JP3530365B2 - Flame-retardant polyester resin composition for fluorescent lamp base having excellent toughness and fluorescent lamp base comprising the same - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a flame-retardant polyester resin composition for fluorescent lamp bases, which is excellent in toughness.
More specifically, it relates to a flame-retardant polyester resin composition for a fluorescent lamp base, which has a thermoplastic aromatic polyester with an intrinsic viscosity in a specific range and is excellent in toughness.

[0002]

2. Description of the Related Art Conventionally, many polyester resins have been used for lighting parts, but recently, from the viewpoint of ensuring product safety, materials are required to have flame retardancy.

[0003]

However, a flame-retardant composition containing a flame-retardant agent generally cannot avoid a decrease in mechanical strength. In addition, the fluorescent lamp base material has 1) toughness that does not break when inserting the electrode pin, 2) tap strength during assembly, 3)
It is desirable to have deformation resistance to ensure safety when handling fluorescent lamps. The present invention has been made in view of the above circumstances, and an object thereof is to provide a novel flame-retardant polyester resin composition for a fluorescent lamp base which is excellent in toughness.

[0004]

Means for Solving the Problems As a result of intensive investigations by the present inventors to develop a flame-retardant polyester resin composition for fluorescent lamp bases having excellent toughness, the intrinsic viscosity of the thermoplastic aromatic polyester is found. The flame-retardant polyester resin composition with excellent toughness and number in a specific range shows good moldability, as well as excellent toughness during pin insertion / screw tightening, resistance to deformation, automation by robots, etc. The present invention has been accomplished by finding that it contributes to the efficiency of the process and enhances the commercial value of the product.

According to the present invention, the above objects and advantages are (A) 0 to 150 parts by weight of an inorganic filler, (B ) a brominated bisphenol A-based polycarbonate, and 100 parts by weight of a thermoplastic aromatic polyester.
Odor <br/> Motokei flame retardant 5-60 parts by weight of microcrystal brominated bisphenol A type epoxy resins, (C) Sb ₂ O ₃ and / or _{xNa 2 O · Sb 2 O 5} · yH 2
A flame-retardant polyester resin composition containing 1 to 20 parts by weight of an antimony-based flame-retardant auxiliary agent consisting of O (x = 0 to 1, y = 0 to 4) , which is a thermoplastic aromatic polyester. A toughness having an intrinsic viscosity of 1.0 to 1.2 and a pin striking strength of 60 kgf or more when inserting an electrode pin;
1 sample per 50 samples of fluorescent lamp cap
Less than 50 tap strength, and fluorescent lamp cap 50 sump
This is achieved by a flame-retardant polyester resin composition for a fluorescent lamp base, which has a deformation resistance of 1 sample or less per crack . The present invention is described in detail below.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic aromatic polyester used in the present invention has an acid component of terephthalic acid and / or naphthalene dicarboxylic acid, and a diol component of ethylene glycol, trimethylene glycol,
The main component is an aromatic polyester composed of at least one kind of aliphatic diol such as tetramethylene glycol, hexamethylene glycol, neopentyl glycol. Of these, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polybutylene naphthalate and the like are preferable. Polybutylene terephthalate is particularly preferable.

As the thermoplastic aromatic polyester, a part of the above-mentioned polyester, for example, 2 with respect to the total acid component, is used.
The copolymerization component may be substituted by 0 mol% or less, preferably 10 mol% or less, and examples of the copolymerization component include isophthalic acid, phthalic acid, and alkyl-substituted phthalic acid such as methylterephthalic acid and methylisophthalic acid; Naphthalene dicarboxylic acids such as 2,6-naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid and 1,5-naphthalene dicarboxylic acid; 4,4'-diphenyl dicarboxylic acid, 3,4'-
Diphenyldicarboxylic acids such as diphenyldicarboxylic acid; aromatic dicarboxylic acids such as diphenoxyethanedicarboxylic acid such as 4,4'-diphenoxyethanedicarboxylic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, decanedicarboxylic acid, cyclohexane Aliphatic or alicyclic dicarboxylic acids such as dicarboxylic acids, alicyclic diols such as 1,4-cyclohexanedimethanol, dihydroxybenzenes such as hydroquinone and resorcin;
-Bisphenols such as bis (4-hydroxyphenyl) propane and 2,2'-bis (4-hydroxyphenyl) sulfone; aromatic diols such as ether diols obtained from bisphenols and glycols such as ethylene glycol, ε- Examples thereof include oxycarboxylic acids such as oxycaproic acid, hydroxybenzoic acid and hydroxyethoxybenzoic acid. Further, as a branching component in the above aromatic polyester, trimesic acid, an acid having a polyfunctional ester forming ability such as trimellitic acid or glycerin,
1.0 mol% of alcohol with polyfunctional ester forming ability such as trimethylolpropane and pentaerythritol
The copolymer may be copolymerized at a ratio of preferably 0.5 mol% or less, more preferably 0.3 mol% or less.

The thermoplastic aromatic polyester used in the present invention has an intrinsic viscosity of 1.0 to 1.2. If it is less than 1.0, the mechanical strength is greatly reduced, and it cannot be used as a flame-retardant material for fluorescent lamp bases. When it is larger than 1.2, the melt viscosity is high and the fluidity is lowered to deteriorate the moldability, which is not preferable. Here, the intrinsic viscosity is measured at 35 ° C. using o-chlorophenol as a solvent.

In the present invention, the thermoplastic aromatic polyester is, for example, 30% with respect to 100% by weight of the total weight of the resin.
Other thermoplastic resins may be contained in the range of wt%, preferably 10 wt% or less.

If desired, the resin composition of the present invention may contain a polyester elastomer for the purpose of improving toughness. As the polyester elastomer, either a polyether ester elastomer or a polyester ester elastomer can be preferably used. The amount of polyester elastomer added is, for example, 30
It is not more than 10% by weight, preferably not more than 10% by weight.

The inorganic filler (A) used in the present invention is a granular or amorphous filler such as calcium carbonate, titanium oxide, feldspar minerals, clay, white carbon, carbon black, glass beads, etc .; Kaolin clay , Plate-like fillers such as talc, glass flakes,
Flaky fillers such as mica and graphite; fibrous fillers such as glass fiber, carbon fiber, wollastonite and potassium titanate.

The amount of the inorganic filler (A) used in the present invention is 0 to 150 parts by weight based on 100 parts by weight of the thermoplastic aromatic polyester. The amount is preferably 0 to 120 parts by weight, more preferably 0 to 100 parts by weight.

The toughness in the present invention means the toughness required for a fluorescent lamp base material, 1) toughness that does not break when inserting an electrode pin, 2) tap strength during assembly, and 3) safety when handling a fluorescent lamp. Is a material property corresponding to the deformation resistance.

In the present invention, the toughness that does not break when the electrode pin is inserted means that the fluorescent lamp cap (section 30 mmφ, center part circumference)
48mm) and a 1.9mmΦ pin insertion hole more than 10mm away from the outer edge, and a jig consisting of a 1.8mmΦ length 5mm guide part and a subsequent slope (15.0-1.8) /40.0 taper part 300mm / m
It means that the pin striking strength when inserted at the speed of in. is 60kgf or more. If it is less than 60 kgf, cracks will occur when inserting the pin into the fluorescent lamp cap, which will be a hindrance to automation by the robot.

The tap strength in the present invention means a 4.0 mmΦ tapped screw with a force of 5 kgf into a 3.0 mmΦ screw hole at a position 10 mm or more away from the outer edge of a fluorescent lamp base (30 mmφ in cross section, 48 mm center circumference). It is the resistance to cracking by screwing, which does not crack when tightened. In the flame-retardant polyester resin composition for a fluorescent lamp base of the present invention, the number of cracks generated by this test method is 1 sample or less per 50 samples of the fluorescent lamp cap. If more than one sample per 50 samples is cracked by this test method, cracking occurs during screwing in the process of assembling the fluorescent lamp and it cannot be used.

Deformation resistance in the present invention means resistance to cracking when a fluorescent lamp base molded article having a semicircular cross section divided into two is bent by 3 mm so as to bend back to the side opposite to the center of the arc. Say. In the flame-retardant polyester resin composition for a fluorescent lamp base of the present invention, the number of cracks generated by this test method is 1 sample or less per 50 samples of the fluorescent lamp cap. More than 1 sample per 50 samples by this test method
When the cracking of the Ku occurs, or a corrupted injured by fitting pressure during fluorescent lamp mounting, also unpractical cracked by pressing force at the time of printing baking the logo in the manufacturing process.

Examples of the brominated flame retardant (B) used in the present invention include brominated bisphenol A type compounds and vinyl type polymer flame retardants having a brominated substituent. Suitable brominated bisphenol A-based compounds include brominated bisphenol A-based polycarbonates represented by the following general formula (I) and brominated bisphenol A-based epoxy resins represented by the following general formula (II). You can

[0018]

[Chemical 1]

[0019]

[Chemical 2]

The terminal structure of the brominated bisphenol A-based polycarbonate (I) is not particularly limited, but 4-t-butylphenyl group, 2,4,6-tribromophenyl group and the like can be exemplified. The molecular weight of the brominated bisphenol A-based polycarbonates (I) is preferably 1000 to 18000. Brominated bisphenol A-based polycarbonates
The softening point of (I) varies depending on the molecular weight and the molecular weight distribution, but is preferably in the range of 150 to 300 ° C. The molecular weight of the brominated bisphenol A epoxy resin (II) is preferably 650 to 45,000. The softening point of the brominated bisphenol A epoxy resin (II) varies depending on the molecular weight and the molecular weight distribution, but it is preferably in the range of 100 to 250 ° C.

Of these flame retardants, brominated bisphenol A-based polycarbonates and brominated bisphenol A-based epoxy resins having good discoloration resistance are particularly preferable. These flame retardants can be used in combination.

The amount of the (B) brominated flame retardant used in the present invention is 100% by weight of the thermoplastic aromatic polyester resin 100.
It is preferably 5 to 60 parts by weight, and particularly preferably 10 to 50 parts by weight, per part by weight. The larger the amount of the inorganic filler in the total composition, and the smaller the amount of the flame retardant when the flame retardant auxiliary is used in combination, even in that case, at least in order to achieve the object of the present invention. 5 parts by weight is necessary, and if it is less than 5 parts by weight, the flame retardancy of the resulting composition is insufficient.

The antimony-based flame retardant aid (C) used in the present invention functions to enhance the flame retardancy by a synergistic effect with the (B) bromine-based flame retardant. Examples of suitable flame retardant agents, Sb ₂ O ₃ and / or xNa ₂ O · Sb ₂
O ₅ · yH ₂ O (x = 0 to 1, y = 0 to 4) can be mentioned. Although the particle size of the flame retardant aid is not particularly limited,
02-5 micrometer is preferable.

If desired, those surface-treated with an epoxy compound, a silane compound, an isocyanate compound, a titanate compound or the like can be used.

The amount of the antimony-based flame retardant aid (C) used in the present invention is 0 to 20 parts by weight. Preferably, it is 1 to 15 parts by weight. In order to effectively impart flame retardancy, it is preferable to add 20 to 70% by weight of the flame retardant. If the blending amount exceeds 20 parts by weight, the decomposition of the resin or the compounding agent is promoted and the characteristics of the molded product may be deteriorated, which is not preferable.

The resin composition of the present invention contains a nucleating agent, a lubricant, an antioxidant, an ultraviolet absorber, a light stabilizer, a heat stabilizer, an antistatic agent, a pigment, etc. within a range not impairing the object of the present invention. Additives and also modifiers such as impact modifiers and fluidity modifiers may be included.

The method for producing the resin composition of the present invention is not particularly limited, and known methods can be adopted.
That is, the thermoplastic aromatic polyester, (A) inorganic filler, (B) bromine-based flame retardant, and (C) antimony-based flame retardant auxiliary are uniformly mixed using a blender or the like, and then a Banbury mixer, a heating roll or a single unit. It can be produced by various methods such as melt kneading at a temperature of 230 to 360 ° C., preferably 230 to 290 ° C. using a shaft or multi-screw extruder. It is also possible to preliminarily knead a part of the components of the resin composition and then adjust the mixture ratio to a predetermined value and then knead the mixture.

The fluorescent lamp base in the present invention can be obtained by molding by a known method such as injection molding.

[0029]

The present invention will be described in detail below with reference to examples. In addition, the part in an Example means a weight part. Further, the characteristics of the molded product were measured by the following methods.

Intrinsic viscosity number (IV): measured at 35 ° C. using o-chlorophenol as a solvent.

Flame retardance: Evaluation was performed by using a test piece of a predetermined thickness according to the method of Subject 94 (UL-94) of Underwriter Laboratories, USA.

-Pinning strength: A jig consisting of a 1.8 mmΦ length 5 mm guide part and a subsequent slope (15.0-1.8) /40.0 taper part is 300 mm in the 1.9 mmΦ pin insertion hole of the fluorescent lamp base.
It is the pinning strength when it is inserted at the speed of / min. It was measured using a TCM-100 universal tensile tester manufactured by Minebea Co., Ltd.

Tap strength: Resistance to cracking when a 4.0 mmΦ tapped screw is tightened into a 3.0 mmΦ screw hole with a force of 5 kgf. The evaluation was made based on the number of samples with cracks and the number of samples with no cracks per 50 samples of the fluorescent lamp base.

Deformation resistance: resistance to cracking when a fluorescent lamp base molded product having a semicircular cross section divided into two is bent by 3 mm so as to be warped to the side opposite to the center of the arc. The evaluation was made based on the number of samples with cracks and the number of samples with no cracks per 50 samples of the fluorescent lamp base.

[Examples 1 to 3 and Comparative Examples 1 and 2] The components shown in Table 1 were uniformly dry-blended in a predetermined ratio, and then a cylinder was formed using a vented twin-screw extruder having a screw diameter of 44 mm. The mixture was melt-kneaded at a temperature of 250 ° C. to 260 ° C., a screw rotation speed of 160 rpm, and a discharge rate of 40 kg / h, extruded into a thread shape, cooled and cut to obtain a molding pellet.

Then, using this pellet, an injection volume of 91
Cylinder temperature on an 8 cm ³ injection molding machine: 250-2
65 ℃, 16-piece hot runner mold manifold temperature: 265 ℃, body temperature: 320 ℃, chip temperature: 3
20 ° C, mold temperature: 50 ° C, cooling time: 10 seconds, and total molding cycle: 20 seconds.
(φ, center circumference 48 mm) A sample was molded and the characteristics of the fluorescent lamp base were evaluated. The pin insertion hole is located 16 mm away from the outer edge of the sample, and the screw hole is located 21 mm away from the outer edge of the sample. The results are shown in Table 1.

[0037]

[Table 1]

It can be seen that each of Examples 1 to 3 exhibits flame retardancy and has the toughness required for the fluorescent lamp base. In Comparative Examples 1 and 2, although they had flame retardancy, they could not be put to practical use because they did not reach the level of toughness required for fluorescent lamp caps.

[0039]

According to the present invention, the fluorescent lamp base material is 1)
Toughness that does not break when inserting electrode pins, 2) Tap strength during assembly, 3) Deformation resistance to ensure safety when handling fluorescent lamps Excellent flame toughness for fluorescent lamp caps A polyester resin composition can be provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-268193 (JP, A) JP-A-6-279659 (JP, A) JP-A-5-209114 (JP, A) JP-A-8- 208956 (JP, A) JP 8-239563 (JP, A) JP 11-60920 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 5/50 C08K 3 / 00-13/08 C08L 1/00-101/16 C08G 63/183

Claims (3)

(57) [Claims] 1. (A) 0 to 150 parts by weight of an inorganic filler, (B) a brominated bisphenol A-based polycarbonate, and 100 parts by weight of a thermoplastic aromatic polyester.
Odor <br/> Motokei flame retardant 5-60 parts by weight of microcrystal brominated bisphenol A type epoxy resins, (C) Sb ₂ O ₃ and / or _{xNa 2 O · Sb 2 O 5} · yH 2
A flame-retardant polyester resin composition containing 1 to 20 parts by weight of an antimony-based flame-retardant auxiliary agent composed of O (x = 0 to 1, y = 0 to 4) . Intrinsic viscosity number is 1.0-
1.2, the pinning strength when inserting the electrode pin is 60 kgf or more, the toughness, and the cracking per 50 samples of the fluorescent lamp base.
Fluorescent lamp with tap strength that generates less than 1 sample
1 sample or less per 50 samples of base
A flame-retardant polyester resin composition for a fluorescent lamp base, which has the above deformation resistance. 2. The flame-retardant polyester resin composition for a fluorescent lamp base according to claim 1, wherein the thermoplastic aromatic polyester is polybutylene terephthalate. 3. The fluorescent lamp according to claim 1 or 2.
Fluorescent lamp mouth made of flame-retardant polyester resin composition for base
Money .