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Flexible resin pellet and process for producing same

A technology of soft resin and pellets, applied in the field of soft resin pellets and their manufacture

Inactive Publication Date: 2003-08-13
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the state of powder sprinkled on the surface of the pellets causes some problems in handling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0264] Density of ethylene / 1-butene copolymer (EBR) (ASTM D 1505) = 0.865 g / cm 3 , MFR (ASTM D 1238, 190 °C, load 2.16 kg) = 4 g / 10 min, ethylene content = 82 mole %, and tensile modulus (YM) = 9.5 MPa, extruded at 200 °C using a single screw The ethylene / 1-butene copolymer was kneaded and granulated by a machine. One batch of 100 parts by weight of pellet copolymer, 0.1 part by weight of silicone oil (trade name: SH200, manufactured by Dow Corning Toray Silicone Co., Ltd; kinematic viscosity (20° C.)=500 cSt, surface tension (20° C.)=20 Da in / cm) was mixed mechanically using a Henschel mixer.

[0265] The obtained soft resin pellets coated with silicone oil were all mechanically mixed with 0.35 parts by weight of calcium stearate using a Henschel mixer, and the average particle diameter of the calcium stearate was 20 microns.

[0266] The granules obtained contained silicone oil in an adhering amount of 990 ppm by weight and calcium stearate in an adhering amount of 3350 pp...

Embodiment 2

[0275] Propylene / Ethylene Copolymer (PER) Density (ASTM D 1505) = 0.858 g / cm 3 , MFR (ASTMD 1238, 190 °C, load 2.16 kg) = 2 g / 10 min, propylene content = 60 mole %, and tensile modulus (YM) = 3.5 MPa, using a single screw extruder at 200 °C The ethylene / 1-butene copolymer was kneaded and pelletized. One batch of 100 parts by weight of pellet copolymer, 0.1 part by weight of silicone oil (trade name: SH200, manufactured by Dow Corning Toray Silicone Co., Ltd; kinematic viscosity (20° C.)=500 cSt, surface tension (20° C.)=20 Da in / cm) was mixed mechanically using a Henschel mixer.

[0276] The obtained soft resin pellets coated with silicone oil were all mechanically mixed with 0.35 parts by weight of calcium stearate using a Henschel mixer, and the average particle diameter of the calcium stearate was 20 microns.

[0277] The granules obtained contained silicone oil in an adhering amount of 980 ppm by weight and calcium stearate in an adhering amount of 3400 ppm by weight.

...

Embodiment 3

[0284] Use oil-extended ethylene / propylene / 5-ethylene-2-norbornene copolymer (oil-extended EPDM) (density (ASTMD 1505) = 0.87 g / cm 3 , Mooney viscosity [ML1+4 (100°C)]=74, intrinsic viscosity (in decalin at 135°C)=3dl / g, ethylene / propylene / 5-ethylidene-2-norbornene (molar ratio)=78 / 15.8 / 6.2 moles %, iodine value = 13, tensile modulus (YM) = 2 MPa, oil extension = 40 phr) and softener (trade name: W-380, produced by Idemitsu Petrochemical Co.). This copolymer was kneaded and pelletized using a single-screw extruder at 200°C. One batch of 100 parts by weight of pellet copolymer, 0.1 part by weight of silicone oil (trade name: SH200, manufactured by Dow Corning Toray Silicone Co., Ltd; kinematic viscosity (20° C.)=500 cSt, surface tension (20° C.)=20 Da in / cm) was mixed mechanically using a Henschel mixer.

[0285] The obtained soft resin pellets coated with silicone oil were all mechanically mixed with 0.35 parts by weight of calcium stearate using a Henschel mixer, and the av...

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Abstract

Flexible resin pellets which comprise pellets of a flexible resin having a tensile modulus of 1,600 MPa or lower selected among the following (i) to (v) and, deposited on the surface thereof, a liquid having a dynamic viscosity at 25 deg.C of 0.5 to 100,000 cSt and a surface tension at 25 deg.C of 10 to 50 dyne / cm (e.g., dimethylpolysiloxane) and fine particles having an average particle diameter of 50 micro or smaller (e.g. calcium searate): a specific ethylene / alpha-olefin copolymer, a specific propylene / alpha-olefin copolymer, an unsaturated olefin copolymer obtained from ethylene, a C3-20 alpha-olefin, and an (un)conjugated polyene monomer, an ethylene / vinyl acetate copolymer having a vinyl acetate unit content of 5 to 40 wt.%, and a cycloolefin resin. The flexible resin pellets are excellent in nontackiness, appearance, and handleability.

Description

technical field [0001] The present invention relates to soft resin pellets having excellent anti-adhesive properties and excellent appearance, and a method for producing the same. Background technique [0002] Soft resins, such as olefin copolymer rubbers, such as ethylene / propylene copolymer rubber and ethylene / propylene / diene copolymer rubber, are usually sold in the form of blocks, such as bales. [0003] These block olefin copolymer rubbers suffer from the disadvantages of being difficult to remove from storage, difficult to supply or transport to forming and processing equipment, and difficult to weigh. [0004] Therefore, olefin copolymer rubber, if supplied in the form of pellets, does not have the disadvantages mentioned above and has many advantages: high-yield extruders can be used to prepare compounds from pelletized olefin copolymer rubber and compounding components, Instead of inefficient mixers (such as Banbury mixers), this mixer is often used to mix olefin c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L23/08C08L23/14C08L23/16C08L45/00
CPCC08L23/0815C08L45/00C08J3/124C08L23/16C08L23/14C08L23/0853C08L2666/04
Inventor 守屋悟细见泰弘
Owner MITSUI CHEM INC