JP2602699Y2 - Lamp case - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp case which is used as a lamp case for an automobile or a closed-type lighting lamp case and has a glass surface which does not become cloudy.

[0002]

2. Description of the Related Art Conventionally, as a lamp case, a sheet metal or a molded article of an unsaturated polyester resin composition has been used. However, in recent years, the shape of the lamp case has become complicated with the demand for increased functionality, and deep drawing workability has been required for the case material. Molded products are used. FIG. 1 shows a plan view of an automobile lamp unit including an automobile lamp case 1, a glass 2 used in combination with the lamp case 1, and a lamp 3 sealed by the glass 2 and the lamp case 1. FIG. 2 shows a front view of an indoor lamp unit including an indoor lamp case 11, a glass 12 used in combination with the lamp case 11, and a lamp 13 hermetically sealed by the glass 12 and the lamp case 11.

[0003] Further, since the unsaturated polyester resin composition is inferior in moldability, molded articles comprising a polyethylene terephthalate resin composition or a polybutylene terephthalate resin composition having higher productivity have been used.

[0004]

[Problems to be solved by the invention] However, when the heat capacity of the lamp is large or when the lamp and the molded product are close to each other, the temperature of the molded product becomes high, so that the decomposed product or the compound is removed from the molded product. There has been a problem that they sublime and precipitate on the glass surface combined with the molded product, and the glass surface becomes cloudy. For this reason, the use of polyethylene terephthalate or polybutylene terephthalate resin molded products has been limited.

The present invention has been made to solve the above-mentioned problems, and has an object to not only have good surface properties and moldability, but also to prevent the glass surface from fogging even when used for a long time. It is to provide a lamp case.

[0006]

Means for Solving the Problems The present inventors diligently studied a lamp case which does not fog the glass surface used in combination, and finally completed the present invention. That is, the present invention provides a polyester resin composition containing 0.1 to 5.0 parts by weight of a bisoxazoline compound and 0 to 100 parts by weight of an inorganic reinforcing material with respect to 100 parts by weight of polyethylene terephthalate and / or polybutylene terephthalate. A lamp case characterized by being formed.

The polyethylene terephthalate and polybutylene terephthalate used in the present invention include:
Not only a polymer of ethylene glycol or butylene glycol and terephthalic acid (including its derivative), but also a copolymerized polyester containing at least 80 mol% or more of ethylene terephthalate or butylene terephthalate repeating units. As the copolymerization component, a known acid component and / or glycol component can be used. That is, as the copolymer component, for example, acid components such as isophthalic acid, naphthalene 1,4 or 2,6 dicarboxylic acid, diphenyl ether 4,4 dicarboxylic acid, adipic acid, sebacic acid; ethylene glycol, propylene glycol, butylene glycol , Diethylene glycol, neopentyl glycol, cyclohexane dimethanol,
Glycol components such as 2,2-bis (4-hydroxyphenyl) propane; oxy acids such as p-oxybenzoic acid;

The polyester resins (polyethylene terephthalate, polybutylene terephthalate) used in the present invention usually have an intrinsic viscosity of 0.3 when measured at 30 ° C. with a phenol / tetrachloroethane mixed solvent (6/4 weight ratio). 4 or more, preferably 0.5 or more. In addition, the above polyester resin is mainly used, and polycyclodimethylene terephthalate, an aromatic polyester such as polyethylene naphthalate, polybutylene adipate, polyethylene adipate, an aliphatic polyester such as polylactone, a polycarbonate or the like, and other thermoplastic resins are mixed. Is also good.

The bisoxazoline compound used in the present invention is represented by the following general formula 1.

[0010]

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(In the formula, R represents a divalent organic group, and a hydrogen atom may be substituted with an alkyl group or an aryl group.) As a specific example of the bisoxazoline compound represented by the general formula 1, 2,2'-methylenebis (2-oxazoline), 2,2'-ethylenebis (2-oxazoline), 2,2'-ethylenebis (4-methyl-2-oxazoline), 2,2'-propylenebis (2 -Oxazoline), 2,2'-tetramethylenebis (2-oxazoline), 2,2'-hexamethylenebis (2-oxazoline), 2,2'-octamethylenebis (2-oxazoline), 2,2 ' -P-phenylenebis (2-oxazoline), 2,2'-p-phenylenebis (4-methyl-
2-oxazoline), 2,2'-p-phenylenebis (4,4-dimethyl-2-oxazoline), 2,2'-
p-phenylenebis (4-phenyl-2-oxazoline), 2,2'-m-phenylenebis (2-oxazoline), 2,2'-m-phenylenebis (4-methyl-2
-Oxazoline), 2,2'-m-phenylenebis (4,4-dimethyl-2-oxazoline), 2,2'-
m-phenylenebis (4-phenyl-2-oxazoline), 2,2'-o-phenylenebis (2-oxazoline), 2,2'-phenylbis (4-methyl-2-oxazoline), 2,2 ' -Bis (2-oxazoline),
2,2'-bis (4-methyl-2-oxazoline),
2,2'-bis (4-methyl-2-oxazoline),
2,2'-bis (4-phenyl-2-oxazoline) and the like can be mentioned. Such bisoxazoline compounds may be used alone or in combination of two or more.

In the present invention, the amount of the bisoxazoline compound is based on 100 parts by weight of the polyester resin.
If the amount is less than 0.1 part by weight, which is 0.1 to 5.0 parts by weight, the effect of adding the bisoxazoline compound is small, and if the amount exceeds 5.0 parts by weight, not only the surface properties and fluidity of the obtained molded product are lowered. This is not preferable because the effect of reducing the amount of precipitation does not increase.

The inorganic reinforcing material used as required in the present invention includes fiber reinforcing materials such as glass fiber and carbon fiber, whiskers such as potassium titanate, talc, clay, wollastonite, montmorillonite, bentonite, and calcium carbonate. And the like. The inorganic reinforcing material increases the rigidity and heat deformation temperature of the molded product, and increases the dimensional stability. Therefore, depending on the application, 0 to 100 parts by weight is added to 100 parts by weight of the polyester resin. If the amount exceeds 100 parts by weight, the appearance of the molded article deteriorates, which is not preferable.

When a lamp case made of a composition containing ordinary polyethylene terephthalate resin or polybutylene terephthalate resin is used, a low molecular weight substance contained in the composition or a substance generated by thermal decomposition during use, for example, terephthalic acid Sublimates and precipitates on the glass surface, causing fogging on the glass surface. In the lamp case of the present invention, the fogging is considerably suppressed. The reason for this is not clear,
It is considered that the bisoxazoline compound acts as a catcher for those low-molecular substances and thermal decomposition substances.

The polyester composition may contain additives such as an antioxidant, an ultraviolet absorber, a plasticizer, a lubricant, a flame retardant, an antistatic agent, a release agent, and a colorant according to the purpose and use. preferable.

The method for producing the polyester composition is not particularly limited, and may be carried out by any method. For example, after pre-mixing all components, a method of mixing in an extruder or kneader, or melting of other components into pellets obtained by kneading and blending any number of optional components in an extruder or kneader in advance A method of mixing and the like can be mentioned. The obtained composition does not require a special molding method and molding conditions, and can be molded into the lamp case of the present invention by ordinary molding conditions of thermoplastic polyester resin.

[0017]

Since the lamp case is formed from a resin composition containing a polyethylene terephthalate or polybutylene terephthalate resin, it has good surface properties and moldability. In addition, by blending the bisoxazoline compound with the resin composition, low-molecular-weight substances and pyrolytic substances generated during use are supplemented by the bisoxazoline compound.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. In addition,
Parts and percentages in the examples are on a weight basis. The heat distortion temperature of the injection molded article was measured according to ASTM D648. Further, the amount of deposition on the glass surface was evaluated as follows.

42 × 42 × 2 mm obtained by injection molding
Was placed on a hot plate adjusted to a surface temperature of 200 ° C., covered with a glass weighing bottle having a diameter of 60 mm and a height of 80 mm, and treated for 420 hours. The upper surface of the glass weighing bottle was at about 50 ° C., and white powder mainly composed of terephthalic acid sublimated from the molded product was deposited on the inner surface and devitrified. The amount of the sublimated precipitate was evaluated from the change in weight of the glass weighing bottle.

Examples 1 to 11 and Comparative Examples 1 to 3 Polyethylene terephthalate resin, polybutylene terephthalate resin, glass fiber, talc, bisoxazoline compound and montanic acid ester were premixed in the proportions shown in Table 1, and then biaxially mixed. It was put into a hopper of an extruder and melt-kneaded to obtain a compound chip. After drying this compound chip at 130 ° C. for 4 hours, a cylinder temperature of 27
A flat plate of a test piece was molded by an injection molding machine adjusted to 0 ° C., and the amount of sublimated precipitates was evaluated by the method described above.
In addition, 2,2 '-(1,3
-Phenylene) -bis (2-oxazoline) (1.3 PBD manufactured by Takeda Pharmaceutical Co., Ltd.) was used. The results are shown in Tables 1 and 2. In Table 1, the amount of the sublimate deposited is shown as% by weight based on the molded product, and the load in the measurement of the heat distortion temperature was 18.6 kg / cm ² .

[0021]

[Table 1]

[0022]

[Table 2] As is clear from Tables 1 and 2, it can be seen that the product of the present invention has a reduced amount of sublimated precipitation and maintains transparency. The results corresponded well with the results of the practical test of the lamp case.

[0023]

According to the present invention, it is possible to reduce the amount of sublimate deposited at a high temperature and reduce the fogging of the glass surface while maintaining good surface properties and moldability. Therefore,
The degree of freedom in design is increased, and the device can be used at high temperatures, so that it can be applied to applications that could not be used conventionally.

[Brief description of the drawings]

FIG. 1 is a plan view of a vehicle lamp unit.

FIG. 2 is a front view of the indoor lamp unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp case for automobiles 2 Glass 3 Lamp 11 Lamp case for indoor use 12 Glass 13 Lamp

Claims (1)

(57) [Scope of request for utility model registration] 1. A polyester resin composition containing 0.1 to 5.0 parts by weight of a bisoxazoline compound and 0 to 100 parts by weight of an inorganic reinforcing material with respect to 100 parts by weight of polyethylene terephthalate and / or polybutylene terephthalate. A lamp case.