Biodegradable resin composition for aircap and biodegradable aircap comprising same

Abstract

The present invention provides a biodegradable resin composition for an aircap and a biodegradable aircap comprising same, the biodegradable resin composition comprising: a biodegradable resin containing an aliphatic-aromatic polyester resin; an inorganic filler; a slip agent; and a chain extender. In addition, the present invention provides a biodegradable resin composition for an aircap, which is environmentally friendly and has improved chemical and physical properties, and a biodegradable aircap comprising same.

Description

Biodegradable resin composition for air cap and biodegradable air cap comprising the same

[0001] The present invention relates to a biodegradable resin composition for air caps and a biodegradable air cap comprising the same.

[0002]

[0003] With growing concerns about environmental issues, solutions are being sought for the disposal of various household goods, especially disposable products. Specifically, petroleum-based polymer materials are widely used in the manufacture of various products such as films, fibers, packaging materials, bottles, and containers due to their low cost and excellent processability. However, when incinerated at the end of their useful life, they emit hazardous substances, and depending on the type, they can take hundreds of years to completely decompose naturally.

[0004] To overcome the limitations of these petroleum-based polymer materials, active research is being conducted on biodegradable resins that decompose in a relatively short period of time. Biodegradable resins such as polylactic acid (PLA), polybutyleneadipate terephthalate (PBAT), and polybutylene succinate (PBS) are being introduced as alternatives.

[0005] However, when manufacturing biodegradable resin into air cap for use as a cushioning material, insulation material, etc., there were difficulties in ensuring fairness, and due to the chemical and physical properties of biodegradable resin, there were limitations in securing the properties required in the product field to be used.

[0006]

[0007] The present invention provides an environmentally friendly biodegradable resin composition for air caps with improved chemical and physical properties, and a biodegradable air cap comprising the same.

[0008]

[0009] A biodegradable resin composition for an air cap according to the present invention comprises a biodegradable resin including an aliphatic-aromatic polyester resin, an inorganic filler, a slip agent, and a chain extender.

[0010] In one embodiment of the present invention, the content of the inorganic filler may be 10 wt % to 40 wt % based on the total weight of the biodegradable resin composition for the air cap.

[0011] In one embodiment of the present invention, the inorganic filler has an average particle diameter (D 50 ) is 1 ㎛ to 2 ㎛, and the span (D 90 -D 10 / D 50 ) may contain calcium carbonate having a molecular weight of 4 or less.

[0012] In one embodiment of the present invention, the content of the slip agent may be 1 wt % to 10 wt % based on the total weight of the biodegradable resin composition for air cap.

[0013] In one embodiment of the present invention, the slip agent may be derived from a slip agent masterbatch.

[0014] In one embodiment of the present invention, the slip agent masterbatch may further include an anti-blocking agent.

[0015] In one embodiment of the present invention, the content of the chain extender may be 0.1 wt % to 1 wt % based on the total weight of the biodegradable resin composition for air cap.

[0016] In one embodiment of the present invention, the biodegradable resin may further include an aliphatic polyester resin.

[0017] In one embodiment of the present invention, the biodegradable resin composition for the air cap may have a melt index of 1 g / 10 min to 5 g / 10 min at 190° C. and 2.16 kg according to ASTM D1238.

[0018] The biodegradable air cap according to the present invention comprises a biodegradable resin including an aliphatic-aromatic polyester resin, an inorganic filler, a slip agent, and a chain extender.

[0019] In one embodiment of the present invention, the biodegradable air cap includes a base film and an air cap film laminated to at least one surface of the base film, and the air cap film may have a surface energy of 30 mN / m or less according to DIN 53364.

[0020] In one embodiment of the present invention, the base film may have a contact angle with water of 80° to 120°.

[0021] In one embodiment of the present invention, when the air cap film is measured using a three-dimensional roughness measuring device, Spk (reduced peak height) / Svk (reduced valley depth) according to ISO 25178 may be 1.5 or more.

[0022] In one embodiment of the present invention, the adhesive strength between the base film and the air cap film is 1.2 kgf / mm. 2 It may be excessive.

[0023] In one embodiment of the present invention, the biodegradable air cap may have a haze of greater than 1% and less than 50% according to ASTM D1003 when measured using a standard colorimeter.

[0024]

[0025] The biodegradable resin composition for air caps according to the present invention comprises a biodegradable resin comprising an aliphatic-aromatic polyester resin. Therefore, air caps manufactured from the biodegradable resin composition can be biodegraded within a short period of time after disposal, thereby reducing product disposal costs and preventing environmental pollution.

[0026] The biodegradable resin composition for air caps according to the present invention includes an inorganic filler. This allows for a relatively reduced content of the biodegradable resin, resulting in a cost-saving effect. Furthermore, the thermal stability of the biodegradable resin can be improved, thereby suppressing degradation of the biodegradable resin during the extrusion process. Furthermore, the surface energy and contact angle of air caps manufactured from the biodegradable resin composition can be controlled, thereby compensating for the vulnerability of the biodegradable resin to moisture. Furthermore, the inorganic filler provides an anti-blocking agent effect, thereby suppressing blocking problems that may occur during the processing of the air caps, thereby improving workability, facilitating cleaning, and enhancing the printing quality of the air cap surface.

[0027] The biodegradable resin composition for air caps according to the present invention includes a slip agent and a chain extender. This improves the efficiency of air cap manufacturing and enhances the adhesive strength between the base film forming the air cap and the air cap film.

[0028] The biodegradable resin composition for air caps according to the present invention may select calcium carbonate with controlled average particle diameter and span as an inorganic filler. This may result in improved biodegradability compared to inorganic fillers such as silica, improved dispersibility of the inorganic filler within the biodegradable resin, and controlled surface roughness and haze of air caps manufactured from the biodegradable resin composition. Furthermore, by controlling the surface roughness of the air cap within a specific range, when the air cap is used as a cushioning material, friction with the object is enhanced, thereby absorbing impact energy of the object, and minimizing moisture deposition on the surface of the air cap. Furthermore, when the air cap is attached to a window or the like and used as an insulating material, friction with the adherend is increased, thereby improving adhesive stability. Furthermore, as the haze of the air cap increases, light transmittance may decrease, thereby improving UV resistance.

[0029]

[0030] FIG. 1 schematically illustrates a biodegradable air cap according to one embodiment of the present invention.

[0031] Figure 2 schematically illustrates the surface of an aircap film among biodegradable aircaps according to one embodiment of the present invention.

[0032] Figure 3 is an image of the surface of the air cap film manufactured in Example 1 measured using a three-dimensional roughness measuring device.

[0033]

[0034] The structural or functional descriptions of the embodiments disclosed in this specification or application are merely illustrative for the purpose of explaining embodiments according to the technical idea of ​​the present invention, and the embodiments according to the technical idea of ​​the present invention can be implemented in various forms other than the embodiments disclosed in this specification or application, and the technical idea of ​​the present invention is not construed as being limited to the embodiments described in this specification or application.

[0035] When a component is referred to as "including" in this specification or application, unless otherwise specifically stated, this does not exclude other components, but rather implies the inclusion of additional components. Furthermore, all numerical ranges indicating physical properties, dimensions, etc. of components described in this specification or application are to be understood as being modified by the term "about" in all cases, unless otherwise specified.

[0036] 'ppm' in this specification or application means weight basis.

[0037] The description of “A and / or B” in this specification or application means “A, B, or A and B.”

[0038]

[0039] The biodegradable resin composition for air cap according to the present invention comprises a biodegradable resin including an aliphatic-aromatic polyester resin.

[0040] The above aliphatic-aromatic polyester resin may include a diol-derived unit, an aliphatic dicarboxylic acid-derived unit, and an aromatic dicarboxylic acid-derived unit.

[0041] The above diol may be an aliphatic diol. The above diol may be a bio-derived diol. The above diols are ethanediol, 1,2-propanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-ethyl-2-isobutyl-1,3-propanediol, 1,2-butanediol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 1,6-hexanediol, 2-ethyl-1,3-hexanediol, 2,4-dimethyl-2-ethyl-1,3-hexanediol, 2,2,4-trimethyl-1,6-hexanediol, 2-methyl-1,8-octanediol, At least one may be selected from the group consisting of 1,9-nonanediol, 1,10-decanediol and 1,12-octadecanediol or derivatives thereof.

[0042] The above diol may be selected from the group consisting of 1,4-butanediol, 1,2-ethanediol, 1,3-propanediol, diethylene glycol, neopentyl glycol or derivatives thereof. The above diol may be selected from the group consisting of 1,4-butanediol, 1,2-ethanediol, 1,3-propanediol or derivatives thereof. The above diol may include 1,4-butanediol or a derivative thereof.

[0043] The aliphatic dicarboxylic acid may be at least one selected from the group consisting of oxalic acid, malonic acid, succinic acid, maleic acid, fumaric acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid or derivatives thereof. The aliphatic dicarboxylic acid may be at least one selected from the group consisting of adipic acid, succinic acid, sebacic acid or derivatives thereof. The aliphatic dicarboxylic acid may include adipic acid or a derivative thereof.

[0044] The above aromatic dicarboxylic acid may be at least one selected from the group consisting of phthalic acid, terephthalic acid, isophthalic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, anthracenedicarboxylic acid, phenanthrenedicarboxylic acid, or derivatives thereof. The above aromatic dicarboxylic acid may be at least one selected from the group consisting of terephthalic acid, dimethyl terephthalate, 2,6-naphthalene dicarboxylic acid, isophthalic acid, or derivatives thereof. The above aromatic dicarboxylic acid may include terephthalic acid, dimethyl terephthalate, or derivatives thereof.

[0045] In the above aliphatic-aromatic polyester resin, the molar ratio of the total diol residues including the diol and the total dicarboxylic acid residues including the aromatic dicarboxylic acid and the aliphatic dicarboxylic acid may be from about 1:0.9 to about 1:1.1, or from about 1:0.95 to about 1:1.05.

[0046] In the above aliphatic-aromatic polyester resin, the molar ratio of the aromatic dicarboxylic acid residue and the aliphatic dicarboxylic acid residue may be from about 3:7 to about 7:3, from about 3.3:6.7 to about 6.7:3.3, from about 4:6 to about 6:4, or from about 4.2:5.8 to about 5:5.

[0047] The above aliphatic-aromatic polyester resin may include a diol residue derived from 1,4-butanediol in an amount of about 90 mol% or more, about 95 mol% or more, or about 98 mol% or more based on the total diol.

[0048] The above aliphatic-aromatic polyester resin may include aromatic dicarboxylic acid residues derived from terephthalic acid or dimethyl terephthalate in an amount of about 30 mol% to about 70 mol%, about 35 mol% to about 65 mol%, about 40 mol% to about 60 mol%, or about 43 mol% to about 53 mol% based on the total dicarboxylic acid.

[0049] The above aliphatic-aromatic polyester resin may include an aliphatic dicarboxylic acid residue derived from adipic acid in an amount of about 30 mol% to about 70 mol%, about 35 mol% to about 65 mol%, about 40 mol% to about 60 mol%, or about 47 mol% to about 57 mol% based on the total dicarboxylic acid.

[0050] The aliphatic-aromatic polyester resin may include a first block and a second block. The aliphatic-aromatic polyester resin may have a molecular structure in which the first block and the second block are alternately bonded.

[0051] The first block may include the diol residue and the aromatic dicarboxylic acid residue. The first block may be formed by an esterification reaction of the diol and the aromatic dicarboxylic acid. The first block may include only the diol residue and the aromatic dicarboxylic acid residue. The first block may include only repeating units formed by an esterification reaction of the diol and the aromatic dicarboxylic acid. The first block may refer to the sum of repeating units of the diol and the aromatic dicarboxylic acid before the aliphatic dicarboxylic acid is bonded.

[0052] The second block may include the diol residue and the aliphatic dicarboxylic acid residue. The second block may be formed by an esterification reaction of the diol and the aliphatic dicarboxylic acid. The second block may include only the diol residue and the aliphatic dicarboxylic acid residue. The second block may include only repeating units formed by an esterification reaction of the diol and the aliphatic dicarboxylic acid. The second block may refer to the sum of repeating units of the diol and the aliphatic dicarboxylic acid before the aromatic dicarboxylic acid is bonded.

[0053] In the aliphatic-aromatic polyester resin, the ratio (X / Y) of the number of the first blocks (X) to the number of the second blocks (Y) may be about 0.5 to about 1.5, about 0.6 to about 1.4, about 0.7 to about 1.3, about 0.75 to about 1.2, or about 0.8 to about 1. The number of the first blocks may be smaller than the number of the second blocks. The number of the first blocks may be about 30 to about 300, about 40 to about 250, about 50 to about 220, about 60 to about 200, about 70 to about 200, or about 75 to about 200. The number of the first blocks may vary depending on the content of the aromatic dicarboxylic acid, the molecular weight of the aliphatic-aromatic polyester resin, and the degree of alternation described below. That is, as the molar ratio of the aromatic dicarboxylic acid increases, as the molecular weight of the aliphatic-aromatic polyester resin increases, and as the degree of alternation described below increases, the number of the first blocks may increase.

[0054] The number of the second blocks may be about 30 to about 300, about 40 to about 250, about 50 to about 220, about 60 to about 200, about 70 to about 200, or about 75 to about 200. The number of the second blocks may vary depending on the content of the aliphatic dicarboxylic acid, the molecular weight of the aliphatic-aromatic polyester resin, and the degree of alternation described below.

[0055] When the aliphatic-aromatic polyester resin includes the first block and the second block in the above range, the biodegradable air cap including the aliphatic-aromatic polyester resin can have an appropriate mechanical strength while improving biodegradability.

[0056] The above aliphatic-aromatic polyester resin may include the following bonding structures 1 to 3.

[0057] [Combination Structure 1]

[0058] - Aromatic dicarboxylic acids - Diols - Aliphatic dicarboxylic acids -

[0059] [Combination Structure 2]

[0060] - Aromatic dicarboxylic acid - Diol - Aromatic dicarboxylic acid -

[0061] [Combination Structure 3]

[0062] - Aliphatic dicarboxylic acid - Diol - Aliphatic dicarboxylic acid -

[0063] The diol included in the above bonding structure 1 is bonded between the aromatic dicarboxylic acid and the aliphatic dicarboxylic acid, and to the aromatic dicarboxylic acid and the aliphatic dicarboxylic acid. The diol included in the above bonding structure 1 can be directly esterified between the aromatic dicarboxylic acid and the aliphatic dicarboxylic acid, and to the aromatic dicarboxylic acid and the aliphatic dicarboxylic acid.

[0064] The diol included in the above bonding structure 2 is bonded between the aromatic dicarboxylic acid and the aromatic dicarboxylic acid, and to the aromatic dicarboxylic acid and the aromatic dicarboxylic acid. The diol included in the above bonding structure 2 can be directly esterified between the aromatic dicarboxylic acid and the aromatic dicarboxylic acid, and to the aromatic dicarboxylic acid and the aromatic dicarboxylic acid.

[0065] The diol included in the above bonding structure 3 is bonded between the aliphatic dicarboxylic acid and the aliphatic dicarboxylic acid, and to the aliphatic dicarboxylic acid and the aliphatic dicarboxylic acid. The diol included in the above bonding structure 3 can be directly esterified between the aliphatic dicarboxylic acid and the aliphatic dicarboxylic acid and the aliphatic dicarboxylic acid.

[0066] The above aliphatic-aromatic polyester resin may have an alternating ratio. The alternating ratio is the ratio of the diol bonded between the aromatic dicarboxylic acid and the aliphatic dicarboxylic acid among the diols. That is, the alternating ratio may be the ratio of the diol included in the bonding structure 1 among the diols. The alternating ratio may be a value obtained by dividing the number of moles of the diol included in the bonding structure 1 by the sum of the number of moles of the diol included in the bonding structure 1, the number of moles of the diol included in the bonding structure 2, and the number of moles of the diol included in the bonding structure 3.

[0067] The above-mentioned exchange ratio may be the ratio of diols bonded between heterodicarboxylic acids among the total diols.

[0068] The above exchange ratio can be calculated using the following formula 1.

[0069] [Formula 1]

[0070]

[0071] In the above formula 1, DM1 is the molar ratio of the diol included in the bonding structure 1, DM2 is the molar ratio of the diol included in the bonding structure 2, and DM3 is the molar ratio of the diol included in the bonding structure 3.

[0072] In the above aliphatic-aromatic polyester resin, the alternation ratio may be about 0.3 to about 0.7, about 0.37 to about 0.59, about 0.4 to about 0.56, or about 0.45 to about 0.53.

[0073] The above aliphatic-aromatic polyester resin may include a hard segment. The hard segment ratio is the ratio of the diol bonded between the aromatic dicarboxylic acid and the aromatic dicarboxylic acid among the diols.

[0074] The above hard segment ratio may be the molar ratio of the diol included in the bonding structure 2 among the total diols. The above hard segment ratio may be a value obtained by dividing the number of moles of the diol included in the bonding structure 2 by the sum of the number of moles of the diol included in the bonding structure 1, the number of moles of the diol included in the bonding structure 2, and the number of moles of the diol included in the bonding structure 3.

[0075] The above hard segment ratio can be expressed by the following equation 2.

[0076] [Formula 2]

[0077]

[0078] In the above formula 2, DM1 is the molar ratio of the diol included in the bonding structure 1, DM2 is the molar ratio of the diol included in the bonding structure 2, and DM3 is the molar ratio of the diol included in the bonding structure 3.

[0079] The hard segment ratio may be from about 0.15 to about 0.35, from about 0.2 to about 0.3, from about 0.21 to about 0.29, or from about 0.22 to about 0.28.

[0080] The above aliphatic-aromatic polyester resin may include a soft segment.

[0081] The above soft segment ratio is the ratio of the diol bonded between the aliphatic dicarboxylic acid and the aliphatic dicarboxylic acid among the diols.

[0082] The above soft segment ratio may be the molar ratio of the diol included in the bonding structure 3 among the total diols. The above soft segment ratio may be a value obtained by dividing the number of moles of the diol included in the bonding structure 3 by the sum of the number of moles of the diol included in the bonding structure 1, the number of moles of the diol included in the bonding structure 2, and the number of moles of the diol included in the bonding structure 3.

[0083] The above soft segment ratio can be expressed by the following equation 3.

[0084] [Formula 3]

[0085]

[0086] In the above formula 3, DM1 is the molar ratio of the diol included in the bonding structure 1, DM2 is the molar ratio of the diol included in the bonding structure 2, and DM3 is the molar ratio of the diol included in the bonding structure 3.

[0087] The soft segment ratio may be from about 0.16 to about 0.36, from about 0.21 to about 0.31, from about 0.22 to about 0.30, or from about 0.23 to about 0.29.

[0088] The above soft segment ratio may be greater than the above hard segment ratio.

[0089] The ratio of the hard segment to the soft segment may be about 0.92 to about 0.99. That is, the value obtained by dividing the DM2 by the DM3 may be about 0.92 to about 0.99.

[0090] The above-mentioned alternation ratio, the hard segment ratio, and the soft segment ratio can be measured by nuclear magnetic resonance spectroscopy. The above-mentioned aliphatic-aromatic polyester resin composition is dissolved in a solvent such as CDCl3, and at room temperature, by a nuclear magnetic resonance (NMR) device, 1 H-NMR and / or 13 It can be analyzed by C-NMR analysis.

[0091] When the diol is 1,4-butanediol, the aromatic dicarboxylic acid is terephthalic acid or dimethyl terephthalate, and the aliphatic dicarboxylic acid is adipic acid, the analysis of the aliphatic-aromatic polyester resin by nuclear magnetic resonance spectroscopy may include a first peak, a second peak, a third peak, a fourth peak, a fifth peak, a sixth peak, a seventh peak, an eighth peak, a ninth peak, a tenth peak, and an eleventh peak.

[0092] When the diol is 1,4-butanediol, the aromatic dicarboxylic acid is terephthalic acid or dimethyl terephthalate, and the aliphatic dicarboxylic acid is adipic acid, analysis of the aliphatic-aromatic polyester resin by nuclear magnetic resonance spectroscopy may include a peak derived from the diol of the bonding structure 1, a peak derived from the diol of the bonding structure 2, and a peak derived from the bonding structure 3 at about 3.5 ppm to about 4.6 ppm.

[0093] In the range of about 3.5 ppm to about 4.6 ppm, the first peak, the second peak, the third peak, and the fourth peak may be defined in order from high ppm to low ppm. In addition, based on the ppm of the ninth peak, the first peak, the second peak, the third peak, and the fourth peak may be defined in order from high ppm to low ppm in the range of about -3.4 ppm to about -4.3 ppm.

[0094] -ppm direction can be upfield or shielded. For example, -3.4 ppm can mean 3.4 ppm upfield. For example, -3.4 ppm can mean 3.4 ppm shielded.

[0095] Analysis of the aliphatic-aromatic polyester resin by the nuclear magnetic resonance spectroscopy may include a peak derived from the diol of the bonding structure 1, a peak derived from the diol of the bonding structure 2, and a peak derived from the bonding structure 3 at about 1.0 ppm to about 2.5 ppm.

[0096] In the range of about 1.0 ppm to about 2.5 ppm, the tenth peak, the fifth peak, the sixth peak, the seventh peak, the eighth peak, and the eleventh peak may be defined in order from high ppm to low ppm. In the range of about -6.0 ppm to about -6.7 ppm based on the ppm of the ninth peak, the fifth peak, the sixth peak, the seventh peak, the eighth peak, and the eleventh peak may be defined in order from high ppm to low ppm.

[0097] In the range of about 7.5 ppm to about 8.5 ppm, the ninth peak may be formed. The ninth peak may be derived from the aromatic dicarboxylic acid. The ninth peak may be derived from an aromatic ring included in the aromatic dicarboxylic acid. The ninth peak may be derived from an aromatic ring included in the terephthalic acid or dimethyl terephthalate.

[0098] The above tenth peak and the above eleventh peak may be derived from the aliphatic dicarboxylic acid. The above tenth peak and the above eleventh peak may be derived from the adipic acid.

[0099] The first peak may be located at about -3.6 ppm to about -3.68 ppm based on the ppm of the ninth peak. The second peak may be located at about -3.69 ppm to about -3.75 ppm based on the ppm of the ninth peak. The third peak may be located at about -3.9 ppm to about -3.97 ppm based on the ppm of the ninth peak. The fourth peak may be located at about -3.98 ppm to about -4.1 ppm based on the ppm of the ninth peak. The fifth peak may be located at about -6.0 ppm to about -6.19 ppm based on the ppm of the ninth peak. The sixth peak may be located at about -6.2 ppm to about -6.26 ppm based on the ppm of the ninth peak. The seventh peak may be located at about -6.27 ppm to about -6.34 ppm based on the ppm of the ninth peak. The eighth peak may be located at about -6.35 ppm to about -6.42 ppm based on the ppm of the ninth peak. The tenth peak may be located at about -5.6 ppm to about -5.8 ppm based on the ppm of the ninth peak. The eleventh peak may be located at about -6.421 ppm to about -6.5 ppm based on the ppm of the ninth peak. The positions based on the ppm of the ninth peak may be the positions of each peak when the position of the ninth peak is 0 ppm.

[0100] The areas of the first peak, the second peak, the third peak, the fourth peak, the fifth peak, the sixth peak, the seventh peak, the eighth peak, the tenth peak, and the eleventh peak can be normalized based on the area of ​​the ninth peak. That is, when the area of ​​the ninth peak is 1, the areas of the first peak, the second peak, the third peak, the fourth peak, the fifth peak, the sixth peak, the seventh peak, the eighth peak, the tenth peak, and the eleventh peak can be relatively determined.

[0101] The above exchange ratio can be derived from the following equation 4 or equation 5.

[0102] [Formula 4]

[0103]

[0104] In the above formula 4, the PA1 is the area of ​​the first peak, the PA2 is the area of ​​the second peak, the PA3 is the area of ​​the third peak, and the PA4 is the area of ​​the fourth peak.

[0105] [Formula 5]

[0106]

[0107] In the above formula 5, the PA5 is the area of ​​the fifth peak, the PA6 is the area of ​​the sixth peak, the PA7 is the area of ​​the seventh peak, and the PA8 is the area of ​​the eighth peak.

[0108] The above hard segment ratio can be derived from the following equation 6 or equation 7.

[0109] [Formula 6]

[0110]

[0111] In the above formula 6, the PA1 is the area of ​​the first peak, the PA2 is the area of ​​the second peak, the PA3 is the area of ​​the third peak, and the PA4 is the area of ​​the fourth peak.

[0112] [Formula 7]

[0113]

[0114] In the above formula 7, the PA5 is the area of ​​the fifth peak, the PA6 is the area of ​​the sixth peak, the PA7 is the area of ​​the seventh peak, and the PA8 is the area of ​​the eighth peak.

[0115] The above soft segment ratio can be derived using Equation 8 or Equation 9 below.

[0116] [Formula 8]

[0117]

[0118] In the above formula 8, the PA1 is the area of ​​the first peak, the PA2 is the area of ​​the second peak, the PA3 is the area of ​​the third peak, and the PA4 is the area of ​​the fourth peak.

[0119] [Formula 9]

[0120]

[0121] In the above formula 9, the PA5 is the area of ​​the fifth peak, the PA6 is the area of ​​the sixth peak, the PA7 is the area of ​​the seventh peak, and the PA8 is the area of ​​the eighth peak.

[0122] The area of ​​the first peak may be about 0.35 to about 0.6, about 0.4 to about 0.55, about 0.43 to about 0.5, about 0.43 to about 0.52, or about 0.45 to about 0.49. The area of ​​the second peak may be about 0.37 to about 0.57, about 0.41 to about 0.54, about 0.45 to about 0.53, about 0.45 to about 0.55, or about 0.47 to about 0.53. The area of ​​the third peak may be about 0.37 to about 0.57, about 0.41 to about 0.54, about 0.45 to about 0.53, about 0.45 to about 0.55, or about 0.47 to about 0.53. The area of ​​the fourth peak may be about 0.4 to about 0.7, about 0.45 to about 0.65, about 0.48 to about 0.6, about 0.48 to about 0.60, or about 0.50 to about 0.58. The area of ​​the fifth peak may be about 0.35 to about 0.6, about 0.4 to about 0.55, about 0.43 to about 0.53, about 0.43 to about 0.52, or about 0.45 to about 0.49. The area of ​​the sixth peak may be about 0.35 to about 0.6, about 0.4 to about 0.55, about 0.43 to about 0.5, about 0.45 to about 0.55, or about 0.47 to about 0.53. The area of ​​the seventh peak may be about 0.41 to about 0.71, about 0.45 to about 0.65, about 0.48 to about 0.6, about 0.45 to about 0.55, or about 0.47 to about 0.53. The area of ​​the eighth peak may be about 0.4 to about 0.7, about 0.45 to about 0.65, about 0.48 to about 0.6, or about 0.50 to about 0.58. The area of ​​the tenth peak may be about 0.7 to about 2.5, about 0.75 to about 2, about 0.8 to about 1.5, about 1.0 to about 1.15, or about 1.02 to about 1.13. The area of ​​the eleventh peak may be about 0.It may be from about 7 to about 3.5, from about 0.7 to about 3, from about 0.8 to about 2.5, from about 1.0 to about 1.15, or from about 1.02 to about 1.13.

[0123] The sum of the area of ​​the first peak, the area of ​​the second peak, the area of ​​the third peak, and the area of ​​the fourth peak may be from about 1.49 to about 2.44, from about 1.81 to about 2.16, from about 1.9 to about 2.2, or from about 1.95 to about 2.1. Here, the sum of the area of ​​the first peak, the area of ​​the second peak, the area of ​​the third peak, and the area of ​​the fourth peak may refer to the sum of the total number of ester bonds based on the number of terephthalic acids. The sum of the area of ​​the second peak and the area of ​​the third peak may be from about 0.95 to about 1.10, or from about 0.98 to about 1.07. Here, the sum of the area of ​​the first peak and the area of ​​the third peak may refer to the extent of extension of the molecular bond of the aliphatic-aromatic polyester resin. The ratio of the area of ​​the fourth peak to the area of ​​the first peak (area of ​​the fourth peak / area of ​​the first peak) may be from about 1.1 to about 1.3, from about 0.67 to about 2, from about 0.96 to about 1.40, or from about 1.15 to about 1.25. The ratio of the area of ​​the fourth peak to the area of ​​the first peak may refer to the ratio of the soft segment to the hard segment within the molecular structure of the aliphatic-aromatic polyester resin. That is, the higher the ratio of the area of ​​the fourth peak to the area of ​​the first peak, the more the aliphatic-aromatic polyester resin may have improved adhesive properties. The ratio of the area of ​​the fourth peak to the area of ​​the third peak (area of ​​the fourth peak / area of ​​the third peak) may be from about 0.7 to about 1.89, from about 0.91 to about 1.33, from about 1.0 to about 1.2, or from about 1.01 to about 1.1. The ratio of the area of ​​the first peak to the area of ​​the second peak (area of ​​the first peak / area of ​​the second peak) may be from about 0.61 to about 1.62, from about 0.81 to about 1.11, from about 0.85 to about 0.95, or from about 0.86 to about 0.It may be 94. The ratio of the area of ​​the fifth peak to the area of ​​the first peak (area of ​​the fifth peak / area of ​​the first peak) may be about 0.61 to about 1.71, about 0.96 to about 1.40, about 0.8 to about 1.2, or about 0.9 to about 1.1. The ratio of the area of ​​the sixth peak to the area of ​​the second peak (area of ​​the sixth peak / area of ​​the second peak) may be about 0.58 to about 1.71, about 0.86 to about 1.16, about 0.8 to about 1.2, or about 0.9 to about 1.1. The ratio of the area of ​​the seventh peak to the area of ​​the third peak (area of ​​the seventh peak / area of ​​the third peak) may be about 0.72 to about 1.92, about 0.91 to about 1.33, about 0.8 to about 1.2, or about 0.9 to about 1.1. The ratio of the area of ​​the eighth peak to the area of ​​the fourth peak (area of ​​the eighth peak / area of ​​the fourth peak) may be about 0.59 to about 1.75, about 0.80 to about 1.2, or about 0.9 to about 1.1.

[0124] The number average molecular weight of the above aliphatic-aromatic polyester resin may be 20,000 g / mol to 100,000 g / mol, 20,000 g / mol to 80,000 g / mol, 20,000 g / mol to 70,000 g / mol, or 30,000 g / mol to 62,000 g / mol. When the above range is satisfied, the formability may be improved while having an appropriate biodegradability. The number average molecular weight may be measured using gel permeation chromatography (GPC).

[0125] The crystallinity of the above aliphatic-aromatic polyester resin may be 10% to 30%, 10% to less than 30%, 12% to less than 30%, 12% to 28%, or 15% to 25%. When the above range is satisfied, the release property may be improved.

[0126] The above crystallinity is measured by melting enthalpy (ΔH) using differential scanning calorimetry (DSC) according to ASTM D-3417. m ) is the melting enthalpy (ΔH) at 100% determination c ) can be calculated as a percentage of the value divided by .

[0127] Specifically, it can be calculated according to the following calculation formula.

[0128] [Calculation formula]

[0129] Crystallinity (%) = [Energy required to melt 1g of aliphatic-aromatic polyester resin (crystal melting energy (J / g) - crystal formation energy (J / g)) / Energy required to melt 1g of aliphatic-aromatic polyester resin with 100% crystallinity (J / g)] × 100

[0130] The content of the aliphatic-aromatic polyester resin may be 40 wt% to 90 wt%, 50 wt% to 90 wt%, 60 wt% to 90 wt%, or 65 wt% to 90 wt% based on the total weight of the biodegradable resin composition for the air cap. When the above range is satisfied, the formability can be improved, and the mechanical properties that can be imparted with functionality to the air cap can be satisfied.

[0131] The above biodegradable resin may further include an aliphatic polyester resin.

[0132] The content of the above aliphatic polyester resin may be from 0 wt % to 20 wt %, from 5 wt % to 20 wt %, from 7 wt % to 20 wt %, or from 10 wt % to 20 wt %, based on the total weight of the biodegradable resin composition for the air cap. When the above range is satisfied, the formability and mechanical properties may be improved.

[0133] The aliphatic polyester resin may have a glass transition temperature (Tg) of 50°C or higher. The glass transition temperature of the aliphatic polyester resin may be 50°C or higher, 50°C to 80°C, 50°C to 75°C, 50°C to 70°C, 55°C to 70°C, or 55°C to 65°C. When the above range is satisfied, the chain fluidity of the polymer may be reduced in the process of cooling the biodegradable resin composition for air cap, so that the change in volume may be minimized in the process of molding the biodegradable resin composition for air cap.

[0134] The above aliphatic polyester resin may include polylactic acid.

[0135] The above polylactic acid may include a unit represented by the following chemical formula.

[0136] [chemical formula]

[0137]

[0138] The above polylactic acid may be a high-melting-point polylactic acid having a stereocomplex crystal. In addition, the above polylactic acid may be formed by solution mixing or melt mixing of L-lactic acid and D-lactic acid.

[0139] The polylactic acid may be a polymer comprising L-lactic acid and / or D-lactic acid. The polylactic acid may comprise L-lactic acid and / or D-lactic acid.

[0140] Preferably, the polylactic acid comprises D-lactic acid, and the D-lactic acid may be present in an amount of 1 wt% to 5 wt%, 2 wt% to 5 wt%, 3 wt% to 5 wt%, or 4 wt% to 5 wt% based on the total weight of the polylactic acid. When the above range is satisfied, the moldability and heat resistance properties may be improved.

[0141] The above aliphatic polyester resin can be modified by a surface treatment agent.

[0142] The surface of the above-mentioned aliphatic polyester resin can be modified by the above-mentioned surface treatment agent. The biodegradable resin composition for the air cap can improve compatibility with the aliphatic-aromatic polyester resin by including the aliphatic polyester resin modified by the surface treatment agent, and can suppress the bleeding phenomenon in which the aliphatic polyester resin flows out onto the surface of the air cap.

[0143] The surface treatment agent may contain an amide group. The surface treatment agent may contain a fatty acid amide. The surface treatment agent containing the amide group can easily bond with the functional group of the aliphatic polyester resin, so that the surface of the aliphatic polyester resin can be more easily modified, thereby improving compatibility with the aliphatic-aromatic polyester resin and further suppressing the bleeding phenomenon.

[0144] The above surface-modified aliphatic polyester resin can be manufactured by the following method.

[0145] A surface treatment agent is added to the above aliphatic polyester resin, and the aliphatic polyester resin and the surface treatment agent are stirred so that the surface treatment agent can be bonded to the surface of the aliphatic polyester resin.

[0146] The stirring temperature may be from the melting point of the surface treatment agent to the melting point of the surface treatment agent + 50°C. The amount of the surface treatment agent added may be 0.1 parts by weight to 5 parts by weight, 0.1 parts by weight to 4 parts by weight, 0.1 parts by weight to 3 parts by weight, or 0.5 parts by weight to 3 parts by weight relative to 100 parts by weight of the aliphatic polyester resin.

[0147] The stirring time may be from about 1 minute to about 60 minutes, from about 1 minute to about 50 minutes, from about 5 minutes to about 50 minutes, or from about 5 minutes to about 40 minutes.

[0148] The biodegradable resin composition for air cap according to the present invention includes an inorganic filler.

[0149] By including the inorganic filler, the content of the biodegradable resin can be relatively reduced, resulting in economic benefits. Furthermore, the thermal stability of the biodegradable resin can be improved, thereby suppressing degradation of the biodegradable resin during the extrusion process. Furthermore, the surface energy and contact angle of the air cap manufactured from the biodegradable resin composition for air caps can be controlled, thereby compensating for the vulnerability to moisture, which is a disadvantage of the biodegradable resin. Furthermore, the inorganic filler can impart an anti-blocking agent effect, thereby suppressing blocking problems that may occur during processing of the air cap. Consequently, workability can be improved, cleaning can be facilitated, and printing quality on the surface of the air cap can be enhanced.

[0150] The content of the above-mentioned inorganic filler may be 10 wt % to 40 wt %, 15 wt % to 40 wt %, 15 wt % to 35 wt %, or 15 wt % to 30 wt % based on the total weight of the biodegradable resin composition for the air cap. When the above range is satisfied, the water resistance of the air cap can be improved, and the processability and processability in the extrusion process can be improved, thereby improving the productivity of the air cap.

[0151] The above inorganic filler has an average particle diameter (D 50 ) is 1 ㎛ to 2 ㎛, and the span (D 90 -D 10 / D 50 ) may include calcium carbonate having an average particle diameter (D ) of 4 or less. The inorganic filler may include calcium carbonate having an average particle diameter (D ) of 4 or less. 50 ) is 1 ㎛ to 1.9 ㎛, and the span (D 90 -D 10 / D 50 ) may include calcium carbonate having an average particle diameter (D ) of 4 or less. The inorganic filler may include calcium carbonate having an average particle diameter (D ) of 4 or less.50 ) is 1 ㎛ to 1.8 ㎛, and the span (D 90 -D 10 / D 50 ) may include calcium carbonate having an average particle diameter (D ) of 3.8 or less. The inorganic filler may include calcium carbonate having an average particle diameter (D ) of 3.8 or less. 50 ) is 1 ㎛ to 1.8 ㎛, and the span (D 90 -D 10 / D 50 ) may include calcium carbonate having a pH of 2 or more and 3.8 or less.

[0152] The above span (SPAN) is the particle size corresponding to 10% of the volume accumulation in the particle size distribution curve derived using the laser diffraction method. 10 , the particle size corresponding to 50% of the volume accumulation is D 50 , and the particle size corresponding to 90% of the volume accumulation is D 90 It can be calculated as follows.

[0153] When the above range is satisfied, biodegradability can be further improved, the dispersibility of the inorganic filler in the biodegradable resin can be improved, and the surface roughness and haze of the air cap manufactured from the biodegradable resin composition for the air cap can be controlled. In addition, by controlling the surface roughness of the air cap to a specific range, when the air cap is used as a cushioning material, the friction with the article is improved, so that the impact energy of the article can be absorbed, and the phenomenon of moisture deposition on the surface of the air cap can be minimized. In addition, when the air cap is attached to a window or the like and used as an insulating material, the friction with the adherend is increased, so that the bonding stability can be improved.

[0154] The calcium carbonate may be heavy calcium carbonate. When the inorganic filler includes heavy calcium carbonate, the dispersibility of the biodegradable resin may be improved, and excessive viscosity increase of the biodegradable resin composition for air cap may be suppressed. In addition, the tensile strength may be increased compared to light calcium carbonate, thereby improving mechanical properties.

[0155] The specific surface area of ​​the above heavy calcium carbonate is 0.1 m 2 / g to 10.0 m 2 / g, 0.1 m 2 / g to 9.0 m 2 / g, 0.1 m 2 / g to 8.0 m 2 / g, 0.1 m 2 / g to 7.0 m 2 / g, 0.1 m 2 / g to 6.0 m 2 / g, 0.1 m 2 / g to 5.0 m 2 / g, 0.1 m 2 / g to 4.0 m 2 / g, or 0.1 m 2 / g to 3.0 m 2 / g. The above specific surface area can be measured by a nitrogen gas adsorption method. When the above range is satisfied, it can be easily dispersed in the biodegradable resin, and processability can be improved.

[0156] The sphericity of the above-mentioned heavy calcium carbonate may be 0.30 to 0.95, 0.30 to 0.93, 0.30 to 0.90, 0.50 to 0.95, 0.50 to 0.93, 0.50 to 0.90, 0.60 to 0.95, 0.60 to 0.93, or 0.60 to 0.90. When the above range is satisfied, a large number of fine pores generated at the interface of the biodegradable resin and the inorganic filler may be included, thereby improving biodegradability and increasing strength.

[0157] The above heavy calcium carbonate may be surface-treated with an organic acid. By surface-treating the heavy calcium carbonate with the organic acid, the dispersibility within the biodegradable resin composition for the air cap may be increased, and the reactivity with the biodegradable resin may be improved. The surface treatment may be performed by a physical method such as plasma treatment or corona treatment, or a chemical method such as a silane coupling agent, a titanium coupling agent, or a surfactant. The organic acid may include a higher fatty acid, a higher fatty acid ester, a higher fatty acid amide, a higher fatty acid, and the like, and may be, for example, calcium stearate.

[0158] The above surface-treated heavy calcium carbonate can be manufactured by the following method.

[0159] First, calcium carbonate powder can be produced through a grinding process. Thereafter, the calcium carbonate powder can be classified to obtain calcium carbonate having a desired particle size.

[0160] Thereafter, the calcium carbonate can be heat treated at about 200°C to about 800°C by a heating device selected from a kiln, an electric furnace, or a microwave. The heat treatment time can be about 5 minutes to about 30 minutes, about 7 minutes to about 15 minutes, or about 7 minutes to about 14 minutes. The heat treatment temperature can be about 250°C to about 700°C or about 300°C to about 600°C. By heat treating the calcium carbonate under the above conditions, moisture within the calcium carbonate can be easily removed, the organic acid can be easily bound to the surface of the calcium carbonate, and agglomeration of the calcium carbonate can be minimized.

[0161] Thereafter, an organic acid may be added to the heat-treated calcium carbonate to perform a process of treating the surface of the calcium carbonate. The process temperature may be 70°C to about 130°C. The amount of the organic acid added may be about 0.5 parts by weight to about 5 parts by weight, about 0.5 parts by weight to about 4 parts by weight, about 0.5 parts by weight to about 3 parts by weight, about 0.5 parts by weight to about 2 parts by weight, about 0.6 parts by weight to about 5 parts by weight, about 0.6 parts by weight to about 4 parts by weight, about 0.6 parts by weight to about 3 parts by weight, about 0.6 parts by weight to about 2 parts by weight, about 0.7 parts by weight to about 5 parts by weight, about 0.7 parts by weight to about 4 parts by weight, about 0.7 parts by weight to about 3 parts by weight, or about 0.7 parts by weight to about 2 parts by weight, based on 100 parts by weight of the calcium carbonate. The process time may be from about 1 minute to about 60 minutes, from about 10 minutes to about 30 minutes, or from about 5 minutes to about 20 minutes.

[0162] Thereafter, the surface-treated calcium carbonate may undergo an additional process of crushing and classifying the aggregates aggregated in the surface treatment process. In the surface-treated calcium carbonate, the content of the organic acid may be about 0.1 wt% to about 3 wt%, about 0.1 wt% to about 2 wt%, about 0.1 wt% to about 1 wt%, about 0.2 wt% to about 3 wt%, about 0.2 wt% to about 2 wt%, about 0.2 wt% to about 1 wt%, about 0.3 wt% to about 3 wt%, about 0.3 wt% to about 2 wt%, or about 0.3 wt% to about 1 wt%, based on the total weight.

[0163] The above-mentioned calcium carbonate surface-treated with an organic acid may be partially oxidized. The above-mentioned surface-treated calcium carbonate may partially include calcium oxide (CaO). The proportion of the calcium oxide may be 5% by volume or less, 4% by volume or less, 3% by volume or less, 2% by volume or less, 1% by volume or less, 0.01% by volume or more to 5% by volume or less, 0.01% by volume or more to 4% by volume or less, 0.01% by volume or more to 3% by volume or less, 0.01% by volume or more to 2% by volume or less, or 0.01% by volume or more to 1% by volume, based on 100% by volume of the surface-treated calcium carbonate particles. The proportion of the calcium oxide may be measured by the EDTA (Ethylene diamine tetra acetic acid) titration method according to JIS R 9011. When the above range is satisfied, the uniformity of the surface of the calcium carbonate can be improved, and the phenomenon of organic acid being eluted from the surface of the calcium carbonate can be minimized, so that the water resistance can be improved.

[0164] The biodegradable resin composition for air caps according to the present invention includes a slip agent. The slip agent can provide lubrication during or after the processing process, thereby reducing the coefficient of friction.

[0165] The above-mentioned slip agent may be selected from the group consisting of oleamide, erucamide, oleyl palmitamide, stearly erucamide, and ethylene bis oleamide.

[0166] The content of the slip agent may be 1 wt % to 10 wt %, 1 wt % to 8 wt %, 1 wt % to 6 wt %, or 1 wt % to 5 wt % based on the total weight of the biodegradable resin composition for the air cap. When the above range is satisfied, the efficiency of manufacturing the biodegradable air cap can be improved, and the adhesive strength between the base film forming the biodegradable air cap and the air cap film can be improved.

[0167] The slip agent may be derived from a slip agent masterbatch. The slip agent masterbatch may be a state in which the slip agent is uniformly dispersed in an aliphatic-aromatic polyester base resin. Since the slip agent is derived from the slip agent masterbatch rather than being individually included in the biodegradable resin composition for air caps, the slip agent can be more uniformly dispersed in the biodegradable resin composition for air caps, thereby improving the consistency of the slip effect, and suppressing deterioration of mechanical properties and / or surface properties that may occur in a certain portion of the manufactured biodegradable air cap.

[0168] The above slip agent masterbatch may further include an anti-blocking agent. The anti-blocking agent can prevent the molded product from being laminated or from forming wrinkles.

[0169] The above anti-blocking agent may be selected from the group consisting of silica, silicone, talc, and talc.

[0170] The weight ratio of the slip agent included in the slip agent masterbatch to the anti-blocking agent may be 1:1 to 5:1, 1:1 to 4:1, 1:1 to 3:1, or 1:1 to 2.5:1. When the above range is satisfied, the compatibility with the biodegradable resin and the inorganic filler may be improved, and the surface uniformity of the biodegradable air cap produced may be improved.

[0171] The biodegradable resin composition for air caps according to the present invention includes a chain extender. The mechanical properties of the biodegradable air caps, such as tensile strength and elongation at break, can be improved by the chain extender.

[0172] The above chain extender may be selected from at least one selected from the group consisting of aromatic diisocyanate, aliphatic diisocyanate, isocyanurate, bisoxazoline, carboxylic anhydride, and epoxide.

[0173] The above aromatic diisocyanate may be at least one selected from the group consisting of tolylene 2,4-diisocyanate, tolylene 2,6-diisocyanate, 2,2'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, naphthylene 1,5-diisocyanate, and xylylene diisocyanate.

[0174] The above aliphatic diisocyanate may be at least one selected from the group consisting of 1,6-hexamethylene diisocyanate, isophorone diisocyanate, and methylenebis(4-isocyanatocyclohexane).

[0175] The above isocyanurate may include isophorone diisocyanate or methylenebis(4-isocyanatocyclohexane).

[0176] The above bisoxazoline may include at least one selected from the group consisting of 2,2'-bis(2-oxazoline), bis(2-oxazolinyl)methane, 1,2-bis(2-oxazolinyl)ethane, 1,3-bis(2-oxazolinyl)propane, and 1,4-bis(2-oxazolinyl)butane.

[0177] The above epoxide means an epoxy-containing copolymer based on at least one of styrene, acrylic acid ester and methacrylic acid ester, and a copolymer having a copolymer content of more than 20, more than 30, or more than 50 wt% having glycidyl (meth)acrylate is preferred.

[0178] The content of the chain extender may be 0.1 wt % to 1 wt %, 0.1 wt % to 0.9 wt %, 0.1 wt % to 0.8 wt %, 0.1 wt % to 0.7 wt %, or 0.1 wt % to 0.5 wt % based on the total weight of the biodegradable resin composition for the air cap. When the above range is satisfied, mechanical properties such as tensile strength and elongation at break can be improved without deterioration of the surface characteristics of the biodegradable air cap.

[0179] The biodegradable resin composition for the above air cap may include a lubricant.

[0180] The above-mentioned lubricant may include at least one selected from the group consisting of a fatty acid-based lubricant including stearic acid, an aliphatic alcohol-based lubricant, an aliphatic amide-based lubricant including stearamide, an aliphatic ester-based lubricant such as n-butyl stearate, methyl hydroxystearate, a polyhydric alcohol fatty acid ester, a saturated fatty acid ester, an ester-based wax, and a fatty acid metal soap-based lubricant.

[0181] The above-mentioned activator may include a first ester-based activator and a second activator containing calcium.

[0182] Specifically, the first active agent may be stearyl stearate, and the second active agent may be calcium stearate. The first active agent has an excellent effect of reducing friction between the inside of the resin composition and the mold surface, and the second active agent has the same calcium component as the inorganic filler calcium carbonate, so that it has excellent compatibility, reduces heat generation due to friction during mixing, melting, and processing of raw materials, and can improve manufacturing efficiency.

[0183] The weight ratio of the first activator to the second activator may be 3:1 to 1:3, 2.5:1 to 1:2.5, 2:1 to 1:2, or 1.5:1 to 1:1.5. When the above range is satisfied, the compatibility between the second activator and the calcium carbonate is improved, and due to the excellent lubricity of the first activator, molding friction is minimized, and the production speed of the biodegradable air cap according to the process can be improved.

[0184] The content of the above-mentioned active agent may be 0.1 wt % to 5 wt %, 0.1 wt % to 4 wt %, 0.1 wt % to 3 wt %, or 0.1 wt % to 2 wt % based on the total weight of the biodegradable resin composition for the air cap. When the above range is satisfied, the manufacturing efficiency can be improved without deterioration of the mechanical and chemical properties of the biodegradable air cap.

[0185] The biodegradable resin composition for the above air cap may include an antioxidant.

[0186] The above antioxidant may include at least one selected from the group consisting of a phosphorus-based antioxidant, a phenol-based antioxidant, and a pentaerythritol-based antioxidant.

[0187] The above-mentioned phosphorus antioxidant may be at least one selected from the group consisting of triesters, diesters, monoesters of phosphorous acid, such as triphenyl phosphite, trisnonylphenyl phosphite, and tris(2,4-di-t-butylphenyl)phosphite, trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, tris(nonylphenyl)phosphate, and 2-ethylphenyl diphenyl phosphate.

[0188] The above phenolic antioxidants are α-tocopherol, butylhydroxytoluene, sinapyl alcohol, vitamin E, n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 2-t-butyl-6-(3'-t-butyl-5'-methyl-2'-hydroxybenzyl)-4-methylphenyl acrylate, 2,6-di-t-butyl-4-(N,N-dimethylaminomethyl)phenol, 3,5-di-t-butyl-4-hydroxybenzyl phosphonate diethyl ester, 2,2-bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl It may be at least one selected from the group consisting of bis(3-(3,5-di-tert)-butyl-4-hydroxyphenyl)propanoate), pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane.

[0189] The above antioxidant may further include at least one selected from the group consisting of BHT, ascorbic acid, catechin, quercetin, dodecyl gallate, TBHQ, Ralox, Irganox 1135, Irganox 1076, nordihydroguaiaretic acid, epicatechin gallate, epigallocatechin gallate, epigallocatein, propyl gallate, 2,3,5-trihydroxybutyrophenone, butylated hydroxyanisole, 4-hydroxymethyl-2,6-di-tert-butylphenol, α-tocopherol, resveratrol, rutin, astaxanthin, lycopene, beta-carotene, and melatonin.

[0190] The biodegradable resin composition for the air cap further comprises a phenolic antioxidant and a phosphorus antioxidant, and a weight ratio of the phenolic antioxidant to the phosphorus antioxidant may be 1:1 to 1:5, 1:1 to 1:4.5, 1:1 to 1:4, or 1:2 to 1:4. When the above range is satisfied, the phenolic antioxidant can capture and neutralize free radicals, and the oxidation reaction can be suppressed by decomposing peroxides generated when oxidation is initiated by the phosphorus antioxidant. As a result, the thermal stability, color stability, and long-term storage stability of the biodegradable air cap manufactured by the molding process can be improved.

[0191] The content of the antioxidant may be 5 wt% or less, 4 wt% or less, 3 wt% or less, 2 wt% or less, 1.5 wt% or less, 1 wt% or less, 0.5 wt% or less, 0.3 wt% or less, 0 to 5 wt%, 0.01 to 4 wt%, 0.1 to 3 wt%, 1 to 3 wt%, 1 to 2 wt%, 0.01 to 0.3 wt%, 0.05 to 0.3 wt%, 0.15 to 0.3 wt%, or 0.2 to 0.3 wt%, based on the total weight of the biodegradable resin composition for the air cap.

[0192] The biodegradable resin composition for the above air cap may include a flame retardant. The flame retardant may include at least one selected from the group consisting of halogen-based flame retardants, phosphorus-based flame retardants, and non-phosphorus halogen-based flame retardants such as metal hydrates.

[0193] The above halogen-based flame retardant may include at least one selected from the group consisting of halogenated bisphenol-based compounds such as halogenated bisphenyl alkanes, halogenated bisphenyl ethers, halogenated bisphenyl thioethers, and halogenated bisphenyl sulfones, and bisphenol-bis(alkylether)-based compounds such as brominated bisphenol A, brominated bisphenol S, chlorinated bisphenol A, and chlorinated bisphenol S.

[0194] The above-mentioned phosphorus flame retardant may include at least one selected from the group consisting of tris(diethyl phosphinic acid)aluminum, bisphenol A bis(diphenyl phosphate), triaryl isopropyl phosphate, cresyl di-2,6-xylenyl phosphate, and aromatic condensed phosphate esters.

[0195] The metal hydrate may include aluminum trihydrate, magnesium dihydrate, or a combination thereof.

[0196] The above flame retardant may include at least one selected from the group consisting of antimony oxide, such as antimony trioxide or antimony pentoxide, zinc oxide, iron oxide, aluminum oxide, molybdenum oxide, titanium oxide, calcium oxide, and magnesium oxide, as a flame retardant additive to improve the flame retardant effect.

[0197] The biodegradable resin composition for the above air cap may include a dispersant. The dispersant may improve the dispersibility of solvents and solutes. The dispersant may include at least one selected from the group consisting of aliphatic polyester, polylactic acid, polyglycolic acid, polycaprolactone, and polyhydroxyalkanoate.

[0198] The dispersant may be included in an amount of 1 to 20 wt%, 1 to 15 wt%, 1 to 13 wt%, 1 to 11 wt%, 2 to 10 wt%, 5 to 15 wt%, 7 to 12 wt%, 2 to 8 wt%, 5 to 8 wt%, or 2 to 5 wt% based on the total weight of the biodegradable resin composition for the air cap.

[0199] The biodegradable resin composition for the air cap may include a hydrolysis inhibitor. When the weight average molecular weight (Mw) of the hydrolysis inhibitor is large, volatility may be low and hydrolysis resistance may be improved. When the weight average molecular weight (Mw) of the hydrolysis inhibitor is small, compatibility between components included in the biodegradable resin composition for the air cap may be increased.

[0200] The above hydrolysis inhibitor may be two types of hydrolysis inhibitors having different weight average molecular weights. In order to increase compatibility with the high-density polyethylene, one type of hydrolysis inhibitor having a weight average molecular weight (Mw) of 10,000 g / mol or less, 9,000 g / mol or less, 8,000 g / mol or less, 7,000 g / mol or less, 6,000 g / mol or less, or 5,000 g / mol or less may be used, and in order to lower volatility and improve hydrolysis resistance, one type of hydrolysis inhibitor having a weight average molecular weight of 10,000 g / mol or more, 20,000 g / mol or more, 30,000 g / mol or more, 40,000 g / mol or more, or 50,000 g / mol or more may be used. The above weight average molecular weight may be measured as a relative value to a standard PS (standard polystyrene) sample through GPC using THF as an eluent. When the above range is satisfied, the mechanical properties and water resistance of the biodegradable resin composition for the air cap can be improved.

[0201] The above hydrolysis inhibitor may include a carbodiimide compound.

[0202] The above carbodiimide compound may include a compound represented by the following chemical formula.

[0203] [chemical formula]

[0204]

[0205] In the above chemical formula, n is an integer from 1 to 20.

[0206] The above carbodiimide compounds are N,N'-di-o-tolylcarbodiimide, N,N'-diphenylcarbodiimide, N,N'-dioctyldecylcarbodiimide, N,N'-di-2,6-diketylphenylcarbodiimide, N-tolyl-N'cyclohexylcarbodiimide, N,N'-di-2,6-diisopropylphenylcarbodiimide, N,N'-di-2,6-di-tert-butylphenylcarbodiimide, N-tolyl-N'-phenylcarbodiimide, N,N'-di-p-nitrophenylcarbodiimide, N,N'-di-p-aminophenylcarbodiimide, N,N'-di-p-hydroxyphenylcarbodiimide, N,N'-di-cyclohexylcarbodiimide, It may be at least one selected from the group consisting of N,N'-di-p-tolylcarbodiimide, p-phenylene-bis-di-o-tolylcarbodiimide, p-phenylene-bisdicyclohexylcarbodiimide, hexamethylene-bisdicyclohexylcarbodiimide, ethylene-bisdiphenylcarbodiimide, and copolymers of benzene-2,4-diisocyanato-1,3,5-tris(1-methylethyl) homopolymer, 2,4-diisocyanato-1,3,5-tris(1-methylethyl) and 2,6-diisopropyl diisocyanate.

[0207] The weight average molecular weight of the above carbodiimide compound may be 500 g / mol to 100,000 g / mol, 600 g / mol to 100,000 g / mol, 700 g / mol to 100,000 g / mol, 800 g / mol to 90,000 g / mol, 900 g / mol to 80,000 g / mol, 1,000 g / mol to 70,000 g / mol, 1,000 g / mol to 60,000 g / mol, or 1,000 g / mol to 50,000 g / mol.

[0208] In the above carbodiimide-based compound, the content of the NCN group may be 1 wt% to 20 wt%, 1 wt% to 19 wt%, 1 wt% to 18 wt%, 1 wt% to 17 wt%, 1 wt% to 16 wt%, 1 wt% to 15 wt%, 2 wt% to 15 wt%, 3 wt% to 15 wt%, 4 wt% to 15 wt%, 5 wt% to 15 wt%, or 6 wt% to 15 wt%. The content of the NCN group in the carbodiimide-based compound can be measured by titration with oxalic acid. When the above range is satisfied, the water resistance of the biodegradable resin composition for air cap can be improved.

[0209] The content of the hydrolysis inhibitor may be 0.1 wt% to 5.0 wt%, 0.1 wt% to 4.0 wt%, 0.1 wt% to 3.0 wt%, 0.1 wt% to 2.0 wt%, 0.1 wt% to 1.5 wt%, or 0.1 wt% to 1.0 wt% based on the total weight of the biodegradable resin composition for the air cap. When the above range is satisfied, the hydrolysis resistance and odor reduction effect of the biodegradable resin composition for the air cap can be improved.

[0210] The content of the compound including the urea group may be 0.01 wt% to 10.00 wt%, 0.01 wt% to 9.00 wt%, 0.01 wt% to 8.00 wt%, 0.01 wt% to 7.00 wt%, 0.01 wt% to 6.00 wt%, 0.01 wt% to 5.00 wt%, 0.01 wt% to 4.00 wt%, or 0.01 wt% to 3.00 wt%, based on the total weight of the biodegradable resin composition for air cap. When the above range is satisfied, the proportion of functional groups included in the biodegradable resin composition for air cap that can react with moisture or acid is reduced, so that water resistance can be improved.

[0211] The biodegradable resin composition for the air cap may have a melt index at 190° C. and 2.16 kg of 1 g / 10 min to 5 g / 10 min, 1 g / 10 min to 4.8 g / 10 min, 1 g / 10 min to 4.5 g / 10 min, or 1.5 g / 10 min to 4.5 g / 10 min according to ASTM D1238. When the above range is satisfied, carbonization of the biodegradable resin composition for the air cap can be suppressed in the manufacturing process of the biodegradable air cap.

[0212] Fig. 1 schematically illustrates a biodegradable air cap according to one embodiment of the present invention. Referring to Fig. 1, the biodegradable air cap (100) includes a biodegradable resin including the aforementioned aliphatic-aromatic polyester resin, an inorganic filler, a slip agent, and a chain extender.

[0213] The biodegradable air cap (100) may include a base film (10) and an air cap film (20) laminated to at least one surface of the base film (10), and the air cap film (20) may have a surface energy of 30 mN / m or less, 29.5 mN / m or less, 29 mN / m or less, or 20 mN / m or more to 29 mN / m or less according to DIN 53364. When the above range is satisfied, after the biodegradable air cap is used as a cushioning material for a product, the phenomenon of the air cap being stuck to the product can be suppressed, and the biodegradable air cap can be easily separated from the product.

[0214] The above base film (10) may have a contact angle with water of 80° to 120°, 85° to 120°, 90° to 120°, or 90° to 110°. The contact angle can be measured by filling a cylinder with water, dropping about 2 μl on the surface of the base film (10), and using DMe-210 (KYOWA). When the above range is satisfied, the hydrophobic property is relatively improved, so that the biodegradable air cap can effectively protect the packaged item from water or moisture, and improve the moisture vulnerability of the biodegradable resin, thereby improving the durability in various environments.

[0215] The above air cap film (20) may have a static friction coefficient of 0.3 or less, 0.2 or less, 0.15 or less, or 0.01 or more to 0.15 or less according to ASTM D1894. When the above range is satisfied, the product is easy to handle, and the phenomenon of the biodegradable air cap being torn during the product packaging process can be suppressed.

[0216] Fig. 2 schematically illustrates the surface of an air cap film (20) among the biodegradable air caps (100), and Fig. 3 is an image of the surface of an air cap film (20) manufactured in Example 1 described below, measured using a three-dimensional roughness measuring device.

[0217] Referring to FIGS. 2 and 3, the aircap film (20) may have surface roughness. The surface roughness may refer to the surface roughness of the aircap film (20).

[0218] When the above air cap film (20) is measured with a 3D roughness measuring device, Spk (reduced peak height) / Svk (reduced valley depth) according to ISO 25178 may be 1.5 or more, 2.0 or more, 2.5 or more, or 2.5 or more to 4.5 or less. The Spk may be a reduced peak height, which may be an initial contact area when the air cap film (20) comes into contact with the surface of a product. The Svk may be a reduced valley depth, which may represent a valley depth below the center roughness of the surface of the air cap film (20). The content of moisture deposited on the surface of the air cap film (20) may be controlled according to the Svk value.

[0219] The above Spk / Svk value may be an indicator of the frictional characteristics when the aircap film (20) comes into contact with the surface of a product and a space where moisture, etc. may accumulate on the surface of the aircap film (20). As the Spk / Svk value decreases, the peak height of the surface of the aircap film (20) may decrease and the valley depth may relatively deepen, and as the Spk / Svk value increases, the peak height of the surface of the aircap film (20) may increase and the valley depth may relatively shallow.

[0220] When the above range is satisfied, the frictional force between the product in contact with the surface of the air cap film (20) can be improved, and the content of moisture deposited on the air cap film (20) can be minimized, so that the product storage stability and water resistance can be improved.

[0221] The adhesive strength between the above base film (10) and the above air cap film (20) is 1.2 kgf / mm 2 Exceeded, 1.3 kgf / mm 2 Above, 1.4 kgf / mm 2 or 1.4 kgf / mm 2 Ideally 1.6 kgf / mm 2The adhesive strength may be measured according to ASTM D3163. When the above range is satisfied, the durability and manufacturing efficiency of the biodegradable air cap can be improved, and product reliability can be enhanced.

[0222] The biodegradable air cap (100) may have a haze of more than 1% and less than 50%, more than 1% and less than 30%, more than 1% and less than 25%, or more than 1% and less than 10%, as measured by a standard colorimeter, based on ASTM D1003. When the above ranges are satisfied, light transmittance may be reduced, thereby improving the UV blocking effect.

[0223] The biodegradable resin composition for the air cap can be manufactured into a biodegradable air cap by an extrusion process. The temperature conditions in the extrusion process can be from about 195°C to about 220°C, from about 195°C to about 215°C, from about 195°C to about 210°C, or from about 195°C to about 205°C. When the above range is satisfied, the phenomenon of the biodegradable resin composition for the air cap being deteriorated in the extruder during the extrusion process can be prevented, and the phenomenon of carbonization and adhesion to the bonding roller can be suppressed.

[0224]

[0225] Hereinafter, the present invention will be described in more detail based on examples and comparative examples. However, the following examples and comparative examples are merely illustrative examples for further explaining the present invention, and the present invention is not limited to the following examples and comparative examples.

[0226]

[0227] Example

[0228] - Aliphatic-aromatic polyester resin: PBAT (Kingpa A400)

[0229] - Aliphatic polyester resin: PLA (Nature Works 2003D)

[0230] - Inorganic filler: Heavy calcium carbonate (average particle size of about 1.6 ㎛, span (D 90 -D 10 / D 50 ) about 2.5)

[0231] - Slip agent masterbatch: Pellets mixed with approximately 10 parts by weight of erucamide as a slip agent and approximately 5 parts by weight of spherical silica (average particle size of approximately 1 ㎛) as an anti-blocking agent, relative to 100 parts by weight of PBAT (Kingpa A400) base resin.

[0232] - Sleeping agent: Erucamide

[0233] - Anti-blocking agent: spherical silica (average particle size: approximately 1 ㎛)

[0234] - Chain extender: BASF Joncryl

[0235] - Active ingredient #1: Calcium stearate

[0236] - Active ingredient #2: Stearyl stearate

[0237] - Antioxidant #1: Phenolic antioxidant (Adeca Korea AO-60)

[0238] Antioxidant #2: Phosphorus Antioxidant (Adeca Korea 2112)

[0239]

[0240] Example 1

[0241] A resin composition containing 74.6 wt% of aliphatic-aromatic polyester resin, 20 wt% of inorganic filler, 4 wt% of slip agent masterbatch, 0.2 wt% of chain extender, 0.4 wt% of lubricant #1, 0.6 wt% of lubricant #2, 0.07 wt% of antioxidant #1, and 0.13 wt% of antioxidant #2 was kneaded at a temperature of 175°C and extruded into a film form at a temperature of about 200°C in a T-Die extruder. A portion of the film was used as a base film, and the remaining portion was supplied to an embossing roller as an air cap preliminary film to form an embossing structure.

[0242] Thereafter, before the portion where the embossed structure was formed was separated, the base film was supplied to overlap the air cap preliminary film where the embossed structure was formed, and the air cap film bonded to the base film was manufactured by pressing with a bonding roller under temperature conditions of approximately 15°C. Thereafter, biodegradable air cap was manufactured by blowing and cooling.

[0243] Example 2

[0244] A biodegradable air cap was manufactured by the same process as Example 1, except that 64.6 wt% of aliphatic-aromatic polyester resin and 10 wt% of aliphatic polyester resin were used instead of 74.6 wt% of aliphatic-aromatic polyester resin in Example 1.

[0245] Example 3

[0246] A biodegradable air cap was manufactured by the same process as Example 1, except that 64.6 wt% of aliphatic-aromatic polyester resin and 30 wt% of inorganic filler were used instead of 74.6 wt% of aliphatic-aromatic polyester resin and 20 wt% of inorganic filler in Example 1.

[0247] Example 4

[0248] A biodegradable air cap was manufactured by the same process as Example 1, except that 69.6 wt% of aliphatic-aromatic polyester resin, 10 wt% of aliphatic polyester resin, and 15 wt% of inorganic filler were used instead of 64.6 wt% of aliphatic-aromatic polyester resin, 10 wt% of aliphatic polyester resin, and 20 wt% of inorganic filler in Example 2.

[0249] Comparative Example 1

[0250] A resin composition containing 51.6 wt% of aliphatic-aromatic polyester resin, 47 wt% of inorganic filler, 0.2 wt% of chain extender, 0.4 wt% of lubricant #1, 0.6 wt% of lubricant #2, 0.07 wt% of antioxidant #1, and 0.13 wt% of antioxidant #2 was kneaded at a temperature of 175°C and extruded into a film form at a temperature of about 160°C in a T-Die extruder. A portion of the film was used as a base film, and the remaining portion was supplied to an embossing roller as an air cap preliminary film to form an embossing structure.

[0251] Thereafter, before the portion where the embossed structure was formed was separated, the base film was supplied to overlap the air cap preliminary film where the embossed structure was formed, and pressed with a bonding roller to produce an air cap film bonded to the base film. Thereafter, the biodegradable air cap was produced by blowing and cooling.

[0252] Comparative Example 2

[0253] The same process as Comparative Example 1 was used, except that the temperature conditions of the T-Die extruder in Comparative Example 1 were changed from about 160°C to about 225°C.

[0254]

[0255] Experimental example

[0256] Experimental Example 1 - Melt Index

[0257] The melt index at 190°C and 2.16 kg was measured for the resin compositions used in Examples 1 to 4 and Comparative Examples 1 to 2 according to ASTM D1238, and the results are shown in Table 1 below.

[0258]

[0259] Experimental Example 2 - Surface Energy

[0260] For the biodegradable air caps or separate samples manufactured in Examples 1 to 4 and Comparative Examples 1 to 2, the surface energy of the air cap films was measured in accordance with DIN 53364, and the results are shown in Table 1 below.

[0261]

[0262] Experimental Example 3 - Contact Angle

[0263] For the biodegradable air caps manufactured in Examples 1 to 4 and Comparative Examples 1 to 2 or separate samples, a cylinder was filled with water, about 2 μl was dropped onto the surface of the base film, and the contact angle with water was measured using DMe-210 (KYOWA). The results are shown in Table 1 below.

[0264]

[0265] Experimental Example 4 - Illumination

[0266] For the biodegradable air caps manufactured in Examples 1 to 4 and Comparative Examples 1 to 2 or separate samples, Spk (reduced peak height) and Svk (reduced valley depth) of the air cap films were measured using a three-dimensional roughness meter according to ISO 25178. The results are shown in Table 1 below.

[0267]

[0268] Experimental Example 5 - Adhesive Strength

[0269] For the biodegradable air caps or separate samples manufactured in Examples 1 to 4 and Comparative Examples 1 to 2, the adhesive strength with the base film and the air cap film was measured according to ASTM D3163, and the results are shown in Table 1 below.

[0270]

[0271] Experimental Example 6 - Coefficient of Friction

[0272] For the biodegradable air caps manufactured in Examples 1 to 4 and Comparative Examples 1 to 2 or separate samples, the coefficient of static friction of the air cap films was measured according to ASTM D1894, and the results are shown in Table 1 below.

[0273]

[0274] Experimental Example 7 - Haze

[0275] For the biodegradable air caps or separate samples manufactured in Examples 1 to 4 and Comparative Examples 1 to 2, haze was measured using a standard colorimeter according to ASTM D1003, and the results are shown in Table 1 below.

[0276]

[0277] Experimental Example 8 - Fairness

[0278] In the manufacturing processes of Examples 1 to 4 and Comparative Examples 1 to 2, the fairness was evaluated based on the following criteria, and the results are shown in Table 1 below.

[0279] ◎: Excellent adhesion between base film and air cap film

[0280] △: Presence of unbonded portions between the base film and air cap film

[0281] ×: Fusion phenomenon occurs

[0282]

[0283] Experimental Example 9 - Biodegradability

[0284] Samples were prepared from the films extruded in Examples 1 to 4 and Comparative Examples 1 to 2. Thereafter, inoculum containers containing only compost (Manufacturer: Taeheung F&G, Product Name: Jisengto (Grade 1 compost, by-product fertilizer)) were prepared. Separately, test containers were prepared in which the compost and sample were mixed at a weight ratio of 6:1 based on the dry weight of the compost. Thereafter, the inoculum containers and test containers were cultured for 180 days under the conditions of a temperature of 58±2℃, a pH of 8±1, a moisture content of 50%, and an oxygen concentration of 6% or more. Thereafter, the CO2 generated in each container was captured, and the amount of CO2 generated in each container was measured by titration with an aqueous phenolphthalein solution. Thereafter, the biodegradability of the reference (cellulose), which serves as the evaluation standard for biodegradability, was calculated according to the following equation. The biodegradability of the above samples was calculated according to the following formula, and then calculated as a relative biodegradability value based on the 100% biodegradability of the above reference. The results are shown in Table 1 below.

[0285] [ceremony]

[0286] Biodegradability (%) = [(CO2 generation in test vessel) - (CO2 generation in inoculation vessel)] / (theoretical CO2 generation in test vessel) × 100

[0287]

[0288] Experimental Example 10 - Hydrophilicity

[0289] Samples were prepared from the films extruded in Examples 1 to 4 and Comparative Examples 1 to 2. Thereafter, the initial number average molecular weight of each sample was measured under the following measurement conditions using gel permeation chromatography (GPC). Thereafter, the samples were immersed in water (100% RH) at 90°C for 15 days, and the number average molecular weight of each sample was measured. The change rate of the number average molecular weight after immersion compared to the initial number average molecular weight is shown in Table 1 below. It was determined that the smaller the change rate of the number average molecular weight, the better the hydrophilicity.

[0290] [Measurement conditions]

[0291] - Device: APC system (Waters)

[0292] - Column: Acquity APC XT Column 45A (4.6+150mm)x2

[0293] - Mobile phase: THF

[0294] - Flow rate: 0.5mL / min

[0295] - Sample concentration: 10mg / 10mL

[0296] - Injection volume: 10 ㎕

[0297] - Detector: RID 40 ℃

[0298] - Total driving time: 10 minutes

[0299]

[0300] Experimental Example 11 - Tensile strength and elongation at break

[0301] For the biodegradable air caps or separate samples manufactured in Examples 1 to 4 and Comparative Examples 1 to 2, tensile strength and elongation at break were measured five times each at room temperature using a universal testing machine (4206-001, manufacturer: UTM) from INSTRON at a test speed of 200 mm / min in accordance with ASTM D882, and the average values ​​for each are shown in Table 1 below.

[0302]

[0303] Classification Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 1) Melt index 2.5 g / 10 min 3 g / 10 min 2 g / 10 min 2.8 g / 10 min 5.5 g / mol 5.5 g / mol Surface energy 28 mN / m 2 6 mN / m 2 9 mN / m 2 7 mN / m 3 4 mN / m - Contact angle 95° 105° 97° 100° 75° - Roughness Spk 2.5 5 1.60 7 1.67 4 2.22 3 2.55 5 - Svk 0.64 6 0.49 3 0.60 4 0.65 2 1.90 2 - Spk / Spk 3.9 5 5 3.26 0 2.77 2 3.4 10 1.34 3 - Adhesive strength 1.4 kgf / mm2 1.6 kgf / mm 2 1.4 kgf / mm 2 1.5 kgf / mm 2 1.0 kgf / mm 2 -Friction coefficient 0.13 0.15 0.15 0.14 0.37 -Haze 6 % 7 % 10 % 9 % 40 % -Fairness ◎◎◎◎△ ×Biodegradability 92 % 90 % 93 % 90 % 93 % -Hydrolysis resistance 35.12 % 33.27 % 35.02 % 34.88 % 44.22 % -Tensile strength 40 MPa 42 MPa 35 MPa 37 MPa 15 MPa -Elongation at break 300 % 305 % 230 % 255 % 80 % -1) Comparative example 2: The resin was not extruded into a film form with an embossed structure

[0304]

[0305] As can be confirmed in Table 1 above, the biodegradable resin compositions according to Examples 1 to 4 and the biodegradable air caps comprising the same have improved adhesive properties and water resistance compared to the biodegradable resin compositions according to Comparative Examples 1 to 2 and the biodegradable air caps comprising the same, and it was confirmed that they have excellent processability and mechanical properties.

[0306]

[0307] The embodiment can be applied to a biodegradable resin composition for an air cap and a biodegradable air cap comprising the same.

Claims

1. Biodegradable resin comprising aliphatic-aromatic polyester resin; Weapon refill; Sleep aid; and A biodegradable resin composition for air caps containing a chain extender.

2. In paragraph 1, A biodegradable resin composition for air cap, wherein the content of the inorganic filler is 10 wt% to 40 wt% based on the total weight of the biodegradable resin composition for air cap.

3. In paragraph 1, The above inorganic filler has an average particle diameter (D 50 ) is 1 ㎛ to 2 ㎛, and the span (D 90 -D 10 / D 50 ) A biodegradable resin composition for air cap containing calcium carbonate having an amount of 4 or less.

4. In paragraph 1, A biodegradable resin composition for air cap, wherein the content of the slip agent is 1 wt% to 10 wt% based on the total weight of the biodegradable resin composition for air cap.

5. In paragraph 1, A biodegradable resin composition for air cap, wherein the above slip agent is derived from a slip agent masterbatch.

6. In paragraph 5, A biodegradable resin composition for air cap, wherein the above slip agent masterbatch further comprises an anti-blocking agent.

7. In paragraph 1, A biodegradable resin composition for aircap, wherein the content of the chain extender is 0.1 wt% to 1 wt% based on the total weight of the biodegradable resin composition for aircap.

8. In paragraph 1, A biodegradable resin composition for air caps, wherein the biodegradable resin further comprises an aliphatic polyester resin.

9. In paragraph 1, The biodegradable resin composition for the air cap is a biodegradable resin composition for the air cap having a melt index of 1 g / 10 min to 5 g / 10 min at 190° C. and 2.16 kg according to ASTM D1238.

10. Biodegradable resin comprising aliphatic-aromatic polyester resin; Weapon refill; Sleep aid; and Biodegradable air cap containing chain extender.

11. In paragraph 10, The above biodegradable air cap comprises a base film and an air cap film laminated to at least one side of the base film, The above aircap film is a biodegradable aircap having a surface energy of 30 mN / m or less according to DIN 53364.

12. In paragraph 11, The above base film is a biodegradable air cap having a contact angle with water of 80° to 120°.

13. In paragraph 11, A biodegradable air cap having an Spk (reduced peak height) / Svk (reduced valley depth) of 1.5 or more according to ISO 25178 when the above air cap film is measured using a three-dimensional roughness measuring device.

14. In paragraph 11, The adhesive strength between the base film and the air cap film is 1.2 kgf / mm 2 Biodegradable air cap that is in excess.

15. In paragraph 10, The above biodegradable air cap is a biodegradable air cap having a haze of more than 1% and less than 50% according to ASTM D1003 when measured using a standard colorimeter.

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