Polyester film for forming
A polyester film and film technology, used in other household appliances and other directions, can solve the problems of leftover moldings, such as finishing, not meeting high requirements, etc., and achieve the effects of excellent thickness uniformity, low environmental burden, and excellent formability.
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Embodiment 1
[0192] Intrinsic viscosity of constituent components comprising 100 mol% of terephthalic acid units as an aromatic dicarboxylic acid component, 40 mol% of ethylene glycol units and 60 mol% of neopentyl glycol units as a diol component Chip (A) of copolyester of 0.69 dl / g and polyterephthalate having an intrinsic viscosity of 0.69 dl / g and containing 0.04% by mass of amorphous silica with an average particle diameter (SEM method) of 1.5 μm The ethylene formate slices (B) were dried separately. Then, slice (A) and slice (B) were mixed in a mass ratio of 25:75. Next, these sliced mixtures are melted and extruded from the gap of the T-die through an extruder at 270°C, quenched and solidified on a chilled roll with a surface temperature of 40°C, and adhered by electrostatic application. On chilled rolls, an amorphous undrawn sheet is obtained.
[0193] The obtained unstretched sheet was placed between a heating roll and a cooling roll, and stretched 3.3 times in the longitudina...
Embodiment 2
[0204] Intrinsic viscosity of constituent components are 100 mol% of terephthalic acid units in the aromatic dicarboxylic acid component, 70 mol% of ethylene glycol units in the diol component, and 30 mol% of neopentyl glycol units Chip (C) of copolyester of 0.77 dl / g and polyterephthalene having an intrinsic viscosity of 0.63 dl / g and containing 0.04% by mass of amorphous silica with an average particle diameter (SEM method) of 1.5 μm Chips of ethylene formate (D), and chips of polypropylene terephthalate having an intrinsic viscosity of 0.75 dl / g and containing 0.04% by mass of amorphous silica with an average particle diameter (SEM method) of 1.5 μm (E) Drying is carried out separately. Then, slice (C), slice (D) and slice (E) were mixed in a mass ratio of 50:10:40. Next, these sliced mixtures are melted and extruded from the gap of the T-die through an extruder at 270°C, quenched and solidified on a chilled roll with a surface temperature of 40°C, and adhered by electro...
Embodiment 3
[0208] The constituent components are 100 mol% of terephthalic acid units as the aromatic dicarboxylic acid component, 70 mol% of ethylene glycol units as the diol component, and 30 mol% of 1,4-cyclohexanedimethanol Unit chips (F) of copolyester having an intrinsic viscosity of 0.71 dl / g and chips (B) of polyethylene terephthalate were mixed at a mass ratio of 50:50 and dried. Next, these sliced mixtures are melted and extruded from the gap of the T-die through an extruder at 270°C, quenched and solidified on a chilled roll with a surface temperature of 40°C, and adhered by electrostatic application. On chilled rolls, an amorphous undrawn sheet is obtained.
[0209] The obtained unstretched sheet was placed between a heating roll and a cooling roll, and stretched 3.5 times in the longitudinal direction at 90°C. Next, the uniaxially stretched film was introduced into a tenter, preheated at 120°C for 10 seconds, and stretched 3.9 times at 105°C in the first half of the transv...
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Abstract
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