Recyclable release liner and composite composition for preparing the same

Abstract

A repulpable release liner and a composite composition for preparing the same are disclosed. The composite composition includes (A) a first formulation containing a vinyl-functionalized polysiloxane, a non-vinyl polysiloxane, and a noble metal-siloxane complex catalyst, and (B) a second formulation containing at least one olefin copolymer and at least one olefin-(meth)acrylic copolymer. The first formulation is independent of the second formulation. The release liner prepared using the composite composition exhibits excellent repulpability, abrasion resistance, coatability of a release coating having a desired release force, and the like.

Description

Technical Field

[0001] The present disclosure relates to a unique repulpable release liner and a composite composition for preparing the same. The release liner and the composite composition are designed to achieve excellent performance characteristics, such as the repulpability of the release liner, abrasion resistance, and coatability of a release coating having a desired release force.

Background Art

[0002] Release liners are widely used in various commercial products that require temporary protection and delamination immediately before use, such as adhesive tapes, gummed labels, protective films, packaging materials, and containers. Release liners enable convenient transportation, storage, and use of products, but there are still several problems in this field. Exemplary polyolefin-coated paper release liners are typically made from high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP) plastic resins. Another example is polyolefin-coated kraft paper, which is typically machine-finished kraft (MFK) paper and can be coated on one or both sides to be very smooth, moisture-resistant, and dimensionally stable. Due to the presence of polyolefin extrusion coatings, not all of these release liners can be repulped. Therefore, one of the main problems is that the use of these commercial products generates a large amount of waste, especially peeled release liners, which poses a serious burden in terms of technology, economy, and environmental protection. Thus, it is highly desirable to completely and effectively repulp the waste. Although some solutions have been reported in the prior art, they invariably compromise one or more additional performance characteristics such as adhesion strength, peelability, abrasion resistance, and mechanical strength. Therefore, there has still been a long-standing need for a unique repulpable release liner that can be easily and completely repulped without causing deterioration of any other performance characteristics such as those described above.

[0003] After continuous investigations, the inventors have surprisingly developed a unique repulpable release liner and a composite composition for preparing the same that can achieve the above objectives.

Summary of the Invention

[0004] The present disclosure provides a unique repulpable release liner and a composite composition for preparing the same.

[0005] In a first aspect of the present disclosure, the present disclosure is a composite composition for preparing a repulpable release liner, comprising: (A) a first formulation comprising a vinyl-functionalized polysiloxane, a non-vinyl polysiloxane, and a noble metal-siloxane complex catalyst; and (B) a second formulation comprising at least one olefin (co)polymer and at least one olefin-(meth)acrylic copolymer, wherein the first formulation is independent of the second formulation. According to an embodiment of the present disclosure, the first formulation is used to prepare the release layer of the repulpable release liner, and the second formulation is used to prepare the intermediate layer sandwiched between the release layer and the backing layer. According to another embodiment of the present disclosure, the first formulation is solvent-free.

[0006] In a second aspect of the present disclosure, the present disclosure is a repulpable release liner prepared using the composite composition of the present disclosure, comprising: (I) a release layer formed using the first formulation; (II) an intermediate layer formed using the second formulation; and (III) a backing layer that can be a backing paper layer.

[0007] Other features and aspects of the present disclosure will be discussed in more detail below. It should be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the claimed invention.

Brief Description of the Drawings

[0008] For the purpose of illustrating the present invention, exemplary embodiments are shown in the drawings. However, it is to be understood that the present disclosure is not limited to the specific configurations shown.

Figure 1

Figure 2

Figure 3

DETAILED DESCRIPTION OF THE INVENTION

[0009] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Also, all publications, patent applications, patents, and other references mentioned herein are incorporated by reference.

[0010] As used herein when disclosed, "and / or" means "and, or alternatively". All ranges include the endpoints unless otherwise indicated. The terms "polysiloxane" and "siloxane" are interchangeable and refer to molecules having multiple Si-O-Si bonds. The term "(meth)acrylic" refers to acrylic or methacrylic, "(meth)acrylic acid" refers to acrylic acid or methacrylic acid, "(meth)acrylate" refers to acrylate or methacrylate, and "(meth)acrylamide" refers to acrylamide or methacrylamide.

[0011] While not limited to any particular theory, the technical breakthrough of the present disclosure lies mainly in a combination of formulations specially designed for the release layer and the intermediate layer of the release liner. In particular, it has been found that a release liner exhibiting excellent performance characteristics such as repulpability, abrasion resistance, curing ability, and mechanical strength (e.g., tensile strength, elongation at break, adhesion strength between the release layer and the backing layer, etc.) can be produced from a combination of (A) a first formulation for the release layer and (B) a second formulation for the intermediate layer.

[0012] It has also been found that in order to achieve further improvement in the performance characteristics of the release liner, the category and relative content of the components used in each of the above-mentioned components may be further changed.

[0013] Formulation (A) Formulation (A) contains a vinyl-functionalized polysiloxane, a, and one noble metal-siloxane complex catalyst.

[0014] According to an embodiment of the present disclosure, the vinyl-functionalized polysiloxane for formulation (A) is a polysiloxane containing at least one vinyl group per molecule. Specifically, the vinyl-functionalized polysiloxane may contain at least one ViSiO 3 / 2 , ViR 1 SiO 2 / 2 , or Vi(R 2 ) 2 SiO 1 / 2 units, and further may contain at least one unit selected from the group consisting of SiO 4 / 2 , R 3 SiO 3 / 2 , (R 4 ) 2 SiO 2 / 2 , (R 5 ) 3 SiO 1 / 2 , and any combination thereof, wherein Vi represents a vinyl group (-CH=CH 2 ), and R 1 , R 2 , R 3 , R 4 , and R 5Each of them is independently H, C 1 -C 16 an alkyl group, and C 1 -C 16 an alkoxy group, and is selected from the group consisting of combinations thereof. According to an exemplary embodiment, R 1 , R 2 , R 3 , R 4 , and R 5 are each independently C such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, etc 1 -C 6 an alkyl group, or C such as methoxy, ethoxy, propoxy, butoxy, etc 1 -C 6 an alkoxy group.

[0015] According to embodiments of the present disclosure, the vinyl-functionalized polysiloxane contains 0.05 to 8 wt%, such as 0.1 to 6 wt%, or 0.2 to 5 wt%, or 0.3 to 3 wt%, or 0.35 to 2 wt%, or 0.4 to 1 wt%, or 0.5 to 0.8 wt%, or 0.6 to 0.7 wt% of vinyl groups based on the total weight of the vinyl-functionalized polysiloxane. For example, the vinyl content can be within a numerical range obtained by combining any two of the following two endpoint values: 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%, 0.5 wt%, 0.55 wt%, 0.6 wt%, 0.65 wt%, 0.7 wt%, 0.75 wt%, 0.8 wt%, 0.85 wt%, 0.9 wt%, 0.95 wt%, 1 wt%, 1.2 wt%, 1.5 wt%, 1.8 wt%, 2 wt%, 2.2 wt%, 2.5 wt%, 2.8 wt%, 3 wt%, 3.2 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.5 wt%, 4.8 wt%, 5 wt%, 5.2 wt%, 5.5 wt%, 5.8 wt%, 6 wt%, 6.2 wt%, 6.5 wt%, 6.8 wt%, 7 wt%, 7.2 wt%, 7.5 wt%, 7.8 wt%, 8 wt%.

[0016] As is generally known in the technical field of polysiloxanes, since each of the oxygen atoms is actually shared by two silicon atoms, the oxygen atoms have subscripts such as "1 / 2", "2 / 2", "3 / 2", and "4 / 2". For example, "Vi(R 2 ) 2 SiO 1 / 2 " represents a unit having the formula:

[0017]

Chemical formula

[0018] According to an exemplary embodiment of the present disclosure, the vinyl-functionalized polysiloxane contains 0.01 to 25% by weight, for example 0.1 to 22% by weight, or 0.5 to 20% by weight, or 1 to 18% by weight, or 1.5 to 15% by weight, or 2 to 12% by weight, or 2.2 to 10% by weight, or 2.5 to 5% by weight of Vi(R 2 ) 2 SiO 1 / 2 units, based on the total weight of the vinyl-functionalized polysiloxane. For example, Vi(R 2 ) 2 SiO 1 / 2The content of the unit is within a numerical range obtained by combining any two of the following two endpoint values: 0.01 wt%, 0.05 wt%, 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%, 0.5 wt%, 0.55 wt%, 0.6 wt%, 0.65 wt%, 0.7 wt%, 0.75 wt%, 0.8 wt%, 0.85 wt%, 0.9 wt%, 0.95 wt%, 1 wt%, 1.2 wt%, 1.5 wt%, 1.8 wt%, 2 wt%, 2.2 wt%, 2.5 wt%, 2.8 wt%, 3 wt%, 3.2 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.5 wt%, 4.8 wt%, 5 wt%, 5.2 wt%, 5.5 wt%, 5.8 wt%, 6 wt%, 6.2 wt%, 6.5 wt%, 6.8 wt%, 7 wt%, 7.2 wt%, 7.5 wt%, 7.8 wt%, 8 wt%, 10 wt%, 12 wt%, 15 wt%, 18 wt%, 20 wt%, 22 wt%, 25 wt%.

[0019] According to an exemplary embodiment of the present disclosure, the vinyl-functionalized polysiloxane contains 0.01 to 20 wt%, for example 0.1 to 18 wt%, or 0.5 to 16 wt%, or 1 to 15 wt%, or 1.5 to 12 wt%, or 2 to 10 wt%, or 2.2 to 8 wt%, or 2.5 to 5 wt% of ViSiO based on the total weight of the vinyl-functionalized polysiloxane 3 / 2 and, for example, ViSiO 3 / 2The content of the unit can be within the numerical range obtained by combining any two of the following two endpoint values: 0.01 wt%, 0.05 wt%, 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%, 0.5 wt%, 0.55 wt%, 0.6 wt%, 0.65 wt%, 0.7 wt%, 0.75 wt%, 0.8 wt%, 0.85 wt%, 0.9 wt%, 0.95 wt%, 1 wt%, 1.2 wt%, 1.5 wt%, 1.8 wt%, 2 wt%, 2.2 wt%, 2.5 wt%, 2.8 wt%, 3 wt%, 3.2 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.5 wt%, 4.8 wt%, 5 wt%, 5.2 wt%, 5.5 wt%, 5.8 wt%, 6 wt%, 6.2 wt%, 6.5 wt%, 6.8 wt%, 7 wt%, 7.2 wt%, 7.5 wt%, 7.8 wt%, 8 wt%, 10 wt%, 12 wt%, 15 wt%, 18 wt%, 20 wt%.

[0020] According to an exemplary embodiment of the present disclosure, the vinyl-functionalized polysiloxane is 0.01 to 20 wt%, such as 0.1 to 18 wt%, or 0.5 to 16 wt%, or 1 to 15 wt%, or 1.5 to 12 wt%, or 2 to 10 wt%, or 2.2 to 8 wt%, or 2.5 to 5 wt% of ViR based on the total weight of the vinyl-functionalized polysiloxane 1 SiO 2 / 2 including, for example, ViR 1 SiO 2 / 2The content of the unit can be within the numerical range obtained by combining any two of the following two endpoint values: 0.01 wt%, 0.05 wt%, 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%, 0.5 wt%, 0.55 wt%, 0.6 wt%, 0.65 wt%, 0.7 wt%, 0.75 wt%, 0.8 wt%, 0.85 wt%, 0.9 wt%, 0.95 wt%, 1 wt%, 1.2 wt%, 1.5 wt%, 1.8 wt%, 2 wt%, 2.2 wt%, 2.5 wt%, 2.8 wt%, 3 wt%, 3.2 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.5 wt%, 4.8 wt%, 5 wt%, 5.2 wt%, 5.5 wt%, 5.8 wt%, 6 wt%, 6.2 wt%, 6.5 wt%, 6.8 wt%, 7 wt%, 7.2 wt%, 7.5 wt%, 7.8 wt%, 8 wt%, 10 wt%, 12 wt%, 15 wt%, 18 wt%, 20 wt%.

[0021] According to another embodiment of the present disclosure, SiO 4 / 2 , R 3 SiO 3 / 2 , (R 4 ) 2 SiO 2 / 2 , and R 5 SiO 1 / 2 each may have a content of, for example, 0 wt% to 100 wt%, or 2 to 95 wt%, or 5 to 90 wt%, or 8 to 85 wt%, or 10 to 80 wt%, or 15 to 75 wt%, or 20 to 70 wt%, or 25 to 65 wt%, or 30 to 60 wt%, or 35 to 55 wt%, or 40 to 50 wt%, or 45 to 48 wt% based on the total weight of the vinyl-functionalized polysiloxane.

[0022] According to an exemplary embodiment of the present disclosure, the vinyl-functionalized polysiloxane has the general formula (1): [Vi(R 2 ) 2 SiO 1 / 2 m -(SiO 4 / 2 ) n -(R 3 SiO 3 / 2 )​p -[(R 4 ) 2 SiO 2 / 2 q -[(R 5 ) 3 SiO 1 / 2 r Formula (1) (wherein each of the subscripts m, n, p, q, and r is independently an integer from 0 to 500, for example, an integer from 1 to 400 or from 2 to 300, or one of the following two endpoint values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 22, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 220, 250, 300, 350, 400, 450, 500, and can be represented by combining any two of them. For example, the subscript m can be an integer from 1 to 100, and each of the subscripts n, p, q, and r is independently an integer from 0 to 500, and 3 ≤ n + p + q + r ≤ 2000). According to another embodiment, R 1 , R 2 , R 3 , R 4 , and R 5 are all not hydrogen.

[0023] According to another embodiment of the present disclosure, the vinyl-functionalized polysiloxane has the general formula (2): (ViMe 2 SiO 1 / 2 ) m -(SiO 4 / 2 ) n -(Me 3 SiO 3 / 2 ) p -[Me 2 SiO 2 / 2 q -[Me 3 SiO 1 / 2 r Formula (2) (wherein each of the subscripts m, n, p, q, and r is as defined above).

[0024] ​​​​ According to embodiments of the present disclosure, the vinyl-functionalized polysiloxane has a viscosity within a numerical range obtained by combining any two of the following: about 80 to 2000 mPa·s, such as 100 to 1500 mPa·s, or 120 to 1200 mPa·s, or 150 to 1000 mPa·s, or 200 to 800 mPa·s, or 220 to 600 mPa·s, or 250 to 400 mPa·s, or 280 to 350 mPa·s, or the following two end values: 80 mPa·s, 100 mPa·s, 120 mPa·s, 150 mPa·s, 180 mPa·s, 200 mPa·s, 220 mPa·s, 250 mPa·s, 280 mPa·s, 300 mPa·s, 320 mPa·s, 350 mPa·s, 380 mPa·s, 400 mPa·s, 420 mPa·s, 450 mPa·s, 500 mPa·s, 550 mPa·s, 600 mPa·s, 650 mPa·s, 700 mPa·s, 750 mPa·s, 800 mPa·s, 850 mPa·s, 900 mPa·s, 950 mPa·s, 1000 mPa·s, 1050 mPa·s, 1100 mPa·s, 1150 mPa·s, 1200 mPa·s, 1250 mPa·s, 1300 mPa·s, 1350 mPa·s, 1400 mPa·s, 1450 mPa·s, 1500 mPa·s, 1550 mPa·s, 1600 mPa·s, 1650 mPa·s, 1700 mPa·s, 1750 mPa·s, 1800 mPa·s, 1850 mPa·s, 1900 mPa·s, 1950 mPa·s, 2000 mPa·s at 25°C.

[0025] As used herein, all viscosities are reported in millipascal seconds (mPa·s) unless otherwise noted. * When determining the low-shear viscosity, it is measured at a rate of 0.1 rotation per minute (shear rate of 0.2 s), -1 and when determining the high-shear viscosity, it is measured at a rate of 10 rotations per minute (shear rate of 20 s) -1 using a cone plate rheometer equipped with a CP#52 spindle.

[0026] According to an embodiment of the present disclosure, the content of the vinyl-functionalized polysiloxane is 80% to 99% by weight, for example, 82 to 98.5% by weight, or 85 to 98% by weight, or 87 to 97.5% by weight, or 88 to 97% by weight, or 90 to 96.5% by weight, or 92 to 96% by weight, or any numerical range obtained by combining any two of the following two endpoint values: 80% by weight, 82% by weight, 85% by weight, 88% by weight, 90% by weight, 92% by weight, 93% by weight, 94% by weight, 95% by weight, 96% by weight, 97% by weight, 98% by weight, 99% by weight, based on the total weight of the first formulation.

[0027] According to an embodiment of the present disclosure, the non-vinyl polysiloxane has the general formula (3): [(R 6 ) 3 SiO 1 / 2 a -(SiO 4 / 2 ) b -(R 7 SiO 3 / 2 ) c -[(R 8 ) 2 SiO 2 / 2 d Formula (3) (wherein each of R 6 , R 7 , and R 8 is independently selected from the group consisting of H, C 1 -C 16 alkyl groups, and C 1 -C 16 alkoxy groups, and combinations thereof. According to an exemplary embodiment, each of R 6 , R 7 , and R 8 is independently a C 1 -C 6 alkyl group such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, or a C 1 -C 6 ​​an alkoxy group, and each of the subscripts a, b, c, and d is independently an integer from 0 to 300, for example, an integer from 1 to 200 or from 2 to 280, or one of the following two end values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 22, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 220, 250, 300, and is within a numerical range obtained by combining any two of them. For example, subscript a can be an integer from 1 to 100 or from 2 to 50, and each of subscripts b, c, and d is independently an integer from 0 to 200, and 3 ≤ a + b + c + d ≤ 800), and can be represented by. According to an embodiment, the non-vinyl polysiloxane is terminated with the unit of “(R 6 ) 3 SiO 1 / 2 ”.

[0028] According to another embodiment of the present disclosure, the non-vinyl polysiloxane has the formula (4): [(Me) 3 SiO 1 / 2 a -(SiO 4 / 2 ) b -(MeSiO 3 / 2 ) c -[(Me) 2 SiO 2 / 2 d Formula (4) (wherein each of the subscripts a, b, c, and d is as defined above) is represented by.

[0029] ​​According to an embodiment of the present disclosure, the non-vinyl polysiloxane has a viscosity within a numerical range obtained by combining any two of the following: about 5 to 100 mPa·s at 25°C, for example, 8 to 90 mPa·s, or 10 to 85 mPa·s, or 12 to 80 mPa·s, or 15 to 70 mPa·s, or 16 to 60 mPa·s, or 17 to 50 mPa·s, or 18 to 40 mPa·s, or 20 to 30 mPa·s, or the following two end values: 5 mPa·s, 8 mPa·s, 10 mPa·s, 12 mPa·s, 15 mPa·s, 20 mPa·s, 25 mPa·s, 30 mPa·s, 35 mPa·s, 40 mPa·s, 45 mPa·s, 50 mPa·s, 55 mPa·s, 60 mPa·s, 65 mPa·s, 70 mPa·s, 75 mPa·s, 80 mPa·s, 90 mPa·s, 95 mPa·s, 100 mPa·s.

[0030] According to an embodiment of the present disclosure, the content of the non-vinyl polysiloxane can be within a numerical range obtained by combining any two of the following: 0.05 wt% to 10 wt% based on the total weight of the first formulation, for example, 0.1 to 8 wt%, or 0.5 to 7 wt%, or 0.8 to 6 wt%, or 1 to 5 wt%, or 1.2 to 4 wt%, or 1.5 to 3 wt%, or 2.5 to 3 wt%, or the following two end values: 0.05 wt%, 0.08 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, 2 wt%, 2.1 wt%, 2.2 wt%, 2.3 wt%, 2.5 wt%, 2.6 wt%, 2.7 wt%, 2.8 wt%, 2.9 wt%, 3 wt%, 3.2 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.5 wt%, 4.8 wt%, 5 wt%, 5.2 wt%, 5.5 wt%, 5.8 wt%, 6 wt%, 6.2 wt%, 6.5 wt%, 6.8 wt%, 7 wt%, 7.2 wt%, 7.5 wt%, 7.8 wt%, 8 wt%, 8.2 wt%, 8.5 wt%, 8.8 wt%, 9 wt%, 9.2 wt%, 9.5 wt%, 9.8 wt%, 10 wt%.

[0031] According to an embodiment of the present disclosure, the noble metal-siloxane complex catalyst comprises or consists of at least one noble metal and a siloxane ligand, and the noble metal can be selected from the group consisting of Pt, Pd, Ru, Rh, Os, Ir, Ag, their alloys and mixtures, and the siloxane ligand is hydrogen, C 1 -C 16 alkyl, C 1 -C 16 alkoxy, C 2 -C 16 alkenyl, etc., and can be a monosiloxane, disiloxane, trisiloxane, or tetrasiloxane optionally containing one or more substituents. For example, the siloxane ligand can be divinyl-tetramethyldisiloxane, especially 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, etc., containing more than one C 2 -C 16 alkenyl (e.g., vinyl) and more than one C 1 -C 16 alkyl.

[0032] According to another embodiment of the present disclosure, the noble metal-siloxane complex catalyst can be used in the form of a dispersion containing the above noble metal-siloxane complex catalyst dispersed in a polysiloxane dispersant, and the polysiloxane dispersant has the formula (5): [Vi(R 9 ) 2 SiO 1 / 2 A -(SiO 4 / 2 ) B -(R 10 SiO 3 / 2 ) C -[(R 11 ) 2 SiO 2 / 2 D -[(R 12 ) 3 SiO 1 / 2 E Formula (5) (wherein each of R 9 , R 10 , R 11 , and R 12 is independently H, C​​​1 -C 16 an alkyl group, and C 1 -C 16 selected from the group consisting of an alkoxy group and combinations thereof. According to an exemplary embodiment, R 9 , R 10 , R 11 , and R 12 each can be independently represented by a C 1 -C 6 alkyl group such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, etc., or a C 1 -C 6 alkoxy group such as methoxy, ethoxy, propoxy, butoxy, etc.). According to another embodiment, R 9 , R 10 , R 11 , and R 12 are all not hydrogen, and each of the subscripts A, B, C, D, and E is independently an integer from 0 to 500, such as an integer from 1 to 400 or 2 to 300, or any numerical range obtained by combining any two of the following two endpoint values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 22, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 220, 250, 300, 350, 400, 450, 500. For example, subscript A can be an integer from 1 to 100, and each of subscripts B, C, D, and E is independently an integer from 0 to 500, and 3 ≤ B + C + D + E ≤ 2000.

[0033] According to another embodiment of the present disclosure, the polysiloxane dispersant has the formula (6): [ViMeSiO 1 / 2 A -(SiO 4 / 2 ) B -(MeSiO 3 / 2 ) C -[Me 2 SiO 2 / 2 D -[Me 3 SiO​​1 / 2 E Formula (6) (where each of the subscripted characters A, B, C, D, and E is as defined above) is represented by

[0034] ​According to another embodiment of the present disclosure, the dispersion contains the above-mentioned noble metal-siloxane complex catalyst and polysiloxane dispersant, and the content of the noble metal-siloxane complex catalyst is 0.01 wt% to 15 wt%, for example 0.1 to 12 wt%, or 0.5 to 10 wt%, or 0.8 to 8 wt%, or 1 to 7 wt%, or 1.2 to 6 wt%, or 1.3 to 5 wt%, or 1.5 to 3 wt%, or any two of the following endpoint values: 0.01 wt%, 0.02 wt%, 0.05 wt%, 0.08 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, 2 wt%, 2.1 wt%, 2.2 wt%, 2.3 wt%, 2.5 wt%, 2.6 wt%, 2.7 wt%, 2.8 wt%, 2.9 wt%, 3 wt%, 3.2 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.5 wt%, 4.8 wt%, 5 wt%, 5.2 wt%, 5.5 wt%, 5.8 wt%, 6 wt%, 6.2 wt%, 6.5 wt%, 6.8 wt%, 7 wt%, 7.2 wt%, 7.5 wt%, 7.8 wt%, 8 wt%, 8.2 wt%, 8.5 wt%, 8.8 wt%, 9 wt%, 9.2 wt%, 9.5 wt%, 9.8 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, and can be within the numerical range obtained by combining any two of them.According to an embodiment of the present disclosure, the dispersion of the catalyst has a viscosity within a numerical range obtained by combining any two of the following values: about 100 to 3000 mPa·s at 25°C, such as 150 to 2500 mPa·s, or 180 to 2200 mPa·s, or 200 to 2000 mPa·s, or 220 to 1800 mPa·s, or 250 to 1500 mPa·s, or 280 to 1200 mPa·s, or 300 to 1000 mPa·s, or 400 to 500 mPa·s, or the following two end values: 100 mPa·s, 120 mPa·s, 150 mPa·s, 180 mPa·s, 200 mPa·s, 220 mPa·s, 250 mPa·s, 280 mPa·s, 300 mPa·s, 320 mPa·s, 350 mPa·s, 380 mPa·s, 400 mPa·s, 420 mPa·s, 450 mPa·s, 500 mPa·s, 550 mPa·s, 600 mPa·s, 650 mPa·s, 700 mPa·s, 750 mPa·s, 800 mPa·s, 850 mPa·s, 900 mPa·s, 950 mPa·s, 1000 mPa·s, 1050 mPa·s, 1100 mPa·s, 1150 mPa·s, 1200 mPa·s, 1250 mPa·s, 1300 mPa·s, 1350 mPa·s, 1400 mPa·s, 1450 mPa·s, 1500 mPa·s, 1550 mPa·s, 1600 mPa·s, 1650 mPa·s, 1700 mPa·s, 1750 mPa·s, 1800 mPa·s, 1850 mPa·s, 1900 mPa·s, 1950 mPa·s, 2000 mPa·s, 2200 mPa·s, 2500 mPa·s, 2800 mPa·s, 3000 mPa·s.

[0035] According to another embodiment of the present disclosure, the amount of the above (catalyst) dispersion is 0.05 wt% to 10 wt%, for example, 0.1 to 8 wt%, or 0.5 to 7 wt%, or 0.8 to 6 wt%, or 1 to 5 wt%, or 1.2 to 4 wt%, or 1.5 to 3 wt%, or any two of the following endpoint values: 0.05 wt%, 0.08 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, 2 wt%, 2.1 wt%, 2.2 wt%, 2.3 wt%, 2.5 wt%, 2.6 wt%, 2.7 wt%, 2.8 wt%, 2.9 wt%, 3 wt%, 3.2 wt%, 3.5 wt%, 3.8 wt%, 4 wt%, 4.2 wt%, 4.5 wt%, 4.8 wt%, 5 wt%, 5.2 wt%, 5.5 wt%, 5.8 wt%, 6 wt%, 6.2 wt%, 6.5 wt%, 6.8 wt%, 7 wt%, 7.2 wt%, 7.5 wt%, 7.8 wt%, 8 wt%, 8.2 wt%, 8.5 wt%, 8.8 wt%, 9 wt%, 9.2 wt%, 9.5 wt%, 9.8 wt%, 10 wt%, and can be within the numerical range obtained by combining any two of them.

[0036] According to another embodiment of the present disclosure, the first formulation is solvent-free. As used herein, the term "solvent-free" means that solvents such as water and any ordinary organic solvents (e.g., alkanes, halogenated hydrocarbons, ethers, alcohols, esters, aromatic hydrocarbons, ketones, tetrahydrofuran, dimethylformamide, N-methylpyrrolidone, carbon disulfide, etc.) are not intentionally incorporated therein, and formulations containing trace amounts of these solvents as inevitable impurities (e.g., impurities contained in raw materials) are also considered solvent-free. For example, the solvent-free first formulation may have a solvent content of less than 1% by weight, e.g., less than 0.9% by weight, or less than 0.8% by weight, or less than 0.7% by weight, or less than 0.6% by weight, or less than 0.5% by weight, or less than 0.4% by weight, or less than 0.3% by weight, or less than 0.25% by weight, or less than 0.2% by weight, based on the total weight of the first formulation. According to an embodiment of the present disclosure, the vinyl-functionalized polysiloxane, non-vinyl polysiloxane, and one noble metal-siloxane complex catalyst (and the above-mentioned dispersion containing the noble metal-siloxane complex catalyst) are solvent-free.

[0037] The first formulation may optionally contain one or more conventional additives such as fillers, pigments, film-forming agents, thickeners, anti-settling aids, curing agents, film-forming aids, lubricants, flame retardants, light stabilizers, heat stabilizers, biocides, plasticizers, waxes, or antioxidants.

[0038] Formulation (B) Formulation (B) is an aqueous dispersion containing at least one olefin (co)polymer and at least one olefin-(meth)acrylic copolymer.

[0039] The olefin (co)polymer may be a homopolymer of C 2 -C 16 alkene, a copolymer of two or more C 2 -C 16 alkenes, or a copolymer of at least one C 2 -C 16 alkene and at least one vinyl comonomer other than olefins. For example, the olefin (co)polymer may be a copolymer of ethylene and one or more C3 -C 16 It can be a copolymer with α-alkenes such as 1-propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, butadiene, styrene, etc. Such ethylene-(C 3 -C 16 )α-alkene copolymer, the molar ratio of ethylene to (C 3 -C 16 )α-alkene can be within the numerical range obtained by combining any two of 99:1 to 1:99, for example, the following two end values: 95:1, 90:1, 85:1, 80:1, 75:1, 70:1, 65:1, 60:1, 55:1, 50:1, 45:1, 40:1, 35:1, 30:1, 25:1, 20:1, 15:1, 10:1, 5:1, 3:1, 2:1, 1:1, 1:2, 1:3, 1:5, 1:10, 1:15, 1:20, 1:25, 1:30, 1:35, 1:40, 1:45, 1:50, 1:55, 1:60, 1:65, 1:70, 1:80, 1:90. The olefin (co)polymer can have a melt flow rate (MFR) in the range of 0.1 to 50 g / 10 min, for example 0.1 to 50, or 0.2 to 45, or 0.5 to 45, or 0.5 to 40, or 0.5 to 35, or 0.8 to 35, or 1 to 35, or 2 to 35, measured according to ASTM D-1238 (at 190 °C / 2.16 Kg). The content of the olefin (co)polymer can be 10 to 50% by weight based on the total weight of formulation (B), for example, 15 to 45% by weight, or 20 to 40% by weight, or 25 to 35% by weight, or 28 to 32% by weight, for example within the numerical range obtained by combining any two of the following two end values: 10% by weight, 12% by weight, 14% by weight, 15% by weight, 18% by weight, 20% by weight, 22% by weight, 25% by weight, 28% by weight, 30% by weight, 32% by weight, 34% by weight, 35% by weight, 38% by weight, 40% by weight, 42% by weight, 45% by weight, 48% by weight, 50% by weight.

[0040] The olefin-(meth)acrylic copolymer contains at least one C 2 -C 16It may be a copolymer of an alkene and at least one (meth)acrylic monomer, C 2 -C 16 The alkene is C such as ethylene, propylene, butene, pentene, hexene, heptene, octene, nonene, or styrene 2 -C 12 The alkene or C 2 -C 6 It may contain an alkene, and the (meth)acrylic monomer is methacrylic acid, acrylic acid, methacrylamide, acrylamide, methacrylonitrile, acrylonitrile, (C 1 -C 12 ) alkyl methacrylate (for example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate, etc.), (C 1 -C 12)It may contain alkyl acrylates (e.g., methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, etc.) and any combination thereof. The molar ratio between the olefin and the (meth)acrylic monomer can be within the numerical range obtained by combining any two of 99:1 to 1:99, for example, the following two endpoint values: 95:1, 90:1, 85:1, 80:1, 75:1, 70:1, 65:1, 60:1, 55:1, 50:1, 45:1, 40:1, 35:1, 30:1, 25:1, 20:1, 15:1, 10:1, 5:1, 3:1, 2:1, 1:1, 1:2, 1:3, 1:5, 1:10, 1:15, 1:20, 1:25, 1:30, 1:35, 1:40, 1:45, 1:50, 1:55, 1:60, 1:65, 1:70, 1:80, 1:90. The olefin-(meth)acrylic copolymer can have a melt flow rate (MFR) in the range of 0.1 to 50 g / 10 min, for example 0.1 to 50, or 0.2 to 45, or 0.5 to 45, or 0.5 to 40, or 0.5 to 35, or 0.8 to 35, or 1 to 35, or 2 to 35, as measured according to ASTM D-1238 (at 190 °C / 2.16 Kg). The content of the olefin-(meth)acrylic copolymer can be 2 to 30% by weight, for example 5 to 28% by weight, or 8 to 25% by weight, or 10 to 20% by weight, or 12 to 15% by weight, based on the total weight of formulation (B). For example, within the numerical range obtained by combining any two of the following two endpoint values: 2% by weight, 3% by weight, 4% by weight, 5% by weight, 6% by weight, 7% by weight, 8% by weight, 9% by weight, 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight, 15% by weight, 16% by weight, 17% by weight, 18% by weight, 20% by weight, 22% by weight, 25% by weight, 28% by weight, 30% by weight.

[0041] Formulation (B) may contain one or more conventional additives such as surfactants, emulsifiers, fillers, film-forming agents, colorants, pigments, thickeners, anti-settling aids, curing agents, film-forming aids, biocides, plasticizers, waxes, anti-aging agents, or antioxidants.

[0042] Furthermore, in addition to the above components, Formulation (B) may contain water, e.g., water content, in an amount of about 30% to 75% by weight, or 40% to 65% by weight, or 45% to 60% by weight, or 50% to 58% by weight, based on the total weight of Formulation (B), for example, any numerical range obtained by combining any two of the following two endpoint values: 30% by weight, 32% by weight, 35% by weight, 38% by weight, 40% by weight, 42% by weight, 45% by weight, 48% by weight, 50% by weight, 52% by weight, 55% by weight, 58% by weight, 60% by weight, 62% by weight, 65% by weight, 68% by weight, 70% by weight, 72% by weight, 75% by weight.

[0043] The Formulations (A) and (B) shown above can be used independently to form separate components of the release liner of the present disclosure. FIG. 1 shows a cross-section of an exemplary release liner including, from bottom to top, a backing layer, an intermediate layer, and a release layer, where the intermediate layer is formed of Formulation (B) and the release layer is formed of Formulation (A).

[0044] According to an embodiment of the present disclosure, the backing layer can be made of a material selected from the group consisting of paper, e.g., kraft paper, coated kraft paper, pressure-sensitive paper, cellophane, coated cellophane, rubberized paper, recycled paper, etc.; degradable polymers or natural materials, e.g., polylactic acid, polybutylene succinate / caproate, polyhydroxybutyrate / valerate, polyvinyl succinate, polycaprolactone, starch, modified cellulose; and any combination thereof. According to another embodiment, the backing layer can be made of kraft paper. According to a preferred embodiment of the present disclosure, the backing layer is not made of a non-repulpable material. For example, polyethylene-coated kraft (PEK) paper, which is generally used as a backing layer or a release liner after silicone treatment of the PE-coated surface in various adhesive tape or label products, cannot achieve the desired repulpability and is therefore not suitable for the backing layer of the present disclosure.

[0045] According to embodiments of the present disclosure, the backing layer is repulpable. As used herein, the term "repulpable" or "repulpability" means that an object, under normal pulping (disintegration) conditions (e.g., treatment in an agitated warm aqueous solution under a specific pH), can be sufficiently decomposed and disintegrated to minimize the content of large remaining fragments and pieces (e.g., those having a size greater than 0.01 inch or about 0.254 mm) to a level of, for example, less than 14 wt%, or less than 12 wt%, or less than 10 wt%, or less than 8 wt%, or less than 6 wt% based on the original weight (solid content weight) of the object before the repulping process. According to embodiments of the present disclosure, all of the release layer, the intermediate layer, and the backing layer are repulpable. According to another embodiment of the present disclosure, the entire release liner is repulpable.

[0046] As shown in FIG. 1, the release liner can be prepared by applying formulation (B) on one or both sides of the backing layer by any suitable coating technique such as gravure coating, roll coating, bar coating, knife coating, cast coating, spray coating, dip coating, die coating, blade coating, printing, etc., and the coating weight of this layer can be about 1 - 30 g / m 2 , for example, 2 - 20 g / m 2 , or 2 - 10 g / m 2 , or 2 - 5 g / m 2 . Then, the coated layer can be cured at a temperature of ambient temperature to 200°C, for example, 50 - 180°C, or 60 - 160°C, or 80 - 150°C, or 90 - 130°C, or 100 - 130°C. After the curing and drying of the intermediate layer, all components of formulation (A) are combined to form a blend (e.g., a paste), and this blend is coated on the outer surface of the intermediate layer by any of the above coating techniques to form a release layer on the surface of the intermediate layer. The coating weight of the release layer (wet) can be about 0.5 - 20 g / m 2 , for example, 0.5 - 15 g / m 2 , or 0.5 - 10 g / m 2、 or 0.8 to 10 g / m 2 It can be. Next, the coated release layer can be cured at a temperature of ambient temperature to 200 ° C, for example, 50 to 180 ° C, or 60 to 170 ° C, or 80 to 160 ° C, or 100 to 150 ° C, or 120 to 150 ° C.

[0047] The release liner can be sliced into various sizes and used for various applications such as a separation piece of an adhesive sheet or a continuous adhesive tape. FIG. 2 shows a schematic view of a continuous adhesive tape in the form of a roll in which a laminate formed by a release liner and an adhesive layer is wound in a roll shape. The adhesive tape roll can be unwound for a specific application, and the release liner can be easily peeled off before or after adhering the adhesive layer onto the surface of an object. The peeled release liner has excellent repulpability and can be easily repulped and recycled.

[0048] FIG. 3 shows a label or tape including an adhesive layer sandwiched between the release liner of the present invention and a carrier layer. The adhesive strength between the carrier layer and the adhesive layer is much higher, and these two layers are applied as a whole onto the surface of an object while the release liner is pre-peeled and repulped. The carrier layer may have a printed image, character, or symbol.

Examples

[0049] Next, some embodiments of the present invention will be described in the following examples. All parts and percentages are by weight unless otherwise specified. However, the scope of the present disclosure is of course not limited to the formulations shown in these examples. Rather, the examples are merely the invention of the present disclosure.

[0050] The information of the raw materials used in the examples is listed in Table 1 below.

[0051]

Table 1

[0052] Example 1 In this example, a 297 mm × 210 mm kraft paper piece having a basis weight of 70 g / m 2 was used as the backing layer. By using a Meyer bar, Hypod 8501 was directly coated onto the surface of the backing layer up to a target coating weight of 5 g / m 2 . Then, the coated kraft paper was heated in a Matis oven at a temperature of 130 °C for 3 minutes to form an intermediate layer on the backing layer. 2.8 g of non-vinyl polysiloxane (SYL-OFF™ SL 7028) was slowly added to 100 g of solvent-free vinyl-functionalized polysiloxane (SYL-OFF™ SL 200) with vigorous stirring, and then 1.5 g of a Pt-siloxane complex catalyst SYL-OFF™ 4000 was added with vigorous stirring. The mixture thus formed was applied to the outer surface of the intermediate layer by using a Meyer bar and then heated in an oven at 120 °C for 30 seconds to form a release layer having a dry coating weight of 2 g / m 2 .

[0053] Examples 2 - 3 In these examples, the procedure of Example 1 was repeated except that the formulation of the release layer was changed according to that shown in Table 2.

[0054] Comparative Example 1 Comparative Example 1 provides a non-coated kraft paper piece of 297 mm × 210 mm.

[0055] Comparative Example 2 In this comparative example, a 10 μm PE coating layer was coated (by extrusion coating technology) onto the surface of a 297 mm × 210 mm kraft paper piece to produce PEK (PE-coated kraft paper). Since PEK has been widely used in the prior art as a backing layer or a release liner in many commercial products such as adhesive tapes or adhesive labels, it was used in Comparative Examples 2 and 3 to show the technical effects of the examples of the present invention.

[0056] Comparative Example 3 In Comparative Example 3, 2.8 g of non-vinyl polysiloxane (SYL-OFF™ SL 7028) was slowly added to 100 g of solvent-free vinyl-functionalized polysiloxane (SYL-OFF™ SL 200) with vigorous stirring, and then 1.5 g of Pt-siloxane complex catalyst SYL-OFF™ 4000 was added with vigorous stirring. After applying the thus-formed mixture to the outer surface of the PEK using a Mayer bar, it was heated in an oven at 120 °C for 30 seconds to form a release layer with a dry coating weight of 2 g / m 2 which is 2 .

[0057] Comparative Example 4 In Comparative Example 4, a 297 mm × 210 mm PEK piece prepared according to Comparative Document 2 was used as the backing layer, and Hypod 8501 was directly coated onto the surface of the backing layer up to a target coating weight of 5 g / m 2 using a Mayer bar. Then, the coated PEK was heated in a Matis oven at a temperature of 130 °C for 3 minutes. No release layer was applied.

[0058] Comparative Examples 5 - 15 In these examples, the procedure of Example 1 was repeated except that the formulation of the release layer was changed according to that shown in Table 2, and all the release layers had a dry coating weight of 2 g / m 2 .

[0059]

Table 2

[0060] The release liners prepared in the above Examples and Comparative Examples of the present invention were evaluated for their properties by the following techniques.

[0061] Coatability The coating properties of Examples 1 to 3 of the present invention and Comparative Examples 3 and 4 to 15 were characterized and evaluated by the following procedure: The formulation (A) bath was applied onto paper (kraft or PEK) having or not having the intermediate layer described in Table 2. If the bath was evenly distributed and a thin film could be formed on the surface within 5 seconds, the coating property was reported as "qualified"; otherwise, the sample was reported as "unqualified".

[0062] The characteristic evaluation results summarized in Table 2 show that only Examples 1 to 3 of the present invention and Comparative Examples 11 and 13 have good coating properties, which represents good compatibility between the intermediate layer and the release layer. Comparative Documents 1 to 3 and 4 were not subjected to characteristic evaluation because they did not have a release layer or an intermediate layer.

[0063] As can be seen from the characteristic evaluation results shown in Table 2, the release layer prepared using an aqueous formulation shows poor compatibility with the intermediate layer, and the intermediate layer prepared by using RHODBARR (trademark) 320 having a composition beyond the present disclosure also shows poor compatibility. Since the comparative examples with poor coating properties are not practically unusable, they were not subjected to further characteristic evaluation.

[0064] Abrasion resistance The abrasion resistance characteristics of Examples 1 to 3 of the present invention and Comparative Examples 3, 11, and 13 were characterized and evaluated by the following procedure.

[0065] Offline rub off by thumb: This test was carried out immediately after the preparation of the release liner. The central part of the release layer of the release liner was rubbed 10 times with a clean thumb with appropriate force, and then the release layer was observed with the naked eye to confirm the presence or absence of powder scattering. In order to clarify the difference between the rubbed area and the non-rubbed area, a straight line was drawn on the surface with a marking pen. Samples that show neither powder nor different appearance were given a "qualified" result, and otherwise were reported as "unqualified".

[0066] Post-curing friction shedding by thumb: The release liners prepared in Examples 1 to 3 and Comparative Examples 3, 11, and 13 of the present invention were aged at ambient temperature for 2 days, and then the central portion of the release layer was rubbed 60 times with a clean thumb with appropriate force. After that, the release layer was observed with the naked eye to confirm the presence or absence of powder scattering. In order to clarify the difference between the rubbed area and the non-rubbed area, a straight line was drawn on the surface with a marking pen. Samples that showed no powder and no different appearance were given a "pass" result, and those that did not were reported as "fail".

[0067] Friction shedding by machine: This test was carried out immediately after the preparation of the release liner. Three samples with a diameter of φ30 mm were sliced from the release liner, and three blank samples (without a release layer) with the same dimensions were also sliced. The release coating weight of the samples was calibrated with the blank samples and measured with an Oxford 8000, and the measured data was recorded as the coating weight before rubbing (g / m 2 ). The samples were fixed on a platen and rubbed 30 cycles under a load of 1 kg using a friction head. Then, the release coating weight was measured again with an Oxford 8000 and recorded as the coating weight before rubbing (g / m 2 ). The percentage of retention rate (RO) can be calculated by the following formula: Retention rate (%) = (coating weight after rubbing ÷ coating weight before rubbing) × 100%.

[0068] The measurements for each example or comparative example were repeated 3 times, and the average results were summarized in Table 3 below.

[0069] Subsequent Adhesive Strength (SAS) SAS was evaluated according to the Finat standard test method FTM 11.

[0070] Specifically, a pressure-sensitive adhesive tape Nitto31B was laminated on the release layer of the release liner, and the laminated sample was pressed twice at a rolling speed of 10 mm / second using a FINAT roller. The sample was placed on glass, and 20 g / cm 2Covered with a flat metal plate under the load of [[ID=]], and then held at 70 °C for 20 hours to ensure close contact between the adhesive and the release layer. The sample was taken out and held at ambient temperature for 1 hour. The Nitto 31B adhesive tape was peeled off from the release liner, laminated on the PET film, and pressed twice at a rolling speed of 10 mm / second using a FINAT roller. The laminate was held under ambient conditions for 1.5 hours, and then the laminate was fixed on an AR-1500 tensile tester, and the peel strength was measured by peeling the sample at an angle of 180° under a Joe separation speed of 300 mm / min. The above procedure was repeated 3 times, and the average result was reported as the "average adhesion force to the test sample".

[0071] Furthermore, by laminating the Nitto 31B adhesive tape on the blank Teflon, the above procedure was repeated 3 more times, and the average result was reported as the "average adhesion force on the blank Teflon".

[0072] SAS can be calculated by the following formula: SAS (%) = (average adhesion force on the test sample ÷ average adhesion force on the blank Teflon) × 100%.

[0073] The results of the SAS characteristic evaluation are summarized in Table 3.

[0074] Peel force The peel force was measured according to the Finat standard test method FTM 10.

[0075] The release liners prepared in the above examples and comparative examples were held at 23 °C or 70 °C for 2 days. The Tesa 7475 adhesive tape was laminated on the release layer of the release liner, and the laminated sample was pressed twice at a rolling speed of 10 mm / second using a FINAT roller. The sample was placed on the glass, 20 g / cm 2It was covered with a flat metal plate under the load of , and then held at a temperature of 70 °C for 20 hours to ensure close contact between the adhesive and the release layer. The sample was taken out and held at ambient temperature for 1 hour. Then, the laminate was fixed on an AR-1500 tensile tester, and the peel force was measured by peeling the sample at an angle of 180° under a Joe separation speed of 300 mm / min. The above procedure was repeated three times, and the average result was reported in g / inch as the "peel force at 23 °C" or "peel force at 70 °C".

[0076]

Table 3

[0077] As can be seen from the characteristic evaluation results summarized in Table 3, all of the examples of the present invention can exhibit better friction resistance, appropriate adhesion / peel characteristics of two adhesive tapes, and good anti-aging characteristics than the comparative examples.

[0078] Recyclability The recyclability of each release liner was measured by weighing a 25-gram release liner sample and adding it to 2 liters of water. The sample was blended and disintegrated using a normal blender blade for 10 minutes at a stirring speed of 3000 rpm and a temperature of 50 °C. Then, the dispersion was filtered through a screen mesh having a screen size of 0.010 inches. The solid residue captured on the screen was rinsed with a small amount of DI water, dried at 60 °C for 2 hours, weighed, and the percentage of insoluble matter was calculated. The results are reported in Table 4 as the rejection rate (%), and the higher the percentage value, the higher the insolubility and the poorer the recyclability.

[0079]

Table 4

[0080] As can be seen from the results shown in Table 4, all of the release liners prepared using Examples 1 to 3 of the present invention exhibit better recyclability than the comparative examples.

[0081] To summarize the above, the present disclosure has developed formulations for the release layer and the intermediate layer of the release liner, and the combination of these two layers has achieved excellent repulpability, coatability, and good mechanical properties, such as abrasion resistance, adhesive strength, peel force, etc.

Claims

1. A composite composition for preparing a repulpable release liner, comprising: (A) a first formulation comprising a vinyl-functionalized polysiloxane, a non-vinyl polysiloxane, and a noble metal-siloxane complex catalyst; and (B) a second formulation comprising at least one olefin (co)polymer and at least one olefin-(meth)acrylic copolymer; wherein the first formulation is independent of the second formulation, and the composite composition is for preparing a repulpable release liner.

2. The composite composition according to claim 1, wherein the first formulation is solvent-free.

3. The vinyl-functionalized polysiloxane has the formula (1): [Vi(R ２ ) ２ SiO １／２ ｍ -(SiO ４／２ ) ｎ -(R ３ SiO ３／２ ) ｐ -[(R ４ ) ２ SiO ２／２ ｑ -[(R ５ ) ３ SiO １／２ ｒ Formula (1) (wherein R ２ , R ３ , R ４ , and R ５ are each independently selected from the group consisting of H, C １ -C １６ alkyl group, and C １ -C １６ alkoxy group, and combinations thereof, the subscript m is an integer from 1 to 100, and each of the subscripts n, p, q, and r is independently an integer from 0 to 500, and 3 ≤ n + p + q + r ≤ 2000), the composite composition according to claim 1.

4. The non-vinyl polysiloxane has the formula (3): [[(R ６ ) ３ SiO １／２ ａ -(SiO ４／２ ) ｂ -(R ７ SiO ３／２ ) ｃ [[(R ８ ) ２ SiO ２／２ ｄ Formula (3)​​ (wherein R ６ , R ７ , and R ８ each independently represents H, C １ -C １６ alkyl group, and C １ -C １６ alkoxy group, and combinations thereof, the subscript a is an integer from 2 to 100, each of the subscripts b, c, and d is independently an integer from 0 to 200, and 3 ≦ a + b + c + d ≦ 800), the composite composition according to claim 1.

5. The noble metal-siloxane complex catalyst contains at least one noble metal and a siloxane ligand, the noble metal is selected from the group consisting of Pt, Pd, Ru, Rh, Os, Ir, Ag, their alloys and mixtures, and the siloxane ligand is optionally selected from the group consisting of hydrogen, C １ -C １６ alkyl, C １ -C １６ alkoxy, C ２ -C １６ The composite composition according to claim 1, which is a monosiloxane, disiloxane, trisiloxane, or tetrasiloxane optionally containing one or more substituents selected from the group consisting of alkenyl.

6. The first formulation comprises 80 to 99% by weight of a vinyl-functionalized polysiloxane, 0.05 to 10% by weight of a non-vinyl polysiloxane, and 0.05 to 10% by weight of a noble metal-siloxane complex catalyst, based on the total weight of the first formulation, according to claim 1.

7. The olefin (co)polymer is a homopolymer of C ２ -C １６ alkene, a copolymer of two or more C ２ -C １６ alkenes, or a copolymer of at least one C ２ -C １６ alkene and at least one vinyl comonomer, The olefin-(meth)acrylic copolymer has at least one C ２ -C １６ copolymer of an alkene and at least one (meth)acrylic monomer, wherein the (meth)acrylic monomer is methacrylic acid, acrylic acid, methacrylamide, acrylamide, methacrylonitrile, acrylonitrile, (C １ -C １２ alkyl methacrylate, (C １ -C １２ alkyl acrylate, and any combination thereof, the composite composition according to claim 1.

8. The second formulation comprises 10 to 50% by weight of the olefin (co)polymer, 2 to 30% by weight of the olefin-(meth)acrylic copolymer, and 30 to 75% by weight of water, based on the total weight of the second formulation, according to claim 1.

9. A repulpable release liner prepared using the composite composition according to any one of claims 1 to 8, comprising: (I) a release layer formed using the first formulation; (II) an intermediate layer formed using the second formulation; and (III) a backing layer. The release liner.

10. The backing layer is made of a repulpable material selected from the group consisting of kraft paper, coated kraft paper, pressure-sensitive paper, cellophane, coated cellophane, rubberized paper, recycled paper, polylactic acid, polybutylene succinate / caproate, polyhydroxybutyrate / valerate, polyvinyl succinate, polycaprolactone, starch, modified cellulose, and any combination thereof, according to claim 9.

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