JPH11183854A - Sunglasses - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the sunglasses which have small adverse influence in discard environment by forming at least part of them of a biodegradable resin composition. SOLUTION: The sunglasses which are formed at least partially of the biodegradable resin composition are used. This biodegradable resin composition used for the sunglasses is resin which has characteristics similar to those of synthetic resin in normal use environment, but is gradually degradable in discard environment. As the biodegradable resin composition, there are polyester consisting of hydrocarboxylic acid and/or fatty acid multivalent alcohol and fatty acid polybasic acid, their polymer blend, etc. As the hydrocalboxylic acid in use, there are, for example, lactic acid, glycol acid, 2-hyxroxy butyric acid, 3-hydroxy lactic acid, 2-hydroxy isolactic acid, 2-hydroxy-2-methyl lactic acid, etc., which are used individually or mixedly. Lactic acid is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sunglasses comprising a resin composition mainly composed of an aliphatic polyester which is decomposable in a natural environment.

[0002]

2. Description of the Related Art In recent years, sunglasses have been increasingly used not only for protecting eyes but also for fashion. As a result, the amount used has increased and the amount discarded has also increased. As a material for sunglasses, a synthetic resin-based resin composition such as polypropylene is often used, and after use, it is generally discarded (landfilled or incinerated) together with general garbage.

[0003]

SUMMARY OF THE INVENTION The amount of synthetic resin used tends to increase year by year, and the amount of synthetic resin waste increases accordingly, and its treatment has become a major social problem worldwide. In the case of landfill disposal, synthetic resin does not decompose in the natural environment, so it remains semi-permanently and causes a shortage of disposal sites. In the case of incineration, there are problems such as generation of toxic gas and damage to the incinerator due to high combustion heat. In addition, when dumped, there are problems such as damage to the landscape and destruction of the living environment of marine life. Therefore, an object of the present invention is to provide sunglasses that solve these problems and have less adverse effects in a waste environment.

[0004]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that sunglasses that achieve the above objects can be obtained by using a biodegradable resin composition for at least a part thereof. Was completed.

That is, the present invention provides sunglasses characterized in that at least a part thereof is constituted by a biodegradable resin composition.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The biodegradable resin used in the sunglasses of the present invention has the same properties as a synthetic resin in a normal use environment, but is a resin that gradually decomposes in a waste environment.

Examples of the biodegradable resin used in the present invention include hydroxycarboxylic acids and / or polyesters composed of aliphatic polyhydric alcohols and aliphatic polybasic acids, and polymer blends thereof.

The hydroxycarboxylic acids used include, for example, lactic acid, glycolic acid, 2-hydroxybutyric acid and 3-hydroxybutyric acid.
Examples thereof include hydroxybutyric acid, 4-hydroxybutyric acid, 2-hydroxyisobutyric acid, and 2-hydroxy-2-methylbutyric acid, and these may be used alone or as a mixture of two or more.
Preferably, lactic acid is used.

Examples of the aliphatic polyhydric alcohol include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, and 3-methyl-
1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, neopentyl glycol, polytetramethylene glycol, 1,4-cyclohexanedimethanol, 1,4-benzenedimethanol,
Trimethylolpropane, trimethylolethane, trimethylolheptane, 1,2,4-butanetriol,
1,2,6-hexanetriol and the like. These may be used alone or in combination of two or more. Preferably, 1,4-butanediol is used.

The aliphatic polybasic acids include, for example, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecandioic acid, dodecandioic acid, fumaric acid Acid, maleic acid, tricarballylic acid and the like. These may be used alone or in combination of two or more. Preferably, succinic acid is used.

In addition, other monomers may be used in combination as long as the object of the invention is not impaired. Examples of the monomers used include aromatic hydroxycarboxylic acids such as hydroxybenzoic acid, diphenols such as hydroquinone, aromatic polybasic acids such as phthalic acid, and hydroxyl groups such as malic acid, citric acid and tartaric acid, and carboxyl groups. Compounds having both groups in the molecule, at least one of which is two or more, may be mentioned.

The molecular weight of the biodegradable resin used in the present invention is not particularly limited as long as it has a molecular weight that provides mechanical strength that can be used as sunglasses, but is one of the measures of molecular weight. Logarithmic viscosity ηinh (solvent:
Chloroform, solution concentration: 0.5 g / dl, measurement temperature:
25 ° C., Ubbelohde viscometer) is 0.5 to 3.0 dl / g.
It is preferred that More preferably, 0.6 to 2.
5 dl / g. When the logarithmic viscosity is less than 0.5 dl / g, the resin has no practical mechanical strength and has a viscosity of 3.0 dl / g.
If it is more than g, there is a case where there is a problem because the moldability decreases.

The method for producing the biodegradable resin used in the present invention is not particularly limited, and a conventionally known general method can be used. For example, there are a direct polycondensation method, a method via an acyl halide compound, an active esterification method, a ring-opening polymerization method of a cyclic dimer, and the like.

Further, other thermoplastic resins can be added in an appropriate amount according to the purpose within a range not to impair the object of the present invention. Examples of the thermoplastic resin that can be blended include polyethylene, polypropylene, polystyrene, polycarbonate, polyamide, polyphenylene ether, polyacetal, and the like.

It is also possible to mix a filler according to the purpose. For example, wear resistance improving materials such as fluororesins,
Reinforcing material such as glass fiber, flame retardant improving material such as antimony trioxide, magnesium carbonate, calcium carbonate, acid resistant improving material such as barium sulfate, silica, calcium metasilicate, etc.
In addition, metal oxides such as silicon resin, talc, clay, mica, diatomaceous earth, alumina, and titanium oxide, coloring agents, pigments, carbon black, bluing agents, ultraviolet absorbers, antioxidants, release agents, lubricants, Various stabilizers and plasticizers.

The biodegradable resin composition of the present invention can be molded by the same ordinary molding method as that of a general synthetic resin.

[0017]

EXAMPLES The present invention will now be described with reference to Production Examples and Examples, but the present invention is not limited thereto. Production Example 1 Tin oxide (SnO) powder 0.3 in 100 g of 90% L-lactic acid
g at 150 ° C./normal pressure for 1 hour,
The mixture was stirred at 100 mmHg for 1 hour to distill water. There, orthodichlorobenzene (hereinafter abbreviated as ODCB) 20
0 g was charged and heated at 150 ° C./340 mmHg to distill water together with the solvent. The distilled water and the solvent were separated in a separator, and only the solvent was returned to the reaction system. After 5 hours, when water stopped distilling, the distilled solvent was allowed to return to the reaction system after passing through the column filled with molecular sieve 3A, and the reaction was carried out at 120 ° C / 130 mmHg for 30 hours. 250 g of ODCB was added to the obtained polymer solution, and the mixture was cooled to room temperature. The precipitated powder was filtered, and a filtered product was added to a mixed solution of 8 g of concentrated hydrochloric acid and 300 g of isopropyl alcohol (hereinafter abbreviated as IPA), and the mixture was stirred at room temperature for 1 hour. After filtration and washing with IPA, drying was performed to obtain a polylactic acid powder 67.
g was obtained. The logarithmic viscosity of the obtained polymer is 1.0 dl /
g.

Production Example 2 To 59 g of succinic acid and 45.5 g of 1,4-butanediol, 0.3 g of tin oxide (SnO) powder was added, and the mixture was added at 150 ° C./normal pressure for 1 hour, and then at 150 ° C./100 mmHg for 1 hour. The mixture was stirred to distill water. 250 g of ODCB was charged therein, and the distilled solvent was returned to the reaction system after passing through a column filled with molecular sieve 3A.
/ 130 mmHg for 15 hours. 800 g of ODCB was added to the obtained polymer solution and cooled to room temperature. The precipitated powder was filtered, and 8 g of concentrated hydrochloric acid and 300 g of IPA
Was added to the mixed solution, and the mixture was stirred at room temperature for 1 hour.
After filtration, IPA washing and drying, 81 g of polybutylene succinate powder was obtained. The logarithmic viscosity of the obtained polymer was 0.95 dl / g.

Preparation Example 3 Tin oxide (SnO) powder 0.3 in 100 g of 90% L-lactic acid
g at 150 ° C./normal pressure for 1 hour,
The mixture was stirred at 100 mmHg for 1 hour to distill water. 200 g of ODCB was charged there, and a separating pipe was attached to separate the distilled water and the solvent so that only the solvent returned to the system.
The reaction was carried out at 50 ° C./340 mmHg for 5 hours to obtain polylactic acid.

Next, 59 g of succinic acid, 45.5 g of 1,4-butanediol and 0.3 g of tin oxide (SnO) powder were added to
0 ° C / normal pressure for 1 hour, then 150 ° C / 100mmHg
For 1 hour to distill off water. ODCB250 there
g, and the solvent was distilled off at 120 ° C./130 mmHg for 15 hours so that the distilled solvent passed through the column filled with molecular sieve 3A and then returned into the reaction system. A mixture of 10 g of this reaction product and 190 g of the polylactic acid reaction product was heated at 120 ° C. so that the distilled solvent passed through a column filled with molecular sieve 3A and then returned to the reaction system.
/ 130 mmHg for 25 hours. 450 g of ODCB was added to the obtained polymer solution, and the mixture was cooled to room temperature. The precipitated powder was filtered, and 8 g of concentrated hydrochloric acid and 300 g of IPA
Was added to the mixed solution, and the mixture was stirred at room temperature for 1 hour.
After filtration and IPA washing, drying was performed to obtain 46 g of the copolymer powder.
I got The logarithmic viscosity of the obtained polymer is 0.85 dl /
g.

Example 1 After mixing the polymer obtained in Production Example 1 with a coloring agent, the mixture was pelletized by an extruder, and the obtained pellets were molded by an injection molding machine to produce sunglasses. The obtained sunglasses had the same strength, feeling of use, and the like as compared with conventional synthetic resin products, and were sufficiently practical without any problem.

Example 2 After mixing the polymer obtained in Production Example 2 with a coloring agent, the mixture was pelletized by an extruder, and the obtained pellets were molded by an injection molding machine to produce sunglasses. The obtained sunglasses had the same strength, feeling of use, and the like as compared with conventional synthetic resin products, and were sufficiently practical without any problem.

Example 3 90 parts by weight of the polymer obtained in Production Example 1, 10 parts by weight of the polymer obtained in Production Example 2, and a coloring agent were mixed, and the mixture was pelletized by an extruder. To produce sunglasses. The obtained sunglasses had the same strength, feeling of use, and the like as compared with conventional synthetic resin products, and were sufficiently practical without any problem.

Example 4 After mixing the polymer obtained in Production Example 3 with a coloring agent, the mixture was pelletized by an extruder, and the obtained pellets were molded by an injection molding machine to produce sunglasses. The obtained sunglasses had the same strength, feeling of use, and the like as compared with conventional synthetic resin products, and were sufficiently practical without any problem.

[0025]

According to the present invention, it is possible to provide sunglasses which contribute to the improvement of environmental destruction due to synthetic resin waste and have less adverse effect on the natural environment under the waste environment.

Claims (4)

[Claims] 1. A sunglass wherein at least a part thereof is made of a biodegradable resin composition. 2. A resin whose biodegradable resin composition is mainly composed of a polyester comprising one or more hydroxycarboxylic acids and / or one or more aliphatic polyhydric alcohols and one or more aliphatic polybasic acids. The sunglass according to claim 1, which is a composition. 3. The sunglass according to claim 2, wherein the hydroxycarboxylic acid is lactic acid. 4. The sunglass according to claim 2, wherein the aliphatic polyhydric alcohol is 1,4-butanediol and the aliphatic polybasic acid is succinic acid.