JPS625841A - Manufacture of spectacles-frame with pattern - Google Patents

Abstract

PURPOSE:To provide the spectacles-frame which is free from the deformation due to heat and moisture and is not attached by a sweat, make ups and hair dressing agents in use by a method in which after one part or total surface of the spectacles frame molded with thermoplastic polymethyl pentane resin has been caused to be in contact with the dyes having sublimation property, the spectacles frame is left as it is, under the high temperature condition of 140-170 deg.C for five minutes to one hour. CONSTITUTION:In the first process, the pellet of polymethyl pentene resin is molten at resin temperature of 300 deg.C, using the injection molding machine for thermoplastic resin, and the resin is injection molded in the mold for the spectacles frame. Thus, the spectacles frame made of polymethyl pentene resin is obtained. In the second process, the transfer paper for three colored turtle back pentene preliminarily screen-printed with the dye ink having sublimation property, is wound on the spectacles frame such that the ink with sublimation property is caused to be as closely as possible in contact with the spectacles frame. Then, after said frame has been left in the oven of 150 deg.C for 30min, it is taken out and cooled to room temperature and then the transfer paper is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a thermoplastic synthetic resin eyeglass frame having an elegant pattern.

(Prior Art) Conventionally, fiber-based resins such as celluloid and acetyloid have been used as materials for high-grade synthetic resin eyeglass frames.They are usually supplied in the form of sheets with patterns, and these sheets are cut. They were made into eyeglass frames through extremely labor-intensive processes such as cutting, bending, and cutting.

Eyeglass frames made by this method can have, for example, a tortoiseshell pattern,
It has elegant patterns that are close to nature, such as amber patterns, wood grain patterns, marble patterns, and leather patterns, and its commercial value is extremely high, but the manufacturing process to create the patterns is difficult. There were disadvantages in terms of cost, such as being too stiff and the price of the sheet being very high9. Moreover, cellulose resin has the disadvantage of deforming and deteriorating due to heat and moisture, but it is inexpensive, resistant to heat and moisture, and is not affected by hair conditioners, sweat, and cosmetics. The appearance of eyeglass frames with patterned patterns made of resin has been eagerly awaited.

(Problems to be Solved by the Invention) Therefore, the present invention aims to reduce the weight of an eyeglass frame, and provides an eyeglass frame that does not deform due to heat or moisture during use, and is not attacked by sweat, cosmetics, or hair styling products. (Means for solving the problem) The present invention is a first method of molding eyeglass frames using thermoplastic polymethylpentene resin using an injection molding machine for thermoplastic resin. a second step of contacting part or all of the surface of the molded eyeglass frame with a sublimable dye and then leaving it under a high temperature condition of 140°C to 170°C for 5 minutes to 1 hour; This is a method for producing an eyeglass frame having a pattern, characterized in that the eyeglass frame is obtained through a third step of painting part or all of the frame with paint.

To explain the present invention in more detail, polymethylpentene resin is a transparent thermoplastic resin having the following structural formula.

CH.

0H(CHI)2 (weight average molecular weight: 400,000 to 1,000,000) Since this polymethylpentene resin is thermoplastic, it can be easily hot-melt molded using an injection molding machine for thermoplastic resins. In this respect, thermosetting resins such as epoxy resin (optyl), polyester resin, urethane resin, silicon m
This is an advantage that is fundamentally different from U, etc.

- Thermoplastic resins have the advantage of being easily molded by hot melt molding, but on the other hand, they also soften, melt, and deform when heated, and usually, various types of resins are produced at temperatures above the heat deformation temperature of the resin. No processing takes place. However, this polymethylpentene resin has a heat distortion temperature of 85°C to 100°C (ASTM
Despite the low D648), the fact that no deformation that becomes a practical problem occurs even when left at high temperatures of 140°C or higher is due to the fact that other thermoplastic resins, such as polymethyl methacrylate resin and The properties are completely different from those of silica resin, transparent nylon resin, etc. This is the reason why polymethylpentene resin was used as the material for the eyeglass frame of the present invention.

The injection molding machine for thermoplastic resin used in the present invention may be one commonly used.

The methods of bringing the sublimable dye into contact with the surface of the eyeglass frame in the second step include: Direct application of sublimable dye powder onto the surface of the eyeglass frame; Method of applying or spraying in the form of ink, solution, or paint; Paper, Synthetic There is a method using the so-called "transfer paper method" in which sublimation dye ink is coated or printed on paper, metal foil, etc., and the paper, synthetic paper, metal foil, etc. is wrapped around the eyeglass frame. In the second step, after bringing the sublimable dye into contact with part or all of the surface of the eyeglass frame,
Under high temperature conditions of 70°C for 5 minutes to 1 hour, preferably 2 hours.
It is left to stand for 0 to 40 minutes, and by this step, the sublimation ink is diffused into the interior of the eyeglass frame, giving the υ pattern a deep three-dimensional effect. This is a pattern that cannot be created by simple methods such as painting or dyeing.

The leaving temperature in the second step is between 140°C and 170°C; if it is too low, the dye sublimes poorly and is not practical. Also, 1
At temperatures above 70° C., deformation of the eyeglass frame becomes a problem. Also, the leaving time is 5 minutes to 1 hour, preferably 20 minutes to 40 minutes, but if the leaving time is too short, the pattern will not be sufficiently formed. The paint used in the third step can be any paint as long as it adheres to the polymethylpentene resin eyeglass frame and has practical durability as a coating film. . Examples include acrylic paints, polyurethane paints, epoxy paints, polyester paints, aminoalkyd paints, melamine paints, and the like. This paint may be applied by any commonly used method, but any method such as spray painting, brush painting, dipping, electrostatic airless painting, etc. can be used.

In the third step, part or all of the surface of the eyeglass frame obtained in the second step was coated with paint to prevent the surface of the eyeglass frame from being easily scratched), prevent the pattern from fading, It is indispensable for the purpose of increasing the gloss of the surface or creating more complex patterns (by adding colorants to the paint).

Further, the present invention will be explained in detail by examples, but the present invention is not limited to these examples.

(Example 1) In the first step, a polymethylpentene resin pellet was used to mold the resin at a temperature of 80°C using an injection molding machine for thermoplastic resin.
A polymethylbentene resin eyeglass frame was obtained by melting it at 0° C. and injection molding it into a mold for an eyeglass frame. The paris and bartending lines of this eyeglass frame were removed.

In the second step, the 8-color tortoiseshell pattern transfer paper, which has been screen-printed in advance with sublimable dye ink, is wrapped around the eyeglass frame so that the sublimable ink and the eyeglass frame come into contact as closely as possible. The sample was taken out after being left in an open air at 150° C. for 30 minutes, and after cooling at room temperature, the transfer paper was removed.

In the third step, the eyeglass frames obtained in the second step are coated with a colorless polyurethane resin paint (MIKUNI PAINT KK).
Spray-painted with (Product Name: 2NY Nylon Clear),
After being left indoors for 2 hours, the paint was left in an open air at 50° C. for 3 hours to harden the paint.

The eyeglass frames obtained in this way have an excellent pattern,
The surface of the eyeglass frame also had excellent gloss.

Further, no practical deformation occurred at all.

(Example I) The present invention was carried out as follows using the eyeglass frame obtained in the first step of Example (2).

In the second step, a floral pattern was drawn on the surface of the eyeglass frame using a brush with sublimable dye ink, and then left in an open oven at 146°C for 1 hour, taken out, cooled at room temperature, and then ethyl Excess sublimable ink on the surface of the eyeglass frame was removed using gauze soaked in alcohol.

In the third step, the glasses 1 obtained in the above second step are
? Acrylic resin paint colored in a light transparent color (Nippon Kagaku Toyo Co., Ltd. - Product name: Neogamica Aclor C)
The paint was spray-painted, left at room temperature for 80 minutes, then left in an open air at 150° C. for 80 minutes to cure the paint, and then the lens frame was taken out and cooled.

The thus obtained eyeglass frame has a complex and excellent pattern as the sublimable dye ink used in the second process is partially transferred to the paint film applied in the third process, and also has a glossy surface. It was excellent. Further, no practical deformation occurred.

Comparative Examples 1, 2, and 3 The polymethylpentene resin in Example I was replaced with polymethyl methacrylate resin (Mitsubishi Rayon Co., Ltd., product name: Niacrivet ■, grade VH), polycarbonate resin (Teijin Kasei Co., Ltd., product name: Pan) light ■,
Grade L1225), transparent nylon resin (Ms Japan Co., Ltd., product name: Grilamid, grade TR-
55LX) and molded under the optimum injection molding conditions for each resin to obtain eyeglass frames.

Next, in the same way as in the second step of Example 3, the sublimable dye was brought into contact with the surface of each eyeglass frame using transfer paper, and then
After leaving it for 30 minutes while the temperature was open, I took it out.
It was severely deformed and was practically unusable. By the way,
The heat distortion temperature of each resin is Acrybet ■, grade VH1
00'C, Panlite■, Grade L 1225 12
0℃, ° Grilamid, grade TR-55LX95℃
was the same as or higher than that of polymethyllanthene resin.

Furthermore, depending on the purpose and to increase commercial value, ultraviolet absorbers, antistatic agents, colorants, luminescent agents, infrared absorbers, metal powders, etc. can be added to the paint used in the present invention. .

(effect).

As is clear from the above, the eyeglass frame obtained by the present invention is about 40% lighter than a cellulose resin eyeglass frame,
Moreover, when used, it does not deform due to heat or humidity, and is not affected by sweat, cosmetics, or hair styling products, making it an extremely excellent invention from a social perspective.

Patent applicant: Takeda Color Co., Ltd. 6.

Claims (1)

[Claims] A first step of molding into an eyeglass frame using a thermoplastic resin injection molding machine using polymethylpentene resin having thermoplasticity, and after contacting a part or all of the surface of the molded eyeglass frame with a sublimable dye, It consists of a second step of leaving it under high temperature conditions of 140°C to 170°C for 5 minutes to 1 hour, and a third step of painting part or all of the surface of the eyeglass frame obtained in the second step with paint. A method of manufacturing an eyeglass frame having a pattern.