Resin composition having excellent thermal stability and low glass transition temperature, and application thereof

Abstract

The present invention relates to a resin composition and application thereof, the resin composition comprising amorphous poly alpha olefin (APAO) and isotactic polypropylene, wherein the amorphous poly alpha olefin is a copolymer obtained by polymerizing propylene and an alpha olefin monomer, other than propylene, having 2 to 20 carbon atoms, and the isotactic polypropylene has a glass transition temperature of -30℃ or less and a softening point of 150℃ or higher.

Description

Resin composition with excellent thermal stability and low glass transition temperature and its application

[0001] The present invention relates to a resin composition having excellent thermal stability and a low glass transition temperature and its application.

[0002] Amorphous poly alpha olefin (APAO) hot melt adhesives are primarily used for the assembly of components such as automobiles, filters, furniture, and batteries. Their high softening point and low glass transition temperature make them ideal for applications requiring both heat and cold resistance. Their odorlessness also makes them suitable for applications such as air filters. Their adhesion to non-polar surfaces, such as polyethylene and polypropylene, is particularly superior to that of other resins.

[0003] Conventional general-purpose APAO hot melt adhesives are typically composed of an amorphous polyalphaolefin as a base resin and wax or the like added as a tackifier or viscosity modifier. However, when the tackifier and wax are mixed with an amorphous polyalphaolefin resin, the adhesive strength and thermal stability are improved, but there is a disadvantage of reduced low-temperature flexibility.

[0004] Accordingly, there is a need to develop a base resin that can maintain excellent low-temperature flexibility while improving thermal safety.

[0005] Meanwhile, a similar prior art document on this subject is presented in Korean Patent Publication No. 10-1174019.

[0006] (Patent Document 1) Republic of Korea Patent Publication No. 10-1174019 (August 8, 2012)

[0007] In order to solve the above problems, the present invention aims to provide a resin composition having excellent low-temperature flexibility by having a low glass transition temperature while having excellent thermal stability.

[0008] However, the above purpose is exemplary, and the technical idea of ​​the present invention is not limited thereto.

[0009] One aspect of the present invention for achieving the above object relates to a resin composition comprising an amorphous poly alpha olefin (APAO) and an isotactic polypropylene, wherein the amorphous poly alpha olefin is a terpolymer of ethylene-propylene-1-butene, and the isotactic polypropylene has a glass transition temperature of -30°C or lower and a softening point of 150°C or higher.

[0010] In the above aspect, the resin composition may have a weight ratio of amorphous polyalpha olefin: isotactic polypropylene of 100:1 to 30.

[0011] In the above aspect, the amorphous polyalpha olefin may have a melting viscosity of 1,000 to 200,000 cps at 190°C, a softening point of 100°C or higher, a glass transition temperature of -10°C or lower, and a needle penetration degree of 55 dmm or lower.

[0012] In the above aspect, the isotactic polypropylene may have a melt flow rate (MFR, 230°C, 2.16 kg) of 5 to 100 g / 10 min, and a glass transition temperature of -30°C or lower.

[0013] In the above aspect, the resin composition may have a glass transition temperature of -15°C or lower and a softening point of 150°C or higher, and a needle penetration degree of 35 dmm or lower.

[0014] In addition, another aspect of the present invention relates to the application of a resin composition, characterized in that the above-described resin composition is applied to a hot melt adhesive.

[0015] The resin composition according to the present invention can have excellent low-temperature flexibility by maintaining or improving a low glass transition temperature by mixing isotactic polypropylene into an amorphous polyalpha olefin, which is a terpolymer of ethylene-propylene-1-butene, while increasing the softening point to have excellent thermal stability.

[0016] Hereinafter, a resin composition having excellent thermal stability and a low glass transition temperature according to the present invention and its applications will be described in detail. In this context, unless otherwise defined, technical and scientific terms used herein have the meaning commonly understood by those of ordinary skill in the art to which this invention pertains. In the following description and accompanying drawings, descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted.

[0017] One aspect of the present invention relates to a resin composition comprising an amorphous polyalpha olefin (APAO) and an isotactic polypropylene, wherein the amorphous polyalpha olefin is a terpolymer of ethylene-propylene-1-butene, and the isotactic polypropylene has a glass transition temperature of -30°C or lower and a softening point of 150°C or higher.

[0018] In this way, the resin composition according to the present invention can have excellent low-temperature flexibility by maintaining or improving a low glass transition temperature by mixing isotactic polypropylene into an amorphous polyalpha olefin, which is a terpolymer of ethylene-propylene-1-butene, while increasing the softening point to have excellent thermal stability.

[0019] As a specific example, a resin composition according to an embodiment of the present invention may have a glass transition temperature of -15°C or lower and a softening point of 150°C or higher, more preferably a glass transition temperature of -20°C or lower and a softening point of 155°C or higher, and even more preferably a glass transition temperature of -25°C or lower and a softening point of 160°C or higher. With such a low glass transition temperature, the resin composition may have excellent low-temperature flexibility, and with a high softening point, it may have excellent thermal stability. At this time, the glass transition temperature (Tg) may be measured by differential scanning calorimetry (DSC) and the lower limit may be -70°C, and the softening point may be measured according to ASTM E 28 & D36 and the upper limit may be 180°C, but is not necessarily limited thereto.

[0020] In addition, the resin composition according to an example of the present invention may have a needle penetration of 35 dmm or less, more preferably 25 dmm or less, and even more preferably 15 dmm or less. In this case, the needle penetration is measured according to ASTM D 1321, and the lower limit may be 3 dmm. When the needle penetration is low, it may be applicable to products that require properties such as high hardness and tensile strength, and when the needle penetration is high, it may be applicable to products that require properties such as high elongation and softness.

[0021] In addition, the viscosity of the resin composition according to one example of the present invention at 190°C may be 10,000 cps or more, more preferably 15,000 cps or more, and even more preferably 20,000 cps or more. With such a high viscosity, the resin composition may not easily flow, and has the advantage of being easy to control workability.

[0022] Hereinafter, each component of the resin composition according to an example of the present invention will be described in more detail.

[0023] In one example of the present invention, the amorphous poly alpha olefin (APAO) is an essentially soft poly alpha olefin having a low crystallinity, for example, a low crystallinity of 5% or less, and an amorphous poly alpha olefin suitable for the present invention may be an ethylene-propylene-1-butene terpolymer.

[0024] More specifically, the amorphous polyalpha olefin suitable for the present invention may have a melting viscosity at 190°C of 1,000 to 200,000 cps, more preferably 3,000 to 180,000 cps, still more preferably 5,000 to 100,000 cps, and still more preferably 7,000 to 50,000 cps. In addition, the amorphous polyalpha olefin may have a softening point of 90°C or higher, more preferably 95°C or higher, and still more preferably 100°C or higher. In addition, the glass transition temperature may be -10℃ or lower, more preferably -15℃ or lower, and even more preferably -20℃ or lower, and the needle penetration may be 55 dmm or lower, specifically 5 to 55 dmm, more preferably 10 to 50 dmm, and even more preferably 15 to 30 dmm. When isotactic polypropylene satisfying the properties described below is mixed in an appropriate ratio within these ranges, excellent low-temperature stability and heat stability can be secured. At this time, the glass transition temperature (Tg) may be measured by differential scanning calorimetry (DSC) and the lower limit may be -50℃, the softening point may be measured according to ASTM E 28 & D36 and the upper limit may be 180℃, and the needle penetration may be measured according to ASTM D 1321.

[0025] In one embodiment of the present invention, the isotactic polypropylene is a crystalline polypropylene in an isotactic form in which methyl groups are bonded in only one direction. Specifically, for example, the isotactic polypropylene may have a melt flow rate (MFR, 230°C, 2.16 kg) of 5 to 100 g / 10 min, more preferably 10 to 80 g / 10 min, and even more preferably 15 to 50 g / 10 min, and a glass transition temperature of -30°C or lower, more preferably -40°C or lower, and even more preferably -45°C or lower. In this range, the low-temperature flexibility and thermal stability of the resin composition can be more effectively improved. In addition, by mixing isotactic polypropylene having a melt flow rate of 5 to 100 g / 10 min into the amorphous poly alpha olefin, the resin composition can have a high viscosity, which can be efficient when the resin composition needs to be fixed and worked. At this time, the melt flow rate can be measured according to ASTM D1238, and the glass transition temperature (Tg) can be measured by differential scanning calorimetry (DSC) and the lower limit can be -75°C.

[0026] As a preferred example, the isotactic polypropylene suitable for the present invention may be a thermoplastic polyolefin (RTPO) manufactured in a reactor. The thermoplastic polyolefin manufactured in a reactor is prepared by dispersing ethylene-propylene rubber (EPR) in the polyolefin during polymerization in the reactor, and may be added to improve the softening point of the resin composition and simultaneously maintain or improve low-temperature flexibility. The thermoplastic polyolefin manufactured in the reactor may have superior heat resistance and impact strength properties because it is blended in the reactor, unlike the conventional post-blending of pre-polymerized polyolefin and ethylene-propylene rubber.

[0027] Preferably, the thermoplastic polyolefin produced in the reactor may be one in which ethylene-propylene rubber is dispersed in isotactic polypropylene during polymerization in the reactor, and the content of the ethylene-propylene rubber may be 10 to 40 wt%. In this range, the effect of improving thermal stability may be excellent.

[0028] In addition, the thermoplastic polyolefin manufactured in a reactor suitable for the present invention may have a melt flow rate (MFR, 230°C, 2.16 kg) of 5 to 100 g / 10 min, more preferably 10 to 80 g / 10 min, and even more preferably 15 to 50 g / 10 min, and a glass transition temperature of -30°C or lower, more preferably -40°C or lower, and even more preferably -45°C or lower. In this range, the low-temperature flexibility and thermal stability of the resin composition can be more effectively improved. In addition, since the thermoplastic polyolefin manufactured in a reactor having a melt flow rate of 5 to 100 g / 10 min is mixed with the amorphous poly alpha olefin, the resin composition can have a high viscosity, which can be efficient when the resin composition needs to be fixed and worked. At this time, the melt flow rate may be measured according to ASTM D1238, and the glass transition temperature (Tg) may be measured by differential scanning calorimetry (DSC), and the lower limit may be -75°C.

[0029] Meanwhile, in order to secure a resin composition having excellent properties as described above, it is preferable to mix the amorphous polyalpha olefin and isotactic polypropylene at an appropriate ratio. Specifically, for example, the resin composition may have a weight ratio of amorphous polyalpha olefin:isotactic polypropylene of 100:1 to 30, more preferably 100:5 to 25, and even more preferably 100:10 to 25. In this range, superior low-temperature stability and heat stability characteristics can be secured.

[0030] In addition, another aspect of the present invention relates to the application of a resin composition, characterized by applying the aforementioned resin composition to a hot melt adhesive. When the aforementioned resin composition is applied as a base resin for a hot melt adhesive, a hot melt adhesive can be obtained that maintains excellent adhesive strength while also exhibiting improved low-temperature flexibility and thermal stability.

[0031] The above resin composition can be used in an amount of 50 to 90 wt% of the total weight of the hot melt adhesive, more preferably 60 to 80 wt%, and even more preferably 65 to 75 wt%. Within this range, superior adhesive strength, low-temperature flexibility, and thermal stability can be secured.

[0032] In addition, the hot melt adhesive may further include functional additives commonly used in the art, and as a non-limiting example, the functional additives may further include one or more selected from the group consisting of tackifiers and waxes. Such functional additives may be used in an amount of 10 to 50 wt% of the total weight of the hot melt adhesive, more preferably 20 to 40 wt%, and even more preferably 25 to 35 wt%.

[0033]

[0034] Hereinafter, the resin composition with excellent thermal stability and low glass transition temperature according to the present invention and its applications will be described in more detail through examples. However, the following examples are merely references for explaining the present invention in detail and are not intended to limit the present invention, which may be implemented in various forms.

[0035] Additionally, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is solely for the purpose of effectively describing specific embodiments and is not intended to limit the invention. Furthermore, the unit of additives not specifically described in the specification may be weight percent.

[0036] [Characteristic evaluation method]

[0037] 1) Melting viscosity (cps): Brookfield viscosity at 190℃ was measured according to ASTM D 3236-15.

[0038] 2) Glass transition temperature (℃): Refers to the value measured by differential scanning calorimetry (DSC). Specifically, the measurement was performed at a heating rate of 10℃ / min in accordance with ASTM D 3417.

[0039] 3) Softening point (Ring and Ball Softening Point, RBSP, ℃): Measured according to ASTM E 28 & D36.

[0040] 4) Needle Penetration (NP, dmm): Needle penetration was measured according to ASTM D 1321.

[0041] [Examples 1 to 12]

[0042] As shown in Table 1 below, a resin composition was prepared by mixing amorphous polyalphaolefin (APAO-1 or APAO-2) and thermoplastic polyolefin (RTPO) produced in a reactor.

[0043] * APAO-1: Ethylene-propylene-1-butene, melting viscosity at 190℃ 10,440 cps, glass transition temperature -30.5℃, softening point 106.7℃, needle penetration 16.5 dmm

[0044] * APAO-2: Ethylene-propylene-1-butene, melting viscosity at 190℃ 47,600 cps, glass transition temperature -29℃, softening point 104.7℃, needle penetration 16.4 dmm

[0045] * RTPO: Melt flow rate (230℃, 2.16㎏) 21 g / 10 min, glass transition temperature -48.75℃, softening point 191℃

[0046] [Comparative Examples 1 and 2]

[0047] As shown in Table 1 below, APAO was used as is without mixing RTPO into APAO-1 or APAO-2.

[0048] Base resin (weight part) Characteristic evaluation APAORTPO Viscosity (cps) Tg (℃) RBSP (℃) NP (dmm) Example 1 APAO-1, ​​100 5 14, 120-30 156.7 12.9 Example 2 APAO-1, ​​100 10 18, 580-29.7 166.5 10 Example 3 APAO-1, ​​100 15 23, 150-29.1 167.3 8.4 Example 4 APAO-1, ​​100 20 29, 750-28.9 168 7.6 Example 5 APAO-1, ​​100 25 36, 200-28.9 168.4 7.4 Example 6 APAO-2, 100 5 57, 340-29 157.4 13.4 Example 7APAO-2, 1001071,650-28.6167.910.4Example 8APAO-2, 1002087,180-28.1168.18.9Example 9APAO-2, 10025121,000-28.1169.67.6Example 10APAO-2, 10030172,350-281707.3Comparative Example 1APAO-1, ​​100010,440-30.5106.716.5Comparative Example 2APAO-2, 100047,600-29104.716.4

[0049] Referring to Table 1 above, it was confirmed that when RTPO was mixed in an appropriate amount into APAO according to the present invention, the softening point increased to 160°C or more, thereby improving thermal stability, and the glass transition temperature was hardly lowered, thereby maintaining excellent low-temperature flexibility.

[0050] [Application Example 1]

[0051] A hot melt adhesive was prepared by mixing 20 wt% of a tackifier (trade name H130W) and 10 wt% of a wax (trade name AC 820A, polyethylene wax) with 70 wt% of the resin composition prepared in Example 3.

[0052] Hot melt adhesive was applied to a Kraft paper or polyethylene terephthalate (PET) film at a certain thickness, and the Kraft paper was pressed at 190°C for 20 seconds, and the PET was pressed at 190°C for 15 seconds. The adhesive strength was evaluated by performing a peel test using a Universal Testing Machine (UTM) according to ASTM D1876-08.

[0053] As a result, the adhesion to kraft paper was measured at 2,662 gf / g, and the adhesion to PET was measured at 7,400 gf / g.

[0054] [Application Example 2]

[0055] A hot melt adhesive was prepared by mixing 20 wt% of a tackifier (trade name H130W) and 10 wt% of a wax (trade name AC 820A, polyethylene wax) with 70 wt% of the resin composition prepared in Example 4.

[0056] Hot melt adhesive was applied to a Kraft Paper or Polyethylene Terephthalate (PET) film at a certain thickness, pressed at 190°C for 7 seconds, and then a peel test was performed using a Universal Testing Machine (UTM) according to ASTM D1876-08 to evaluate the adhesive strength.

[0057] As a result, the adhesion to kraft paper was measured at 2,138 gf / g, and the adhesion to PET was measured at 5,900 gf / g.

[0058] [Application Example 3]

[0059] A hot melt adhesive was prepared by mixing 20 wt% of a tackifier (trade name H130W) and 10 wt% of a wax (trade name AC 820A, polyethylene wax) with 70 wt% of the resin composition prepared in Example 8.

[0060] Hot melt adhesive was applied to a Kraft Paper or Polyethylene Terephthalate (PET) film at a certain thickness, pressed at 190°C for 7 seconds, and then a peel test was performed using a Universal Testing Machine (UTM) according to ASTM D1876-08 to evaluate the adhesive strength.

[0061] As a result, the adhesion to kraft paper was measured at 1,952 gf / g, and the adhesion to PET was measured at 19,200 gf / g.

[0062] [Application Example 4]

[0063] A hot melt adhesive was prepared by mixing 20 wt% of a tackifier (trade name H130W) and 10 wt% of a wax (trade name AC 820A, polyethylene wax) with 70 wt% of the resin composition prepared in Example 9.

[0064] Hot melt adhesive was applied to a Kraft Paper or Polyethylene Terephthalate (PET) film at a certain thickness, pressed at 190°C for 7 seconds, and then a peel test was performed using a Universal Testing Machine (UTM) according to ASTM D1876-08 to evaluate the adhesive strength.

[0065] As a result, the adhesion to kraft paper was measured at 1,805 gf / g, and the adhesion to PET was measured at 16,567 gf / g.

[0066] Although the present invention has been described through specific matters and limited examples as described above, these are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above examples, and those skilled in the art to which the present invention pertains can make various modifications and variations based on this description.

[0067] Therefore, the idea of ​​the present invention should not be limited to the described embodiments, and all things that are equivalent or equivalent to the following claims as well as the claims are considered to fall within the scope of the idea of ​​the present invention.

Claims

1. A resin composition comprising amorphous polyalphaolefin (APAO) and isotactic polypropylene, The above amorphous polyalpha olefin is a terpolymer of ethylene-propylene-1-butene, A resin composition characterized in that the above isotactic polypropylene has a glass transition temperature of -30°C or lower and a softening point of 150°C or higher.

2. In paragraph 1, A resin composition characterized in that the weight ratio of amorphous polyalpha olefin: isotactic polypropylene is 100:1 to 30.

3. In paragraph 1, A resin composition characterized in that the above amorphous polyalpha olefin has a melting viscosity of 1,000 to 200,000 cps at 190°C.

4. In paragraph 3, A resin composition characterized in that the above amorphous polyalpha olefin has a softening point of 100°C or higher.

5. In paragraph 4, A resin composition characterized in that the above amorphous poly alpha olefin has a glass transition temperature of -10°C or lower.

6. In paragraph 5, A resin composition, characterized in that the above amorphous polyalpha olefin has a needle penetration of 55 dmm or less.

7. In paragraph 1, A resin composition characterized in that the above isotactic polypropylene has a melt flow rate (MFR, 230°C, 2.16 kg) of 5 to 100 g / 10 min.

8. In paragraph 7, A resin composition characterized in that the above isotactic polypropylene has a glass transition temperature of -30°C or lower.

9. In paragraph 1, The resin composition is characterized in that the above resin composition has a glass transition temperature of -15°C or lower and a softening point of 150°C or higher.

10. In paragraph 1, A resin composition characterized in that the above resin composition has a needle penetration degree of 35 dmm or less.

11. Application of a resin composition, characterized in that any one of the resin compositions selected from clauses 1 to 10 is applied to a hot melt adhesive.