JP2016069168A - Roll body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll body in which, unintended fall of a winding core is less likely to occur.SOLUTION: A roll body 51 comprises a winding core 61 and an intermediate film 1 for glass laminate which is wound around an outer periphery of the winding core, in which a linear expansion coefficient of the winding core at 5-50°C is, 6×10/°C or less, and a contraction coefficient when the intermediate film for glass laminate is heated for 20 minutes at 140°C is 3% or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a roll body having an interlayer film for laminated glass used for obtaining laminated glass, and the interlayer film for laminated glass being wound in a roll shape.

  Laminated glass is excellent in safety because it has less scattering of glass fragments even if it is damaged by external impact. For this reason, the said laminated glass is widely used for a motor vehicle, a rail vehicle, an aircraft, a ship, a building, etc. The laminated glass is manufactured by sandwiching an interlayer film for laminated glass between a pair of glass plates.

  During the production of the intermediate film, the intermediate film may be wound into a roll for the purpose of temporary storage and transportation.

  A roll body in which the intermediate film is wound in a roll shape is disclosed in, for example, Patent Document 1 below.

WO1999 / 46213

  In a roll body in which the intermediate film is wound in a roll shape, the core may come off unintentionally. The roll body may be placed vertically so that the axis is in the vertical direction. In the vertically placed state, the winding core is particularly likely to come off. Further, when the interlayer film for laminated glass includes a relatively hard layer, the winding core is particularly likely to come off.

  An object of the present invention is to provide a roll body in which unintended winding cores are unlikely to come off.

According to a wide aspect of the present invention, a winding core and an interlayer film for laminated glass wound around the outer periphery of the winding core are provided, and the linear expansion coefficient of the winding core at 5 to 50 ° C. is 6 × 10 ^{−. 5} / ° C. or lower, and a roll body having a shrinkage ratio of 3% or lower when the interlayer film for laminated glass is heated at 140 ° C. for 20 minutes is provided.

  On the specific situation with the roll body which concerns on this invention, the said intermediate film for laminated glasses contains a polyester resin.

  In a specific aspect of the roll body according to the present invention, the interlayer film for laminated glass includes a first layer and a second layer arranged on one surface side of the first layer, The first layer includes a polyester resin, and the second layer includes a polyvinyl acetal resin.

  On the specific situation with the roll body which concerns on this invention, the said intermediate film for laminated glasses is equipped with the 3rd layer arrange | positioned on the 2nd surface side opposite to the said one surface of a said 1st layer. The third layer includes a polyvinyl acetal resin.

  On the specific situation with the roll body which concerns on this invention, the said core has an unevenness | corrugation in the surface where the said intermediate film for laminated glasses is wound.

  On the specific situation with the roll body which concerns on this invention, the outer diameter of a roll body is 0.4 m or more.

  On the specific situation with the roll body which concerns on this invention, the said intermediate film for laminated glasses is arrange | positioned between the 1st laminated glass member and the 2nd laminated glass member, after unwinding from the said core. Used to obtain laminated glass.

The roll body according to the present invention includes a winding core and an interlayer film for laminated glass wound around the outer periphery of the winding core, and the linear expansion coefficient of the winding core at 5 to 50 ° C. is 6 × 10 ^−5. Since the shrinkage rate is 3% or less when the interlayer film for laminated glass is heated at 140 ° C. for 20 minutes, it is difficult for unintended winding cores to come off.

FIG. 1 is a perspective view schematically showing a roll body according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a first example of an interlayer film for laminated glass. FIG. 3 is a cross-sectional view schematically showing a second example of the interlayer film for laminated glass. FIG. 4 is a cross-sectional view schematically showing an example of a laminated glass using the laminated glass interlayer film shown in FIG. FIG. 5 is a cross-sectional view schematically showing an example of a laminated glass using the laminated glass interlayer film shown in FIG.

  Details of the present invention will be described below.

  FIG. 1 is a perspective view schematically showing a roll body according to an embodiment of the present invention.

  A roll body 51 shown in FIG. 1 includes a winding core 61 and an interlayer film 1 for laminated glass. The interlayer film 1 for laminated glass is wound around the outer periphery of the winding core 61.

As described above, the roll body according to the present invention includes a winding core and an interlayer film for laminated glass (hereinafter sometimes referred to as an interlayer film) wound around the outer periphery of the winding core. In this invention, the linear expansion coefficient in 5-50 degreeC of the said winding core is 6 * 10 < ^-5 > / degrees C or less. In the present invention, the interlayer film for laminated glass has a shrinkage rate of 3% or less when heated at 140 ° C. for 20 minutes.

  In the present invention, since the above-described configuration is provided, unintended winding cores are unlikely to come off. Moreover, when the interlayer film for laminated glass contains a polyester resin, the interlayer film for laminated glass is difficult to shrink. For this reason, there is a tendency that the laminated core is not strongly wound around the laminated glass interlayer film, or that the tightening of the laminated glass interlayer film is difficult to proceed during storage. On the other hand, even if the interlayer film for laminated glass contains a polyester resin, it is possible to prevent unintended winding cores from coming off. When the intermediate film contains a polyester resin, the effect of the present invention is remarkably obtained.

  The winding core preferably has irregularities on the surface on which the interlayer film for laminated glass is wound. For example, the entire outer peripheral surface of the winding core may have irregularities, or may partially have irregularities.

  The outer diameter of the winding core is preferably 0.1 m or more, and preferably 0.3 m or less.

  The outer diameter of the roll body is preferably 0.4 m or more, and preferably 1.5 m or less. In the present invention, even if the roll body is large, the winding core can be prevented from coming off.

  The roll body can be obtained, for example, by melt-extruding an interlayer film for laminated glass, cooling, and winding the film on a winding core.

  The irregularities on the surface of the winding core are preferably formed by knurling.

  Next, the interlayer film for laminated glass will be described.

  FIG. 2 is a cross-sectional view schematically showing a first example of an interlayer film for laminated glass.

  The intermediate film 1 shown in FIG. 2 is a multilayer intermediate film having a structure of two or more layers. The intermediate film 1 is used to obtain a laminated glass. The intermediate film 1 is an intermediate film for laminated glass. The intermediate film 1 includes a first layer 2, a second layer 3, and a third layer 4. On the first surface 2a side of the first layer 2, the second layer 3 is disposed and laminated. On the second surface 2b side opposite to the first surface 2a of the first layer 2, the third layer 4 is disposed and laminated. The first layer 2 is an intermediate layer. The second layer 3 and the third layer 4 are, for example, protective layers, and are surface layers in the present embodiment. The first layer 2 is disposed between the second layer 3 and the third layer 4 and is sandwiched between them. Therefore, the intermediate film 1 has a multilayer structure in which the second layer 3, the first layer 2, and the third layer 4 are laminated in this order.

  Other layers may be arranged between the second layer 3 and the first layer 2 and between the first layer 2 and the third layer 4, respectively. It is preferable that the second layer 3 and the first layer 2 and the first layer 2 and the third layer 4 are directly laminated, respectively. Examples of other layers include layers containing polyethylene terephthalate and the like.

  FIG. 3 is a cross-sectional view schematically showing a second example of the interlayer film for laminated glass.

  The intermediate film 31 shown in FIG. 3 is a single-layer intermediate film having a single-layer structure. The intermediate film 31 is a first layer. The intermediate film 31 is used to obtain a laminated glass. The intermediate film 31 is an intermediate film for laminated glass.

  Hereinafter, details of the first layer (including a single-layer intermediate film), the second layer, and the third layer constituting the intermediate film, the first layer, the second layer, and Details of each component contained in the third layer will be described.

(Thermoplastic resin)
The intermediate film preferably contains a thermoplastic resin. The first layer preferably contains a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (1)). The second layer preferably contains a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (2)). The third layer preferably contains a thermoplastic resin (hereinafter sometimes referred to as a thermoplastic resin (3)). The thermoplastic resin is not particularly limited. As the thermoplastic resin, a conventionally known thermoplastic resin can be used. As for the said thermoplastic resin, only 1 type may be used and 2 or more types may be used together.

  Examples of the thermoplastic resin include polyester resin, polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, and polyvinyl alcohol resin. Thermoplastic resins other than these may be used.

  The thermoplastic resin (1) is preferably a polyester resin. The thermoplastic resin (1) may be a polyvinyl acetal resin. The thermoplastic resin (2) is preferably a polyvinyl acetal resin. The thermoplastic resin (3) is preferably a polyvinyl acetal resin.

  The polyvinyl acetal resin can be produced, for example, by acetalizing polyvinyl alcohol with an aldehyde. The polyvinyl alcohol can be produced, for example, by saponifying polyvinyl acetate. The saponification degree of the polyvinyl alcohol is generally in the range of 70 to 99.8 mol%.

  The average degree of polymerization of the polyvinyl alcohol is preferably 200 or more, more preferably 500 or more, preferably 3500 or less, more preferably 3000 or less, and further preferably 2500 or less. When the average degree of polymerization is not less than the above lower limit, the penetration resistance of the laminated glass is further enhanced. When the average degree of polymerization is not more than the above upper limit, the intermediate film can be easily molded.

  The average degree of polymerization of the polyvinyl alcohol is determined by a method based on JIS K6726 “Testing method for polyvinyl alcohol”.

  The number of carbon atoms of the acetal group contained in the polyvinyl acetal resin is not particularly limited. The aldehyde used when manufacturing the said polyvinyl acetal resin is not specifically limited. The carbon number of the acetal group in the polyvinyl acetal resin is preferably 3 or 4. When the carbon number of the acetal group in the polyvinyl acetal resin is 3 or more, the glass transition temperature of the intermediate film is sufficiently low.

  The aldehyde is not particularly limited. In general, an aldehyde having 1 to 10 carbon atoms is preferably used as the aldehyde. Examples of the aldehyde having 1 to 10 carbon atoms include propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, and n-nonylaldehyde. , N-decylaldehyde, formaldehyde, acetaldehyde, benzaldehyde and the like. Among these, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexylaldehyde or n-valeraldehyde is preferable, propionaldehyde, n-butyraldehyde or isobutyraldehyde is more preferable, and n-butyraldehyde is still more preferable. As for the said aldehyde, only 1 type may be used and 2 or more types may be used together.

  The hydroxyl group content (hydroxyl group amount) of the polyvinyl acetal resin is preferably 15 mol% or more, more preferably 18 mol% or more, preferably 40 mol% or less, more preferably 35 mol% or less. When the hydroxyl group content is at least the above lower limit, the adhesive strength of the interlayer film is further increased. Further, when the hydroxyl group content is not more than the above upper limit, the flexibility of the interlayer film is increased, and the handling of the interlayer film is facilitated.

  The hydroxyl group content of the polyvinyl acetal resin is a value indicating the mole fraction obtained by dividing the amount of ethylene groups to which the hydroxyl group is bonded by the total amount of ethylene groups in the main chain, as a percentage. The amount of ethylene group to which the hydroxyl group is bonded can be determined, for example, by measuring in accordance with JIS K6726 “Testing method for polyvinyl alcohol” or in accordance with ASTM D1396-92.

  The degree of acetylation (acetyl group amount) of the polyvinyl acetal resin is preferably 0.1 mol% or more, more preferably 0.3 mol% or more, still more preferably 0.5 mol% or more, preferably 30 mol% or less. More preferably, it is 25 mol% or less, More preferably, it is 20 mol% or less. When the acetylation degree is not less than the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer is increased. When the acetylation degree is not more than the above upper limit, the moisture resistance of the interlayer film and the laminated glass is increased.

  The degree of acetylation is obtained by subtracting the amount of ethylene groups to which acetal groups are bonded and the amount of ethylene groups to which hydroxyl groups are bonded from the total amount of ethylene groups of the main chain, It is a value indicating the mole fraction obtained by dividing by the percentage. The amount of ethylene group to which the acetal group is bonded can be measured, for example, according to JIS K6728 “Testing methods for polyvinyl butyral” or according to ASTM D1396-92.

  The degree of acetalization of the polyvinyl acetal resin (in the case of polyvinyl butyral resin, the degree of butyralization) is preferably 60 mol% or more, more preferably 63 mol% or more, preferably 85 mol% or less, more preferably 75 mol%. Hereinafter, it is 70 mol% or less more preferably. When the degree of acetalization is not less than the above lower limit, the compatibility between the polyvinyl acetal resin and the plasticizer increases. When the degree of acetalization is less than or equal to the above upper limit, the reaction time required for producing a polyvinyl acetal resin is shortened.

  The degree of acetalization is a value indicating the mole fraction obtained by dividing the amount of ethylene groups to which acetal groups are bonded by the total amount of ethylene groups in the main chain, as a percentage.

  The degree of acetalization was determined by measuring the degree of acetylation and the hydroxyl group content by a method based on JIS K6728 “Testing methods for polyvinyl butyral” or a method based on ASTM D1396-92. The rate can be calculated and then calculated by subtracting the degree of acetylation and the hydroxyl content from 100 mol%.

  The hydroxyl group content (hydroxyl group amount), acetalization degree (butyralization degree), and acetylation degree are preferably calculated from results measured by a method based on JIS K6728 “Testing methods for polyvinyl butyral”. When the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl group content (hydroxyl amount), the degree of acetalization (degree of butyralization) and the degree of acetylation are measured by a method according to JIS K6728 “Testing methods for polyvinyl butyral”. It is preferable to calculate from the obtained results.

(Plasticizer)
From the viewpoint of further increasing the adhesive strength of the interlayer film, the interlayer film preferably includes a plasticizer, the second layer preferably includes a plasticizer, and the third layer includes a plasticizer. Is preferred. The first layer may contain a plasticizer. When the thermoplastic resin in the second layer and the third layer is a polyvinyl acetal resin, it is particularly preferable that the second layer and the third layer each contain a plasticizer.

  The plasticizer is not particularly limited. A conventionally known plasticizer can be used as the plasticizer. As for the said plasticizer, only 1 type may be used and 2 or more types may be used together.

  Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and organic phosphate plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers. . Of these, organic ester plasticizers are preferred. The plasticizer is preferably a liquid plasticizer.

  The monobasic organic acid ester is not particularly limited. For example, a glycol ester obtained by reaction of glycol with a monobasic organic acid, and triethylene glycol or tripropylene glycol with a monobasic organic acid. Examples include esters. Examples of the glycol include triethylene glycol, tetraethylene glycol, and tripropylene glycol. Examples of the monobasic organic acid include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptylic acid, n-octylic acid, 2-ethylhexylic acid, n-nonylic acid, and decylic acid.

  The polybasic organic acid ester is not particularly limited, and examples thereof include an ester compound of a polybasic organic acid and an alcohol having a linear or branched structure having 4 to 8 carbon atoms. Examples of the polybasic organic acid include adipic acid, sebacic acid, and azelaic acid.

  The organic ester plasticizer is not particularly limited, and triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n- Octanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethyl butyrate, 1,3-propylene glycol di 2-ethyl butyrate, 1,4-butylene glycol di-2-ethyl butyrate, diethylene glycol di-2-ethyl butyrate, diethylene glycol di-2-ethyl hexanoate, dipropylene glycol Di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, adipine Examples include a mixture of heptyl acid and nonyl adipate, diisononyl adipate, diisodecyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified sebacic acid alkyd, and a mixture of phosphate ester and adipic acid ester. Organic ester plasticizers other than these may be used.

  The organophosphate plasticizer is not particularly limited, and examples thereof include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate, and the like.

  The plasticizer is preferably a diester plasticizer represented by the following formula (1).

  In the above formula (1), R1 and R2 each represent an organic group having 2 to 10 carbon atoms, R3 represents an ethylene group, an isopropylene group or an n-propylene group, and p represents an integer of 3 to 10. . R1 and R2 in the formula (1) are each preferably an organic group having 5 to 10 carbon atoms, and more preferably an organic group having 6 to 10 carbon atoms.

  The plasticizer preferably contains triethylene glycol di-2-ethylhexanoate (3GO) or triethylene glycol di-2-ethylbutyrate, and contains triethylene glycol di-2-ethylhexanoate. Is more preferable.

  The content of the plasticizer is not particularly limited. In the layer containing a plasticizer, the content of the plasticizer is preferably 25 parts by weight or more, more preferably 30 parts by weight or more, preferably 60 parts by weight or less, with respect to 100 parts by weight of the thermoplastic resin. Preferably it is 50 weight part or less. When the content of the plasticizer is not less than the above lower limit, the penetration resistance of the laminated glass is further enhanced. When the content of the plasticizer is not more than the above upper limit, the transparency of the interlayer film is further enhanced.

(Other ingredients)
The above-mentioned intermediate film may contain an ultraviolet shielding agent, an antioxidant, a light stabilizer, a flame retardant, an antistatic agent, a pigment, a dye, a moisture-resistant agent, an adhesive force adjusting agent, a fluorescent whitening agent, an infrared absorber, and the like as necessary. The additive may be included. As for these additives, only 1 type may be used and 2 or more types may be used together.

(Interlayer film for laminated glass)
The thickness of the intermediate film is not particularly limited. From the viewpoint of practical use and from the viewpoint of sufficiently increasing the heat shielding property, the thickness of the intermediate film is preferably 0.1 mm or more, more preferably 0.25 mm or more, preferably 3 mm or less, more preferably 1.5 mm or less. is there. When the thickness of the intermediate film is not less than the above lower limit, the penetration resistance of the laminated glass is increased.

  The method for producing the intermediate film is not particularly limited. A conventionally known method can be used as a method for producing the intermediate film. For example, the manufacturing method etc. which knead | mix a compounding component and shape | mold an intermediate film are mentioned. Since it is suitable for continuous production, an extrusion method is preferred.

  The kneading method is not particularly limited. Examples of this method include a method using an extruder, a plastograph, a kneader, a Banbury mixer, a calendar roll, or the like. Especially, since it is suitable for continuous production, a method using an extruder is preferable, and a method using a twin screw extruder is more preferable.

  The intermediate film may include an infrared reflective layer. When the intermediate film includes an infrared reflecting layer, the intermediate film is relatively hard. However, in the present invention, it is possible to suppress the core from coming off.

  The infrared reflection layer reflects infrared rays. The infrared reflection layer is not particularly limited as long as it has the ability to reflect infrared rays. Since the infrared reflecting layer is excellent in performance of reflecting infrared rays, the infrared reflecting layer preferably has a property that infrared transmittance is 40% or less at at least one wavelength in the range of 800 to 2000 nm. In at least one wavelength within the range of 800 to 2000 nm, the infrared transmittance is more preferably 30% or less, still more preferably 20% or less.

  Examples of the infrared reflective layer include a resin film with a metal foil, a multilayer laminated film in which a metal layer and a dielectric layer are formed on the resin layer, a film containing graphite, a multilayer resin film, and a liquid crystal film. These films have the ability to reflect infrared radiation.

  The infrared reflective layer is particularly preferably a resin film with a metal foil, a film containing graphite, a multilayer resin film, or a liquid crystal film. These films are quite excellent in infrared reflection performance. Therefore, the use of these films provides a laminated glass that has a higher heat-shielding property and can maintain a high visible light transmittance for a longer period of time. The infrared reflective layer may be a resin film with a metal foil, a multilayer resin film, or a liquid crystal film.

  The resin film with metal foil includes a resin film and a metal foil laminated on the outer surface of the resin film. Examples of the resin film material include polyethylene terephthalate resin, polyethylene naphthalate resin, polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic copolymer resin, polyurethane resin, polyvinyl alcohol resin, polyolefin resin, polychlorinated resin. A vinyl resin, a polyimide resin, etc. are mentioned. Examples of the material for the metal foil include aluminum, copper, silver, gold, palladium, and alloys containing these.

  The multilayer laminated film in which the metal layer and the dielectric layer are formed on the resin layer is a multilayer laminated film in which the metal layer and the dielectric layer are alternately laminated in any number of layers on the resin layer (resin film).

Examples of the material for the resin layer (resin film) in the multilayer laminated film include the same materials as those for the resin film in the resin film with metal foil. As the material of the resin layer (resin film) in the multilayer laminated film, polyethylene, polypropylene, polylactic acid, poly (4-methylpentene-1), polyvinylidene fluoride, cyclic polyolefin, polymethyl methacrylate, polyvinyl chloride, polyvinyl Examples include alcohol, polyamides such as nylon 6, 11, 12, 66, polystyrene, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, polyester, polyphenylene sulfide, and polyetherimide. Examples of the material for the metal layer in the multilayer laminated film include the same materials as those for the metal foil in the resin film with metal foil. A metal or mixed oxide coating layer can be applied to both or one side of the metal layer. Examples of the material for the coating layer include ZnO, Al ₂ O ₃ , Ga ₂ O ₃ , InO ₃ , MgO, Ti, NiCr, and Cu.

  Examples of the material of the dielectric layer in the multilayer laminated film include indium oxide.

  The multilayer resin film is a laminated film in which a plurality of resin films are laminated. Examples of the material for the multilayer resin film include the same materials as those for the resin layer (resin film) in the multilayer laminated film. The number of laminated resin films in the multilayer resin film is 2 or more, 3 or more, or 5 or more. 1000 or less may be sufficient as the number of lamination | stacking of the resin film in the said multilayer resin film, 100 or less may be sufficient, and 50 or less may be sufficient.

  The multilayer resin film may be a multilayer resin film in which two or more types of thermoplastic resin layers having different optical properties (refractive indexes) are alternately or randomly laminated in an arbitrary number of layers. Such a multilayer resin film is configured to obtain desired infrared reflection performance.

  As said liquid crystal film, the film which laminated | stacked the cholesteric liquid crystal layer which reflects the light of arbitrary wavelengths by arbitrary layers is mentioned. Such a liquid crystal film is configured to obtain desired infrared reflection performance.

(Laminated glass)
FIG. 4 is a cross-sectional view schematically showing an example of a laminated glass using the laminated glass interlayer film shown in FIG.

  A laminated glass 11 shown in FIG. 4 includes a first laminated glass member 21, a second laminated glass member 22, and the intermediate film 1. The intermediate film 1 is disposed between the first laminated glass member 21 and the second laminated glass member 22 and is sandwiched.

  A first laminated glass member 21 is laminated on the first surface 1 a of the intermediate film 1. A second laminated glass member 22 is laminated on a second surface 1 b opposite to the first surface 1 a of the intermediate film 1. A first laminated glass member 21 is laminated on the outer surface 3 a of the second layer 3 of the intermediate film 1. A second laminated glass member 22 is laminated on the outer surface 4 a of the third layer 4 of the intermediate film 1.

  FIG. 5 is a cross-sectional view schematically showing an example of a laminated glass using the laminated glass interlayer film shown in FIG.

  A laminated glass 41 shown in FIG. 5 includes a first laminated glass member 21, a second laminated glass member 22, and an intermediate film 31. The intermediate film 31 is disposed between the first laminated glass member 21 and the second laminated glass member 22 and is sandwiched. The first laminated glass member 21 is laminated on the first surface 31 a of the intermediate film 31. The second laminated glass member 22 is laminated on the second surface 31 b opposite to the first surface 31 a of the intermediate film 31.

  Thus, the laminated glass which concerns on this invention is the 1st laminated glass member, the 2nd laminated glass member, and the intermediate | middle arrange | positioned between the said 1st laminated glass member and a 2nd laminated glass member. And the intermediate film is the intermediate film for laminated glass of the present invention.

  Examples of the laminated glass member include a glass plate and a PET (polyethylene terephthalate) film. Laminated glass includes not only laminated glass in which an intermediate film is sandwiched between two glass plates, but also laminated glass in which an intermediate film is sandwiched between a glass plate and a PET film or the like. Laminated glass is a laminated body provided with a glass plate, and preferably at least one glass plate is used. Each of the first laminated glass member and the second laminated glass member is a glass plate or a PET film, and at least one of the first laminated glass member and the second laminated glass member is a glass plate. Preferably there is.

  Examples of the glass plate include inorganic glass and organic glass. Examples of the inorganic glass include float plate glass, heat ray absorbing plate glass, heat ray reflecting plate glass, polished plate glass, mold plate glass, and wire-containing plate glass. The organic glass is a synthetic resin glass substituted for inorganic glass. Examples of the organic glass include polycarbonate plates and poly (meth) acrylic resin plates. Examples of the poly (meth) acrylic resin plate include a polymethyl (meth) acrylate plate.

  The thickness of the laminated glass member is preferably 1 mm or more, preferably 5 mm or less, more preferably 3 mm or less. When the laminated glass member is a glass plate, the thickness of the glass plate is preferably 1 mm or more, preferably 5 mm or less, more preferably 3 mm or less. When the laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or more, and preferably 0.5 mm or less.

  The manufacturing method of the said laminated glass is not specifically limited. For example, the intermediate film is sandwiched between the first laminated glass member and the second laminated glass member, passed through a pressing roll, or put in a rubber bag and sucked under reduced pressure, so that the first The air remaining between the laminated glass member and the intermediate film and between the registered second laminated glass member and the intermediate film is degassed. Then, it pre-adheres at about 70-110 degreeC, and a laminated body is obtained. Next, the laminated body is put in an autoclave or pressed, and pressed at about 120 to 150 ° C. and a pressure of 1 to 1.5 MPa. In this way, a laminated glass can be obtained.

  The interlayer film and the laminated glass can be used for automobiles, railway vehicles, aircraft, ships, buildings, and the like. The said intermediate film and the said laminated glass can be used besides these uses. The interlayer film and the laminated glass are preferably a vehicle or architectural interlayer film and a laminated glass, and more preferably a vehicle interlayer film and a laminated glass. The intermediate film and the laminated glass can be used for an automobile windshield, side glass, rear glass, roof glass, or the like.

  The present invention will be described in more detail with reference to the following examples. The present invention is not limited to these examples.

  Regarding the polyvinyl butyral (PVB) resin used in the following Examples and Comparative Examples, the degree of butyralization (degree of acetalization), the degree of acetylation, and the content of hydroxyl groups are determined by a method in accordance with JIS K6728 “Testing methods for polyvinyl butyral”. It was measured. In addition, also when measured by ASTM D1396-92, the same numerical value as the method based on JIS K6728 "polyvinyl butyral test method" was shown.

Example 1
Polyvinyl alcohol having an average polymerization degree of 1700 is butyralized with n-butyraldehyde, so that the hydroxyl group content is 30.5 mol%, the acetylation degree is 0.9 mol%, and the butyralization degree is 68.6 mol. % Polyvinyl butyral resin was obtained. 100 parts by weight of the obtained polyvinyl butyral resin and 38 parts by weight of triethylene glycol di-2-ethylhexanoate as a plasticizer were mixed to obtain a resin composition. A resin film having a thickness of 380 μm was obtained from the obtained resin composition using an extruder. A polyethylene terephthalate film (manufactured by Toray Industries, Inc., model number “S10 Lumirror”) was laminated between the two resin films to obtain an interlayer film for laminated glass having a three-layer structure. The extrusion direction of the two resin films and the outer peripheral direction of the core coincide with each other under a winding tension of 200 N on a core (polypropylene containing talc) manufactured by Koka Polymer Co., Ltd. (outer diameter 15 cm, height 120 cm). Thus, the roll body was obtained by winding up 125m of interlayer films for laminated glass.

(Examples 2-3 and Comparative Example 1)
A roll similar to Example 1 except that the core of Example 1 was knurled into a core (polypropylene containing talc) (outer diameter 15 cm, height 120 cm) manufactured by Koka Polymer Co., Ltd. in Example 2. In Example 3, a roll body was prepared in the same manner as in Example 1 except that the core was made of Koka Polymer Co., Ltd. (material fiber reinforced plastic) (outer diameter 15 cm, height 120 cm). In Comparative Example 1, a roll body was produced in the same manner as in Example 1 except that the core was changed to a core made of Koga Polymer Co., Ltd. (material polypropylene) (outer diameter 15 cm, height 120 cm).

(Evaluation)
(1) Coefficient of linear expansion of the core The coefficient of linear expansion of the core was measured using a thermomechanical analyzer (“Thermo plus EVO2” manufactured by Rigaku Corporation) in accordance with JIS K7197 (1991). The linear expansion coefficient of the core of Examples 1 and 2 at 5 to 50 ° C. is 5 × 10 ⁻⁵ / ° C., and the linear expansion coefficient of the core of Example 3 is 4 × 10 ⁻⁵ / ° C. The linear expansion coefficient of the core of Comparative Example 1 was 10 × 10 ⁻⁵ / ° C.

(2) Shrinkage ratio of interlayer film for laminated glass The length in the extrusion direction of the resin film of the interlayer film for laminated glass having a three-layer structure is 15 cm, and the interlayer film for laminated glass is arranged in a direction perpendicular to the extrusion direction. Disconnected. The laminated film for laminated glass (length of 15 cm in the extruding direction of the resin film, 120 cm in length perpendicular to the extruding direction) is 15 cm long by 15 cm wide so as to include one end in the vertical direction. The sample was cut. The obtained sample was placed on a polytetrafluoroethylene sheet and left in an environment of 140 ° C. and 5% humidity for 20 minutes. The length of the sample in the extrusion direction after being left for 20 minutes was measured. The shrinkage rate was calculated by the following formula.

  Shrinkage rate (%) = ((15 cm− (length of sample in the extrusion direction after being left for 30 minutes)) / 15 cm) × 100

  The shrinkage ratio of the interlayer film for laminated glass was 1.5%.

(3) Ease of removal of the winding core The roll body was placed vertically so that the axis of the roll body was in the vertical direction. In this state, the ease of removal of the core was evaluated by applying a load of 100 kg to the vicinity of the upper end of the interlayer film for laminated glass wound around the outer periphery of the core. The ease of removal of the winding core was determined according to the following criteria.

[Criteria for easy removal of the core]
○: When a load was applied, the interlayer film for laminated glass did not move. △: The core did not come off due to the weight of the interlayer film for laminated glass. The core has come off due to the weight of the interlayer film for laminated glass

  Regarding the results of the ease of removal of the winding core, Example 1 was “Δ”, Example 2 was “O”, Example 3 was “O”, and Comparative Example 1 was “X”.

DESCRIPTION OF SYMBOLS 1 ... Intermediate film 1a ... 1st surface 1b ... 2nd surface 2 ... 1st layer 2a ... 1st surface 2b ... 2nd surface 3 ... 2nd layer 3a ... Outer surface 4 ... 3rd Layer 4a ... outer surface 11 ... laminated glass 21 ... first laminated glass member 22 ... second laminated glass member 31 ... intermediate film 31a ... first surface 31b ... second surface 41 ... laminated glass 51 ... roll body 61 ... winding core

Claims (7)

Winding core,
An interlayer film for laminated glass wound around the outer periphery of the core;
The linear expansion coefficient at 5 to 50 ° C. of the winding core is 6 × 10 ⁻⁵ / ° C. or less,
A roll body having a shrinkage rate of 3% or less when the interlayer film for laminated glass is heated at 140 ° C. for 20 minutes.   The roll body according to claim 1, wherein the interlayer film for laminated glass includes a polyester resin. The interlayer film for laminated glass includes a first layer and a second layer disposed on one surface side of the first layer,
The first layer comprises a polyester resin;
The roll body according to claim 1, wherein the second layer contains a polyvinyl acetal resin. The interlayer film for laminated glass includes a third layer disposed on a second surface side opposite to the one surface of the first layer,
The roll body according to claim 3, wherein the third layer includes a polyvinyl acetal resin.   The roll body according to any one of claims 1 to 4, wherein the winding core has irregularities on a surface around which the interlayer film for laminated glass is wound.   The roll body according to any one of claims 1 to 5, wherein an outer diameter of the roll body is 0.4 m or more.   The intermediate film for laminated glass is disposed between the first laminated glass member and the second laminated glass member after being unwound from the core, and is used for obtaining laminated glass. The roll body according to any one of -6.

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