JPH04339646A - Safety glass made of synthetic resin and preparation thereof - Google Patents

Abstract

PURPOSE:To prepare the title safety glass having high adhesiveness and excellent in impact resistance and durability by improving not only the adhesiveness of a polycarbonate resin plate and an intermediate bonding layer but also the adhesiveness of the intermediate bonding layer and other acrylic resin plate. CONSTITUTION:Safety glass made of a synthetic resin is formed by bonding a polycarbonate resin plate (A) and a styrene/methyl methacrylate copolymer resin plate (C) through a thermoplastic polyurethane intermediate bonding layer (B) composed of a reaction product of non-yellowing diisocyanate, polyether diol and a curing agent. This safety glass is prepared by heating and pressing the laminate of the polycarbonate resin plate (A), the specific thermoplastic polyurethane intermediate bonding layer (B) and the styrene/methyl methacrylate copolymer resin plate (C) at 100-150 deg.C under the 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 a styrene-methyl methacrylate copolymer resin plate as the acrylic resin transparent plate, it was found that the polycarbonate resin plate and We have discovered that it is possible to produce synthetic resin safety glass that has improved not only the adhesiveness with the intermediate bonding layer, but also the adhesiveness between the intermediate bonding layer and the other resin transparent plate, and have completed this invention. .

An object of the present invention is to improve the adhesion between a synthetic resin transparent plate, especially a polycarbonate resin plate and a styrene-methyl methacrylate copolymer resin plate, and an intermediate bonding layer, thereby eliminating the peeling that occurs over time as in the past. It is an object of the present invention to provide a safety glass made of synthetic resin which prevents this phenomenon, thereby causing no devitrification or distortion of a transmitted image, and which has excellent water resistance and moisture resistance, and a method for producing the same.

0010

[Means for Solving the Problems] In order to achieve the above object, the first invention of the present invention is to combine a polycarbonate resin plate and a styrene-methyl methacrylate copolymer resin plate with non-yellowing diisocyanate, polyether diol ,
The gist is a synthetic resin safety glass bonded via a thermoplastic polyurethane intermediate bonding layer made of a reaction product of a curing agent and a curing agent.

A second aspect of the present invention is a method for producing the above synthetic resin safety glass, in which a polycarbonate resin plate and a styrene-methyl methacrylate copolymer resin plate are mixed with non-yellowing diisocyanate, polyether diol, and a curing agent through a thermoplastic polyurethane intermediate bonding layer, and heat and press these laminates using a hot press at a temperature of 100 to 150°C and a pressure of 5 to 50 kg/cm2. The gist of this paper is a method for manufacturing synthetic resin safety glass, which is characterized by:

[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 a styrene-methyl methacrylate copolymer resin plate. These resin plates themselves are substantially transparent, have smooth surfaces, and are flat as a whole. In addition, the practical side of these resin transparent plates is
A treatment such as hardness treatment or antifogging treatment may be applied.

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 styrene-methyl methacrylate copolymer resin plate is manufactured from a resin obtained by copolymerizing 10 to 90% by weight of styrene and 90 to 10% by weight of methyl methacrylate. The copolymer resin plate may be manufactured by a known emulsion polymerization method, suspension polymerization method, or bulk polymerization method.

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 a styrene-methyl methacrylate copolymer resin plate, Adhesion with the intermediate bonding layer has been significantly improved, and adhesive strength equivalent to that between polycarbonate resin and the intermediate bonding layer can be obtained, further improving the practical safety of synthetic resin safety glass. It is.

[0016] In the above, the styrene content is 1
If the styrene content is less than 0% by weight, the adhesion with the intermediate bonding layer will not be improved, and if the styrene content exceeds 90% by weight, the weather resistance will deteriorate, which is not preferable.

[0017] If the styrene content in the styrene-methyl methacrylate copolymer resin plate is within the range of 10 to 90% by weight, the styrene content of the styrene-methyl methacrylate copolymer resin plate is greater than that of the methyl methacrylate-only resin plate or the styrene-only resin plate. The adhesion of the material is improved.

Further, the styrene content in the styrene-methyl methacrylate copolymer resin plate is within the range of 10 to 90.
Within the weight percentage range, other properties, especially initial appearance such as transparency, water resistance, moisture resistance, peeling over time, devitrification,
The change in appearance, hot press molding temperature and molding pressure are also the same as those of the acrylic resin plate, and there are no problems at all.

The styrene content in the styrene-methyl methacrylate copolymer resin plate is preferably in the range of 20 to 65% by weight.

[0020] The styrene-methyl methacrylate copolymer resin plate may also be made of a resin copolymerized with other copolymerizable monomers, as long as the adhesion to the intermediate bonding layer is not reduced. .

Here, for example, a copolymer resin plate in which up to 50% of styrene is replaced with other aromatic vinyl monomers such as α-methylstyrene or vinylnaphthalene, or alternatively with up to 50% of methyl methacrylate Copolymer resin plates in which the amount is replaced with other acrylate monomers such as ethyl methacrylate, butyl methacrylate, or acrylonitrile are also included in the above-mentioned styrene-methyl methacrylate copolymer resin plates.

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 having 2 to 4 carbon atoms or tetrahydrofuran to two types of initiators, for example, 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.

[0025] Furthermore, the curing agent may be, for example, ethylene glycol, fatty acid diols such as 1,3-propanediol, 1,4-butanediol, 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-mentioned 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.

[0028] 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 styrene-methyl methacrylate copolymer resin plate becomes difficult, and the shock absorption performance and internal stress relaxation performance decrease, which is undesirable. .

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 intended 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, there is a layer between the polycarbonate resin transparent plate (A) and the styrene-methyl methacrylate copolymer resin transparent plate (C). , are heated and pressed to form an integrated structure via an intermediate bonding layer (B) made of a film-like body of thermoplastic polyurethane resin.

Note that, as shown in FIG. 3, the intermediate bonding layer (B
) may be used to further laminate a styrene-methyl methacrylate copolymer resin plate (C) made of the same material on the other side of the styrene-methyl methacrylate copolymer 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 styrene-methyl methacrylate copolymer resin plate (C). In this case, the styrene-methyl methacrylate copolymer 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. Again, this may be done in advance without using an adhesive. Of course, both resin plates may be joined via a transparent adhesive.

[0035] Furthermore, in the method for producing safety glass made of synthetic resin according to the present invention, the polycarbonate resin plate (A) and the styrene-methyl methacrylate copolymer resin plate (C) are mixed with non-yellowing diisocyanate, polyether diol, and a thermoplastic polyurethane intermediate bonding layer (B) consisting of a reaction product of a curing agent and a curing agent, and the laminate is heated with a hot press at a temperature of 100 to 150°C and a pressure of 5 to 50 kg/cm2. It is pressurized and integrated.

[0036]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) and the polycarbonate resin plate (A) and the styrene-methyl methacrylate copolymer resin plate (C) will be insufficient, resulting in poor impact strength. is not obtained. In addition, if the heating temperature exceeds 150°C, the intermediate bonding layer (B) may soften and flow, or in some cases, the polycarbonate resin plate (A) or the styrene-methyl methacrylate copolymer resin plate (C) itself may This is not preferable because it 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 styrene-methyl methacrylate copolymer resin plate (C) to melt and flow unnecessarily. .

[0037] Regarding the pressurizing conditions, the laminate was
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 styrene-methyl methacrylate copolymer resin plate (C) and the intermediate bonding layer (B) will be insufficient, and there will be a gap between the layers. This is not preferable because it not only causes bubbles to occur, but also significantly deteriorates the see-through 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.

[0039] 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 stacked by sequentially inserting them between a plurality of metal plated plates, etc., and these are inserted between a number of flat heating plates, so that the 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.

[0041]

[Function] According to the synthetic resin safety glass of the present invention, the polycarbonate resin plate (A) and the styrene-methyl methacrylate copolymer resin plate (C) are combined with non-yellowing diisocyanate, polyether diol, and a curing agent. Since they are bonded via the thermoplastic polyurethane intermediate bonding layer (B) made of a reaction product of Uniform adhesion and high adhesion strength can be obtained also in adhesion between the styrene-methyl methacrylate copolymer resin plate (C) and the other styrene-methyl methacrylate copolymer resin plate (C), so that 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.

[0042] Furthermore, in the method of the present invention, the polycarbonate resin plate (A) and the styrene-methyl methacrylate copolymer resin plate (C) are prepared from a reaction product of a non-yellowing diisocyanate, a polyether diol, and a curing agent. These laminates are stacked with a thermoplastic polyurethane intermediate bonding layer (B) interposed therebetween, and the laminate is heated and pressed under specific temperature and pressure conditions using a hot press. This makes it possible to manufacture manufactured safety glass very efficiently and reliably.

[0043]

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

Examples 1 to 6 and Comparative Examples 1 to 8 In these Examples and Comparative Examples, synthetic resin safety glasses shown in FIGS. 1 and 2 were investigated.

First, for each example and comparative example, the polycarbonate resin plate (A), the styrene-methyl methacrylate copolymer resin plate (C), and the 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. The dimensions of the laminated materials are 500mm x 1
000mm.

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, trade name Molsen PE193) B2 : Intermediate bonding layer for comparative example Thermoplastic polyurethane containing aromatic diisocyanate and polyester diol as main reaction components (abbreviated as polyester thermoplastic polyurethane) (manufactured by Nippon Miractran Co., Ltd., trade name Miractran E780) C1:MS Resin plate-■: Styrene-methyl methacrylate copolymer resin transparent plate (manufactured by Nippon Steel Chemical Co., Ltd., trade name Esterene, MS-200, styrene/methyl methacrylate ratio: 80/20) C2: MS resin plate-■ ; Styrene-methyl methacrylate copolymer resin transparent plate (manufactured by Nippon Steel Chemical Co., Ltd., product name: Estyrene, MS-300, styrene/methyl methacrylate ratio: 70/30) C3: MS resin plate - ■; Styrene-methyl Methacrylate copolymer resin transparent plate (manufactured by Nippon Steel Chemical Co., Ltd., trade name: Estyrene, MS-600, styrene/methyl methacrylate ratio: 40/60) F1: MMA resin transparent plate for comparative example (methyl methacrylate type) 100%) F2: PS resin transparent plate for comparative example (polystyrene type 1
00%) Next, these laminates were heated and pressed 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 6, 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.

[0048] 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 the intermediate bonding layer (B), the adhesive interface b interface = the adhesive interface between the intermediate bonding layer (B) and the styrene-methyl methacrylate copolymer resin transparent plate (C) ■Impact resistance: Weight 2 kg, striking tip Radius of curvature: When a steel weight with R = 3/8 inch is dropped perpendicularly from a height of 10 m onto the surface of the styrene-methyl methacrylate copolymer resin transparent plate (C) side of each synthetic resin safety glass sample. The presence or absence of layer peeling, the presence or absence of weight penetration, and the presence or absence of whitening were 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 6 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 (
At the adhesive interface (b interface) between B) and the styrene-methyl methacrylate copolymer resin transparent plate (C), the same adhesiveness as at the a interface is exhibited.

[0062] In the impact resistance test, there was no delamination, no weight penetration or whitening, 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 (F1) were laminated,
Immediately after manufacturing, no layer peeling is observed.
Adhesive strength was low and delamination occurred in impact resistance tests.

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.

Regarding Comparative Examples 4 and 5, initially the polycarbonate resin plate (A) and the styrene-methyl methacrylate copolymer resin plate (C) were combined with the intermediate bonding layer (B).
), layer delamination occurred, and bubbles were formed in the appearance, so it could not be subjected to a durability test.

[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 (F2
) Laminated with synthetic resin safety glass, although no delamination was observed immediately after manufacture, adhesive strength was low and delamination occurred in impact resistance tests.

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 comprises a polycarbonate resin plate (A) and a styrene-methyl methacrylate copolymer resin plate (C) made of non-yellowing diisocyanate and polyether diol. , and a thermoplastic polyurethane intermediate bonding layer (B) made of a reaction product of a curing agent, so only the adhesiveness between the polycarbonate resin plate (A) and the intermediate bonding layer (B) is In addition, it is possible to improve the adhesion between the intermediate bonding layer (B) and the other styrene-methyl methacrylate copolymer resin plate (C), thereby preventing the peeling phenomenon that occurs over time as in the conventional method. It does not cause devitrification or distortion of perspective images, has excellent impact resistance and durability, and has the effects of 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] Furthermore, in the method for producing safety glass made of synthetic resin according to the present invention, as described above, the polycarbonate resin plate (A) and the styrene-methyl methacrylate copolymer resin plate (C) are mixed with non-yellowing diisocyanate, stacked with a thermoplastic polyurethane intermediate bonding layer (B) made of a reaction product of polyether diol and a curing agent;
These laminates are heated to a temperature of 100 to 15% by hot pressing.
According to the method of the present invention, synthetic resin safety glass having excellent quality as described above can be produced very efficiently and under pressure at 0°C and a pressure of 5 to 50 kg/cm2. This has the effect that it can be manufactured reliably.

[Brief explanation of the drawing]

FIG. 1 is an enlarged exploded sectional view of essential parts of a synthetic resin safety glass according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the synthetic resin safety glass according to the present invention.

[Figure 3] Current state of synthetic resin safety glass according to the present invention
FIG. 3 is an enlarged cross-sectional view of main parts showing two specific examples.

FIG. 4 is an enlarged sectional view of a main part showing a modification of the 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 Styrene-methyl methacrylate copolymer resin transparent plate

Claims (3)

[Claims] Claim 1: The polycarbonate resin plate (A) and the styrene-methyl methacrylate copolymer resin plate (C) are mixed with non-yellowing diisocyanate, polyether diol,
and a synthetic resin safety glass bonded via a thermoplastic polyurethane intermediate bonding layer (B) made of a reaction product of a curing agent. 2. On the other side of the styrene-methyl methacrylate copolymer resin plate (C), a styrene-methyl methacrylate copolymer resin plate (C) made of the same material or an acrylic resin plate (D) made of a different material is further bonded. The synthetic resin safety glass according to claim 1, wherein the synthetic resin safety glass is 3. The polycarbonate resin plate (A) and the styrene-methyl methacrylate copolymer resin plate (C) are mixed with non-yellowing diisocyanate, polyether diol,
and a thermoplastic polyurethane intermediate bonding layer (B) consisting of a reaction product of a curing agent and a curing agent, and the laminate is heated with a hot press at a temperature of 100 to 150°C and a pressure of 5 to 50 kg/cm2. A method for manufacturing safety glass made of synthetic resin, which is characterized by pressurization.