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Molding material using ethylene-vinyl ester copolymer saponified product
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A vinyl ester and saponified technology, applied in the field of molding materials, can solve the problem of difficult to cut resins at intervals, and achieve the effect of excellent feedability and overload reduction.
Active Publication Date: 2019-01-18
MITSUBISHI CHEM CORP
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Problems solved by technology
[0005] It is difficult to cut a large amount of resin at precise intervals in a short time with the wire cutting method
Method used
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[0136]
[0137] The molding material of the present invention comprises a mixture of EVOH resin particles (A1) and EVOH resin particles (A2), both of which are produced by the method described above.
[0138] Between the particles A1 and A2, the EVOH resins constituting the particles have the same or different properties, including ethylene unit content, degree of saponification, and types and contents of additives.
[0139] The weight mixing ratio of granules A1 to granules A2, ie A1 / A2, is generally in the range of 99 / 1 to 20 / 80, preferably 97 / 3 to 55 / 45, particularly preferably 95 / 5 to 80 / 20.
[0140] An excessively small mixing ratio tends to deteriorate the feedability of the molding material at the time of melt extrusion molding. An excessively large mixing ratio does not impart the effect of cylindrical pellets to the molding material, resulting in reduced feedability during melt extrusion molding.
[0141] Granules A1 and granules A2 are mixed mechanically or manual...
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[0168] Hereinafter, the present invention is described below based on Examples, but the present invention is not limited by the Examples as long as the gist of the present invention is not exceeded.
[0169] Incidentally, the unit "part" in the examples is based on weight unless otherwise specified.
[0170] [Manufacture of molding materials No.1 to No.11]
[0171] (1) EVOH resin particles having a substantially circular or elliptical cross section (particle A1)
[0172] Cylindrical EVOH resin particles with a water content of 0.1% (where the EVOH resin has an ethylene unit content of 29 mol%, a saponification degree of 99.6 mol%, and an MFR of 4.0 g / 10 min (210° C., a load of 2,160 g)) was used as Raw material for pellet A1. Cylindrical EVOH resin pellets were supplied to a twin-screw extruder and melt-kneaded, and pelletized by cutting in water under the conditions described above. The EVOH resin melt was extruded into cooling water and cut using a cutter (16 blades) fitt...
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Abstract
Provided is a melt-molding material which is produced using an ethylene-(vinyl ester)-based copolymer saponified product (EVOH resin) and has excellent feedability during extrusion melt-molding. A molding material comprising a group of EVOH resin particles, the molding material being characterized in that the group of particles comprises: first EVOH resin particles each having a substantially circular cross-section or an elliptical cross-section and second EVOH resin particles having a cylindrical shape , wherein the mixing weight ratio (A1 / A2) of the first EVOH resin particles (A1) to the second EVOH resin particles (A2) is 99 / 1 to 20 / 80.
Description
technical field [0001] The present invention relates to a molding material composed of ethylene-vinyl ester copolymer saponified product (hereinafter referred to as "EVOH resin") pellets, in particular to a molding material composed of EVOH resin pellets and formed during melt extrusion molding A molding material exhibiting excellent feedability. Background technique [0002] EVOH resins have high crystallinity due to strong hydrogen bonds between hydroxyl groups in their polymer chains, thereby exhibiting strong intermolecular forces. In EVOH resin, not only the crystalline part but also the amorphous part can exhibit strong intermolecular force. This imparts excellent gas barrier properties to the EVOH resin film. [0003] Because of excellent gas barrier properties, EVOH resins are used in packaging films or sheets for foods, medicines, industrial pharmaceuticals, and agricultural chemicals, or containers such as bottles. The EVOH resins used to form these articles are...
Claims
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