JPS59218843A - Laminate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminate that is strong and has excellent fracture resistance, which is formed by laminating a single crystal S7A and an aromatic polycarbonate molded product.

As is well known, single crystal sapphire has high hardness, good optical transparency, electrical properties, and high heat resistance.

It is an inorganic industrial material with excellent thermal conductivity and better mechanical properties than glass, making it a useful material used in applications that require extremely severe performance.

However, although its fracture resistance is greatly improved compared to glass, it is still not sufficient to withstand high impact.

On the other hand, aromatic polycarbonate is a resin that is strong and has excellent electrical properties and impact resistance, and is widely used as a so-called "engineering plastic." However, compared to inorganic materials such as iron and glass, their strength and rigidity are inferior, so
Its use in applications requiring these properties is restricted.

Laminated bodies with glass have been considered for this purpose, but they have the problem of being insufficient to meet the demands for higher fracture resistance.

As a result of various studies aimed at developing a material with excellent toughness and fracture resistance, the inventor of the present invention discovered that a laminate made by laminating single-crystal S7I7 and an aromatic polycarbonate molded product had excellent properties. The present invention was achieved by discovering that the present invention has the following properties.

That is, the present invention is a laminate formed by laminating single crystal sapphire and an aromatic polycarbonate molded product.

In addition, the destruction resistance as used in the present invention means that an object that collides with one side of the stacked carcass or is pressed against it breaks the stacked body.
Q refers to the property of preventing the fragments of a destroyed laminate from scattering to the opposite side even if the object moves quickly to the opposite side or the object does not reach the opposite side.

The single crystal sapphire used in the present invention is α-Al, O,
It is a single crystal. This single-crystal sapphire is produced by a conventional direct melting method such as the Czochralski method, the Bernoulli method, or the Bridgman method, that is, by melting a raw material and cooling and solidifying the molten liquid.

The aromatic polycarbonate used in the production of the aromatic polycarbonate molded article used in the present invention has the following formula (%), where X is hydrogen and an alkyl group having 1 to 6 carbon atoms.

It is selected from the group consisting of an alkoxy group and an I\rogen atom, n is 20 to 400, and m and m' are each an integer of 1 to 4. Y is an alkylidene group having 1 to 6 carbon atoms, a cycloalkylidene group, s, So.

SOI or O).

This aromatic polycarbonate is generally produced from an aromatic dihydroxy compound and a carbonate precursor by a melt method or a solution method. Specific examples of aromatic dihydroxy compounds include 2,2-bis(4-hydroxyphenyl)
Prono(bisphenol A), bis(4-hydroxydiphenyl)methane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-
Hydroxy-3,5-dimethylphenyl)propane, 1
, 1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(4-hydroxy-3,5-diglomphenyl)(n).

2.2-bis(4-hydroxy-3-zuromphenyl)
Propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 2,2-bis(4-hydroxy-3-coolphenyl)propane, bis(4-hydroxyphenyl)sulfone, Examples of carbonate precursors include bis(4-hydroxyphenyl) sulfoxide, bis(4-hydroxyphenyl) sulfide, and bis(4-hydroxyphenyl) ether.Also, carbonate precursors include phosgene, diphenyl carbonate, and aromatic dihydroxy compounds. Specific examples include chloroformate and the like.

When producing an aromatic polycarbonate, one or more of the aromatic dihydroxy compound and carbonate precursor may be used, and if necessary, a molecular weight regulator, a branching agent for improving moldability, or A catalyst may be used to promote the reaction. Further, the obtained aromatic polycarbonate may be used alone or in a mixture of two or more for molding. Furthermore, aromatic polycarbonate) K may be used with various additives, such as stabilizers, ultraviolet absorbers, antioxidants, antistatic agents, and flame retardants, as required.

There is no problem even if the required amount of deafening agents, dyes and pigments, powder/grain 9ML fibers, flake-like reinforcing agents, and fillers are included.
Furthermore, traps, other polymers, and oligomers may be mixed in order to enhance the characteristics of the aromatic polycarbonate or compensate for its shortcomings.

As aromatic polycarbonate, the viscosity average molecular weight is 1
0,000 to i o o, o o o, especially 15.0
00 to 70,000 is preferably used.

The aromatic polycarbonate molded article used in the present invention can be produced by molding the aromatic polycarbonate described above using various known molding methods, such as extrusion molding and injection molding.

It is molded by compression molding, powder molding, slow molding, vacuum molding, etc. These molded products may not only be filled uniformly, but also have many micro-voids dispersed, such as foam, or partitioned by many ribs, such as twin walls. It may also have relatively large voids.

Although there are no particular restrictions on the shape of the molded product, it is generally desirable that it be in a shape that can be easily laminated with single-crystal sapphire, such as a film or sheet.

The laminate usually has a one-to-one bonded structure of single crystal sapphire and aromatic polycarbonate molded product. The most common bonding method is full or partial bonding with adhesive. For special applications, for example, an *i structure may be used in which only the peripheral parts are joined through a spacer inserted in the peripheral part or by creating a framework structure, leaving a gap in the center. . As a joining method in such a special case, in addition to using an adhesive, mechanical joining methods such as using bolts or fitting can also be used. The adhesive used can be appropriately selected from known adhesives depending on the application. For example, rubber type, thermoplastic synthetic resin type, epoxy resin type, urethane resin type, cyanoacrylic type, IfA pressure type, hot melt type, ultraviolet curing layer,
Examples include anaerobic curing adhesives.

As mentioned above, the structure of the laminate can take various forms depending on the application, and more specific laminate structures include, for example, sapphire/sapphire/polycarbonate, and sapphire/polycarbonate/sapphire. , sapphire/polycarbonate/polycarbonate, polycarbonate/
Examples include sapphire/polycarbonate. Furthermore, glass and synthetic resins other than aromatic polycarbonate may be combined depending on the WK. These laminates may further be subjected to surface treatment before or after lamination, depending on their intended use. Examples of surface treatments include:
plating.

Vapor deposition or sputtering of metals (or compounds).

Examples include coatings to improve surface hardness, coatings to improve ultraviolet resistance, anti-fog and drip-proof finishing, and anti-glare finishing.

The laminate of the present invention exhibits extremely high fracture resistance against collision with hard objects and crushing. In other words, the strength of single crystal sapphire and the toughness and impact resistance of aromatic polycarbonate not only complement each other, but also have an amazing interaction effect, absorbing external forces applied by hard objects. Furthermore, even if the sapphire is broken, the fragments are completely prevented from scattering by the polycarbonate. This resistance to breakage makes it ideal as a protective material, making it safe for a wide range of applications. This will make a major contribution.

The present invention will be described in detail below with reference to Examples, but the present invention is not necessarily limited thereto.

Example 1 and Comparative Example 1 Two sheets of fire-crystalline alumina (70 am x 20 sm x 2.5
SOA / T
25am

When this laminate was held without being fixed with a span interval of 5()llIll and a 200Il steel ball was allowed to fall naturally from a height of 30cm, the single crystal alumina at the collision surface with the steel ball (upper '1ffl) was Although it was damaged, the aromatic polycarbonate sheet and the single crystal alumina on the bottom surface were not damaged.

For comparison, glass (70mm x 2mm) was used instead of single crystal alumina.
A laminate was obtained in the same manner as above except that 0#1IIX2.5/T) was used. When this laminate was subjected to the above-mentioned falling ball test, both sides of the glass were broken and glass fragments were scattered.

Example 2 and Comparative Example 2 Single crystal alumina (70J!llX20amx2.5gm
/T) and aromatic polycarbonate sheet (Teijin Kasei ■:
Panlight PCIII, 75 chu X 25 #1 IX 2.5
ta/T) were laminated together using an epoxy adhesive (■ Three Pond 1500, manufactured by Three Pond) to form a laminate.

This laminate was placed without fixing it on a table with a hole of 15mm diameter, and a weight of 200mm was placed in the center of the hole, and a tip was placed with a tip of 1a and an IR apex angle of 30°.
A destructive test was carried out by allowing a carbon steel cone to fall naturally, and when it was dropped from a height of 60 cIrL, the single crystal alumina on the surface did not break.

For comparison, glass (7Q#1) was used instead of single crystal alumina.
fiX 20 #1lt

Example 3 and Comparative Example 3 The same procedure as in Example 2 and Comparative Example 2 was carried out using a rubber adhesive (ThreeBond 1521) instead of the epoxy adhesive. In the case of single crystal alumina The glass did not break at a height of 75c7+L, but the glass did not break at a height of 171m.

Example 4 and Comparative Example 4 The same single-crystal alumina as in Example 2 was used to create a framework structure using an aromatic polycarbonate sheet (70 x 20 x 5 pieces/T) and adhesive. , indifference 2
When the same test as in Example 2 was carried out by allowing a 00F carbon@ pyramid to fall naturally, the single crystal alumina was destroyed by the free fall from a height of 49 CIL, but the pyramid was not penetrated.

For comparison, when the above test was carried out using only single crystal alumina, it was destroyed by falling naturally from a height of 2'7 cm, and the pyramid was penetrated.

Example 5 and Comparative Example 5 Single crystal alumina (70 mX 20 gsX 2.5 m
/Ton and aromatic polycarbonate sheet (Panlite P
CIII, 70x201!1lx3x/T),
Epoxy adhesive (manufactured by Cemedine ■: Cemedine 150)
0), urethane adhesive (contamination rumor: KU610/K
U620), cyanoacrylate adhesive (Toagosei Kagaku Kogyo ■NiaonAlf! $201) or ultraviolet curable adhesive (Photopond 500°) to overlap so that the overlapping area is 4ad and leave overnight at room temperature. It was left to stand to form a laminate.

These laminates were tested using a tensile tester (Toyo Bold Twin Co., Ltd. Tensilon UTM-500) with a chuck spacing of 601.
．． When the tensile shear load was measured at a crosshead speed of 1otutr/min, it was 225? , 245 to 9.
165Ky and 175K? All cutting was through the adhesive layer, and no fragments were scattered.

For comparison, when glass was bent instead of single-crystal alumina, the tensile shear load was 100 to 110K9, and in both cases the glass was broken and fragments were scattered.

Patent applicant: Teijin Kasei Ltd. Kyocera Corporation

Claims (1)

[Claims] A laminate made by laminating single crystal sapphire and aromatic polycarbonate molded products.