Resin pellet and method for producing the same

a technology of resin pellets and resin powders, applied in the field of resin pellets, can solve the problems of easy dislocation of resin powder layers on copolymerized polyester resins, limited storage of resin pellets, and frequent blockage of resin pellets, so as to achieve effective suppression of blocking, reduce contact area of resin pellets, and reduce the effect of blocking

Inactive Publication Date: 2012-04-12
MITSUI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]According to the present invention, a plurality of microparticles are embedded in the resin base material and the surface of the resin base material is covered with the microparticles. In this way, concavity and convexity are formed in the surface of the resin pellet while preventing detachment of microparticles from the resin base material. Accordingly, the contact area of resin pellets may be decreased, and blocking may be effectively suppressed.
[0024]By selecting a material having a softening temperature or melting point higher than that of the resin constituting the resin base material as microparticles, the resin base material to be a core such as a core-shell structure may be protected even at a temperature higher than the softening temperature of the resin base material.
[0025]According to the present invention, blocking of resin pellets is effectively suppressed. That is, blocking of resin pellets is effectively controlled even though resin pellets are stored or preserved at a high temperature.
[0026]As another effect in a preferred aspect, anti-adhesive microparticles to be applied on the surface of the resin base material are not detached even though they are transported by air in the pipe.
[0027]As still another effect, since resin pellets can be dried at a high temperature, the volatile component contained in the resin pellets may be removed in a short period of time. Accordingly, the time until the resin pellets having a volatile component in a small amount are shipped may be reduced, so that the productivity is improved. When the volatile component is removed before the molding process, the time required for drying and molding after receiving resin pellets is shortened, and a cycle from the step of receiving of resins to the step of molding is improved.

Problems solved by technology

Therefore, in summer when a temperature increases, there is a problem of occurring blocking of resin pellets again if the storage temperature is not controlled by an air conditioner or the like, and re-grinding process before use is required.
Furthermore, the present inventors have reviewed this method and as a result, the stick temperature was also generally equal to or less than 25 degrees centigrade in the same manner as in Patent Document 1, so that storage of resin pellets was limited.
Also, in the technology described in Patent Document 3, there was a problem such that a resin powder layer to be applied on a copolymerized polyester resin was easily detached.

Method used

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  • Resin pellet and method for producing the same
  • Resin pellet and method for producing the same
  • Resin pellet and method for producing the same

Examples

Experimental program
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Effect test

example 1

[0101]An aqueous dispersion (solid content concentration: 40 mass %) was prepared by dispersing microparticles composed of an ethylene-vinyl acetate copolymer having the content of vinyl acetate of 19 mass %, MFR of 150 g / 10 min, a Vicat softening point of 42 degrees centigrade, a shore hardness of 86 and the degree of crystallinity of 26. 500 g of the aqueous dispersion was heated to 45 degrees centigrade, and 100 g of pellets (pellet temperature: 15 degrees centigrade) was added thereto, and the aqueous dispersion and pellets were contacted under stirring for 30 seconds. The pellets were composed of an ethylene-vinyl acetate copolymer having the content of vinyl acetate of 46 mass %, MFR of 100 g / 10 min, a Vicat softening point of equal to or less than 25 degrees centigrade (ΔT≧17), a shore hardness of 16 (ΔHS: 70) and the degree of crystallinity of 0% (Δa: 26%) as a resin base material. Subsequently, the obtained resin pellets were cooled in cold water of 10 degrees centigrade an...

example 2

[0102]To 10 kg of pellets (pellet temperature: 20 degrees centigrade) was added 300 g (corresponding to 0.03 times relative to total weight of base material) of an aqueous dispersion (solid content concentration: 40 mass %), and the resulting mixture was heated until the pellet temperature became 30, 40 and 50 degrees centigrade respectively. The pellets were composed of an ethylene-vinyl acetate copolymer having the content of vinyl acetate of 46 mass %, MFR of 100 g / 10 min, a Vicat softening point of equal to or less than 25 degrees centigrade, a shore hardness of 16 and the degree of crystallinity of 0% as a resin base material, while the aqueous dispersion was prepared by dispersing microparticles composed of an ethylene-vinyl acetate copolymer having the content of vinyl acetate of 19 mass %, MFR of 150 g / 10 min, a Vicat softening point of 42 degrees centigrade (ΔT≧17), a shore hardness of 86 (ΔHS: 70) and the degree of crystallinity of 26% (Δa: 26%). The mixture was heated by ...

example 3

[0103]To 100 g of pellets (pellet temperature: 15 degrees centigrade) was added 3 g (corresponding to 0.03 times relative to total weight of base material) of an aqueous dispersion (solid content concentration: 40 mass %), and the resulting mixture was allowed to stand in an oven at a temperature of 45 degrees centigrade and a humidity of 30% for 15, 30, 45, 50 and 60 minutes respectively. The pellets were composed of an ethylene-vinyl acetate copolymer having the content of vinyl acetate of 46 mass %, MFR of 100 g / 10 min, a Vicat softening point of equal to or less than 25 degrees centigrade, a shore hardness of 22 and the degree of crystallinity of 0% as a resin base material, while the aqueous dispersion was prepared by dispersing microparticles composed of an ethylene-vinyl acetate copolymer having the content of vinyl acetate of 19 mass %, MFR of 150 g / 10 min, a Vicat softening point of 42 degrees centigrade (ΔT≧17), a shore hardness of 86 (ΔHS: 64) and the degree of crystallin...

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Abstract

A resin pellet of the present invention includes a resin base material and a plurality of microparticles embedded in the resin base material. The resin pellet is covered with the plurality of microparticles on the surface of the resin base material. According to the present invention, it is possible to prevent detachment of the microparticles to be applied on the resin base material and to effectively suppress blocking of resin pellets.

Description

TECHNICAL FIELD[0001]The present invention relates to a resin pellet and a method for producing the resin pellet.BACKGROUND ART[0002]In the past, blocking of resin pellets has been a problem, so that various measures have been taken.[0003]Patent Document 1 discloses that anti-adhesive powder is attached on the surface of EVA particles in a post-treatment step of the manufacturing process of resin pellets having ethylene-vinyl acetate copolymer particles as a base material by feeding EVA particles which have been cut in water into a transportation tube, and contacting with an anti-adhesive powder slurry in the transportation tube. It is described to be found that blocking is not occurred by such a manner even though a large amount of resin pellets are accumulated in a large hopper.[0004]Patent Document 2 discloses that EVA microparticles is attached on the surface of EVA particles in a post-treatment step of the manufacturing process of resin pellets having EVA particles as a base ma...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B5/16B05D7/02B05D7/24B05D1/00
CPCC08J3/124Y10T428/2991C08J2323/08B29B9/12B29B2009/165B29B9/00C08J3/12C08L23/08C08L31/04
Inventor CHIBA, KAZUYUKISASAI, IZUMI
Owner MITSUI LTD
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