JPH04361034A - Safety glass made of synthetic resin and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain safety glass made of a synthetic resin having high adhesiveness, excellent impact resistance and durability by improving not only the adhesiveness of a polycarbonate resin plate and an intermediate bonding layer but also the intermediate bonding layer and other impact-resistant acrylic resin plate. CONSTITUTION:Safety glass made of a synthetic resin is constituted by bonding a polycarbonate resin plate A and an impact-resistant acrylic resin plate C through a thermoplastic polyurethane intermediate bonding layer B composed of a reaction product of nonyellowing diisocyanate, polyether diol and a curing agent and prepared by pressing the laminate of the polycarbonate resin plate A, the thermoplastic polyurethane intermediate bonding layer B and the impact- resistant acrlic resin plate C at 100-150 deg.C under pressure of 5-50kg/cm<2> by a hot press.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to synthetic resin safety glass having excellent impact resistance and durability, and a method for producing the same.

0002

2. Description of the Related Art In general, safety glass is widely used as glazing materials for public facilities, sports facilities, etc., partitions for bank counters, security doors, and glazing materials for various vehicles. Its structure is such that a plurality of sheets of inorganic glass, or a portion thereof, are replaced with organic glass, ie, a synthetic resin transparent plate, and these are bonded together via a polyvinyl butyral resin sheet as an intermediate bonding layer.

0003

[Problems to be Solved by the Invention] However, such conventional safety glasses do not necessarily have high impact resistance, and further improvements in safety have been desired.

[0004] Therefore, conventionally, safety glass has been developed which consists only of synthetic resin transparent plates instead of inorganic glass. Conventional safety glass made of synthetic resin is used, for example, as windshield glass for aircraft, and consists of multiple polycarbonate resin transparent plates placed next to each other. They are bonded via an intermediate bonding layer made of plastic polyurethane resin (see, for example, Japanese Patent Publication No. 12520/1983).
.

However, such conventional safety glass made of synthetic resin is highly evaluated in terms of initial safety due to the inherent high impact resistance of the polycarbonate resin used. Since the adhesive strength between the plate and the intermediate bonding layer is low, there are problems in that peeling occurs at the interface over time, resulting in devitrification and distortion of the transmitted image, and low water resistance and moisture resistance.

[0006] In order to solve the above-mentioned problems of the prior art, the inventors first attempted to improve the adhesiveness between the synthetic resin transparent plate and the intermediate bonding layer, particularly by using a specific thermoplastic polyurethane as the intermediate bonding layer. We proposed a synthetic resin safety glass with improved adhesion in which a polycarbonate resin transparent plate and an acrylic resin transparent plate were bonded together via this specific thermoplastic polyurethane intermediate bonding layer (Patent Application No. 67
(See No. 171).

However, although the previously proposed safety glass made of synthetic resin does improve the adhesion between the polycarbonate resin and the intermediate bonding layer, the adhesion between the intermediate bonding layer and the other acrylic resin transparent plate is poor. , which had the problem of being relatively weak.

[0008] In order to solve the above-mentioned problem, the inventors conducted further intensive research, and by selecting an impact-resistant acrylic resin plate as the acrylic resin transparent plate,
Discovered that it was possible to produce synthetic resin safety glass that had improved not only the adhesiveness between the polycarbonate resin plate and the intermediate bonding layer, but also the adhesiveness between the intermediate bonding layer and the other transparent resin plate, and completed this invention. I ended up doing it.

An object of the present invention is to significantly improve the adhesion between a synthetic resin transparent plate, particularly a polycarbonate resin plate and an impact-resistant acrylic resin plate, and an intermediate bonding layer, thereby eliminating the peeling phenomenon that occurs over time as in the past. The present invention aims to provide a safety glass made of synthetic resin that has excellent water resistance and moisture resistance, and has further improved impact resistance, without causing devitrification or distortion of transmitted images, and a method for producing the same. There is something to do.

0010

[Means for Solving the Problems] In order to achieve the above object, the first invention of the present invention provides a polycarbonate resin plate and an impact-resistant acrylic resin plate, which are made of a non-yellowing diisocyanate, a polyether diol, and a curing agent. The gist is a synthetic resin safety glass bonded via a thermoplastic polyurethane intermediate bonding layer made of a reaction product of.

[0011] A second invention of the present invention is a method for producing the above synthetic resin safety glass, in which a polycarbonate resin plate and an impact-resistant acrylic resin plate are mixed with a non-yellowing diisocyanate, a polyether diol, and a curing agent. These laminates are stacked with a thermoplastic polyurethane intermediate bonding layer made of a reaction product interposed therebetween, and the laminates are heated to a temperature of 1 by hot pressing.
The gist of this paper is a method for producing safety glass made of synthetic resin, which is characterized by heating and pressurizing at a temperature of 00 to 150°C and a pressure of 5 to 50 kg/cm2.

[0012] In the above, the synthetic resin transparent plate constituting the synthetic resin safety glass according to the present invention is a polycarbonate resin plate and an impact-resistant acrylic resin plate. These resin plates themselves are substantially transparent, have smooth surfaces, and are flat as a whole. Note that the practical side of these resin transparent plates may be subjected to hardness treatment, antifogging treatment, or the like.

The thickness of the transparent resin plate is not particularly limited, but is usually selected within the range of 1 mm to 30 mm for practical reasons.

The impact-resistant acrylic resin plate is made of a diene copolymer (a) that has excellent rubber properties in a low temperature range and has a controlled refractive index. A monomer containing methyl methacrylate as a main component or a mixture thereof is graft-polymerized onto the double-structure elastic body (I) obtained by wrapping the cross-linked acrylic ester copolymer (b), and the graft It is made from a resin composition that is a blend of a specific amount of copolymer (II) and a specific amount of methacrylic resin (III) whose main constituent unit is methyl methacrylate.

To explain in more detail about such an impact-resistant methacrylic resin composition, the impact-resistant methacrylic resin composition contains 30 to 80% by weight of 1,3-butadiene.
, 20 to 70% by weight of at least one acrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms, 0 to 30% by weight of another copolymerizable monofunctional monomer, and a copolymerizable polyfunctional monomer. Acrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms is added to the outside of 5 to 75 parts by weight of diene copolymer (a) obtained by polymerizing a mixture of monomers consisting of 0 to 5% by weight of monomers. 69.9 to 89.9% by weight of at least one of the above and styrene alone or a mixture of styrene and its derivatives 10
~30% by weight and 2 carbon-carbon double bonds in one molecule
A double layer in which 25 to 95 parts by weight of a crosslinked acrylic acid ester copolymer (b) is formed in the outer layer by polymerizing a monomer mixture consisting of 0.1 to 10% by weight of a polyfunctional monomer having 1 or more polyfunctional monomers. In the presence of 100 parts by weight of structural elastic body (I) latex,
80 to 100% by weight of methyl methacrylate, 0 to 20% by weight of at least one type of acrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms, and 0 to 10% by weight of another vinyl monomer copolymerizable with this. After polymerizing 5 to 1000 parts by weight of a monomer or a mixture thereof (c) consisting of 5 to 1000 parts by weight, the resulting multilayer structure graft copolymer (II), 80 to 100 weight % of methyl methacrylate units, and other copolymerizable methacrylic resin (III) consisting of 0 to 20% by weight of monomer units of
are mixed so that the content of the double structure elastic body (I) is 1 to 50% by weight, and the impact-resistant acrylic resin board is made of such an impact-resistant methacrylic resin composition. It is manufactured from a resin obtained by copolymerizing.

When producing an impact-resistant acrylic resin plate, the refractive index of the resin phase obtained in each polymerization step is made as similar as possible in order to impart good transparency to the resulting impact-resistant acrylic resin plate. or very close approximation is necessary.

[0017] Furthermore, the resulting impact-resistant acrylic resin plate has the following properties:
In order to achieve a balance between transparency, surface appearance, and impact resistance performance, it is also necessary to consider the diameter of the rubber particles to be dispersed. Such impact-resistant acrylic resin plates are described in detail in, for example, Japanese Patent Publication No. 2-48176.

The impact-resistant acrylic resin plate may be manufactured by known emulsion polymerization, suspension polymerization, and bulk polymerization methods.

Here, the adhesion between the conventional acrylic resin plate and the intermediate bonding layer was relatively weak, but by changing this acrylic resin plate to an impact-resistant acrylic resin plate, the adhesiveness between the intermediate bonding layer and the intermediate bonding layer was relatively weak. The adhesion of the polycarbonate resin and the intermediate bonding layer has been significantly improved, and the impact resistance has been significantly improved, increasing the practical safety of synthetic resin safety glass. However, it will be further improved.

[0020] Furthermore, according to the above-mentioned impact-resistant acrylic resin plate,
Other properties, especially initial appearance such as transparency, water resistance, moisture resistance, peeling, devitrification, and appearance change over time, hot press molding temperature and molding pressure are also the same as acrylic resin plates, and are completely No problem.

By the way, the thermoplastic polyurethane intermediate bonding layer is transparent and is made of a reaction product of a non-yellowing diisocyanate, a polyether diol, and a curing agent.

Examples of the non-yellowing diisocyanate include aliphatic diisocyanate compounds such as hexamethylene diisocyanate, tetramethylene diisocyanate, dodecamethylene diisocyanate, 2,4,4-trimethyl-1,6-hexane diisocyanate,
Bis(4-isocyanatecyclohexyl)methane, 2
, 2-bis(4-isocyanatecyclohexyl)propane, 1,4-cyclohexyl diisocyanate, 1-
Examples include alicyclic diisocyanate compounds such as methyl-2,4-(or 2,6)-diisocyanate cyclohexane, and mixed aliphatic/alicyclic diisocyanate compounds such as isophorone diisocyanate.

Next, polyether diol is a compound formed by adding a monoepoxide typically having 2 to 4 carbon atoms or tetrahydrofuran to two types of initiators, such as polyoxytetrahydrofuran having an oxymethylene group. They are methylene diol, polyoxyalkylene diol having an oxypropylene group or an oxyethylene group and an oxypropylene group, and a polyether diol having these oxyalkylene groups and an oxytetramethylene group.

[0024] Further, the curing agent may include, for example, ethylene glycol, fatty acid diols such as 1,3-propanediol, 1,4-butanediol, and 1,6-hexanediol, amino alcohols such as monoethanolamine, and 1, Examples include diamines such as 2-ethanediamine.

The intermediate bonding layer of the synthetic resin safety glass according to the present invention is a film-like body made of a reaction product of the above-described non-yellowing diisocyanate, polyether diol, and a hardening agent. is not particularly limited, and may be produced by a conventional method for producing a thermoplastic polyurethane resin film, such as an extrusion method.

The thickness of the intermediate bonding layer is 0.03 mm to 8.0 mm.
It is selected in the range of 0 mm, preferably 0.5 mm to
The range is 5.0 mm.

[0027] Here, the thickness of the intermediate bonding layer is 0.03 m.
If it is too thin (less than m), uniform adhesion between the intermediate bonding layer and the polycarbonate resin plate and the impact-resistant acrylic resin plate becomes difficult, and the shock absorption performance and internal stress relaxation performance deteriorate, which is not preferable.

Furthermore, even if the thickness of the intermediate bonding layer is too thick, exceeding 5.0 mm, it is no longer possible to expect an increase in shock absorption performance or internal stress relaxation performance, but rather increases the weight and reduces the amount of material used. This is not preferable because it increases the number of times and is uneconomical.

The thickness of the intermediate bonding layer is appropriately determined within the above range depending on the performance required for the intermediate bonding layer such as adhesive strength and impact strength, and the use of the resulting synthetic resin safety glass. It is something that will be done.

Next, the laminated structure and manufacturing method of the synthetic resin safety glass of the present invention will be described.

Referring to FIGS. 1 and 2, first, regarding the laminated structure of the synthetic resin safety glass, thermoplastic polyurethane is placed between the polycarbonate resin transparent plate (A) and the impact-resistant acrylic resin transparent plate (C). An integrated structure is formed by heating and pressing through an intermediate bonding layer (B) made of a resin film.

Note that, as shown in FIG. 3, the intermediate bonding layer (B
) may be used to further laminate an impact-resistant acrylic resin plate (C) made of the same material on the other side of the impact-resistant acrylic resin plate (C).

Furthermore, as shown in FIG. 4, an acrylic resin plate (D) made of another material may be laminated on the other side of the impact-resistant acrylic resin plate (C). In this case, the impact-resistant acrylic resin plate (C) and the acrylic resin plate (D) may be bonded at the same time as molding without using an adhesive by a multilayer extrusion method, or by a hot press method without using an adhesive. This may be done in advance without any intervention. Of course, both resin plates may be joined via a transparent adhesive.

[0034] Furthermore, in the method for producing safety glass made of synthetic resin according to the present invention, the polycarbonate resin plate (A) and the impact-resistant acrylic resin plate (C) are mixed with a non-yellowing diisocyanate, a polyether diol, and a curing agent. Stacked with a thermoplastic polyurethane intermediate bonding layer (B) made of a reaction product interposed therebetween, these laminates are hot pressed at a temperature of 100 to 150°C and a pressure of 5 to 50 kg/cm.
2. They are heated and pressurized and integrated under the following conditions.

[0035]Heating conditions are such that the temperature of the laminate, especially the intermediate bonding layer (B), is 100 to 150°C, preferably 120 to 140°C. Here, if the heating temperature is less than 100°C, the adhesion between the intermediate bonding layer (B), the polycarbonate resin plate (A) and the impact-resistant acrylic resin plate (C) will be insufficient, and good impact strength will not be obtained. . Also, if the heating temperature exceeds 150℃,
This is not preferable because the intermediate bonding layer (B) may soften and flow, or in some cases, the polycarbonate resin plate (A) or the impact-resistant acrylic resin plate (C) itself may flow. Therefore, it goes without saying that the heating temperature should be kept within a range that does not cause the intermediate bonding layer (B), the polycarbonate resin plate (A), or the impact-resistant acrylic resin plate (C) to melt and flow unnecessarily.

[0036] Regarding the pressurizing conditions, the laminate is
50kg/cm2, preferably 10-40kg/cm
2 pressure shall be applied uniformly. Here, if this pressure is less than 5 kg/cm2, the adhesion between the polycarbonate resin plate (A) and the impact-resistant acrylic resin plate (C) and the intermediate bonding layer (B) will be insufficient, and air bubbles will occur between the layers. This is undesirable because it not only causes a loss of light but also significantly deteriorates the fluoroscopic performance.

Further, if the pressure exceeds 50 kg/cm2, the intermediate bonding layer (B) becomes easy to flow, which is not preferable. Therefore, it goes without saying that in this case as well, the pressure should be kept within a range that does not cause the intermediate bonding layer (B) to melt and flow unnecessarily.

[0038] When heating and pressing the laminate by hot pressing, a metal plated plate or the like having a mirror-like surface, which is slightly larger in size than the laminate material normally used for laminating thermoplastic synthetic resin transparent plates, etc. is used. The laminated materials stacked in the order shown in Figure 1 above are inserted between these metal plated plates, etc., and these are further inserted between the hot plates of a hot press and pressed together, under the above heating and pressing conditions. It is designed to be laminated and integrated.

In this case, a plurality of units of laminated material of synthetic resin safety glass are successively inserted and stacked between a plurality of metal plated plates, etc., and these are inserted between a number of flat heating plates to form a so-called It is also possible to adopt a method of improving productivity by integrating heating and pressing at once using a multi-stage press method.

[0040]

[Operation] According to the synthetic resin safety glass of the present invention, the polycarbonate resin plate (A) and the impact-resistant acrylic resin plate (C) are made of a reaction product of non-yellowing diisocyanate, polyether diol, and a curing agent. The polycarbonate resin (A) and the intermediate bonding layer (B) are bonded via the thermoplastic polyurethane intermediate bonding layer (B).
), uniform adhesion and high adhesion strength are obtained not only in adhesion between the intermediate bonding layer (B) and the other impact-resistant acrylic resin plate (C), resulting in significantly improved impact resistance. The peeling phenomenon that occurs over time can be prevented. In addition, synthetic resin safety glass does not cause devitrification or distortion of perspective images, and has excellent water resistance and moisture resistance.

[0041] Furthermore, in the method of the present invention, the polycarbonate resin plate (A) and the impact-resistant acrylic resin plate (C) are made of a thermoplastic polyurethane made of a reaction product of a non-yellowing diisocyanate, a polyether diol, and a curing agent. The system is stacked with an intermediate bonding layer (B) interposed in between, and these laminates are heated and pressed under specific temperature and pressure conditions using a hot press, and as described above, synthetic resin safety glass with excellent quality is produced. , which can be manufactured very efficiently and reliably.

[0042]

EXAMPLES Next, examples of the present invention will be described together with comparative examples.

Examples 1 to 4 and Comparative Examples 1 to 8 In these Examples and Comparative Examples, synthetic resin safety glasses shown in FIGS. 1, 2, and 4 were investigated.

First, for each Example and Comparative Example, a polycarbonate resin plate (A), an impact-resistant acrylic resin plate (C), and an intermediate bonding layer (B) were prepared according to the laminated structure shown in Table 1. The contents of the prepared laminated materials are as follows. In addition, the dimensions of the laminated material are:
Both were 500 mm x 1000 mm.

A: Polycarbonate resin transparent plate (manufactured by Tsutsunaka Plastic Industries Co., Ltd., trade name Polycarbonate E)
C100) B1: Intermediate bonding layer Thermoplastic polyurethane containing non-yellowing isocyanate and polyether diol as main reaction components (abbreviated as polyether thermoplastic polyurethane)
(Manufactured by Molton International Co., Ltd., trade name Molsen PE193) B2: Intermediate bonding layer for comparative example Thermoplastic polyurethane (abbreviated as polyester thermoplastic polyurethane) containing aromatic diisocyanate and polyester diol as main reaction components (Nippon Miractran Co., Ltd.) (manufactured by Mitsubishi Rayon Co., Ltd., product name: Miractran E780)
Product name Acrypet RH-70) D: MMA resin transparent plate (methyl methacrylate type 10
0%) E: PS resin transparent plate for comparative example (polystyrene-based 10
0%) Next, these laminates were heated and pressurized under specific temperature and pressure conditions to produce synthetic resin safety glass.

Here, as shown in the table, the heating and pressing means was a hot press method for Examples 1 to 4, Comparative Examples 1 to 5, and Comparative Example 8, and an autoclave method for Comparative Examples 6 and 7. Each method was adopted, and their heating and pressurizing conditions are summarized in Table 1.

In Examples 2 and 4, the impact-resistant acrylic resin plate (C) and the MMA resin transparent plate (D) were bonded in advance by the usual hot press method, and then the polycarbonate resin plate (A) and the impact-resistant acrylic resin plate (A) were bonded together. The acrylic resin plate (C) was heated and pressed through the intermediate bonding layer (B) under the specific temperature and pressure conditions shown in Table 1.

In addition, in the autoclave method, the laminate was sandwiched between two glass plates larger in size than the laminate material, the inside of the autoclave was evacuated and preheated at 100°C, and then heated and pressurized under the above setting conditions. .

Initial performance evaluation and durability performance evaluation were conducted for each sample of the synthetic resin safety glass thus manufactured. The durability performance of the safety glass was evaluated by conducting a durability acceleration test of the safety glass, that is, a cold/heat test, a moisture resistance test, and a boiling test.

The test method for each performance evaluation item is as follows.

[0051] Initial performance evaluation ■ Check for layer peeling immediately after manufacturing.

■Appearance of safety glass immediately after manufacture.

[0053] Adhesive strength: Measured by the peeling (180°) method, and the measured value (kg/cm2) was recorded.

a interface=polycarbonate resin transparent plate (A
) and intermediate bonding layer (B) adhesive interface b interface = adhesive interface between intermediate bonding layer (B) and impact-resistant acrylic resin transparent plate (C) ■Impact resistance: weight 2 kg, radius of curvature of striking center tip: R =3/
When an 8-inch steel weight is dropped perpendicularly from a height of 8 m onto the impact-resistant acrylic resin transparent plate (C) side of each synthetic resin safety glass sample, the presence or absence of layer peeling, presence or absence of weight penetration, and The presence or absence of whitening was observed.

[0055] Durability performance evaluation ■Cold heat test: After leaving the sample at 70°C for 2 hours,
After being left at -20℃ for 2 hours from ℃ to -20℃, and then exposed to an atmosphere of 2 hours from -20℃ to 70℃ for 10 cycles, the presence or absence of layer delamination and safety glass The appearance was observed.

■Moisture resistance test: sample at 55°C, relative humidity 98
%RH for two weeks, the presence or absence of delamination and the appearance of the safety glass were observed.

[0057] Boiling test: After the sample was left in boiling water for 2 hours, the presence or absence of layer peeling and the appearance of the safety glass were observed.

The results of each performance evaluation are summarized in Table 2.

[0059]

[Table 1]

[0060]

[Table 2]

As is clear from Tables 1 and 2 above, the synthetic resin safety glasses according to Examples 1 to 4 of the present invention showed no delamination immediately after production and an excellent appearance in the initial performance evaluation. Of course, it also has high adhesive strength, especially the adhesive interface (a) between the polycarbonate resin transparent plate (A) and the intermediate bonding layer (B).
It not only has good adhesion at the interface) but also has good adhesion at the intermediate bonding layer (
B) and the adhesive interface between the impact-resistant acrylic resin transparent plate (C) (
The adhesiveness equivalent to that of the a-interface can also be exhibited at the b-interface.

[0062] In the impact resistance test, there was no delamination, and no weight penetration or whitening was observed, and the impact resistance was significantly improved and the product had excellent quality.

Further, according to the present invention, there was no delamination in any of the accelerated tests for evaluation of durability performance, and the product had an excellent appearance.

On the other hand, according to the synthetic resin safety glass of Comparative Example 1 in which the polycarbonate resin transparent plate (A), the intermediate bonding layer (B1), and the MMA plate (D) were laminated, immediately after manufacture, Although no delamination was observed, the adhesive strength was low and delamination occurred during the impact test.

Further, in the synthetic resin safety glasses of Comparative Examples 2 and 3, immediately after manufacture, although no layer peeling was observed, cloudy appearance was observed. In addition, the adhesive strength is low, and delamination occurs in impact resistance tests.
In addition, whitening occurred in the external appearance, and in the accelerated test for evaluating durability performance, layer peeling occurred and yellowing was observed in the external appearance.

[0066] In Comparative Examples 4 and 5, the polycarbonate resin plate (A) and impact-resistant acrylic resin plate (C) were not bonded to the intermediate bonding layer (B) at the initial stage, resulting in layer peeling. It was not possible to test the durability performance due to the appearance of bubbles.

[0067] In addition, in the synthetic resin safety glass produced by the autoclave method of Comparative Examples 6 and 7, although no layer peeling was observed immediately after manufacture, bubbles were formed in the appearance. Furthermore, the adhesive strength was low, and delamination occurred in the impact resistance test. In addition, in an accelerated test for evaluating durability performance, although no layer peeling occurred, bubbles were observed in the external appearance.

Furthermore, the polycarbonate resin transparent plate (A) of Comparative Example 8, the intermediate bonding layer (B1), and the PS plate (E)
Although no delamination was observed immediately after manufacture, adhesive strength was low, and delamination occurred in the impact test.

The synthetic resin safety glass according to the present invention can be effectively used, for example, as a glazing material for public facilities and sports facilities, partitions for bank counters, security doors, and glazing materials for various vehicles. .

[0070]

Effects of the Invention As mentioned above, the synthetic resin safety glass of the present invention has a polycarbonate resin plate (A) and an impact-resistant acrylic resin plate (C) made of non-yellowing diisocyanate,
Since the polycarbonate resin plate (A) and the intermediate bonding layer (B) are bonded together via the thermoplastic polyurethane intermediate bonding layer (B) made of a reaction product of polyether diol and a curing agent, Not only the adhesiveness but also the adhesiveness between the intermediate bonding layer (B) and the other impact-resistant acrylic resin plate (C) can be improved, and the peeling phenomenon that occurs over time as in the conventional method can be prevented. Therefore, it does not cause devitrification or distortion of a perspective image, has very good impact resistance and durability, and has high water resistance and moisture resistance.

In particular, since a specific thermoplastic polyurethane obtained by a reaction containing non-yellowing diisocyanate and polyether diol as main components is used as the intermediate bonding layer (B), there is an advantage that there is little discoloration over time. There is.

[0072] In addition, as described above, the method for producing safety glass made of synthetic resin according to the present invention involves combining the polycarbonate resin plate (A) and the impact-resistant acrylic resin plate (C) with non-yellowing diisocyanate, polyether diol, and a thermoplastic polyurethane-based intermediate bonding layer (B) consisting of a reaction product of a curing agent, and the laminate is hot pressed at a temperature of 100 to 150°C and a pressure of 5 to 50°C.
kg/cm2, and according to the method of the present invention, synthetic resin safety glass having excellent quality as described above can be manufactured very efficiently and reliably. play.

[Brief explanation of the drawing]

FIG. 1 is an enlarged exploded cross-sectional view of the main parts of a two-layered synthetic resin safety glass according to the present invention.

FIG. 2 is an enlarged sectional view of essential parts of the synthetic resin safety glass.

FIG. 3 is an enlarged cross-sectional view of essential parts of the three-layered safety glass made of synthetic resin according to the present invention.

FIG. 4 is an enlarged sectional view of essential parts showing another specific example of the three-layered synthetic resin safety glass according to the present invention.

[Explanation of symbols]

A Polycarbonate resin transparent plate B
Intermediate bonding layer C made of polyether thermoplastic polyurethane resin Impact-resistant acrylic resin plate

Claims (3)

[Claims] Claim 1: A polycarbonate resin plate (A) and an impact-resistant acrylic resin plate (C) are bonded to a thermoplastic polyurethane intermediate bonding layer (B) made of a reaction product of a non-yellowing diisocyanate, a polyether diol, and a curing agent. ) Synthetic resin safety glass bonded through. 2. A shock-resistant acrylic resin plate (C) made of the same material or an acrylic resin plate (D) made of a different material is further bonded to the other surface of the shock-resistant acrylic resin plate (C). Safety glass made of synthetic resin. 3. The polycarbonate resin plate (A) and the impact-resistant acrylic resin plate (C) are bonded together with a thermoplastic polyurethane intermediate bonding layer (B) made of a reaction product of non-yellowing diisocyanate, polyether diol, and a curing agent. ) and stack these laminates by hot pressing at a temperature of 100-150°C and a pressure of 5-50 kg/cm2.
A method for producing safety glass made of synthetic resin, which is characterized by heating and pressurizing it under the following conditions.