elastic cotton bandage (base material) as per British standards was employed for coating with the latex composition. The latex composition employed comprises synthetic elastomeric ionomer and natural rubber latex in a ratio of about 1:4 ratio (wt%). The latex composition having solid content of about 50 wt% was applied on both the sides the base material through spray methodology. The microparticles of the latex composition was uniformly distributed on the surface of the base material. The quantity of adhesive was applied with respect to about 2 wt% to 10 wt% of latex (dry weight of the latex with respect of total bandage weight) on both side of base material for the purpose of forming a cohesive, self-adhesive bandage (cohesive product).

The peel strength of the woven elastic cotton bandage has been measured to evaluate the adhesiveness. Peel test was carried out on tensile machine for a sample area of 2 in2 (width 1 inch, length 2 inch). The tensile machine crosshead speed was 40 mm/min and each sample was coated uniformly with 10 wt% of latex blend. The peel test of each sample was measured in 3 cycles to evaluate its multiple time adherence to bandage surface.
Sample Name Max Load (N) Peeling Force (N) Peel Strength (N/m)

SAB 2 9.64 6.35 249.9
SAB 2 Repeat Cycle 1 8.11 1.53 60.1
SAB 2 Repeat Cycle 2 7.15 1.71 67.3
SAB 2 Repeat Cycle 3 6.85 1.56 61.4
Table 3

EXAMPLE 7:
Coating quantity of dry sample was determined by the difference of the weights of the coated and the uncoated base material. To evaluate this, the weight of base material has been noted before and after applying the latex composition through spray coating technique in order to determine the weight % of latex on the base material to optimize the latex quantity so that self-adhesive material can be prepared with sufficient breathability.

Sl. No. Sample Wt. without Latex in g (a) Wt. with Latex in g (b) ?=b-a Latex %
1 Sample 1 10.5 11.0 0.5 4.5
2 Sample 2 10.7 11.3 0.6 5.3
2 Sample 3 10.2 11.2 1.0 8.9

Table 4. From this example it is determined that the latex percent on the surface of the base material should not be more than 10% for obtaining improved breathability for the cohesive product.