JP2006047802A - Frame for resin spectacles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the feeling of discomfort during mounting and enlarge the degree of design freedom, by providing a spectacle frame that is unlikely to generate deformation of a temple due to high water absorption by amide coupling concerning the frame of the spectacle frame. <P>SOLUTION: The spectacle frame uses a semi-aromatic amorphous copolymerized polyamide resin consisting of a chain composed of aliphatics, cyclic aliphatics, and aromatics. The spectacle frame lowers the water absorption and prevents lowering of strength due to water absorption, when the aromatic is introduced in a main chain of a polymer by using the semi-aromatic amorphous copolymerized polyamide resin containing the aromatics, such as terephthalic acid and isophthalic acid using no aliphatic polyamide resin. Since it is a amorphous resin, the spectacle frame improving transparency can be provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a spectacle frame using a resin.

  Glasses are composed of many parts. Although it depends on the type of glasses, in general, the main components of glasses are two lenses, a rim for fixing the lens, a bridge connecting the left and right lenses, the purpose of stabilizing the glasses and the edge of the glasses (front frame) Pads that soften the contact when hitting the nose, pad feet that connect the pad and the front frame, temples to stabilize the glasses on the face, chi that connects the temple and the front frame, temple end part (the part that hangs on the ear) There are modern hinges that reduce the impact when hitting the ears, and hinges that make up the hinge mechanism of the temple. In order to connect the respective parts, various methods such as screwing, brazing, adhesive fastening, fitting, caulking, and tacking are adopted depending on the parts and types of glasses.

  When using glasses, the ears and nose are loaded, which can cause considerable discomfort when using the glasses. In order to reduce the discomfort associated with the use of glasses, it is necessary for each user to select a spectacle frame having a shape suitable for the face shape and to wear spectacles suitable for the individuality. Therefore, even with the same frame type, frames of various shapes and materials are designed and manufactured in various dimensions.

  In order to improve the discomfort associated with wearing glasses, it is necessary to reduce not only the shape of the frame but also the load itself. Therefore, weight reduction has been achieved by using parts made of a light material or parts made of a material excellent in strength and devised in shape and reduced in size.

  The main purpose of eyeglasses is to correct vision, but at present, eyeglasses play an important role as a fashion prop. However, since the feeling of use of the glasses is greatly influenced by the weight of the glasses, it is preferable that the glasses frame is still light.

  The members constituting a conventional spectacle frame are classified into a metal frame, a plastic frame, and the like depending on the material used. Glass frame (temple) mainly composed of metal parts Metal frame, spectacle frame (temple) mainly composed of plastic parts Plastic frame, spectacle frame (temple) main parts metal and plastic The combination frame which used properly is mentioned.

  Since metal is stronger than plastic, it is often used for spectacle frame parts that are required to be thinner and thinner. Plastic is a lighter material compared to metal, but its strength is small, so there is no problem when it is used in combination with metal for decorative purposes. Therefore, it becomes a large and thick part. On the other hand, plastics are characterized by being easy to mold, low cost, and soft to the touch.

  Recently, cell frames that feature thick edges have also become thinner and two-point types as the strength of plastic increases. As the material of the cell frame, acetate, polyphenylsulfone, polyamide resin or the like is used. In particular, polyamide resin is rich in elasticity, and has high ability to absorb impacts, so it is also used as a sports eyeglass material.

  The polyamide resin is a crystalline resin having an amide bond in the main chain of the polymer. Generally called nylon. There are many types such as polyamide 6, polyamide 66, polyamide 612, and the like having further improved properties. These are crystalline resins having amide bonds on chain hydrocarbons in which carbon atom bonds are bonded in a row, and are also called aliphatic polyamide resins.

  Since the aliphatic polyamide resin is a crystalline resin, it has good fluidity and is easy to mold. A tough engineering plastic with excellent impact resistance, high surface hardness and low wear coefficient. Self-lubricating and strong against oil. Therefore, it is widely used for parts such as automobile connectors, belts, and gears.

  Aliphatic polyamide resins have excellent properties as described above, but also have weak points such as lack of transparency due to crystallinity and changes in physical properties due to water absorption resulting from amide bonds. Polyamide 610 and polyamide 612 are resins with improved water absorption, which is a weak point of nylon.

  Since the invention of the polyamide resin, it has also been applied to spectacle frames. However, the opaque resin has a large design limit and has not been widely used. Still, it is used in some sports glasses frames and sunglasses where strength is important.

  On the other hand, if an aromatic polyamide resin containing an aromatic substance such as terephthalic acid or isophthalic acid is used instead of an aliphatic polyamide resin, and the aromatic is introduced into the main chain of the polymer, the water absorption is reduced, and the strength due to water absorption is reduced. Decline can be prevented. Moreover, since it becomes an amorphous resin, transparency improves.

  Conventionally, many improved polyamide resins have been filed. For example, “polyamide resin composition” (Patent Document 1) aims to provide a polyamide-polyolefin resin composition having high mechanical strength, low water absorption, and particularly excellent appearance and impact resistance. A polyamide resin composition comprising a terpolymer polyamide resin (A), a modified polyolefin (B), and an inorganic filler (C) obtained from a hexamethylene adipamide component, a hexamethylene isophthalamide component, and a caproamide component. , The amino terminal group amount of the tricopolymerized polyamide resin (A), and the ratio X (—NH 2 / acid modified amount) between the amount of carbo terminal group and the amount of acid modification of the modified polyolefin (B), Y (—COOH / A polyamide resin composition is disclosed in which the acid modification amount is 1.25 ≦ X ≦ 10.0, 3.25 ≦ Y ≦ 22.0, respectively.

In addition, “Polyamide resin composition and method for producing the same” (Patent Document 2) is extremely excellent from low temperature to high temperature while maintaining the excellent strength, rigidity, heat resistance, chemical resistance and moldability of polyamide resin. (A) Polyamide resin, (B) Inorganic reinforcing material, (C) Thermoplastic resin different from the polyamide resin and (D) High fatty acid metal A polyamide-based resin composition containing a salt or an ester, wherein the composition has an Izod impact strength of 200 J / m or more, is disclosed.
JP 2004-099845 A JP 2003-238798 A

  The eyeglass frames are lighter and have a new design to improve the comfort of the wearer and to respond to the diversification of orientation. The burden of wearing glasses has been considerably reduced compared to before, and many designs have been devised, such as ingenuity in materials, shapes, and structures. However, the discomfort associated with the use of eyeglasses has not been eliminated, and the design is limited by the characteristics of the frame material.

  There are always problems with eyeglass frames such as discomfort due to wearing and design limitations, and we will continue to improve and improve them by reducing the weight and devising designs to solve various problems. There is a need.

  For example, a resin frame using a resin is lightweight and has a design that makes use of transparency and coloring. In these respects, it is superior to a metal frame, but is inferior in terms of shape-maintaining characteristics due to water absorption resulting from amide bonds.

  The present invention provides a frame for a spectacle frame using a polyamide resin, which is less likely to cause deformation of a temple due to high water absorption due to an amide bond, thereby reducing discomfort during wearing and increasing design flexibility. For the purpose.

  In order to solve the above-mentioned problem, the present invention described in claim 1 of the present invention is a semi-aromatic non-crystalline copolymer polyamide resin comprising a chain composed of aliphatic, cycloaliphatic and aromatic. It is the frame for spectacles using.

  By using a semi-aromatic non-crystalline copolymerized polyamide resin containing aromatics such as terephthalic acid and isophthalic acid instead of an aliphatic polyamide resin, if the aromatic is introduced into the main chain of the polymer, the water absorption is reduced. It is possible to prevent a decrease in strength due to water absorption. Further, since it is an amorphous resin, a frame for spectacles with improved transparency can be provided.

  Since the semi-aromatic non-crystalline copolymer polyamide resin is amorphous and transparent, there are few restrictions on the design of the spectacle frame. In addition, because of its low water absorption, it is easy to re-dry before spectacle frame molding. Further, since it has high fluidity, it is possible to lower the eyeglass frame molding processing temperature, and the resin is less likely to be thermally deteriorated, and the eyeglass frame molding machine and the mold are hardly damaged.

  In addition, since the semi-aromatic non-crystalline copolymer polyamide resin used in the present invention has a small minimum bending radius, the spectacle frame is not easily broken and the bending recovery is good. Furthermore, the chemical resistance is high, and there is an effect that the chemicals such as cosmetics are hardly deteriorated and are not easily broken.

  A semi-aromatic non-crystalline copolymer polyamide resin is used in the spectacle frame of the present invention. For example, Rilsan (registered trademark) can be used.

  The characteristics of Rilsan (registered trademark), which is a semi-aromatic non-crystalline copolymerized polyamide resin, are listed below. Table 1 is a table showing physical characteristics, optical characteristics, mechanical characteristics, chemical characteristics, and thermal characteristics of MS1100 and MS1700 of Rilsan (registered trademark).

The effects on each characteristic are as follows.
(About physical properties)
-Among the physical properties, when the glass transition temperature is low, it is suitable for injection molding at the time of molding, and when the glass transition temperature is high, the heat-resistant effect is high, so that the heat-resistant use temperature is high and the stress crack resistance is excellent.
-Of the physical properties, low density will save material costs.
-Among physical properties, when the equilibrium moisture absorption is low, the dimensions and physical properties of the product are stabilized. Furthermore, deterioration during molding is suppressed, and the product can be easily dried again.

(Optical characteristics)
Of the optical characteristics, the light transmittance is the light transmittance with respect to the substance, and the higher the numerical value, the higher the transparency.

(Mechanical characteristics)
-Among the mechanical properties, the higher the flexural modulus, the thinner the frame, so the weight can be reduced.
-Among mechanical properties, the greater the tensile yield stress, the harder it becomes to permanently deform.
-Of the mechanical properties, the larger the tensile elongation at break, the harder the permanent deformation.
-Of the mechanical properties, the greater the Shore D hardness, the less likely to be damaged.

(Chemical properties)
-Among chemical properties, stress crack resistance to each chemical is required, and MS1100 does not cause cracking to alcohol, ketone, ether, n-decane, xylene, and has resistance to these chemicals. I understand that. Further, it can be seen that MS1700 also has resistance to these chemicals without cracking with respect to ketone, ether, n-decane, and xylene.

  In the stress crack resistance test, the thickness of the test piece is 2 mm, the length is 78 mm, and the test piece is bent and attached so that the distance between the fulcrums is 60 mm. The test piece is 4 mm wide and 0.5 mm deep. The notch was inserted and immersed in the test solution at 30 degrees.

As a result, it turned out that it has tolerance with respect to the following chemical | drug | medicine.
(reagent)
90% ethanol, acetone, xylene, gas oil, 100% isopropanol, methyl ethyl ketone, ether, methylene chloride, caustic soda, 10% hydrochloric acid, 10% sulfuric acid, trichlorethylene, pure water (cosmetics)
Tanning analgesic ointment, emulsion, foundation, diisopropyl adipic acid, silicone, hairdressing agent, sunflower oil, di-2ethylhexyl adipic acid, milanal 2MHT, octamethyl-cyclotetrasiloxane, pentamethylheptane, diethylphthalic acid

(About thermal characteristics)
-Of the thermal characteristics, the higher the heat distortion temperature, the higher the heat resistance effect, so that heat resistance deformation is less likely to occur.

The main characteristics of Rilsan (registered trademark) are summarized as follows.
・ Strong tensile yield strength (Test method: conforms to ISO527, tensile speed 50mm / min, chuck distance 50mm, tensile strength about 40kgf)
・ Since the minimum bending radius is small, it is hard to break and has a good restoring force against bending. Even when bent more strongly, it does not easily cause permanent deformation.
・ Since it has good chemical resistance, it does not easily deteriorate against chemicals such as cosmetics.
・ Excellent impact resistance and hard to break.
-Low water absorption makes it easy to re-dry before molding, has no potential defects, and improves durability. Moreover, there are few dimensional changes and resin physical property changes by moisture absorption.
-Due to the high fluidity, the molding process temperature can be lowered, the resin is less susceptible to thermal degradation, and the molding machine and mold are less likely to be damaged.
・ High transparency.

  Next, the properties of Rilsan (registered trademark) having the above physical properties and other transparent resins are actually compared. Here, the physical properties of Polysulfone were compared with Polycarbonate, which is one of the plastics produced using Rilsan (registered trademark), bisphenol A and carbonyl chloride (or diphenyl carbonate) as raw materials. Table 2 shows the result of comparison. As can be seen from the table, polycarbonate is inexpensive and rich in moldability, but has the disadvantage of being easily hydrolyzed. Polysulfone does not hydrolyze, but has the disadvantage of being vulnerable to chemicals and impact. On the other hand, it can be seen that Rilsan (registered trademark) has excellent properties that it is easy to mold, does not hydrolyze, and is resistant to chemicals and impact.

  Therefore, by making a frame for spectacles using the semi-aromatic non-crystalline copolymerized polyamide resin, it is possible to obtain a transparent resin frame that is difficult to break.

  Table 3 shows molding guides for actually molding MS1100 and MS1700 of Rilsan (registered trademark). Here, it is a table | surface which shows the guide about injection molding and extrusion molding.

  Since the semi-aromatic non-crystalline copolymer polyamide resin is amorphous and transparent, there are few restrictions on the design of the spectacle frame. In addition, because of its low water absorption, it is easy to re-dry before spectacle frame molding. Further, since it has high fluidity, it is possible to lower the eyeglass frame molding processing temperature, and the resin is less likely to be thermally deteriorated, and the eyeglass frame molding machine and the mold are hardly damaged.

In addition, since the semi-aromatic non-crystalline copolymer polyamide resin used in the present invention has a small minimum bending radius, the spectacle frame is not easily broken and the bending recovery is good. It is highly resistant to chemicals and has the effect of being difficult to deteriorate and cracking against chemicals such as cosmetics.

Claims (1)

A frame for spectacles using a semi-aromatic non-crystalline copolymer polyamide resin composed of a chain composed of aliphatic, cycloaliphatic and aromatic.