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US-12624247-B2 - Film

US12624247B2US 12624247 B2US12624247 B2US 12624247B2US-12624247-B2

Abstract

The present application relates to a film. The present application can provide a film having excellent optical characteristics such as transparency or haze, mechanical properties such as hardness, and flexibility, wherein the shape of the surface is controlled to be suitable for various uses, and the controlled surface shape has excellent durability.

Inventors

  • Hyun Taek OH
  • Kwang Seung Park
  • Chang Hoon SIN

Assignees

  • LG CHEM, LTD.

Dates

Publication Date
20260512
Application Date
20201218
Priority Date
20191220

Claims (19)

  1. 1 . A film comprising a base film and a cured material layer of an energy beam-curable composition formed on one side or both sides of the base film, wherein the energy beam-curable composition comprises a silicone resin component represented by the following average unit formula 1, (R 1 3 SiO 1/2 ) a (R 2 2 SiO 2/2 ) b (R 3 SiO 3/2 ) c (SiO 4/2 ) d (RO 1/2 ) e [Average Unit Formula 1] wherein, R 1 to R 3 are each independently a hydrogen atom, an alkyl group, an aryl group or an energy beam-curable group, and when R 1 to R 3 exist plurally, they are each the same or different from each other, and at least one of R 1 to R 3 is an energy beam-curable group, and when a+b+c+d has been converted to 1, a, b, c and d satisfy 0≤a≤1, 0<b≤1, 0<c≤1 and 0≤d≤1, respectively, and e is a number in which e/(a+b+c+d) falls within a range of 0 to 0.4, and wherein the cured material layer has an uneven surface having a negative skewness according to ISO 25178 standard on at least one side thereof, wherein the uneven surface satisfies one or more of the following equations 1 to 3: 0.3≥Δ H= 100×|( H A −H I )/ N| [Equation 1] 0.3≥Δ G= 100×|( G A −G I )/ N| [Equation 2] 0.3≥Δ R= 100×|( R A −R I )/ N| [Equation 3] wherein, ΔH, ΔG and ΔR are a change rate of haze, a change rate of 60-degree gloss and a change rate of arithmetic mean roughness (Ra) of the uneven surface, respectively; in the Equation 1, H I is an initial haze of the uneven surface, H A is a haze of the uneven surface after performing a steel wool test, N is the number of times that the steel wool test has been performed, and |(H A −H I )/N| is an absolute value of a numerical value obtained by putting the H A , H I and N into (H A −H I )/N; in the Equation 2, G I is an initial 60-degree gloss of the uneven surface, G A is a 60-degree gloss of the uneven surface after performing the steel wool test, N is the number of times that the steel wool test has been performed, and |(G A −G I )/N| is an absolute value of a numerical value obtained by putting the G A , G I and N into (G A −G I )/N; and in the Equation 3, R I is an initial arithmetic mean roughness (Ra) of the uneven surface, R A is an arithmetic mean roughness (Ra) of the uneven surface after performing the steel wool test, N is the number of times that the steel wool test has been performed, and |(R A −R I )/N| is an absolute value of a numerical value obtained by putting the R A , R I and N into (R A −R I )/N, and in the Equations 1 to 3, N is 1,500 times to 3,000 times.
  2. 2 . The film according to claim 1 , wherein the uneven surface satisfies two or more of the equations 1 to 3.
  3. 3 . The film according to claim 1 , wherein the uneven surface satisfies all of the equations 1 to 3.
  4. 4 . The film according to claim 1 , wherein the negative skewness of the uneven surface according to ISO 25178 standard is −2 or more and less than 0.
  5. 5 . The film according to claim 1 , wherein the energy beam-curable composition further comprises a reactive diluent.
  6. 6 . The film according to claim 5 , wherein the reactive diluent is an acrylate compound.
  7. 7 . The film according to claim 5 , wherein the energy beam-curable composition comprises 1 to 200 parts by weight of a reactive diluent relative to 100 parts by weight of the silicone resin component.
  8. 8 . The film according to claim 1 , wherein the silicone resin component has a weight average molecular weight in a range of 10,000 to 50,000.
  9. 9 . The film according to claim 1 , wherein the silicone resin component has a molecular weight distribution of 1.8 or more.
  10. 10 . The film according to claim 1 , wherein the uneven surface has a pencil hardness of 5H or more.
  11. 11 . The film according to claim 1 , wherein the uneven surface has 500 g steel wool resistance of 1,500 times or more.
  12. 12 . The film according to claim 1 , wherein the uneven surface has a haze in a range of 3% to 50%.
  13. 13 . The film according to claim 1 , wherein the uneven surface has an arithmetic mean roughness Ra in a range of 0.01 μm to 2 μm.
  14. 14 . The film according to claim 1 , wherein the uneven surface has a 60-degree gloss in a range of 10% to 90%.
  15. 15 . The film according to claim 1 , wherein the film has a ratio (CTEF2/CTEF1) of a coefficient of thermal expansion (CTEF1) in a first direction and a coefficient of thermal expansion (CTEF2) in a second direction perpendicular to the first direction is 1.5 or more.
  16. 16 . The film according to claim 1 , wherein the film has a ratio (YMF1/YMF2) of an elastic modulus (YMF1) in a first direction to an elastic modulus (YMF2) in a second direction perpendicular to the first direction is 1.1 or more.
  17. 17 . The film according to claim 1 , wherein the film has a ratio (MSF1/MSF2) of a maximum stress (MSF1) in a first direction to a maximum stress (MSF2) in a second direction perpendicular to the first direction is 1.5 or more.
  18. 18 . The film according to claim 1 , wherein the film has a ratio (EF1/EF2) of an elongation rate (EF1) in a first direction to an elongation rate (EF2) in a second direction perpendicular to the first direction is 1.5 or more.
  19. 19 . An optical laminate comprising an optical functional layer and the film of claim 1 formed on one side of the optical functional layer.

Description

This application is a 35 U.S.C. 371 National Phase Entry Application from PCT/KR2020/018654 filed on Dec. 18, 2020, which claims the benefits of the filing dates of Korean Patent Application No. 10-2019-0171331, filed on Dec. 20, 2019, in the Korean Intellectual Property Office, and of Korean Patent Application No. 10-2020-0178179, filed on Dec. 18, 2020, in the Korean Intellectual Property Office, all of the disclosures of which are incorporated by reference herein in their entirety. TECHNICAL FIELD The present application relates to a film. BACKGROUND OF THE INVENTION A transparent resin film has excellent optical characteristics and has properties that are difficult to break compared to glass, so that it can be considered as a glass substitute. As a method of producing a transparent resin film, a method also called a so-called cell casting method, such as a method of injecting a curable composition into cells and then curing it or a method of flow casting a curable composition on a steel belt and curing it, is known. The cell casting method is known in Patent Document 1 or the like, but this method cannot continuously produce the film, and the efficiency is not good. The method of flow casting a curable composition on a steel belt and curing it is known in Patent Document 2 or the like, but in this method, it is difficult to produce a film having uniform physical properties. BRIEF SUMMARY OF THE INVENTION The present application aims to provide a film. It is one aspect of the present application to provide a film having excellent optical characteristics such as transparency or haze, mechanical properties such as hardness, and flexibility, wherein the shape of the surface is controlled to be suitable for various uses, and the controlled surface shape has excellent durability. DETAILED DESCRIPTION OF THE INVENTION Among physical properties referred to in this specification, the physical properties that the measurement temperature and/or the measurement pressure affect the results are the results measured at room temperature and/or normal pressure, unless otherwise specified. The term room temperature is a natural temperature without warming or cooling, which means, for example, any one temperature in a range of 10° C. to 30° C., or a temperature of 23° C. or about 25° C. or so. Also, in this specification, the unit of temperature is Celsius (° C.), unless otherwise specified. The term normal pressure is a natural pressure without pressurizing or depressurizing, which means, usually, about 1 atm or so of atmospheric pressure. In this specification, in the case of physical properties in which the measurement humidity affects the results, the relevant physical properties are the physical properties measured at natural humidity which is not particularly controlled at the room temperature and/or normal pressure state. In the present application, the term alkyl group, alkylene group or alkoxy group may mean a linear or branched alkyl group, alkylene group or alkoxy group, having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, or may mean a cyclic alkyl group, alkylene group or alkoxy group, having 3 to 20 carbon atoms, 3 to 16 carbon atoms, 3 to 12 carbon atoms, 3 to 8 carbon atoms or 3 to 6 carbon atoms, unless otherwise specified. In the present application, the term alkenyl group may mean a linear or branched alkenyl group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms or 2 to 4 carbon atoms, or may mean a cyclic alkenyl group having 3 to 20 carbon atoms, 3 to 16 carbon atoms, 3 to 12 carbon atoms, 3 to 8 carbon atoms or 1 to 6 carbon atoms, unless otherwise specified. In the present application, the term aryl group or arylene group may mean an aryl group or arylene group, having 6 to 24 carbon atoms, 6 to 18 carbon atoms or 6 to 12 carbon atoms, or may mean a phenyl group or a phenylene group, unless otherwise specified. In the present application, the term epoxy group may mean a monovalent residue derived from cyclic ether having three ring constituent atoms or a compound comprising the cyclic ether, unless otherwise specified. The epoxy group may be exemplified by a glycidyl group, an epoxyalkyl group, a glycidoxyalkyl group or an alicyclic epoxy group, and the like. Here, the alicyclic epoxy group may mean a monovalent residue derived from a compound containing an aliphatic hydrocarbon ring structure and including a structure in which two carbon atoms forming the aliphatic hydrocarbon ring also form an epoxy group. As the alicyclic epoxy group, an alicyclic epoxy group having 6 to 12 carbons may be exemplified, and for example, a 3,4-epoxycyclohexylethyl group and the like may be exemplified. The alkyl group, alkylene group, alkoxy group, alkenyl group, aryl group, arylene group or epoxy group may also be optionally substituted with one or more substituents. The present application relates to a film