CN102338891A - Protective film of optical film - Google Patents

Abstract

The invention relates to a protective film for optical film in backlight module of flat liquid crystal display, which mainly comprises a non-adhesive layer and an adhesive layer, wherein the non-adhesive layer and the adhesive layer are made of more than two kinds of polyolefin materials or polyolefin elastomers or vinyl acetate materials, the materials are extruded by an extruder after being mixed, and the protective film is cooled and tempered after being formed, so that the dimensional stability of the protective film can be ensured in different temperature environments.

Description

Protective film for optical film

technical field

The invention relates to a protective film, especially the protective film structure used in the optical film widely used in the backlight module of the flat liquid crystal display.

Background technique

According to the existing optical film, electronic parts transportation or processing, the parts are usually packaged in sheets, and in order to prevent the parts from being scratched or polluted during transportation, the protective film on the surface is placed on the optical film It is widely used in the field of electronic parts and electronic parts. In the manufacturing process, the optical film must be used with a protective film that is clean enough to reach the optical grade. The surface of the optical film is provided with many optical microstructures. These microstructures can effectively increase the luminance of the liquid crystal display. During the manufacturing process of the optical film, a protective film with a clean level of optical grade must be used to effectively protect the microstructure of the optical film and the good quality of the product. The protective film is mainly used in the production, processing and assembly process of the optical film to protect the optical film to avoid damage to the front and back of the fragile optical film. The protective film used in the current optical prism film is mostly made of polypropylene biaxially stretched film (BOPP Film), and a layer of acrylic (PMMA) glue or thermoplastic (Thermal) glue is coated on the stretched film. Plastic) glue, because the adhesive layer of the coating is low molecular weight, so the range of adhesive strength is wide, and it is widely used. However, when this kind of protective film is manufactured, the adhesive layer must be applied to the non-adhesive layer with an organic solvent. This process is not an environmentally friendly process, it will produce peculiar smell, and must be baked a second time to remove the organic solvent, thus causing an increase in cost. In addition, it is easy to cause residual glue and stains on the microstructure surface of the optical film, and it is easy to tear Higher static electricity will also be generated during filming, so that when the optical film is applied to a backlight module, the quality of the image quality will be poor, resulting in an adverse effect of increasing the defect rate.

In view of the above-mentioned deficiencies of the known protective film, how to develop a low-cost protective film that can reliably protect the microstructure and non-structural surface of the optical film is an urgent problem for the relevant industry to overcome. where the subject is.

Contents of the invention

The main technical means of the present invention is a protective film for an optical film, the protective film mainly has a non-adhesive layer and an adhesive layer, the non-adhesive layer and the adhesive layer are made of polyolefin materials or thermoplastic rubber materials, the The material is extruded by the extruder after batching. The protective film is cooled and tempered immediately after forming, so that the protective film can ensure the stability of the size in different temperature environments. In addition, the non-adhesive layer and The adhesive layer does not require additional coating and processing of the adhesive layer and the release material, thereby eliminating the need for solvents and secondary processing, thereby achieving an environmentally friendly and energy-saving manufacturing process and reducing manufacturing costs.

The next technical means of the present invention is to provide a protective film for an optical film, the protective film mainly has a non-adhesive layer and an adhesive layer, the non-adhesive layer and the adhesive layer are made of polyolefin material or thermoplastic rubber The material is composed of materials, which are extruded by an extruder after batching. The overall thickness of the protective film ranges from 20 μm to 100 μm, and the thickness of the adhesive layer ranges from 3 μm to 97 μm. The adhesive layer of the protective film is in contact with the optical film. When the surface of the structure is placed, local deformation will occur, and the depth of the deformation of the adhesive layer will be smaller than the thickness of the adhesive layer, and the width of the deformation will be greater than the width of the microstructure, so as to achieve the effect of improving the attachment yield and easy to tear off.

Another technical means of the present invention is to provide a protective film for an optical film, the protective film mainly has a non-adhesive layer and an adhesive layer, and the non-adhesive layer and the adhesive layer are made of two or more polyolefins Material or vinyl acetate material, the material is extruded by the extruder after batching, the protective film is cooled and tempered immediately after forming, so that the protective film can ensure the stability of the size in different temperature environments, Wherein, the overall thickness of the protective film is 40 μm to 100 μm, the thickness of the non-adhesive layer is 4 μm to 90 μm, which accounts for 10% to 90% of the overall thickness, and is made of polyolefin raw materials. The thickness ranges from 4 μm to 90 μmm, which accounts for 10% to 90% of the overall thickness. It is made of vinyl acetate, and the adhesion of the adhesive layer to the non-structural surface of the optical film is 1 to 10g/25mm (JIS- Z-0237), thereby avoiding the phenomenon of residual glue, and achieving an environmentally friendly and energy-saving process and reducing manufacturing costs.

Another technical means of the present invention is to provide a protective film for an optical film. The protective film mainly has a non-adhesive layer and an adhesive layer. The non-adhesive layer and the adhesive layer are made of polyolefin material or thermoplastic rubber. The material is composed of materials, and the material is extruded by an extruder after batching, wherein the non-adhesive layer further includes an intermediate layer and a surface layer, and an antistatic agent and (or) colored polyethylene can be added to the intermediate layer, thereby It can prevent the generation of static electricity when the protective film is torn off, and use the color as the identification of the protective film.

Description of drawings

The schematic diagram of Fig. 1 protective film of the present invention;

Fig. 2 is a schematic diagram of the application of the protective film of the present invention to the microstructure surface of the optical film;

Fig. 3 is the schematic diagram of another embodiment of protective film of the present invention;

Fig. 4 is a schematic diagram of applying the protective film of the present invention to the non-microstructured surface of the optical die.

【Description of figure number】

1 Protective film 11 Non-adhesive layer 111 Surface layer

                                                                   

2 optical film 21 microstructure surface 22 non-microstructure surface

3 protective film 31 non-adhesive layer 311 surface layer

                                                               

Detailed ways

First, please refer to FIG. 1 , the protective film 1 of the present invention at least includes a non-adhesive layer 11 and an adhesive layer 12 . The non-adhesive layer 11 includes a surface layer 111 and an intermediate layer 112, wherein the material of the non-adhesive layer 11 is composed of two or more polyolefin polymer materials, and the molecular weight of this polyolefin polymer material is between Between 1,000 and 100,000, and the ratio ranges from 1:1 to 1:100. The material of the adhesive layer 12 is composed of a polyolefin polymer material and a thermoplastic rubber material. The molecular weight of the polyolefin polymer material is between 10,000-100,000, and the molecular weight of the thermoplastic material is between 50,000-200,000. Among them, the thermoplastic material contains cyclobenzene polyolefin polymer material, and the content of the cyclobenzene polyolefin polymer material accounts for 5%-45% in the thermoplastic rubber material. After the above-mentioned materials pass through the batching system, they will be extruded by the extruder and merged into one body at the die head of the extruder. After the protective film 1 is formed, the non-adhesive layer 11 and the adhesive layer 12 are formed and extruded at the same time, and no further processing is required. Coating and processing the adhesive layer and the release material layer, and the protective film 1 is extruded through the die head, and then undergoes cooling and tempering processes, thereby ensuring the dimensional stability of the protective film 1 at different temperatures, When winding into a roll material, it goes through different stages of tension control to ensure good unwinding characteristics of the roll material. The overall thickness of the formed protective film 1 ranges from 20 μm to 100 μm, and the thickness of the adhesive layer 12 ranges from 3 μm to 97 μm. , the thickness of the non-adhesive layer 11 ranges from 97 μm to 3 μm, and the thickness ratio of the surface layer 111 and the middle layer 112 of the non-adhesive layer 11 is between 1:1 and 1:100, wherein the surface layer 111 The roughness is greater than the surface roughness of the adhesive layer 12, and is between 0.1 μm and 2.0 μm (JIS-K-7125), while the optical haze value (Haze, %) of the protective film 1 (JIS-K-7105) is between Between 10% and 80%.

When the protective film of the present invention is implemented, as shown in FIG. 2 , the adhesive layer 12 of the protective film 1 is pasted on the surface of the microstructure 21 of the optical film 2 . The adhesion force on the surface is 2-10N/25mm (JIS-Z-0237); and the adhesion tension to the surface microstructure 21 of the optical film 2 is 2-20g/25mm. In addition, when the protective film 1 is attached to the optical film 2 When the surface of the microstructure 21, when the surface of the adhesive layer 12 of the protective film 1 is in contact with the surface of the microstructure 21, there will be local deformation characteristics, and there will be local deformation according to the shape of the surface geometry of the microstructure 21 characteristics, the depth of its deformation is smaller than the thickness of the adhesive layer 12, the width of its deformation is larger than the width of the microstructure 21 of the optical film 2, and when the protective film 1 is torn off, a short-lived local deformation features.

Please also refer to FIG. 3, which is another embodiment of the present invention. The protective film 3 at least includes a non-adhesive layer 31 and an adhesive layer 32, which are mainly made of high molecular polymer or thermoplastic rubber material. After the material passes through the batching system, it will be extruded by the extruder and merged into one body at the die head of the extruder. When the protective film 3 is formed, the non-adhesive layer 31 and the adhesive layer 32 are formed and extruded at the same time, and no additional coating is required. The adhesive layer and the release material layer are processed, and the protective film 3 is extruded through the die head, and then undergoes cooling and tempering processes, thereby ensuring the dimensional stability of the protective film 3 at different temperatures. When coiled material is rolled, it is controlled through different stages of tension to ensure good unwinding characteristics of the coiled material, wherein the non-adhesive layer 31 includes a surface layer 311 and an intermediate layer 312, and the material of the non-adhesive layer 31 It is composed of two or more polyolefin polymer materials, such polyolefin polymer materials can be PE series, such as LDPE (low density polyethylene), MDPE (medium density polyethylene), HDPE (high density polyethylene) Polyethylene), LLDPE (linear low-density polyethylene), or PP such as Random PP (random copolymerization), Block PP (block copolymerization) or the above raw material mixture, its molecular weight is between 1000 and 100000 Between, its ratio ranges from 1:1 to 1:100, and its density (g/cm ³ ) is between 0.85 to 0.97 g/cm ³ , the middle layer 312 is the rigid main frame of the protective film 1, And the ratio of the middle layer 312 to the overall thickness of the protective film 1 is 10% to 90%. The middle layer 312 is made of polyolefin raw materials, and the polyolefin can be PE series, such as LDPE (low density polyethylene). ), MDPE (medium density polyethylene), HDPE (high density polyethylene), LLDPE (linear low density polyethylene), or can be PP such as Random PP (random copolymerization), Block PP (block copolymerization) or the The above-mentioned raw material mixture has a molecular weight between 1,000 and 100,000, wherein the intermediate layer 312 is made of PE that can be added with an antistatic agent and/or colored, and the melt flow rate (MFR) of the PE is 1 at 200°C. ~20 (g/10min). The material of the adhesive layer 32 is polyethylene acetate, the molecular weight of the polyethylene acetate is between 10,000-120,000, the molecular weight of the thermoplastic material is between 5,000-200,000, and its density (g/cm ³ ) is 0.90 ~0.96g/cm ³ , wherein, the content ratio of the acetic acid content in the polyethylene acetate is between 5% and 30%, and the adhesive layer 32 can be PO (polyolefin material) during implementation, Its molecular weight is between 1,000 and 100,000, and its density (g/cm ³ ) is between 0.80 and 1g/cm ³ , and polyolefin polymer materials can be added to adjust the level of adhesion according to requirements. The proportion of polymer material added to the adhesive layer 32 can be 0% to 99%. In addition, PE or tackifier (rosin ester resin, hydrocarbon resin or vinyl resin) can be added to the adhesive layer 32. The mixing ratio of PE or tackifier can be adjusted to 1:1~1:100 according to the requirement. When the protective film 3 is implemented, the adhesive layer 32, the intermediate layer 312 and the surface layer 311 are combined by a co-extrusion process, and the optical haze value (Haze, %) of the protective film 3 (JIS-K-7105) Between 5% and 60%.

When the protective film 3 of the present invention is applied, as shown in FIG. 4 , it includes a non-adhesive layer 31 and an adhesive layer 32. The adhesive layer 32 accounts for 10% to 90% of the overall thickness, thereby making the protective film The adhesive layer 32 of 3 can reach the adhesive force required by the non-structural surface 22 of the optical film 2, and is attached to the non-structural surface 22 of the optical film 2 at a room temperature of 25°C. Under a peeling speed of 300mm/min, the Adhesion between 1 ~ 5g/25mm.

The effect of the present invention lies in that the non-adhesive layer 11 and the adhesive layer 12 of the protective film 1 are made of polyolefin material or thermoplastic rubber material. In this way, the protective film 1 can ensure the dimensional stability in different temperature environments. In addition, the non-adhesive layer 11 and the adhesive layer 12 do not need to be additionally coated with an adhesive layer and a release material, and can save Solvents and secondary processing are used to achieve environmental protection and energy-saving manufacturing processes and reduce manufacturing costs; in addition, the overall back thickness of the protective film 1 ranges from 20 μm to 100 μm, and the thickness of the adhesive layer 12 ranges from 3 μm to 97 μm. , when the adhesive layer 12 of the protective film 1 is in contact with the surface of the microstructure 21 of the optical film 2, local deformation will occur, and the depth of deformation of the adhesive layer 12 will be smaller than the thickness of the adhesive layer 12, and the width of the deformation will be greater than that of the microstructure 21 Width, in order to achieve the effect of improving the attachment yield and easy to tear off. In addition, a non-adhesive layer 31 and an adhesive layer 32 are composed of two or more polyolefin materials or thermoplastic rubber materials, the materials are compounded and then extruded by an extruder, and the protective film 3 is cooled immediately after forming. and tempering process, so that the protective film 3 can ensure the dimensional stability in different temperature environments, and the non-adhesive layer 31 accounts for 10% to 90% of the overall thickness and is made of polyolefin materials The adhesive layer 32 accounts for 10% to 90% of the overall thickness and is made of vinyl acetate, so that the adhesion of the adhesive layer 32 to the non-structural surface 22 of the optical film 2 is maintained at 1 to 10g/25mm In between, this can avoid the phenomenon of residual glue, and can achieve the effect of environmental protection and energy saving process and reduce manufacturing cost. In addition, the non-adhesive layer 31 further includes a middle layer 312 and a surface layer 311, and the middle layer 312 can be Adding an antistatic agent and (or) colored polyethylene can reduce the generation of static electricity when the protective film 3 is torn off, and use the color as the identification of the protective film 3 .

Claims (24)

1. the diaphragm of a blooming piece is characterized in that, includes at least:

One non-adhesion layer is formed with two or more polyalkenes macromolecular materials, and the molecular weight of this polyalkenes macromolecular material is between 1000～100000, and proportional range is by between 1: 1～1: 100;

One adhesion layer; But, polyalkenes macromolecular material and thermoplastic rubber material formed by being consisted of the polyalkenes material; The molecular weight of this polyalkenes macromolecular material is between 1000～100000; But be somebody's turn to do thermoplastic rubber material molecule amount between 50000～200000, but and should contain ring benzene polyalkenes macromolecular material by the thermoplastic rubber material.

2. the diaphragm of blooming piece as claimed in claim 1 is characterized in that, but this ring benzene polyalkenes macromolecular material accounts for 5%～45% of thermoplastic rubber material.

3. the diaphragm of blooming piece as claimed in claim 1 is characterized in that, this non-adhesion layer includes a superficial layer and a middle layer.

4. the diaphragm of blooming piece as claimed in claim 1 is characterized in that, this adhesion layer is 2～10N/25mm to PC surface mount power.

5. the diaphragm of blooming piece as claimed in claim 1 is characterized in that, the integral thickness scope of this diaphragm is 20 μ m～100 μ m.

6. the diaphragm of blooming piece as claimed in claim 1 is characterized in that, this adhesion layer thickness range is 3 μ m～97 μ m.

7. the diaphragm of blooming piece as claimed in claim 1 is characterized in that, the thickness range of this non-adhesion layer is 97 μ m～3 μ m.

8. the diaphragm of blooming piece as claimed in claim 3 is characterized in that, the thickness proportion in this superficial layer and middle layer is between 1: 1～1: 100.

9. the diaphragm of blooming piece as claimed in claim 3 is characterized in that, the surfaceness of this superficial layer is greater than the surfaceness of adhesion layer, and between 0.1 μ m～2.0 μ m.

10. the diaphragm of blooming piece as claimed in claim 1 is characterized in that, (Haze is %) between 10%～80% for the optics haze value of this diaphragm.

11. the diaphragm of a blooming piece is characterized in that, the surface of this blooming piece is provided with numerous microstructures, and this diaphragm has a non-adhesion layer and an adhesion layer, and this non-adhesion layer is formed with two or more polyalkenes macromolecular materials; And but adhesion layer is consisted of the polyalkenes material by polyalkenes macromolecular material and thermoplastic rubber material and is formed; Wherein, When this diaphragm was attached at the micro-structure surface of blooming piece, the adhesion layer of this diaphragm can produce local deformation along with the geometric shape of micro-structure surface.

12. the diaphragm of blooming piece as claimed in claim 11 is characterized in that, this adhesion layer is 2～20g/25mm to the pulling force that sticks together of blooming piece microstructure face.

13. the diaphragm of blooming piece as claimed in claim 11 is characterized in that, the deforming depth of this adhesion layer is less than the thickness of adhesion layer.

14. the diaphragm of blooming piece as claimed in claim 11 is characterized in that, the distortion width of this adhesion layer is greater than the width of microstructure.

15. the diaphragm that blooming piece is used is characterized in that, this diaphragm includes at least:

One non-adhesion layer is processed with two or more polyalkenes macromolecular materials,

One adhesion layer, vinyl polymer material that this adhesion layer is two or more or thermoplastic rubber material constitute,

Wherein, The integral thickness of this diaphragm is 30 μ m～100 μ m; The thickness range of this non-adhesion layer is 90 μ m～4 μ m, and it accounts for the integral thickness ratio is 10%～90%, and the thickness range of adhesion layer is 4 μ m～90 μ mm; It accounts for the integral thickness ratio is 10%～90%, and this adhesion layer is 1～10g/25mm for the adhesion of the non-structural plane of blooming piece.

16. the diaphragm that blooming piece as claimed in claim 15 is used is characterized in that, the optics haze value (Haze) of this diaphragm is between 5%～60%.

17. the diaphragm that blooming piece as claimed in claim 15 is used is characterized in that, this non-adhesion layer includes a superficial layer and a middle layer.

18. the diaphragm that blooming piece as claimed in claim 17 is used is characterized in that, this middle layer is to add coloured PE.

19. the diaphragm that blooming piece as claimed in claim 18 is used is characterized in that, the fusion flow velocity of this PE under 190 ℃/2.16Kg is 1～20 (g/10min).

20. the diaphragm that blooming piece as claimed in claim 17 is used is characterized in that, antistatic agent can be added in this middle layer.

21. the diaphragm that blooming piece as claimed in claim 15 is used is characterized in that, the molecular weight of the polyalkenes macromolecular material of non-adhesion layer is between 1000～100000, and its proportional range is between 1: 1～1: 100, and density is 0.85～0.97g/cm ³Between.

22. the diaphragm that blooming piece as claimed in claim 15 is used is characterized in that, the vinyl polymer material of this adhesion layer is the acetic acid tygon, and its molecular weight is between 10000～120000, and density is at 0.90～0.96g/cm ³Between.

23. the diaphragm that blooming piece as claimed in claim 22 is used is characterized in that, the acetic acid content ratio in this acetic acid tygon is between 5～30%.

24. the diaphragm that blooming piece as claimed in claim 15 is used is characterized in that, but the vinyl polymer material of this adhesion layer is a polyolefin, its molecular weight is between 1000～100000, and density is at 0.80～1g/cm ³Between.

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