JPH11162330A - Flame retarding polyester resin composition for base of fluorescent lamp excellent in toughness strength and base of fluorescent lamp composed of the resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, as a base material of a fluorescent lamp, a flame retarding polyester resin composition for a base of a fluorescent lamp which is excellent in toughness by which an electrode pin is not cracked at the time of inserting it, and in a tap strength at the time of assembling, and also in toughness strength having deformation resistance to secure safety at the time of handling the fluorescent lamp. SOLUTION: The flame retarding polyester resin composition is produced by blending a thermoplastic aromatic polyester, 100 pts.wt. with (A) an inorganic bulking agent, 0-150 pts.wt., (B) a bromine flame retardant, 5-60 pts.wt. and (C) an antimony flame retarding assistant, 0-20 pts.wt., and has such a toughness strength that a pinning strength at the time of inserting an electrode pin is 60 kgf or over. A limiting viscosity number of the thermoplastic aromatic polyester is 1.0-1.2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant polyester resin composition for a fluorescent lamp base having excellent toughness.
More specifically, the present invention relates to a flame-retardant polyester resin composition for fluorescent lamp bases having an intrinsic viscosity of thermoplastic aromatic polyester in a specific range and excellent in toughness.

[0002]

2. Description of the Related Art Conventionally, polyester resins are often used for lighting parts. However, recently, from the viewpoint of ensuring the safety of products, it is required to impart flame retardancy to materials.

[0003]

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

[0004]

The present inventors have conducted intensive studies to develop a flame-retardant polyester resin composition for a fluorescent lamp base having excellent toughness, and as a result, have found that the intrinsic viscosity of a thermoplastic aromatic polyester is high. The flame-retardant polyester resin composition with excellent toughness, whose number is in a specific range, shows good moldability, and has excellent toughness and resistance to deformation during pin insertion and screw tightening, automation by robots, etc. The present invention has been found to contribute to the efficiency of the process and to enhance the commercial value as a product, and has reached the present invention.

According to the present invention, the above objects and advantages are as follows: (A) 0 to 150 parts by weight of an inorganic filler, (B) 5 to 60 parts by weight of a brominated flame retardant, based on 100 parts by weight of a thermoplastic aromatic polyester. A flame retardant polyester resin composition comprising 0 to 20 parts by weight of (C) an antimony-based flame retardant auxiliary, wherein the thermoplastic aromatic polyester has a limiting viscosity number of 1.0 to 1.2, and an electrode pin This is achieved by a flame-retardant polyester resin composition for a fluorescent lamp base having a toughness with a pinning strength of 60 kgf or more at the time of insertion. Hereinafter, the present invention will be described in detail.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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,
An aromatic polyester composed of at least one kind of aliphatic diol such as tetramethylene glycol, hexamethylene glycol, neopentyl glycol and the like is used as a main component. Among them, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polybutylene naphthalate and the like are preferable. Particularly, polybutylene terephthalate is preferred.

As the thermoplastic aromatic polyester, a part of the above-mentioned polyester, for example, 2
0 mol% or less, preferably 10 mol% or less, may be substituted with a copolymer component. Examples of the copolymer component include isophthalic acid and phthalic acid; alkyl-substituted phthalic acid such as methyl terephthalic acid and methyl isophthalic 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 acids 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; 2,2 ′
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; Oxycarboxylic acids such as oxycaproic acid, hydroxybenzoic acid, and hydroxyethoxybenzoic acid are included. Further, as a branching component to the above aromatic polyester, trimesic acid, acid or glycerin having a polyfunctional ester forming ability such as trimellitic acid,
1.0 mol% of alcohol having polyfunctional ester forming ability such as trimethylolpropane and pentaerythritol
The copolymer may be copolymerized at a ratio of not more than 0.5 mol%, more preferably not more than 0.3 mol%.

[0008] 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 caps. If the ratio is more than 1.2, the melt viscosity is high, the fluidity is reduced, and the moldability is impaired. Here, the intrinsic viscosity number is measured at 35 ° C. using o-chlorophenol as a solvent.

In the present invention, the thermoplastic aromatic polyester is, for example, 30% by weight based on 100% by weight of the total resin.
Other thermoplastic resins can be contained in an amount of up to 10% by weight, preferably up to 10% by weight.

The resin composition of the present invention may optionally contain a polyester elastomer for the purpose of improving toughness. As the polyester-based elastomer, both polyetherester-based and polyesterester-based elastomers can be suitably used. The addition amount of the polyester elastomer is, for example, 30
% By weight, preferably 10% by weight or less.

The inorganic filler (A) used in the present invention is a particulate or amorphous filler such as calcium carbonate, titanium oxide, feldspar-based mineral, clay, white carbon, carbon black, glass beads, etc .; kaolin clay Flakes such as talc, talc, etc .; glass flakes,
A flaky filler such as mica and graphite; a fibrous filler such as glass fiber, carbon fiber, wollastonite, potassium titanate and the like.

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. Preferably it is 0 to 120 parts by weight, more preferably 0 to 100 parts by weight.

The toughness in the present invention is required for a fluorescent lamp base material, 1) toughness which does not crack when inserting an electrode pin, 2) tap strength at the time of assembling, and 3) safety during handling of a fluorescent lamp. Material properties corresponding to the deformation resistance.

In the present invention, the toughness which does not crack when inserting the electrode pin is defined as a fluorescent lamp base (cross section 30 mmφ, center circumference).
48mm) A jig consisting of a guide part of 1.8mmΦ length 5mm, followed by a taper part of slope (15.0-1.8) /40.0 is inserted into a 1.9mmΦ pin insertion hole at a position 10mm or more from the outer edge of 300mm / m.
This means that the pinning strength when inserted at a speed of in. is 60 kgf or more. If the weight is less than 60 kgf, cracks occur when inserting the pins into the fluorescent lamp base, which hinders automation by a robot.

The tap strength in the present invention means that a 4.0 mmΦ tapped screw with a force of 5 kgf is screwed into a 3.0 mmΦ screw hole at a position 10 mm or more away from the outer edge of a fluorescent lamp base (cross section 30 mmφ, center circumference 48 mm). No crack when tightened. Resistance to screw cracking. In the flame-retardant polyester resin composition for a fluorescent lamp base according to the present invention, the occurrence of cracks by this test method is 1 sample or less per 50 samples of the fluorescent lamp base. If one or more cracks occur in every 50 samples according to this test method, cracks occur at the time of screwing in the fluorescent lamp assembling process, making it unusable.

The term "resistance to deformation" in the present invention refers to the resistance to cracking when a fluorescent lamp base having a half-circular cross section is bent by 3 mm so as to bend back to the opposite side of the center of the arc. Say. In the flame-retardant polyester resin composition for a fluorescent lamp base according to the present invention, the occurrence of cracks by this test method is 1 sample or less per 50 samples of the fluorescent lamp base. If more than 1 sample cracks out of 50 samples according to this test method, it will be damaged by the fitting pressure when installing the fluorescent lamp and injured, and cracking due to the pressing force when printing and printing the logo mark in the manufacturing process. It does not stand practical use.

The brominated flame retardant (B) used in the present invention includes brominated bisphenol A compounds, vinyl polymer flame retardants having a brominated substituent, and the like. 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) Can be.

[0018]

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[0019]

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The terminal structure of the brominated bisphenol A-based polycarbonate (I) is not particularly limited, and examples thereof include a 4-t-butylphenyl group and a 2,4,6-tribromophenyl group. The molecular weight of the brominated bisphenol A-based polycarbonates (I) is preferably from 1,000 to 18,000. Brominated bisphenol A-based polycarbonates
The softening point of (I) varies depending on the molecular weight and 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 from 650 to 45,000. The softening point of the brominated bisphenol A epoxy resin (II) varies depending on the molecular weight and molecular weight distribution, but 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 preferred. These flame retardants can be used in combination.

The amount of the brominated flame retardant (B) used in the present invention is 100 parts by weight of the thermoplastic aromatic polyester resin.
The amount is preferably 5 to 60 parts by weight, particularly preferably 10 to 50 parts by weight, per part by weight. The larger the amount of the inorganic filler in the whole composition, the smaller the amount of the flame retardant when a flame retardant auxiliary is used together, but even in that case, at least 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 resulting composition has insufficient flame retardancy.

The (C) antimony-based flame retardant aid used in the present invention functions to enhance flame retardancy by synergistic effect with the (B) bromine-based flame retardant. Examples of suitable flame retardants are Sb2O3 and / or xNa2O.Sb2O5.yH2
O (x = 0 to 1, y = 0 to 4). The particle size of the flame retardant aid is not particularly limited, but is preferably 0.02 to 5 µm.

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 (C) antimony-based flame retardant aid 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 that the content is 20 to 70% by weight based on the flame retardant. If the amount is more than 20 parts by weight, the decomposition of the resin and the compounding agent is promoted, and the properties of the molded product may be deteriorated.

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 and the like within a range not to impair the object of the present invention. Additives, and further, modifiers such as impact modifiers and flow improvers can be included.

The method for producing the resin composition of the present invention is not particularly limited, and a known method can be employed.
That is, after a thermoplastic aromatic polyester, (A) an inorganic filler, (B) a bromine-based flame retardant, and (C) an antimony-based flame retardant are uniformly mixed using a blender or the like, a Banbury mixer, a heating roll, It can be manufactured by various methods such as a method of melting and kneading at a temperature of 230 to 360 ° C, preferably 230 to 290 ° C using a screw or multi-screw extruder. Alternatively, a method in which some of the components of the resin composition are preliminarily kneaded and then kneaded by adjusting the mixing ratio to a predetermined ratio.

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 with reference to the following examples. Parts in the examples mean parts by weight. Further, the characteristics of the molded product were measured by the following methods.

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

Flame retardancy: Evaluated using a test piece having a predetermined thickness in accordance with the method of Subject 94 (UL-94) of Underwriter Laboratories, USA.

Pinning strength: A jig consisting of a guide part of 1.8 mmφ length 5 mm and a subsequent taper part of slope (15.0-1.8) /40.0 is inserted into a 1.9 mmφ pin insertion hole of the fluorescent lamp base 300 mm.
/ Pinning strength when inserted at a 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 in which cracks occurred and the number of samples in which no cracks occurred per 50 samples of the fluorescent lamp cap.

Deformation resistance: Resistance to cracking when a fluorescent lamp cap molded product having a half-circular cross section divided by 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 in which cracks occurred and the number of samples in which no cracks occurred per 50 samples of the fluorescent lamp cap.

[Examples 1 to 3, Comparative Examples 1 and 2] After the components listed in Table 1 were dry-blended uniformly at a predetermined ratio in advance, cylinders were 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, cooled, and cut to obtain a molding pellet.

Next, the injection volume 91
Cylinder temperature: 250 to 2 with an 8 cm ³ injection molding machine
65 ° C, 16-piece hot runner mold manifold temperature: 265 ° C, body temperature: 320 ° C, chip temperature: 3
Under a condition of 20 ° C., mold temperature: 50 ° C., cooling time: 10 seconds, and total molding cycle: 20 seconds, a fluorescent lamp base (30 mm in cross section)
(φ, center circumference 48 mm) A sample was molded and the characteristics of a fluorescent lamp base were evaluated. The pin insertion hole is located at a position 16 mm away from the outer edge of the sample, and the screw hole is located at a position 21 mm away from the outer edge of the sample. Table 1 shows the results.

[0037]

[Table 1]

Examples 1 to 3 all show flame retardancy, indicating that they have the toughness required for fluorescent lamp caps. In Comparative Examples 1 and 2, although they had flame retardancy, they did not reach the level of toughness required for fluorescent lamp caps, and could not be put to practical use.

[0039]

According to the present invention, the fluorescent lamp base material has 1)
Toughness that does not crack when inserting electrode pins, 2) Tap strength at the time of assembly, 3) Flame retardant for fluorescent lamp bases with excellent toughness with deformation resistance to ensure safety when handling fluorescent lamps A polyester resin composition can be provided.

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[Procedure amendment]

[Submission date] December 15, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

The tap strength in the present invention means that a 4.0 mmΦ tapped screw with a force of 5 kgf is screwed into a 3.0 mmΦ screw hole at a position 10 mm or more away from the outer edge of a fluorescent lamp base (cross section 30 mmφ, center circumference 48 mm). No crack when tightened. Resistance to screw cracking. In the flame-retardant polyester resin composition for a fluorescent lamp base according to the present invention, the occurrence of cracks by this test method is 1 sample or less per 50 samples of the fluorescent lamp base. When more than one sample per 50 samples is cracked by this test method, cracking occurs at the time of screwing in the fluorescent lamp assembling process, and it cannot be used.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

The term "resistance to deformation" in the present invention refers to the resistance to cracking when a fluorescent lamp base having a half-circular cross section is bent by 3 mm so as to bend back to the opposite side of the center of the arc. Say. In the flame-retardant polyester resin composition for a fluorescent lamp base according to the present invention, the occurrence of cracks by this test method is 1 sample or less per 50 samples of the fluorescent lamp base. This test method allows more than one sample per 50 samples.
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.

Claims (6)

[Claims] 1. An inorganic filler (0 to 150 parts by weight), a brominated flame retardant (5 to 60 parts by weight), and an antimony flame retardant (C) based on 100 parts by weight of a thermoplastic aromatic polyester. 0-20
Parts by weight, is a flame-retardant polyester resin composition obtained by blending, the intrinsic viscosity of the thermoplastic aromatic polyester is
1.0 to 1.2, and the pinning strength when inserting electrode pins
A flame-retardant polyester resin composition for fluorescent lamp caps having a toughness of 60 kgf or more. 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 flame-retardant polyester for a fluorescent lamp base according to claim 1, wherein (B) the brominated flame retardant is a brominated bisphenol A-based polycarbonate and / or a brominated bisphenol A-based epoxy resin. Resin composition. 4. The flame-retardant polyester resin composition for a fluorescent lamp base according to claim 1, which has a tap strength such that crack generation per 50 samples of the fluorescent lamp base is 1 sample or less. 5. The method according to claim 1, wherein the number of cracks per 50 samples of the fluorescent lamp cap is one or less.
3. The flame-retardant polyester resin composition for a fluorescent lamp base according to 1. 6. A fluorescent lamp base comprising the flame-retardant polyester resin composition for a fluorescent lamp base according to any one of claims 1 to 5.