Multilayered aliphatic polyester film
A polyester film, aliphatic technology, applied in the field of multi-layer aliphatic polyester film, can solve the problems of unsuitable packaging, high heat shrinkage, surface ripples, etc., and achieve the effect of excellent mechanical properties
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Embodiment 1
[0035]A polylactic acid resin (Nature Works LLC) having a melting point of 154° C., and a master batch resin prepared by dispersing silica having a particle diameter of 2 μm in the same polylactic acid resin were mixed so that the resulting film The silica content of was changed to 0.07% by weight, which was designated as the first resin (A).
[0036] The thus obtained first and second resins, amorphous polylactic acid (Nature Works LLC) having no distinct melting point and containing 12% by weight of D-lactic acid, were melt-extruded through two extruders by controlling the gear pump speed The feed ratio of the first and second resins was maintained at 5:1 and they were laminated to form a laminated two-layer (A / B) in the feedblock. The laminate thus obtained was passed through a T-die and cooled in a cooling cylinder to obtain a bilayer coextruded sheet.
[0037] The coextruded sheet thus obtained was stretched at 75°C at a stretch ratio of 3.0 in the machine direction and ...
Embodiment 2
[0039] Repeat the process of Example 1, the difference is to use 90% by weight of amorphous polylactic acid resin containing 12% by weight of D-lactic acid and 10% by weight of aliphatic polyester resin (Ire chemical Ltd., Enpol resin G4460 (PBAS) ) mixture (with a glass transition temperature of -48°C) as the second resin layer to obtain a bilayer (A / B) coextruded sheet.
[0040] The thus-obtained bilayer coextruded sheet was stretched at 70°C at a stretch ratio of 3.0 in the longitudinal direction and at a stretch ratio of 3.8 in the transverse direction at 75°C, thermally cured at 130°C, and 3% relaxation was performed to obtain a biaxially stretched polyester film having a thickness of 30 μm.
Embodiment 3
[0042] The process of Example 1 was repeated, except that a polylactic acid resin with a melting point of 170°C and a number average molecular weight of 110,000 and containing 1.4% by weight of D-lactic acid was used as the first resin, and a polylactic acid resin with no obvious melting point and containing 12% by weight of D-lactic acid was used. A mixture of an amorphous polylactic acid resin of lactic acid, a masterbatch resin having a particle diameter of 2 μm of silica in the same resin (silica content: 0.07% by weight) as a second resin layer, to obtain three layers ( B / A / B) Coextruded sheet.
[0043] The thus-obtained three-layer coextruded sheet was stretched at 78°C at a stretch ratio of 3.0 in the machine direction and at 85°C at a stretch ratio of 3.8 in the transverse direction, thermally cured at 163°C, and 3% relaxation was performed to obtain a biaxially stretched polyester film having a thickness of 30 μm.
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Abstract
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