Polyester film and manufacturing method therefor, and polyester mold product using same and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-10774189-B2
Application number	US-201515302303-A
Country	US
Kind code	B2
Filing date	Apr 10, 2015
Priority date	Apr 11, 2014
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

Provided are a polyester film that is usable for protecting a surface of a metal plate of a construction material, a decorative material, an interior material, an electronic product, etc., and a manufacturing method therefor, and a polyester mold product using the same and a manufacturing method therefor, wherein the polyester film has low orientation and low modulus to have excellent moldability.

First claim

The invention claimed is:

1. A polyester film consisting of a copolymerized polyester alone or a mixture of a copolymerized polyester and a homo polyethylene terephthalate resin,
wherein 20% tensile modulus F20 is 8.0 to 14.5 kg/mm 2 , and 100% tensile modulus F100 is 11.0 to 21.5 kg/mm 2 in a machine direction and a transverse direction,
a modulus variation A according to a tensile rate according to Equation 1 below in 20% to 100% of tensile section is 3 to 10 kg/mm 2 :
A =( F 100− F 20)/0.8,  [Equation 1]

a heat shrinkage of the film in the machine direction and the transverse direction after heat treatment at 150° C. for 30 minutes is 2% or less, and
moldability is 80% or more, and
wherein the polyester film includes 1 to 4.8 mol % of neopentyl glycol unit, based on a total moles of diol components in the polyester film, and
wherein the copolymerized polyester consists of a terephthalic acid unit, an ethylene glycol unit and the neopentyl glycol unit.

2. The polyester film of claim 1 , wherein shrinkage stress in the machine direction after 100 seconds at 140° C. from an initial load of 6.21 N/mm 2 is −5.5 to −3.0 N/mm 2 , and shrinkage stress in the machine direction after 100 seconds at 140° C. from an initial load of 0.65 N/mm 2 is −0.5 to 1.0 N/mm 2 .

3. The polyester film of claim 1 , wherein the polyester film has a melting point of 240 to 253° C.

4. The polyester film of claim 1 , wherein the polyester film has a plane orientation coefficient of 0.120 to 0.155.

5. The polyester film of claim 1 , wherein the polyester film has density of 1.384 to 1.397 g/cm 3 .

6. The polyester film of claim 1 , wherein the polyester film has a total thickness of 10 to 100 μm.

7. The polyester film of claim 1 , wherein the polyester film has a surface concave-convex formed on at least any one surface by hair-line processing.

Assignees

• Kolon Inc

Inventors

• Kim Si Min
• Kim Dong Jin
• Kim Yun Jo

Classifications

• B32B27/08

  of synthetic resin · CPC title

• B32B37/10

  characterised by the pressing technique, e.g. using action of vacuum or fluid pressure · CPC title

• B29K2705/00

  Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts · CPC title

• B29C66/742

  to metals or their alloys · CPC title

• B32B2307/50

  having particular mechanical properties · CPC title