Plastic film and a method for preparing the same

Patent metadata

Field	Value
Publication number	US-2016289407-A1
Application number	US-201415037846-A
Country	US
Kind code	A1
Filing date	Nov 24, 2014
Priority date	Nov 25, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

The present invention relates to a plastic film and a method for preparing the same. More specifically, the present invention relates to a plastic film of high hardness and a method for preparing the same. According to the plastic film of the present invention and the preparation method thereof, it is possible to prepare a plastic film of high hardness which is less prone to curling easil

First claim

1 . A plastic film, including:
a supporting substrate; a first coating layer which is formed on one side of the supporting substrate; and a second coating layer which is formed on another side of the supporting substrate, wherein a first and a second coating layers include a crosslinking copolymer of a 3- to 6-functional acrylate compound and a thiol-containing compound, and inorganic particles independently equally or differently, and the plastic film shows a pencil hardness of 7H or more at the load of 1 kg.

2 . The plastic film according to claim 1 , wherein the first coating layer and the second coating layer include 40 to 90 parts by weight of the crosslinking copolymer and 10 to 60 parts by weight of the inorganic particles independently equally or differently.

3 . The plastic film according to claim 1 , wherein the weight ratio of the 3- to 6-functional acrylate compound and the thiol-containing compound which form the crosslinking copolymer is 99:1 to 60:40.

4 . The plastic film according to claim 1 , wherein the 3- to 6-functional acrylate compound includes at least one selected from the group consisting of trimethylolpropane triacrylate (TMPTA), trimethylolpropaneethoxy triacrylate (TMPEOTA), glycerin-propoxylated triacrylate (GPTA), pentaerythritol triacrylate (PETA), and dipentaerythritol hexaacrylate (DPHA).

5 . The plastic film according to claim 1 , wherein the thiol-containing compound includes at least one selected from the group consisting of pentaerythritol tetrakis thioglycolate, pentaerythritol tetrakis(2-mercaptoacetate), pentaerythritol tris(3-mercaptoacetate), trimethylolpropane tris(3-mercaptopropionate), trimethylolpropane tetrakis(3-mercaptopropionate), trimethylolpropane tris(3-mercaptobutylrate), mercaptopropyl isobutyl silsesquioxane, and mercaptopropyl isooctyl silsesquioxane.

6 . The plastic film according to claim 1 , wherein the thicknesses of the first coating layer and the second coating layer is 50 to 150 μM independently equally or differently.

7 . The plastic film according to claim 1 , wherein, when the plastic film is positioned on a flat plane after exposing the same to a temperature of 50° C. or more and a humidity of 80% or more for 70 hrs or more, the maximum distance of each edge or side of the plastic film apart from the plane is 2.0 mm or less.

8 . A method for preparing a plastic film, including the steps of:
coating a first coating composition including a first binder, first inorganic particles, and a first photoinitiator on one side of a supporting substrate; carrying out a first photo-curing by exposing the side on which the first coating composition is coated to UV light having a first wavelength until the first binder is partially crosslinked; coating a second coating composition including a second binder, second inorganic particles, and a second photoinitiator on the other side of the supporting substrate; and carrying out a second photo-curing by exposing the other side on which the second coating composition is coated to UV light having the first wavelength and a second wavelength that is longer than the first wavelength, wherein the first binder and the second binder are equal to or different from each other and include a 3- to 6-functional acrylate compound and a thiol-containing compound independently.

9 . The method according to claim 8 , wherein the first photo-curing step is carried out until 30 to 80 mole % of the first binder is crosslinked.

10 . The method according to claim 8 , wherein the UV light of the second wavelength photo-cures the first binder in the second photo-curing step.

11 . The method according to claim 8 , wherein the UV light of the first wavelength photo-cures the second binder in the second photo-curing step.

12 . The method according to claim 8 , wherein the first wavelength is 280 to less than 320 nm.

13 . The method according to claim 8 , wherein the second wavelength is 320 to 400 nm.

14 . The method according to claim 8 , wherein the thiol-containing compound includes at least one selected from the group consisting of pentaerythritol tetrakis thioglycolate, pentaerythritol tetrakis(2-mercaptoacetate), pentaerythritol tris(3-mercaptoacetate), trimethylolpropane tris(3-mercaptopropionate), trimethylolpropane tetrakis(3-mercaptopropionate), trimethylolpropane tris(3-mercaptobutylrate), mercaptopropyl isobutyl silsesquioxane, and mercaptopropyl isooctyl silsesquioxane.

15 . The method according to claim 8 , wherein the 3- to 6-functional acrylate compound includes at least one selected from the group consisting of trimethylolpropane triacrylate (TMPTA), trimethylolpropaneethoxy triacrylate (TMPEOTA), glycerin-propoxylated triacrylate (GPTA), pentaerythritol triacrylate (PETA), pentaerythritol tetraacrylate, and dipentaerythritol hexaacrylate (DPHA).

16 . The method according to claim 8 , wherein the first inorganic particles and the second inorganic particles are equal to or different from each other and the particle diameter thereof is 100 nm or less.

17 . The method according to claim 8 , wherein the first inorganic particles and the second inorganic particles are equal to or different from each other and include at least one selected from the group consisting of silica nano particles, aluminum oxide particles, titanium oxide particles, and zinc oxide particles.

18 . The method according to claim 8 , wherein the first coating composition and the second coating composition are equal to or different from each other and coated to have the thickness of 50 to 150 μm when they are completely cured.

19 . The method according to claim 8 , exhibiting a pencil hardness of 7H or more at the load of 1 kg.

Assignees

• Lg Chemical Ltd

Inventors

• Park Jin Young
• Jung Soon Hwa
• Lee Han Na
• Chang Yeong Rae
• Kang Joon Koo
• Jeong Hyeok
• Her Eun Kyu

Classifications

• C08K3/36

  Silica · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title