JP2002053740A - Flame-retardant polyester resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition which can produce a transparent flame-retardant synthetic resin film or sheet excellent in flexibility and easy to handle by using a material for replacing a vinyl chloride resin, without using a halogenated flame retardant. SOLUTION: The flame-retardant polyester resin composition is obtained by mixing 100 pts.wt. polyester resin with 5-50 pts.wt. condensed phosphoric ester having aromatic rings and 5-50 pts.wt. phosphoric ester.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant resin composition, and has flexibility and transparency suitable for processing into sheets, films and the like (hereinafter, "films and sheets"), particularly partition sheets. The present invention relates to a flame-retardant polyester resin composition.

[0002]

2. Description of the Related Art Conventionally, for a partition or a curtain in a factory or the like, a flexible, transparent, flame-retardant synthetic resin film or sheet has been used.
As a synthetic resin film / sheet satisfying this type of demand, a vinyl chloride resin soft film / sheet is used, but when it is disposed of, it generates an acidic gas at the time of incineration, which is preferable in the global environment. Not a thing.

[0003] Therefore, development and examination of a flame-retardant synthetic resin film / sheet made of a material replacing the vinyl chloride resin,
It has been actively conducted so far. As a result, although an olefin-based resin film / sheet having flame retardancy was produced using a resin component instead of a vinyl chloride-based resin as a material, it was difficult to obtain a resin having both transparency and flexibility.

It is also known to add flame retardancy by adding a halogen-based flame retardant. However, at the time of incineration, there was a problem that an acidic gas was generated.

[0005]

Accordingly, the present invention provides
It is possible to produce a flame-retardant synthetic resin film / sheet that is transparent, has excellent flexibility, and is easy to handle, using a material that replaces the vinyl chloride resin and without using a halogen-based flame retardant. It is an object to provide a resin composition.

[0006]

According to the present invention, there is provided a polyester resin having 5 to 50 parts by weight of a condensed phosphate having an aromatic ring, and 5 to 50 parts by weight, based on 100 parts by weight of a polyester resin. It is a flame-retardant polyester resin composition obtained by adding a part of a phosphoric ester.

That is, according to the present invention, a polyester resin is selected as a material replacing the vinyl chloride resin, and a condensed phosphoric ester having an aromatic ring and other phosphoric esters are used as the phosphoric ester flame retardant. Flame retardant,
It is characterized in that a so-called orthophosphate ester is added in combination. The resin composition of the present invention has such characteristics that it can be formed into a film or sheet having excellent transparency and flexibility by using such a flame retardant in combination.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Polyester resins usable in the resin composition provided by the present invention include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polycyclohexane terephthalate (PC).
T) and a copolymer of terephthalic acid / ethylene glycol / 1,4-cyclohexanedimethanol (PET-G). Further, copolymers of isophthalic acid, neopentyl glycol, cyclohexanediol and the like may be used.

On the other hand, the type of the condensed phosphoric acid ester having an aromatic ring as a flame retardant added to the polyester resin used in the present invention is not particularly limited. Has a melting point of 80-2
Preferred is a condensed phosphate ester at 50 ° C.

The so-called orthophosphate ester used in combination with the above-mentioned condensed phosphate ester having an aromatic ring also imparts plasticity to the resin component while having flame retardancy.
Those which are liquid at room temperature are preferably used. Such phosphate esters include trimethyl phosphate,
Triethyl phosphate, tricresyl phosphate,
Trixylenyl phosphate, cresyl diphenyl phosphate, cresyl di (2,6-xylenyl) phosphate, xylenyl diphenyl phosphate, and the like can be given.

In the flame-retardant polyester resin composition of the present invention, the amount of the condensed phosphoric ester having an aromatic ring to be added is 5 to 50 parts by weight, preferably 100 parts by weight of the polyester resin. Is 10 to 30 parts by weight. If the amount is less than 5 parts by weight, the flame retardancy is insufficient, and 50
When the amount exceeds the weight part, the mechanical strength of the formed film / sheet is lowered and the cost is increased, but the flame retardancy is hardly improved.

On the other hand, the amount of the orthophosphoric acid ester added in combination with the condensed phosphoric acid ester having an aromatic ring is 5 to 5 parts by weight based on 100 parts by weight of the polyester resin.
0 parts by weight, preferably 20 to 40 parts by weight. If the amount is less than 5 parts by weight, the flexibility of the formed film / sheet cannot be obtained, and if it exceeds 50 parts by weight, the processing becomes difficult, and the molded products are blocked from each other, and the handling becomes difficult. .

[0013] The resin composition of the present invention may optionally contain
Various additives such as lubricants, antioxidants, antistatic agents, ultraviolet absorbers, light stabilizers, reinforcing agents, pigments, and inorganic / organic fillers can also be added. The type of this type of additive and the amount thereof are not particularly limited, and the additives conventionally used in polyester resins may be added in the same amount as before, depending on the purpose. Good.

The flame-retardant polyester resin composition provided by the present invention is used as a molded product in the form of a sheet or a film, such as a partition or curtain in a factory. In order to obtain such a molded product, the resin composition of the present invention is melted and kneaded with a binder mixer, a twin-screw extruder, a kneading extruder, a roll, or the like, and then extruded by a calendar method or a T-die extruder. It can be molded and suitably manufactured as a film / sheet having a desired thickness. In addition, the thickness of a molded article cannot be limited unconditionally and varies depending on the use of the obtained film / sheet. For example, in the case of a factory partition or curtain, a sheet-like material having a thickness of about 0.01 to 1 mm What is necessary is just to shape | mold.

[0015]

The present invention will be described in more detail with reference to the following Examples, which by no means limit the present invention, and various modifications are also included in the scope of the present invention.

Examples 1 to 5 / Comparative Examples 1 to 3: A polyester resin having the composition shown in Table 1 below and a flame retardant were simultaneously kneaded, and a film having a thickness of 200 μm was obtained by using two 8-inch rolls. In addition, the resin composition of Comparative Example 1 blended only a condensed phosphate ester having an aromatic ring as a flame retardant,
In the resin composition of Comparative Example 2, only the orthophosphate was blended as the flame retardant, and in the resin composition of Comparative Example 3, the orthophosphate was used as the flame retardant and an ammonium phosphate-based A flame retardant was used in combination.

About the obtained film, its transparency,
Flexibility and flame retardancy were tested. The results are shown together in the table.

[0018]

[Table 1]

* 1 Eastar PETG 6763
(Eastman Chemical) * 2 PX200 (Daichi Chemical) * 3 TCP (Daichi Chemical) (liquid at 25 ° C) * 4 Terage C60 (Chisso)

* 5: Transparency was evaluated visually. ○ Transparent × Opaque

* 6: Flexibility was evaluated by touch. ○ Soft △ Semi-hard × Hard

* 7: The flame retardancy was evaluated based on the 45 ° micro burner method specified in Article 4-3 of the Ordinance for Enforcement of the Fire Service Law. ○ Pass × Fail

As is clear from the results in the table, the film molded with the resin component of the present invention has better transparency, flexibility, and flame retardancy than the film of the comparative example. It is understood that it is good.

[0024]

EFFECT OF THE INVENTION The flame-retardant polyester resin composition provided by the present invention, by adopting the above constitution, has excellent flame retardancy, flexibility, and excellent transparency in the form of a film or sheet. It is a flame-retardant resin composition which can be suitably used for a product molded into a resin. Therefore, the flame-retardant resin composition of the present invention, a factory partition, curtains, flame-retardant,
It is useful as a resin composition for producing a sheet-like material requiring transparency and flexibility. In particular, it is a substitute for a vinyl chloride resin composition, and is particularly excellent in that its disposal corresponds to protection of the global environment.

Claims (1)

[Claims] 1. A flame-retardant polyester resin obtained by adding 5 to 50 parts by weight of a condensed phosphoric acid ester having an aromatic ring and 5 to 50 parts by weight of a phosphoric acid ester to 100 parts by weight of a polyester resin. Composition.