JPS63136019A - Frame of spectacles - Google Patents

Abstract

PURPOSE:To produce a spectacles frame having light weight and resistance to breakage by using nylon or polyamide resin incorporated with a filler contg. a specified amt. of carbon fiber and potassium titanate. CONSTITUTION:10-100pts.wt. filler contg. >=5pts.wt. carbon fiber and >=5pts.wt. potassium titanate is mixed with 100pts.wt. at least one kid of polyamide resin selected from nylon 11, 12, or 612. Suitable carbon fiber is several types of carbon fiber such as flame resistant, carbonaceous, or graphitic carbon fiber, etc. obtd. by calcining several raw materials generally such as cellulose fiber, polyacrylonitrile fiber, lignin fiber, special kind of petroleum pitch, etc., but polyacrylonitrile carbon fiber is most preferred. By this method, fine spectacles frame having light weight and resistance to breakage, superior formability and optional design is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lightweight and unbreakable plastic eyepiece frame.

(Prior art and problems) Originally, eyeglass frames were made of metal, and celluloid and acetate plastics were the mainstream, but in recent years, resin glasses that are durable and unbreakable have become popular in terms of fashionability and functionality. The need for frames is increasing.

Eyeglass frames are generally divided into two types: large frames, which have a large cross-sectional area, and narrow frames. Although there is no clear standard for distinguishing between the two, generally speaking, as the frame becomes thinner in terms of design or function, the required rigidity of the material increases.

By the way, the fatal flaw in the material of eyeglass frames is;
It's late. The tJ resin selected as the OJ:zo frame is
The frame must not crack when bent by more than 90° in any shape. For these reasons, the mechanical properties required of the material used for eyeglass frames are that it is hard and does not break when bent, that is, it has a high flexural modulus and a high bending elongation at break.

On the other hand, from the perspective of thermoplastic resins, high bending (IP) properties and high bending elongation at break are generally contradictory properties.
In order to solve the V point, we conducted extensive research on Qω1 and found that it could be solved by mixing multiple fillers with polyamide resin with high viscosity f1.Based on this knowledge, we developed an excellent thin frame that is lightweight and hard to break. This led to the invention of a plastic eyeglass frame.

(Means for solving the problem) That is, the present invention provides
One or more selected polyamide resins 100
An eyeglass frame made of a resin composition containing at least 5 parts by weight of carbon fiber, at least 4 parts by weight of potassium titanate, and 10 to 100 parts by weight of a filler containing L, relative to the mold opening. be.

As the polyamide resin used in the present invention, nylon 11
, nylon 12, or nylon 612.

The carbon fibers used in the present invention generally include various types of carbon such as flame-resistant, carbonaceous, and graphitic carbon fibers obtained by firing cellulose fibers, polyacrylonitrile fibers, lignin fibers, petroleum-based special pitches, etc. as raw materials. Although 1M chicks can be used,
In particular, it is preferable to use polyacrylonitrile carbon fiber.

Potassium titanate used in the present invention is a single crystal whisker of potassium titanate, and may be a single crystal whisker of potassium titanate, for example, potassium 4-butanate fiber, potassium 8-titanate fiber, or a mixture thereof. It is also possible to use those commercially available under the trade name ``RAISUMO (T15M0) J'' (manufactured by Ohita Kagaku) as they are.These potassium titanates may be used without surface treatment, but To improve the interfacial adhesive strength with polyamide resin, surface treatment agents such as epoxysilane, aminosilane, etc.
It is also possible to use a surface treated material with a silane coupling agent such as acrylic silane or a titanate coupling agent.

The formulation rIi of the resin composition of the present invention is polyamide resin 1
It is preferable that 10 to 100 suspended portions of the filler containing carbon fiber and potassium titanate be surrounded with respect to 00 m parts by weight. If the amount is less than 10 parts by weight, the physical properties of the polyamide resin will not be improved, and if it is more than 100 parts by weight, the physical properties will deteriorate.

Combination h1 of carbon fiber and potassium titanate
It is necessary that 5 or more individual parts of each of M are contained, and if the content M is less than this, the excellent effects of the present invention cannot be obtained.

The composition of the present invention may further contain other compounds, such as antioxidants, flame retardants, etc., to the extent that they do not reduce the effects of the present invention.
Antistatic agents, lubricants, heat stabilizers, etc. may be added as appropriate.

(Effects of the Invention) The eyeglass frame of the present invention has a wide eave, is hard to break, has excellent moldability, and can be molded into a narrow frame of any design. Furthermore, by incorporating these inorganic fillers, the paintability was significantly improved compared to the nylon resin alone.

(Examples) The present invention will be described below based on Examples, but the present invention is not limited to these Examples.

Examples 1 to 4, Comparative Example 1 Using an extruder, carbon fiber and potassium titanate were added to Nycon 12, in which the relative viscosity of the 0.5% m-cresol solution was 1.8, at the blending ratio shown in Table 1. Knead with
The flexural modulus of the dest bead formed by injection molding of the pellet was measured.

Next, the eyeglass frame shown in the figure was manufactured by injection molding using these pellets. The thinnest A-A' in this frame
Cut out the part and make point B (cross-sectional area 0.042c11f)
A 90° bending test was carried out using the material as a fulcrum, and the presence or absence of any fracture caused by one bending was examined.

The results are shown in Table 1.

Comparative Examples 2 to 4 The bending elastic modulus was 70,000, which corresponds to Example 2! I/c
The resin composition of Ii was mixed with various inorganic fillers alone and
A combination of 1 and 12 was manufactured by IJ, and an eyeglass frame was produced by injection molding, and a similar bending test was conducted. Formability and 90
The occurrence rate of scratches in the bending test (once) was as shown in Table 2.

[Brief explanation of the drawing]

The figure is a diagram showing rJ of an example of the present invention and a comparative example, and a spectacle frame used in the experiment.

Claims (1)

[Claims] One filler containing at least 5 parts by weight of carbon fiber and at least 5 parts by weight of potassium titanate is added to 100 parts by weight of one or more polyamide resins selected from nylon 11, 12, or 612.
An eyeglass frame made of a resin composition containing 0 to 100 parts by weight.