Method of encapsulating poly(alkylene carbonate) and mixture particles thereof, and use thereof

Abstract

The present invention relates to a poly(alkylene carbonate) capsule in which a heterogeneous resin is applied on a surface of poly(alkylene carbonate), and a method of manufacturing the same, and provides a poly(alkylene carbonate) capsule preventing blocking where particles agglomerate each other when a resin having surface stickiness at a glass transition temperature or higher is processed in a pellet or chip state and circulated, and a method of manufacturing the same.

Claims

1. A poly(propylene carbonate) capsule in which a dissolved heterogeneous resin satisfying the following Equations 1 and 2 is applied on a surface of poly(propylene carbonate):
70T270[Equation 1]
5,000Mw200,000[Equation 2], wherein T represents a melting point or a softening point in C., and Mw represents a weight average molecular weight in g/mol, and wherein the heterogeneous resin is one or a mixture of two or more selected from, poly(butylene adipate-co-butylene-terephthalate), poly(butylene succinate), poly(butylene succinate-co-butylene adipate), cellulose acetate, triacetate cellulose, polyvinylpyrrolidone, starch, styrenebutadienestyrene, acrylonitrilebutadienestyrene, styrenemaleic anhydride, polylactic acid, and a copolymer of lactide-glycolide.

2. The poly(alkylene carbonate) capsule of claim 1, wherein the poly(alkylene carbonate) includes one or a multiple polymer of two or more selected from ethylene oxide, propylene oxide, glycidyl alkyl ether, glycidyl acrylate, and diglycidyl ether.

3. The poly(alkylene carbonate) capsule of claim 1, wherein 0.5 to 10 parts by weight of the heterogeneous resin is included based on 100 parts by weight of the poly(alkylene carbonate).

4. A poly(propylene carbonate) capsule in which a dissolved heterogeneous resin is applied on a surface of poly(propylene carbonate), wherein the heterogeneous resin is one or a mixture of two or more selected from polyamide, poly(butylene adipate-co-butylene-terephthalate), poly(butylene succinate), poly(butylene succinate-co-butylene adipate), cellulose acetate, triacetate cellulose, polyvinylpyrrolidone, styrenebutadienestyrene, acrylonitrilebutadienestyrene, styrenemaleic anhydride, polylactic acid, and a copolymer of lactide-glycolide.

Description

(1) Hereinafter, the present invention will be described in more detail by the following Examples. However, the following Examples are set forth to illustrate but are not to limit the present invention.

EXAMPLE 1

Manufacturing of the Resin Solution

(2) 1) Poly(butylene adipate-co-butylene-terephthalate) (molecular weight: 130,000 g/mole, MP: 120 C.) was dissolved in a concentration of 5% in methylene chloride at 50 C. and then stored in a bottle with a cap.

(3) 2) Poly(butylene succinate) (molecular weight: 70,000 g/mole, MP: 113 C.) was dissolved in a concentration of 3% in methylene chloride at 50 C. and then stored in a bottle with a cap.

(4) 3) Poly(butylene succinate-co-butylene adipate) (molecular weight: 80,000 g/mole, MP: 105 C.) was dissolved in a concentration of 3% in methylene chloride at 50 C. and then stored in a bottle with a cap.

(5) 4) Cellulose acetate (molecular weight: 70,000 g/mole, MP: 220 C.) was dissolved in a concentration of 3% in acetone at 50 C. and then stored in a bottle with a cap.

(6) 5) Triacetate cellulose (molecular weight: 80,000 g/mole, MP: 260 C.) was dissolved in a concentration of 3% in acetone at 50 C. and then stored in a bottle with a cap.

(7) 6) Poly(methyl methacrylate) (molecular weight: 300,000 g/mole, MP: 160 C.) was dissolved in a concentration of 3% in acetone at 50 C. and then stored in a bottle with a cap.

(8) 7) Polyvinyl pyrrolidone (molecular weight: 40,000 g/mole, MP: 150 C.) was dissolved in a concentration of 3% in ethanol at 50 C. and then stored in a bottle with a cap.

(9) 8) Polyvinyl pyrrolidone (molecular weight: 40,000 g/mole, MP: 150 C.) was dissolved in a concentration of 5% in water at 50 C., ethanol was added to perform dilution to a concentration of 3%, 0.1% of polyoxyethylene was added, and the resulting material was stored in a bottle with a cap.

(10) 9) Polyvinyl alcohol acetate (molecular weight: 100,000 g/mole, SP: 70 C.) was dissolved in a concentration of 3% in ethanol at 50 C. and then stored in a bottle with a cap.

(11) 10) Polyvinyl alcohol (molecular weight: 80,000 g/mole, MP: 200 C.) was dissolved in a concentration of 5% in water at 50 C., dilution was performed by ethanol to a concentration of 3%, 0.1% of polyoxyethylene having a molecular weight of 400 g/mole was added and agitated well, surface tension was adjusted to 50 dyne/cm or less, and the resulting material was stored in a bottle with a cap.

(12) 11) Starch (molecular weight: 200,000 g/mole, SP: 80 C.) was dissolved in a concentration of 3% in water at 50 C., 0.1% of polyoxyethylene having the molecular weight of 400 g/mole was added, and the resulting material was stored in a bottle with a cap.

(13) 12) Styrenebutadienestyrene (molecular weight: 150,000 g/mole, SP: 150 C.) was dissolved in a concentration of 3% in toluene at 50 C. and then stored in a bottle with a cap.

(14) 13) Acrylonitrilebutadienestyrene (molecular weight: 200,000 g/mole, SP: 150 C.) was dissolved in a concentration of 3% in toluene at 50 C. and then stored in a bottle with a cap.

(15) 14) Styrenemaleic anhydride (molecular weight: 200,000 g/mole, SP: 120 C.) was dissolved in a concentration of 3% in toluene at 50 C. and then stored in a bottle with a cap.

(16) 15) Ethylenemaleic anhydride (molecular weight: 200,000 g/mole, SP: 250 C.) was dissolved in a concentration of 3% in toluene at 50 C. and then stored in a bottle with a cap.

(17) 16) Polyamide (manufacturing company: Thomas Swan & Co., Ltd. (UK), product name: CASAMID 878, SP: 150 C.) was dissolved in a concentration of 4% in ethanol at 50 C. and then stored in a bottle with a cap.

EXAMPLE 2

(18) Poly(propylene carbonate) having the weight average molecular weight of 150,000 g/mol was extruded in the extruder and, at the same time, passed at a speed of 10 m/min while being immersed in resin solution 1) of Example 1, and passed through the air curtain at 40 C. to form a dried coat film. The strand on which the coat film was applied was used to manufacture pellets by using the pelletizer. A load of 250 g/cm.sup.2 was applied to the coated pellet, the pellet was left at 70 C. for 24 hours, and it was confirmed whether blocking occurred or not.

EXAMPLE 3

(19) The coat film was formed and the pellet was manufactured by using resin solution 2) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 4

(20) The coat film was formed and the pellet was manufactured by using resin solution 3) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 5

(21) The coat film was formed and the pellet was manufactured by using resin solution 4) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 6

(22) The coat film was formed and the pellet was manufactured by using resin solution 5) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 7

(23) The coat film was formed and the pellet was manufactured by using resin solution 6) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 8

(24) The coat film was formed and the pellet was manufactured by using resin solution 7) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 9

(25) The coat film was formed and the pellet was manufactured by using resin solution 8) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 10

(26) The coat film was formed and the pellet was manufactured by using resin solution 9) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 11

(27) The coat film was formed and the pellet was manufactured by using resin solution 10) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 12

(28) The coat film was formed and the pellet was manufactured by using resin solution 11) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 13

(29) The coat film was formed and the pellet was manufactured by using resin solution 12) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 14

(30) The coat film was formed and the pellet was manufactured by using resin solution 13) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 15

(31) The coat film was formed and the pellet was manufactured by using resin solution 14) of Example 1 as the solution in Example 2, and the blocking test was performed.

EXAMPLE 16

(32) Manufacturing was performed by the same method as Example 2, the coat film was formed and the pellet was manufactured by resin solution 15) of Example 1, and the blocking test was performed.

EXAMPLE 17

(33) Manufacturing was performed by the same method as Example 2, die-face cutting was performed while performing extrusion into resin solution 8) of Example 1 to manufacture the pellet, and the blocking test was performed.

EXAMPLE 18

(34) Manufacturing was performed by the same method as Example 17, the coat film was formed and the pellet was manufactured by resin solution 10) of Example 1, and the blocking test was performed.

EXAMPLE 19

(35) Manufacturing was performed by the same method as Example 17, the coat film was formed and the pellet was manufactured by resin solution 11) of Example 1, and the blocking test was performed.

EXAMPLE 20

(36) Manufacturing was performed by the same method as Example 17, poly(ethylene carbonate) having the weight average molecular weight of 200,000 g/mole was used instead of poly(propylene carbonate) to manufacture the pellet, and the blocking test was performed.

EXAMPLE 21

(37) Manufacturing was performed by the same method as Example 17, poly(propylene carbonate) and PBAT were mixed at a weight ratio of 1:1 instead of poly(propylene carbonate) to manufacture the extruded pellet, coating was performed, and the blocking test was performed.

EXAMPLE 22

(38) Manufacturing was performed by the same method as Example 2, the coat film was formed and the pellet was manufactured by resin solution 16) of Example 1, and the blocking test was performed.

COMPARATIVE EXAMPLE 1

(39) The pellet having the weight average molecular weight of 150,000 g/mole was manufactured without a coating step, and the blocking test was performed.

(40) The blocking test results of Examples 2 to 22 and Comparative Example 1 are described in Table 1. In the blocking test, under a condition of a load of 250 g/cm.sup.2 and a temperature of 70 C., the case where the pellet particles were separated from each other was represented by the term none, and the case where the pellet particles agglomerated each other to form one lump and were not separated from each other was represented by the term occurrence. Further, it could be seen that blocking did not occur under the condition of the load of 30 g/cm.sup.2 and the temperature of 100 C. for 12 hours.

(41) TABLE-US-00001 TABLE 1 Results of the blocking test at a load of 250 g/cm.sup.2 and a temperature of 70 C. Occurrence of blocking Example 2 None Example 3 None Example 4 None Example 5 None Example 6 None Example 7 None Example 8 None Example 9 None Example 10 None Example 11 None Example 12 None Example 13 None Example 14 None Example 15 None Example 16 None Example 17 None Example 18 None Example 19 None Example 20 None Example 21 None Example 22 None Comparative Example 1 Occurrence

(42) From the blocking test results, it was confirmed that the encapsulating method by coating of the surface of poly(alkylene carbonate) of the present invention could prevent blocking at the glass transition temperature or higher to ensure convenience in the course of transporting and storing.

(43) Further, poly(alkylene carbonate) of Examples 2 to 22 and Comparative Example 1 manufactured by the present invention were used to manufacture a casting film by extrusion, a sheet was manufactured by the calendar method, mechanical properties (tensile stress and tensile strain) were measured based on ASTM D638, and the results are described in Table 2.

(44) TABLE-US-00002 TABLE 2 Measurement results of tensile stress and tensile strain after coating Tensile stress Tensile strain (MPa) (%) Example 2 30.42 20 Example 3 31.10 25 Example 4 29.13 25 Example 5 29.53 30 Example 6 28.3 30 Example 7 29.1 15 Example 8 29.84 20 Example 9 31.12 10 Example 10 30.3 20 Example 11 33.12 20 Example 12 32.13 10 Example 13 28.88 20 Example 14 31.19 30 Example 15 31.56 10 Example 16 29.6 10 Example 17 30.5 20 Example 18 31.6 20 Example 19 28.97 20 Example 20 29.5 20 Example 21 29.76 30 Example 22 29.10 10 Comparative 29.03 20 Example 1

(45) As described in Table 2, the poly(alkylene carbonate) sheet of Examples 2 to 22 manufactured by the present invention had tensile stress and tensile strain that were hardly different from those of the sheet of Comparative Example 1 without the coating step of the heterogeneous resin, and thus it was confirmed that there was no difference in mechanical properties of poly(alkylene carbonate) even though the coating layer of the heterogeneous resin was present. Accordingly, it could be seen that an effect to a post-processing process was minimized by selecting the heterogeneous resin having partial compatibility with poly(alkylene carbonate).

(46) As described above, the preferable exemplary embodiments of the present invention have been described in detail, but the person with ordinary skill in the art to which the present invention belongs may make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof, which do not depart from the spirit and scope of the present invention defined by the accompanied claims. Therefore, it should be understood that the present invention is not limited to the aforementioned embodiments.