Decrosslinked polyolefin resin, composition containing same, and method for preparing same

Abstract

Disclosed in the present invention is a decrosslinked polyolefin resin having a Tan (δ) value of 0.7 or more at 0.1 rad / s, defined by equation 1, and a total amount of crosslinking by-products of 50-700 ppm: [Equation 1] Tan (δ) = G'' / G' (In equation 1, G'' is a loss modulus of the decrosslinked polyolefin resin at 0.1 rad / s, and G' is a storage modulus of the decrosslinked polyolefin resin at 0.1 rad / s.) According to the present invention, the gel fraction may be high, the elongation may be high, the off-flavor may be reduced, and processability and decrosslinking properties may be excellent.

Description

Decrosslinked polyolefin resin, composition containing the same, and method for manufacturing the same

[0001] The present invention relates to a decrosslinked polyolefin resin, a resin composition containing the same, and a method for manufacturing the same. More specifically, the present invention relates to a decrosslinked polyolefin resin obtained by recycling a crosslinked polyolefin resin, which has a low gel fraction, high elongation, reduced off-flavor, and excellent processability and decrosslinkability, a composition containing the same, and a method for manufacturing the same.

[0002] Cross-linked polyolefin resins are used in applications such as power cables due to their excellent insulation properties and thermal and chemical resistance. Although various plastic recycling methods are currently being researched for resource conservation, most cross-linked polyolefin resins are not currently being effectively recycled. To address this, a method is required to de-crosslink the polyolefin by removing its cross-linking structure.

[0003] Conventional decrosslinked polyolefin resins undergo decrosslinking at high extruder temperatures to maintain a low gel fraction. However, if decrosslinking proceeds excessively, the off-flavor characteristics are poor due to a large amount of crosslinking by-products, and mechanical properties such as elongation are degraded as the molecular weight decreases. Conversely, if the decrosslinking reaction does not proceed smoothly and there are few crosslinking by-products, the off-flavor characteristics are good, but there is a problem with a high gel fraction and reduced processability.

[0004] Therefore, it is necessary to develop a decrosslinked polyolefin resin having a low gel fraction and reduced odor containing appropriate crosslinking by-products, a resin composition containing the same, and a method for manufacturing the same.

[0005] Related prior art is Korean Patent Publication No. 10-2018-0038842.

[0006] The objective of the present invention is to provide a decrosslinked polyolefin resin having a Tan(δ) value of 0.7 or higher, a low gel fraction, and a high elongation rate, a composition including the same, and a method for manufacturing the same.

[0007] Another objective of the present invention is to provide a decrosslinked polyolefin resin with reduced off-flavor due to a reduction in the total amount of crosslinking by-products generated during decrosslinking, a composition containing the same, and a method for manufacturing the same.

[0008] Another objective of the present invention is to provide a decrosslinked polyolefin resin with excellent processability and decrosslinkability, a composition containing the same, and a method for manufacturing the same.

[0009] The above and other objectives of the present invention can all be achieved by the present invention described below.

[0010] 1. One aspect of the present invention relates to a decrosslinked polyolefin resin. The decrosslinked polyolefin resin has a Tan(δ) value of about 0.7 or higher at 0.1 rad / s defined by Formula 1 below, and a total amount of crosslinking byproducts of about 50 ppm to 700 ppm:

[0011] [Equation 1]

[0012] Tan(δ) = G'' / G'

[0013] (In Equation 1, G'' is the loss modulus of the decrosslinked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decrosslinked polyolefin resin at 0.1 rad / s).

[0014] 2. In the above embodiment 1, the crosslinking byproduct may include α-Methylstyrene, Acetophenone, α-Cumylalcohol, or a combination thereof.

[0015] 3. In the above 1 to 2 embodiments, the decrosslinked polyolefin resin may have a gel fraction of about 10% by weight or less and an elongation rate of about 100% or more.

[0016] 4. In the above 1 to 3 embodiments, the decrosslinked polyolefin resin may be a decrosslinked polyolefin resin crosslinked by a peroxide.

[0017] 5. In the above 1 to 4 embodiments, the decrosslinked polyolefin resin may satisfy Formula 2 below:

[0018] [Equation 2]

[0019] 50 ≤ G0' / G' ≤ 3000

[0020] (In Equation 2, G0' is the storage modulus of the cross-linked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decross-linked polyolefin resin at 0.1 rad / s).

[0021] 6. In the above 1 to 5 embodiments, the decrosslinked polyolefin resin may be a crosslinked polyolefin resin biscuited in the presence of a subcritical fluid or a supercritical fluid.

[0022] 7. Another aspect of the present invention relates to a composition. The composition comprises the decrosslinked polyolefin resin of embodiments 1 to 6.

[0023] 8. In the above 7 embodiments, the resin composition may further include a cross-linked polyolefin resin.

[0024] 9. In the above 7 to 8 embodiments, the composition may contain about 0.01 to 95 parts by weight of the cross-linked polyolefin resin with respect to 100 parts by weight of the decross-linked polyolefin resin.

[0025] 10. In the above 7 to 9 embodiments, the composition may further include a general new polyolefin resin in an amount of about 5% to 95% by weight.

[0026] 11. Another aspect of the present invention relates to a method for producing a decrosslinked polyolefin resin. The method comprises the step of biscuiting a crosslinked polyolefin resin such that at 0.1 rad / s defined by Formula 1 below, the Tan(δ) value is about 0.7 or higher, and the total amount of crosslinking byproducts is about 50 ppm to 700 ppm:

[0027] [Equation 1]

[0028] Tan(δ) = G'' / G'

[0029] (In Equation 1, G'' is the loss modulus of the decrosslinked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decrosslinked polyolefin resin at 0.1 rad / s).

[0030] 12. In the above 11 embodiments, the crosslinking byproduct may include α-Methylstyrene, Acetophenone, α-Cumylalcohol, or a combination thereof.

[0031] 13. In the above 11 to 12 embodiments, the twin-screw extrusion can be performed at an extruder temperature of about 250°C to 380°C and a die temperature of about 220°C to 330°C.

[0032] 14. In the above 11 to 13 embodiments, the biscuit extrusion may be performed in the presence of a subcritical fluid or a supercritical fluid.

[0033] 15. In the above 11 to 14 embodiments, the subcritical fluid or supercritical fluid may be selected from one or more of carbon dioxide, alcohol, acetone, and water.

[0034] 16. In the above 11 to 15 embodiments, the decrosslinked polyolefin resin may have a gel fraction of about 10 weight% or less and an elongation of about 100% or more.

[0035] 17. In the above 11 to 16 embodiments, the cross-linked polyolefin resin may include a cross-linked polyolefin resin formed by a peroxide.

[0036] The present invention has the effect of providing a decrosslinked polyolefin resin having a Tan(δ) value of about 0.7 or higher, a low gel fraction, a high elongation rate, a reduced total amount of crosslinking by-products generated upon decrosslinking resulting in reduced off-flavor, and excellent processability and decrosslinkability, a composition including the same, and a method for manufacturing the same.

[0037] Figure 1 compares the total amount of crosslinking by-products and the gel fraction of Examples 1 to 4 and Comparative Examples 1 to 4.

[0038] The present invention will be described in more detail below. Where terms such as 'comprising,' 'having,' and 'consisting of' are used in this specification, other parts may be added unless 'only' is used. Where a component is expressed in the singular, it includes cases where it includes the plural unless specifically stated otherwise.

[0039] In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement.

[0040] Hereinafter, a decrosslinked polyolefin resin according to an embodiment of the present invention, a resin composition including the same, and a method for manufacturing the same will be described in detail with reference to the drawings.

[0041]

[0042] One aspect of the present invention relates to a decrosslinked polyolefin resin.

[0043] Generally, crosslinking refers to the bonding of one polymer chain to another, in which monomers are repeatedly connected, while de-crosslinking refers to the process of removing or weakening crosslinking bonds.

[0044] The decrosslinked polyolefin resin according to the present invention can be prepared by a decrosslinking reaction of a crosslinked polyolefin resin. The decrosslinking reaction can be performed to control the physical properties of the polymer or to improve recyclability.

[0045] The above polyolefin resin may include olefin-based homopolymers such as polyethylene and polypropylene, or olefin-based random or block copolymers formed from polymers of two or more olefin monomers. The above polyethylene may be ultra-low density polyethylene (ULDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), or a combination thereof. However, it is not limited to the types of polyethylene described above.

[0046] The above decrosslinked polyolefin resin has a Tan(δ) value of approximately 0.7 or higher at 0.1 rad / s as defined by Formula 1 below:

[0047] [Equation 1]

[0048] Tan(δ) = G'' / G'

[0049] (In Equation 1, G'' is the loss modulus of the decrosslinked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decrosslinked polyolefin resin at 0.1 rad / s).

[0050] In a specific example, the Tan(δ) value of the decrosslinked polyolefin resin at 0.1 rad / s may be about 0.8 or higher, for example, about 1 to 6, preferably about 1 to 2. When the Tan(δ) value of the decrosslinked polyolefin resin at 0.1 rad / s is about 0.70 or higher, it has excellent decrosslinkability and can secure properties close to those of the polyolefin before crosslinking, thereby having excellent recyclability.

[0051] In addition, the total amount of crosslinking by-products in the above-mentioned decrosslinked polyolefin resin is about 50 ppm to 700 ppm. Generally, when decrosslinking of a crosslinked polyolefin resin is carried out at a high extruder temperature, a large amount of crosslinking by-products is generated. In particular, the above-mentioned crosslinking by-products may include by-products generated by the use of dicumyl peroxide (DCP). In a specific example, the crosslinking by-products may include α-methylstyrene, acetophenone, α-cumyl alcohol, or a combination thereof.

[0052] In a specific example, the total amount of crosslinking by-products of the decrosslinked polyolefin resin may be about 52 ppm to 600 ppm, for example, about 55 ppm to 500 ppm, preferably about 57 ppm to 400 ppm, and more preferably about 60 ppm to 330 ppm. If decrosslinking proceeds significantly and the total amount of crosslinking by-products exceeds about 700 ppm, the off-flavor characteristics are poor, and there is a problem in that mechanical properties such as elongation are degraded due to a decrease in molecular weight. In addition, if the total amount of crosslinking by-products is less than about 50 ppm because the decrosslinking reaction does not proceed smoothly, the off-flavor characteristics are good, but the gel fraction is high and the Tan(δ) value is low, resulting in poor processability. In particular, if the gel fraction exceeds about 10 wt% or the Tan(δ) value is less than about 0.7, there is a problem in that the viscosity increases during processing, increasing the extrusion load and making processing difficult. The present invention features a decrosslinked polyolefin that has a low gel fraction and high processability, as well as a reduced off-flavor due to a decrease in the total amount of crosslinking by-products generated during decrosslinking.

[0053] The above decrosslinked polyolefin resin may have a gel fraction of about 10 weight% or less. In a specific example, the gel fraction may be about 8 weight% or less, for example, about 6 weight% or less, preferably about 3 weight% or less, most preferably about 0.01 to 1.5 weight%. Within the above range, the gel fraction is low, so the decrosslinkability is excellent.

[0054] The above decrosslinked polyolefin resin may have an elongation of about 100% or more. In a specific example, the elongation may be about 150% or more, for example about 200% or more, preferably about 200% to 600%. In the above range, the elongation is high, so the flexibility is excellent.

[0055] The above-mentioned decrosslinked polyolefin resin may be a decrosslinked agent of a crosslinked polyolefin resin by a peroxide. In a specific example, the peroxide may include dicumyl peroxide (DCP). The dicumyl peroxide is activated by heat to promote crosslinking and can be used to activate a crosslinking agent. That is, the dicumyl peroxide is decomposed by heat to generate free radicals, and the free radicals can promote bonding between polyolefin molecules to form a crosslinked structure.

[0056] The above decrosslinked polyolefin resin can satisfy Formula 2 below:

[0057] [Equation 2]

[0058] 50 ≤ G0' / G' ≤ 3000

[0059] (In Equation 2, G0' is the storage modulus of the cross-linked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decross-linked polyolefin resin at 0.1 rad / s).

[0060] In a specific example, the above G0' / G' may be about 100 to 2500, for example, about 100 to 2000, preferably about 150 to 1500, more preferably about 150 to 500. In the above range, decrosslinkability is excellent.

[0061] The above-mentioned decrosslinked polyolefin resin may be a crosslinked polyolefin resin biscuited in the presence of a subcritical or supercritical fluid. The supercritical fluid has excellent solute penetration power and reactivity, allowing it to penetrate into the polymer resin with a large free volume and uniformly transfer thermal energy. Through this, a recycled resin of uniform quality can be produced during the decrosslinking process of a crosslinked product.

[0062] The above fluid may be a carbon-10 alcohol, acetone, water, an organic solvent, carbon dioxide, etc. The above alcohol may be a monohydric, dihydric, or polyhydric alcohol. In specific examples, methanol, ethanol, etc. may be used. However, it is not limited to the fluids described above. In addition, the above fluid may be added in an amount of about 0.1 wt% to 20 wt%, in specific examples about 1 wt% to 15 wt%, for example about 3 wt% to 9 wt%. Within this range, not only can excellent decrosslinkability be secured, but a low gel fraction is also obtained. Furthermore, within this range, the total amount of crosslinking by-products generated during decrosslinking is reduced, which can reduce off-flavor.

[0063]

[0064] Another aspect of the present invention relates to a composition comprising the above-described decrosslinked polyolefin resin.

[0065] In a specific example, the composition may further include a cross-linked polyolefin resin. That is, the composition may include a decross-linked polyolefin resin and a cross-linked polyolefin resin. When a mixture of decross-linked polyolefin and cross-linked polyolefin is applied in this manner, mechanical properties that may be low when using only decross-linked polyolefin resin can be reinforced, and additionally, resin odors can be diluted.

[0066] The above composition can be applied by mixing a cross-linked polyolefin resin in an amount of about 0.01 to 95 parts by weight with 100 parts by weight of a decross-linked polyolefin resin. In a specific example, it may be about 1 to 85 parts by weight, for example, about 10 to 75 parts by weight. Within the above range, it has excellent decrosslinkability, and the total amount of crosslinking by-products generated during decrosslinking is reduced, which can reduce off-flavor.

[0067] In addition, in a specific embodiment, the composition may further include a general new polyolefin resin. That is, the composition may include a blend of a decrosslinked polyolefin resin and a general new polyolefin resin.

[0068] The above composition may further include a general new polyolefin resin in an amount of about 5% to 95% by weight. In a specific example, it may include about 10% to 90% by weight, for example, about 15% to 85% by weight. Within the above range, it has excellent decrosslinkability, and the total amount of crosslinking by-products generated during decrosslinking is reduced, which can reduce off-flavor.

[0069]

[0070] Another aspect of the present invention relates to a method for manufacturing a decrosslinked polyolefin resin.

[0071] The above method includes the step of biscuiting a crosslinked polyolefin resin such that the Tan(δ) value at 0.1 rad / s defined by Equation 1 is about 0.7 or higher, and the total amount of crosslinking byproducts is about 50 ppm to 700 ppm.

[0072] The above-mentioned twin-screw extrusion can be performed at an extruder temperature of about 250°C to 380°C and a die temperature of about 220°C to 330°C. In a specific example, the extruder temperature may be about 270°C to 370°C, for example, about 290°C to 350°C. In addition, in a specific example, the die temperature may be about 230°C to 315°C, for example, about 240°C to 300°C. In the above range, not only can excellent decrosslinkability be secured, but a low gel fraction is also obtained. Furthermore, in the above range, the total amount of crosslinking by-products generated during decrosslinking is reduced, thereby reducing off-flavor.

[0073] The above-described twin-screw extrusion can be performed in the presence of a subcritical fluid or a supercritical fluid. The subcritical fluid or supercritical fluid is as described above and is therefore omitted below. In addition, the subcritical fluid or supercritical fluid may be selected from one or more of carbon dioxide, alcohol, acetone, and water. In the specific examples, alcohols having 1 to 4 carbon atoms, organic solvents, carbon dioxide, etc. may be used. However, it is not limited to the fluids described above.

[0074] The above-mentioned crosslinked polyolefin resin may include a polyolefin resin crosslinked by a peroxide. In a specific example, the peroxide may include dicumyl peroxide (DCP). The dicumyl peroxide is activated by heat to promote crosslinking and can be used to activate a crosslinking agent. The decrosslinking process of the polyolefin resin crosslinked by the peroxide is simple, and it can be easily reused after decrosslinking.

[0075]

[0076] The present invention is to be explained more specifically below through examples and comparative examples; however, these examples are for illustrative purposes only and should not be interpreted as limiting the invention.

[0077]

[0078] Examples

[0079] The components used in each of the following examples and comparative examples are as follows:

[0080] (a1) XLPE: Cross-linked polyethylene resin (XLPE for pipes) with a density (ASTM D1505) of 0.918 g / cm3 and a gel fraction of 91 wt% was used.

[0081]

[0082] Example 1

[0083] Decrosslinked polyethylene resin was produced by decrosslinking extrusion of XLPE (a1) using a twin-screw extruder (SM Platek, 30 mmφ Screw) at 330°C and a die temperature of 260°C at a feed rate of 6 kg / h.

[0084]

[0085] Example 2

[0086] The procedure was performed in the same manner as Example 1 above, except that decrosslinking extrusion was carried out at a die temperature of 280℃ and a feed rate of 4kg / h.

[0087]

[0088] Example 3

[0089] The procedure was performed in the same manner as Example 1, except that decrosslinking extrusion was carried out at a feed rate of 4 kg / h.

[0090]

[0091] Example 4

[0092] The procedure was performed in the same manner as Example 1 above, except that 3.5 wt% of supercritical ethanol (a) was injected to carry out decrosslinking extrusion.

[0093]

[0094] Comparative Example 1

[0095] XLPE (a1) that was not subjected to decrosslinking extrusion was used.

[0096]

[0097] Comparative Example 2

[0098] Decrosslinking extrusion was performed at 390°C using a uniaxial extruder.

[0099]

[0100] Comparative Example 3

[0101] 250, except that decrosslinking extrusion was carried out at a feed rate of 8 kg / h at a die temperature of 200℃, it was performed in the same manner as Example 1 above.

[0102]

[0103] Comparative Example 4

[0104] The procedure was performed in the same manner as Example 1 above, except that decrosslinking extrusion was carried out at 230℃.

[0105]

[0106] The physical properties of the above examples and comparative examples were evaluated by the following method, and the results are shown in Table 1:

[0107]

[0108] Physical property evaluation method

[0109] (1) Gel fraction (wt%)

[0110] Gel fraction was analyzed using Xylene according to ASTM D2765 standards. In this case, 120-mesh stainless steel was used, and the gel content was measured by extracting in Xylene at a temperature of 140°C or higher and drying, and the gel fraction was defined as the percentage of the weight of the insoluble matter relative to the weight of the raw sample.

[0111]

[0112] (2) Tan(δ) (loss factor)

[0113] A frequency sweep test of the sample was conducted using a rheological property measuring instrument (Modular Compact Rheometer 301 (MCR 301, Anton Paar)) at a temperature of 190°C, a shear strain of 1%, and a frequency of 0.1 rad / s to 500 rad / s.

[0114] The above sample was manufactured in the form of a sheet with a diameter of 25 mm and a thickness of 1 mm using a hot press.

[0115] At this time, the storage modulus (G') and loss modulus (G'') of the sample were measured at a temperature of 190°C and a frequency of 0.1 rad / s, and Tan(δ) was calculated using G'' / G' according to Equation 1 below:

[0116] [Equation 1]

[0117] Tan(δ) = G'' / G'

[0118] (In Equation 1, G'' is the loss modulus of the decrosslinked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decrosslinked polyolefin resin at 0.1 rad / s).

[0119]

[0120] In addition, the storage modulus before and after decrosslinking at 0.1 rad / s was measured, and the ratio of the storage modulus (G0' / G') was calculated. G0' is the storage modulus of the crosslinked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decrosslinked polyolefin resin at 0.1 rad / s.

[0121]

[0122] (3) Growth rate (%)

[0123] Elongation was measured at a speed of 50 mm / min using a Type IV specimen of ASTM D638.

[0124]

[0125] (4) Total amount of cross-linking byproducts (ppm)

[0126] The total amount of crosslinking byproducts of the sample was measured using HPLC (High performance liquid chromatography, Agilent).

[0127] Solvent extraction pretreatment of the above sample was performed by placing approximately 1 g of the sample into a 30 mL reaction vial, adding 10 mL of solvent (IPA, cyclohexane), aging it in an oven preheated to 72 °C for 2 hours, and then filtering it. Subsequently, HPLC of the pretreated sample was measured.

[0128]

[0129] (5) Smell (Sensory evaluation)

[0130] The average value of the scores evaluated by a panel of six people was calculated. The scores ranged from 0 to 5 points, with a reference value of 3 points, and scores closer to 0 were assigned as the odor was less intense.

[0131] Gel fraction (wt%) Tan(δ) Elongation (%) Total amount of crosslinking byproducts (ppm) Odor (Sensory evaluation) G0' / G' Example 1 1.11.02 176 118 Average (3) 185 Example 2 1.21.66 232275 Average (3) 323 Example 3 1.11.45 261324 Average (3) 209 Example 4 5.80.801 1875 Average (3) 153 Comparative Example 1 >900.05 212464 Severe (5) 1 Comparative Example 2 0.24.3237 21 Severe (5) 930.655 Comparative Example 3 10.80.85 43243 Average (3) 77 Comparative Example 4 8.30.68 23830 Average (3) 109

[0132]

[0133] As shown in Table 1 above, it can be confirmed that Examples 1-4 according to the present invention have a significantly low gel fraction, a high elongation rate, and a low total amount of crosslinking byproducts. On the other hand, Comparative Example 1 has a high total amount of crosslinking byproducts compared to Examples 1-4, resulting in a strong odor, a high gel fraction, and a low Tan(δ) value; Comparative Example 2 has a low gel fraction and a high Tan(δ) value, but has a low elongation rate and a high total amount of crosslinking byproducts, resulting in a strong odor. Additionally, it can be confirmed that Comparative Example 3 has a high gel fraction despite high elongation rate and Tan(δ) value, and Comparative Example 4 has a low Tan(δ) value despite high elongation rate.

[0134]

[0135] Simple variations or modifications of the present invention can be easily implemented by those skilled in the art, and all such variations or modifications are considered to be included within the scope of the present invention.

Claims

1. As a decrosslinked polyolefin resin, At 0.1 rad / s defined by Equation 1 below, the Tan(δ) value is 0.7 or greater, and Decrosslinked polyolefin resin having a total amount of crosslinking by-products of 50 ppm to 700 ppm: [Equation 1] Tan(δ) = G'' / G' (In Equation 1, G'' is the loss modulus of the decrosslinked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decrosslinked polyolefin resin at 0.1 rad / s).

2. In Paragraph 1, A decrosslinked polyolefin resin in which the crosslinking byproduct comprises α-Methylstyrene, Acetophenone, α-Cumylalcohol, or a combination thereof.

3. In Paragraph 1, The above decrosslinked polyolefin resin is a decrosslinked polyolefin resin having a gel fraction of 10 weight% or less and an elongation of 100% or more.

4. In Paragraph 1, The above-mentioned decrosslinked polyolefin resin is a decrosslinked polyolefin resin that is a decrosslinked body of a crosslinked polyolefin resin by a peroxide.

5. In claim 4, the decrosslinked polyolefin resin satisfies the following formula 2: [Equation 2] 50 ≤ G0' / G' ≤ 3000 (In Equation 2, G0' is the storage modulus of the cross-linked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decross-linked polyolefin resin at 0.1 rad / s).

6. In Paragraph 1, The above-mentioned decrosslinked polyolefin resin is a decrosslinked polyolefin resin that is biscuitly extruded from a crosslinked polyolefin resin in the presence of a subcritical fluid or a supercritical fluid.

7. A composition comprising a decrosslinked polyolefin resin according to any one of claims 1 to 6.

8. In Paragraph 7, The above composition further comprises a cross-linked polyolefin resin.

9. In Paragraph 8, The above composition comprises 0.01 to 95 parts by weight of the cross-linked polyolefin resin per 100 parts by weight of the decross-linked polyolefin resin.

10. In Paragraph 7, The above composition further comprises 5% to 95% by weight of a general new polyolefin resin.

11. A method for manufacturing a decrosslinked polyolefin resin, comprising the step of biscuiting a crosslinked polyolefin resin such that at 0.1 rad / s defined by Formula 1 below, the Tan(δ) value is 0.7 or higher and the total amount of crosslinking byproducts is 50 ppm to 700 ppm: [Equation 1] Tan(δ) = G'' / G' (In Equation 1, G'' is the loss modulus of the decrosslinked polyolefin resin at 0.1 rad / s, and G' is the storage modulus of the decrosslinked polyolefin resin at 0.1 rad / s).

12. In Paragraph 11, A method for manufacturing a decrosslinked polyolefin resin, wherein the crosslinking byproduct comprises α-Methylstyrene, Acetophenone, α-Cumylalcohol, or a combination thereof.

13. In Paragraph 11, A method for manufacturing a decrosslinked polyolefin resin, wherein the above-mentioned twin-screw extrusion is performed at an extruder temperature of 250°C to 380°C and a die temperature of 220°C to 330°C.

14. In Paragraph 11, A method for manufacturing a decrosslinked polyolefin resin, wherein the above-mentioned twin-screw extrusion is performed in the presence of a subcritical fluid or a supercritical fluid.

15. In Paragraph 14, A method for manufacturing a decrosslinked polyolefin resin, wherein the above subcritical fluid or supercritical fluid is selected from one or more of carbon dioxide, alcohol, acetone, and water.

16. In Paragraph 11, A method for manufacturing a decrosslinked polyolefin resin, wherein the decrosslinked polyolefin resin has a gel fraction of 10 weight% or less and an elongation rate of 100% or more.

17. In Paragraph 11, A method for manufacturing a decrosslinked polyolefin resin, wherein the crosslinked polyolefin resin comprises a crosslinked polyolefin resin formed by a peroxide.

Images