JPH08295543A - Laminated soundproof window glass containing reformed medium layer and casing or housing provided with the glass - Google Patents

Abstract

PURPOSE: To produce a laminated glass having transparancy and damping properties, a soundproof window glass and a casing or housing having laminated glass as the pane by using a reformed olefin polymer contg. a carboxyl group as the medium layer. CONSTITUTION: A medium layer formed with a reformed olefin polymer and having 0.1-1.0mm thickness is interposed between the two opposed glass sheets, and a laminated glass is obtained with the ratio of the thickness of the medium layer to the overall thickness of the laminate adjusted to 1/3 to 1/30. The reformed olefin polymer is a copolymer or its ionomer and contains ethylene, 3-20wt.% α,β-unsaturated carboxylic acid and 0-25wt.% alkyl ester of α,β-unsaturated carboxylic acid, and the total content of the ethylene and α,β-unsaturated carboxylic acid is controlled to 8 to 45wt.%. The damping capacity (based on Tanδ) for the 100Hz- frequency vibration is controlled to >=0.1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated glass containing a modified core layer which is a laminate having a modified core layer having transparency and high vibration damping properties. Secondly, the present invention relates to a soundproof window glass based on the above laminated glass containing a core layer. Thirdly, the present invention relates to a windowed casing or housing having a window based on the soundproof window glass.

[0002]

2. Description of the Related Art Conventionally, what is marketed as "laminated glass" is one in which a celluloid plate is sandwiched between two glass plates, and it is aimed at avoiding translucency due to discoloration of the celluloid and reducing the price. There are commercially available ones in which an adhesive is only applied thinly between two plate glasses, and ones in which a synthetic resin plate such as polyvinyl chloride resin is sandwiched in place of a celluloid plate.

However, these laminated glasses do not always exhibit the expected effect on the damping property of the present invention, in particular, effective attenuation of audible sound (attenuation performance). As evidence of this, the one in which a polyvinyl chloride resin is sandwiched between plate glasses does not exhibit the soundproofing effect of the level of the present invention. The reason for this is that the purpose of conventional laminated glass development was to prevent the scattering of debris due to breakage of sheet glass, that is, to place it on the development of safety glass. That is, it is not surprising that the conventional laminated glass cannot be expected to exhibit the effect as so-called soundproof glass.

Another type of double glazing, which is expected to have a soundproof effect, is already on the market. This is a 1mm thick plate glass 2
The sheets are opposed to each other with a space of 8 mm, and a vacuum is applied between them. Since sound waves cannot penetrate the vacuum, it was expected that this would produce a considerable soundproofing effect, but the expected effect was not exhibited. For example, in a pachinko machine, the sound of metal balls colliding with the glass surface from each direction can be heard considerably on the opposite side of the double glazing, which makes people who stay in the vicinity of the table feel tired. The current situation.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to develop a laminated glass capable of suppressing or reducing impact noise such as noise caused by collision of metal balls as much as possible. Of course, there should be no need to have glass on both sides.
However, glass is the most promising surface material that exhibits the performance targeted by the present invention in terms of sliding friction resistance, scratch resistance, impact damage resistance, and the like.

[0006]

In order to solve the problems that cannot be realized by various conventional soundproof (silent) glasses, the present inventors have proposed the following modified laminated core layer-containing glass, The structure defined in the soundproof window glass as the base material, the casing or the housing in which it was mounted, was selected.

[1. Basic Structure of Laminated Glass] A modified core made of a modified olefin polymer having transparency, high damping property and sound deadening property between two plate glasses facing each other. In a laminated body in which layers are interposed, a modified olefin polymer containing a carboxyl group or a group capable of forming a carboxyl group or a modified olefin polymer having an ionic bond formed between the carboxyl group and a cation is formed. In addition to the thickness of the modified core layer being 0.1 to 1.0 mm, the ratio of the thickness to the total thickness of the laminate (modified core thickness / total thickness) = 1 / Laminated glass with a modified core layer of 3 to 1/30.

[2. Improved Structure 1 for Laminated Glass] The modified olefin polymer forming the modified core layer contains a carboxyl group contained in the base olefin polymer, and groups 1 to 3 of the periodic table. Item 1. The reforming according to the above item 1, which is formed by an olefin polymer forming an ionic bond with a group 3 metal cation or with a cation generated from a nitrogen atom constituting an amino group of amines. Laminated glass with a core layer.

[3. Improved Structure 2 of Laminated Glass] The modified olefin polymer forming the modified core layer is composed of ethylene units, α, β-unsaturated carboxylic acid units (UA) and α, β-unsaturation. The above-mentioned item 1 containing 3 to 20% (UA) and 0 to 25% (UD) of carboxylic acid alkyl ester unit (UD) on a weight basis, respectively, and satisfying 8 ≦ UA + UD ≦ 45%.
Or the laminated glass containing the modified core layer according to the item 2.

[4. Improved Structure 3 of Laminated Glass] The modified olefin polymer layer forming the modified core layer has a frequency of 10
The laminated glass with a modified core layer according to any one of Items 1 to 3, which is a layer of an ion-bonding olefin polymer having a damping capacity (based on Tan δ) of 0.1 or more against vibration of 0 Hz.

[5. Basic Structure of Soundproof Window Glass] A laminated glass in which a modified core layer is interposed between two plate glasses facing each other, and the modified core layer has transparency and Between a metal cation of Groups 1 to 3 of the periodic table having both high vibration damping property and sound deadening property, or with a cation selected from cations generated from nitrogen atoms constituting the amino group of amines In the laminated glass laminate with a modified core layer formed of an olefin polymer having an ionic bond formed therebetween, the thickness of the modified core layer is 0.1 to 1.0 mm. In addition, a soundproof window glass in which the ratio of the thickness to the total thickness of the laminate (modified core thickness / total thickness) = 1/3 to 1/30.

[6. Improved structure 1 for soundproof window glass] The ion-binding olefin polymer layer forming the modified core layer has a damping capacity (based on Tan δ) for vibration at a frequency of 100 Hz.
6. The soundproof window glass according to the above item 5, which is a layer having 0.1 or more.

[7. Improved Structure 2 of Soundproof Window Glass] The modified olefin polymer forming the modified core layer is an ethylene unit,
The α, β-unsaturated carboxylic acid unit (UA) and the α, β-unsaturated carboxylic acid alkyl ester unit (UD) are contained in an amount of 3 to 20% (UA) and 0 to 25% (UD), respectively, on a weight basis. , 8 ≦ UA + UD ≦ 45%, The soundproof window glass according to item 5 or 6 above.

[8. Basic Structure of Casing or Housing] A reforming core layer is interposed between two sheet glasses facing each other, and a damping capacity (based on Tan δ) for a vibration of a frequency of 100 Hz is set to 0. In one or more laminates, the thickness of the modified core layer is 0.1 to 1.0 mm, and the ratio of the thickness to the overall thickness of the laminate (modified core layer thickness / overall thickness). A casing or housing equipped with a soundproof window glass having a thickness of 1/3 to 1/30.

[9. Improved configuration 1 of casing or housing] The ion-binding olefin polymer layer forming the reformed core layer has a damping capacity (Tan) for vibration at a frequency of 100 Hz.
The casing or the housing according to the above item 8, wherein the laminated glass with a core layer having a value of 0.1 or more (on a δ basis) is used as the window plate.

[10. Improved structure 2 of casing or housing] The modified olefin polymer forming the modified core layer is composed of ethylene units, α, β-unsaturated carboxylic acid units (UA) and α, β-unsaturated units. Carboxylic acid alkyl ester unit (UD) is 3 to 20% (UA) and 0 to 25% by weight, respectively.
(UD) The casing or housing according to the above item 8 or 9, which contains (UD) and satisfies 8 ≦ UA + UD ≦ 45%.

<Preferred Embodiments of the Invention> The present invention can be divided into the following three kinds of embodiments: (1) transparency, soundproofness and high attenuation are provided between two glass sheets facing each other. Laminated glass with a modified core layer, which is a laminated body in which a modified core layer is also provided,
(2) Soundproof window glass using it as a base material, (3) Casing or housing in which it is mounted.

Each of these will be specifically described below in order. However, (2) and (3) correspond to the application of (1), so if we focus on (1), we cannot explain (2) and (3) again.

<< About Laminated Glass with Modified Core Layer >> The laminated glass with a modified core layer of the present invention is a flat glass having an arbitrary thickness, usually two flat glass sheets having a thickness of 0.8 mm or more. A modified core layer in which a transparent modified core layer formed of an ion-bonding olefin polymer described below is sandwiched between the layers, which are opposed to each other at an interval of usually 0.1 mm or more, preferably 0.3 mm or more. Is 0.1 to 1.0 mm, and the ratio of the thickness to the total thickness of the laminate (modified core layer thickness / total thickness) = 1/3 to 1/30, Preferably 1/3
It is necessary to be 1/20.

Here, the thickness of the plate glass used is originally arbitrary as described above, but a common value is 0.8 mm or more in consideration of the specifications of existing products, practical strength, transparency and the like. Two
The thickness of the sheet of glass does not have to be the same value, but it is usually the same value. It is preferable that the two glasses have the same quality. When different kinds of glass are used, warpage occurs in terms of coefficient of expansion, or even when the glass does not reach that extent, distortion is likely to remain inside. This often leads to destruction.

In order for the laminated glass containing the modified core layer of the present invention to exhibit the desired sound deadening property and / or vibration damping property, the thickness of the modified core layer is at least the above lower limit or more. It is necessary. Especially when a modified core layer having a thickness of about 0.01 mm, which is sufficiently less than this thickness, is used, its damping property (Tanδ
Does not meet the desired level.

In addition to the above, in the laminated glass of the present invention, it is necessary that the ratio of the thickness of the modified core layer to the total thickness thereof falls within the above range. The reason is that no matter how good the modified core layer has excellent damping performance, if the glass layers located on both sides of it are thick enough to exceed their damping capacity, the damping capacity of the core layer will be insufficient. It is demanded that the coming situation can occur.

<< Structure and Properties of Modified Core Layer >> Potential of modified olefin polymer used as a material for forming the modified core layer essential for producing the modified laminated glass of the present invention. A group of α-olefin polymers (including copolymers) containing a carboxyl group and a group capable of giving rise to them as described in detail in the latter part of this section are crystalline polymers ( "Resin" in a narrow sense) and low crystalline polymers and amorphous polymers (elastomers and thermoplastic elastomers)
Also includes. Useful variants of this type of modified copolymer include terpolymers of ethylene, methacrylic acid and methacrylic acid alkyl esters.

A powerful group of modified olefin polymers used as a material for forming the modified core layer essential for producing the modified laminated glass of the present invention is an ion-bonding olefin polymer or The thing called an ionomer can be mentioned. That is, the carboxyl group in the modified olefin polymer forms an ionic bond with a cation of a metal belonging to Groups 1 to 3 of the periodic table or with a cation generated from an amino group of an organic amine. In the present invention, this specific polymer is referred to as "ion-bonding olefin polymer".

However, no matter how excellent the sound deadening property and the vibration damping property (damping property) are, the one lacking transparency or the one colored in a dark color is the modified core of the present invention in terms of appearance. Does not fit into layers. In addition, the modified core layer should not undergo deterioration or decomposition under any of its molding processing conditions and lamination bonding conditions to the glass layer, and the discoloration observed as a result thereof,
Whatever peeling, cracking or embrittlement was observed is not suitable as the modified core layer of the product provided by the present invention.

Examples of the modifier (comonomer) that can be used to prepare the modified olefin polymer of the present invention include α, β-unsaturated carboxylic acids, their acid anhydrides and esters. Specifically, acrylic acid, methacrylic acid, maleic acid, maleic anhydride (maleic anhydride), fumaric acid, itaconic acid, itaconic anhydride, norbornene dicarboxylic acid (trade name "nadic acid", etc.) or norbornene dicarboxylic acid anhydride. (Trade name "Nadic acid anhydride" etc.). Appropriate selection and use of these are sufficient for ordinary purposes.

Among them, the modifiers often used are methacrylic acid or a combination of methacrylic acid and lower alkyl esters thereof, and one or more of these are usually used as a modifier.
The modified olefin polymer containing 30% by weight, preferably 4 to 15% by weight, shows good results in the form of the laminated glass of the present invention. Commonly used lower alkyl esters are methyl esters and ethyl esters. However, i-butyl ester may also be employed to achieve the objects of the invention.

The preferred properties of the ion-bonding olefin polymer are as follows: ◆ MFR (190 ° C; 2.16 kgf) for ethylene polymer
1 to 200 g / 10 min, preferably 2 to 100 g / 10 min ◆ Damping performance (soundproofing; vibration damping): 0.1 or more, preferably 0.12 or more based on Tanδ at a measured frequency of 100 Hz.

<< Procedure for Producing Laminated Glass with Modified Core Layer >> The procedure for producing the laminated glass with modified core layer of the present invention is as follows. For example, the above-mentioned modified polymer is sandwiched between two sheet glasses in a softened state or a melted state so that surface bonding is possible. Next, this three-layer body can be manufactured by thermally adhering it to a glass plate by means such as vacuum pressing. In addition to paying attention not to create bubbles during heat bonding work, it is necessary to carry out laminating work so that the thickness of the modified core layer in the obtained laminate conforms to the predetermined requirements. Is.

[0030]

EXAMPLES The present invention will be specifically described below based on examples, but the present invention is not limited thereto. Furthermore,
A comparative example will be described with reference to comparison with the effect of the example. ◆ Muffling (damping) test method As a test tool, an iron ball (diameter: 10 mm) and handle (length: 10)
0mm) is attached, and the sound produced when the iron ball at the tip taps the glass surface with the handle in hand is rated as follows by the result of hearing: ○: Noise reduction effect Passed Δ: There was a noise reduction effect (insufficient) ×: No noise reduction effect

[0031]

Examples 1 to 5 Various polyolefin resins listed in Table 1 or various types of modified resins thereof listed in Table 1 were sandwiched between two plate glasses (500 mm long × 500 mm wide × 1.7 mm thick) that face each other in a substantially vertical direction. The core layer is sandwiched, cushioning paper is laid on the surface of the plate glass, and it is pressed with a vacuum press (vacuum degree: -750 mmHg; press pressure 3 kg / cm ² G; temperature 150 ° C x 30 minutes) while preventing the destruction. Laminated glass containing various core layers was prepared.

The total thickness of the various laminated bodies was 3.8 mm, which was significantly thinner than the total thickness of 10 mm of the conventional intermediate vacuum glass, and the vibration damping test was conducted as follows. , The impact sound was extremely low, and it remained low. That is, the sound was at a level at which it was difficult to recognize that it was occurring. ● Silencer test: Iron ball on the surface (diameter 10mm)
Using a test tool with a handle (length 100 mm) attached to
While listening to the sound produced by holding the handle in the hand and tapping the glass surface with the iron ball at the tip, evaluate the sound also by measuring Tan δ at 23 ° C to evaluate the damping property (vibration damping property). [Refer to Table 1: Tan δ measurement result and silencing test result].

[0033]

[Comparative Examples 1 and 2] A laminated glass in which an EVA sheet (thickness: 0.4 mm; damping property: 0.07 based on Tan δ) is heat-fused between two flat glass sheets of the same standard as in Example 1. The same sound deadening test as in Example 1 was performed on (Comparative Example 1) and the laminated glass (Comparative Example 2) having an air layer (thickness: 0.4 mm) between the two sheet glasses. As a result, in all cases, it was evaluated that there was not much difference from the sound deadening property of the glass alone and the desired damping property was not recognized. The results are shown in Table 1.

[0034]

[Table 1]

<< Applications of Laminated Glass with Core Layer >>
The laminated glass with a core layer of the present invention is particularly advantageous in that the striking force of an object made of a hard substance such as a metal against the glass surface itself and the suppression by the absorption of the sound generated thereby or the almost disappearance can be reduced. It can be used for various purposes described below. ◆ A window plate of a game machine or the like in which an iron ball, which is a hard object such as a pachinko machine, can directly collide with a glass surface; ◆ A window plate of a casing or a housing that surrounds a noise source; ◆ A building window glass, for example, Music hall, music classroom,
A daylighting window in a room where a sound source such as a key-playing instrument such as a piano, a trumpet, a wind instrument such as a saxophone, or a hard sound such as a cymbal and / or a musical instrument that produces a sharp and high sound is installed in a musical instrument classroom or a house; For example, window plates for automobiles, trains, trains, ships, aircrafts, meter casings, etc.

[0036]

EFFECT OF THE INVENTION By using the laminated glass containing the core layer of the present invention itself, the soundproof window glass of the construction mainly composed of the laminated glass, and the casing or housing mounted with the soundproof window glass, the following various effects can be obtained. : (1) Prevention of noise generation by direct impact on glass (2) Monitoring of operating condition of housing equipment if used for casing or window plate of housing that contains hard sound, sharp and high frequency sound source Possible (3) Architecture For example, if it is used in a music hall, a music classroom (practice room), especially a musical instrument classroom such as a piano in a residential area, or a window of a musical instrument installation room such as a piano in a house, it is possible to prevent noise propagation to the neighborhood. (4) The soundproof window glass of the present invention can be attached to a window of a vehicle, a ship, an aircraft or the like. In particular, it is useful in combination with the advantage that it is excellent in soundproofing effect (vibration damping effect, damping effect) for a glass attached to a window which requires a surface wipe with a wiper.

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Claims (10)

[Claims] 1. A laminate in which a modified core layer formed of a modified olefin polymer having transparency, high damping properties and sound deadening properties is interposed between two sheet glasses facing each other, wherein a carboxyl group is used. Modified olefin polymer containing a group or a group capable of forming a carboxyl group, or a modified core layer formed of a modified olefin polymer in which an ionic bond is formed between the carboxyl group and a cation Is 0.1-
In addition to 1.0 mm, the ratio of the thickness to the total thickness of the laminate (modified core thickness / total thickness) = 1/3 to 1 /
A laminated glass with a modified core layer of 30. 2. The modified olefin polymer forming the modified core layer is between a carboxyl group contained in the base olefin polymer and a metal cation of Group 1 to Group 3 of the periodic table, or The laminated glass with a modified core layer according to claim 1, which is formed of an olefin polymer which forms an ionic bond with a cation generated from a nitrogen atom constituting an amino group of amines. 3. The modified olefin polymer forming the modified core layer comprises ethylene units and α, β-unsaturated carboxylic acid units (U).
A) and α, β-unsaturated carboxylic acid alkyl ester units
(UD) is 3-20% (UA) and 0-based on the weight basis, respectively.
Contains 25% (UD) and 8 ≦ UA + UD ≦ 45%
The laminated glass containing the modified core layer according to claim 1 or 2, which satisfies the above requirement. 4. The damping capacity (Tan) of the modified olefin polymer layer forming the modified core layer against vibration at a frequency of 100 Hz.
Laminated glass with a modified core layer according to any one of claims 1 to 3, which is a layer of an ion-bonding olefin polymer having a δ standard of 0.1 or more. 5. A modified laminated glass in which a modified core layer is interposed between two plate glasses facing each other, wherein the modified core layer has transparency, high damping property and sound deadening property. In the combined laminate, the modified core layer is formed of a modified olefin polymer containing a carboxyl group or a group capable of forming a carboxyl group, or an ionic bond is formed between the carboxyl group and a cation. And the modified core layer has a thickness of 0.1.
.About.1.0 mm and the ratio of the thickness to the total thickness of the laminated body (thickness of the modified core layer / total thickness) = 1/3 to 1
/ 30 soundproof window glass. 6. The ion-bonding olefin polymer layer forming the modified core layer is a layer having a damping capacity (based on Tan δ) of 0.1 or more for vibrations at a frequency of 100 Hz. Soundproof window glass. 7. The modified olefin polymer forming the modified core layer comprises ethylene units and α, β-unsaturated carboxylic acid units (U).
A) and α, β-unsaturated carboxylic acid alkyl ester units
(UD) is 3-20% (UA) and 0-based on the weight basis, respectively.
Contains 25% (UD) and 8 ≦ UA + UD ≦ 45%
The soundproof window glass according to claim 5 or 6, which satisfies. 8. A laminated body having a modified core layer interposed between two plate glasses facing each other and having a damping capacity (based on Tan δ standard) of 0.1 or more for vibrations at a frequency of 100 Hz. In addition to the thickness of the core layer being 0.1 to 1.0 mm, the ratio between the thickness and the total thickness of the laminate (modified core thickness / total thickness) = 1/3 to 1 Casing or housing equipped with / 30 soundproof window glass. 9. The high molecular weight layer forming the core layer has a damping capacity (on a Tan δ basis) of 0.1 at a frequency of 100 Hz.
The casing or housing according to claim 7, wherein the laminated glass containing one or more core layers is used as a window plate. 10. The modified olefin polymer forming the modified core layer comprises ethylene units and α, β-unsaturated carboxylic acid units.
(UA) and α, β-unsaturated carboxylic acid alkyl ester units (UD) are 3 to 20% (UA) and 0% by weight, respectively.
Up to 25% (UD), and 8 ≦ UA + UD ≦ 45
% Or a casing or housing according to claim 8 or 9.