INTERLAYER FILM FOR LAMINATED GLASS, AND LAMINATED GLASS

Abstract

The present invention aims to provide an interlayer film for laminated glass which has a laminated structure including a plastic layer with a high Young's modulus and a resin layer, which is excellent in impact resistance and penetration resistance, which has high adhesiveness between the plastic layer and the resin layer, and which prevents blocking of the resin layer, and a laminated glass including the interlayer film for laminated glass. The present invention relates to an interlayer film for laminated glass, having a multilayer structure including: a plastic layer with a Young's modulus of 1 GPa or more; and a first resin layer on a first surface of the plastic layer, the first resin layer having a glossiness of 10 to 40 on the surface on the side to be in contact with the plastic layer.

Claims

1. An interlayer film for laminated glass, having a multilayer structure including: a plastic layer with a Young's modulus of 1 GPa or more; and a first resin layer on a first surface of the plastic layer, the first resin layer having a glossiness of 10 to 40 on the surface on the side to be in contact with the plastic layer.

2. The interlayer film for laminated glass according to claim 1, wherein the first resin layer has a ten-point average roughness Rz determined in conformity with JIS B0601-1982 of 5 to 55 m on the surface on the side to be in contact with the plastic layer.

3. The interlayer film for laminated glass according to claim 1, wherein the first resin layer has a pitch of roughness measured in conformity with JIS B0601-1982 of 80 m or more on the surface on the side to be in contact with the plastic layer.

4. A laminated glass comprising a pair of glass plates and the interlayer film for laminated glass according to claim 1 positioned between the pair of glass plates.

5. The interlayer film for laminated glass according to claim 2, wherein the first resin layer has a pitch of roughness measured in conformity with JIS B0601-1982 of 80 m or more on the surface on the side to be in contact with the plastic layer.

6. A laminated glass comprising a pair of glass plates and the interlayer film for laminated glass according to claim 2 positioned between the pair of glass plates.

7. A laminated glass comprising a pair of glass plates and the interlayer film for laminated glass according to claim 3 positioned between the pair of glass plates.

8. A laminated glass comprising a pair of glass plates and the interlayer film for laminated glass according to claim 5 positioned between the pair of glass plates.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0053] FIG. 1 is a schematic view for showing a surface of a first resin layer on the side to be in contact with a plastic layer.

DESCRIPTION OF EMBODIMENTS

[0054] The present invention is specifically described in the following with reference to, but not limited to, examples.

Example 1

(1) Plastic Layer

[0055] A polyethylene terephthalate film (U34 LUMIRROR produced by TORAY Industries, Inc., Young's modulus: 4.5 GPa, thickness: 100 m) was used as a plastic layer.

(2) Preparation of First Resin Layer

[0056] To 100 parts by mass of polyvinyl butyral (hydroxy group content: 30 mol %, degree of acetylation: 1 mol %, degree of butyralization: 69 mol %, average degree of polymerization: 1700) were added 40 parts by mass of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer, 0.5 parts by mass of 2-(2-hydroxy-3-t-butyl-5-methylphenyl)-5-chlorobenzotriazole (Tinuvin326 produced by Basf SE) as an ultraviolet shielding agent, and 0.5 parts by mass of 2,6-di-t-butyl-p-cresol (BHT) as an antioxidant, and sufficiently kneaded with a mixing roll to give a resin composition.

[0057] The resulting resin composition was extruded from an extruder to give a single-layer first resin layer having a thickness of 380 m. For the extrusion, a lip die having lips with an interval of 1.0 mm was used, the temperature of the resin composition at the inlet of the die and the temperature of the lip die were adjusted to 200 C. and 210 C., respectively, and the line speed was set to 10 m/min. The obtained first resin layer was wound to give a roll.

(3) Production of Interlayer Film for Laminated Glass

[0058] The obtained first resin layer and plastic layer were thermally press-bonded by a roll-to-roll method using a thermal press-bonding laminator (MRK-650Y type produced by MCK Co., Ltd.) under the conditions of a heating temperature of 90 C., a pressure for the press-bonding of 1 kN, and a tension upon delivery of 100 N, thereby producing an interlayer film for laminated glass having a double layer structure.

Examples 2 to 7, Comparative Examples 1 to 4

[0059] The interlayer film for laminated glass and a roll were produced in the same manner as in Example 1, except that the interval of lips, the temperature of the resin composition at the inlet of the die, the temperature of the lip die, and the line speed in the production of the first resin layer were changed.

(Evaluation)

[0060] The first resin layers and interlayer films for laminated glass obtained in the examples and comparative examples were evaluated by the following methods.

[0061] Table 1 shows the results.

(1) Measurement Performed on the Surface of the First Resin Layer

[0062] The glossiness of the surface of each obtained first resin layer on the side to be in contact with the plastic layer was measured using a precision gloss meter (GM-26PRO produced by Murakami Color Research Laboratory or the like) in conformity with the measuring method 2 disclosed in JIS Z 8741:1997. In the measurement, the minimum glossiness obtained by setting the first resin layer on a sample table and measuring the glossiness while rotating the first resin layer on the sample table to the irradiation direction of a light source was determined as the glossiness of the surface of the first resin layer on the side to be in contact with the plastic layer.

[0063] Further, the ten-point average roughness Rz and the pitch of roughness of the surface of the first resin layer on the side to be in contact with the plastic layer were measured by a method in conformity with JIS B0601-1982.

(2) Evaluation of Blocking

[0064] The roll (500 m) of each obtained first resin layer was set on a rewinder, and the force required for rewinding the first resin layer was measured using a tension detector (LX-050TD produced by Mitsubishi Electric Corporation). Commonly, when the maximum value of the force required for rewinding the first resin layer is 350 N/m or less, it is determined that blocking does not occur. The case where the force required for rewinding the first resin layer from the roll was 200 N/m or less was rated Excellent (), the case where the force was more than 200 N/m but not more than 350 N/m was rated Good (), and the case where the force was more than 350 N/m was rated Poor (x).

(3) Adhesive Force between Plastic Layer and Resin Layer

[0065] The adhesive force between the plastic layer and the first resin layer was measured using a TENSILON universal testing machine (RTM-500 produced by Orientec Co., LTD.) at 23 C. at a rate of 500 mm/min in conformity with JIS K6854-2.

[0066] Commonly, when the adhesive force between the plastic layer and the resin layer is 3 N/5 cm or higher, it is considered that a problem of peeling or the like does not occur. The case where the adhesive force between the plastic layer and the resin layer was 8 N/5 cm or higher was rated Excellent (). The case where the adhesive force was lower than 8 N/5 cm but not lower than 5 N/5 cm was rated Very Good (). The case where the adhesive force was lower than 5 N/5 cm but not lower than 3 N/5 cm was rated Good (). The case where the adhesive force was lower than 3 N/5 cm was rated Poor (x).

TABLE-US-00001 TABLE 1 Surface of the first resin layer on the side to be in contact with the plastic layer Ten point average Pitch of Glossi- roughness roughness Evaluation ness Rz (m) (m) Blocking Adhesiveness Example 1 10 23 100 Example 2 22 5 85 Example 3 12 54 150 Example 4 30 19 650 Example 5 40 15 430 Example 6 14 41 130 Example 7 20 35 250 Comparative 5 20 92 x Example 1 Comparative 45 5 310 x Example 2 Comparative 5 55 810 x Example 3 Comparative 52 48 730 x Example 4

INDUSTRIAL APPLICABILITY

[0067] The present invention can provide an interlayer film for laminated glass which has a laminated structure including a plastic layer with a high Young's modulus and a resin layer, which is excellent in impact resistance and penetration resistance, which has high adhesiveness between the plastic layer and the resin layer, and which prevents blocking of the resin layer. The present invention also can provide a laminated glass including the interlayer film for laminated glass.

REFERENCE SIGNS LIST

[0068] 1: Interlayer film for laminated glass [0069] 2: Plastic layer [0070] 3: First resin layer [0071] 31: Surface of the first resin layer 3 on the side to be in contact with the plastic layer 2