JP4503584B2 - Amorphous polyester resin composition for extrusion molding and molded article thereof - Google Patents

Description

  The present invention relates to an amorphous polyester resin composition for extrusion molding and a molded product thereof. More specifically, the present invention can reduce the molding temperature, reduce the load during molding, and extrude the amorphous polyester resin composition for extrusion with good shapeability and the composition. The present invention relates to a molded article having good color tone and appearance.

Amorphous polyester resin has a large load at the time of extrusion molding and requires molding at a high temperature, so that the viscosity of the resin is drastically reduced and drawdown occurs, resulting in poor formability. In addition, since the molding temperature is set to a high temperature, the resin is easily burnt and discolored. In particular, the light-colored molded product has a poor color tone, and it is difficult to express the color tone as designed.
Therefore, there has been a demand for an amorphous polyester resin composition for extrusion molding which can be extruded at a low temperature, and which can provide a molded article having good dimensional accuracy, appearance and color tone, and a molded article thereof.
For example, Patent Document 1 discloses a polyester resin composition for calender molding obtained by adding an amorphous random copolymer polyester resin containing 80 mol% of an aromatic dicarboxylic acid having 8 to 14 carbon atoms and a repeating unit. It is disclosed. Patent Document 2 discloses a polyester sheet-like molded product in which a fatty acid ester compound is blended as a lubricant. However, Patent Documents 1 and 2 are prior application publications and do not disclose stearyl citrate.
JP 2000-30951 A JP 2000-141572 A

  The present invention can reduce the molding temperature, reduce the load during molding, and has a good shapeability, an amorphous polyester resin composition for extrusion molding, and a color tone obtained by extrusion molding the composition, The object is to provide a molded article having a good appearance.

As a result of intensive studies to solve the above problems, the present inventors blended 0.01 to 5 parts by weight of a fatty acid ester lubricant or a polyethylene wax lubricant with respect to 100 parts by weight of the amorphous polyester resin. The composition thus obtained has a low load on the molding machine during extrusion molding and can be molded at a low temperature, and a molded product having a good appearance and color tone can be obtained. It came to be completed.
That is, the present invention
(1) Amorphous polyester resin composition for extrusion molding, comprising 0.01 to 5 parts by weight of stearyl citrate per 100 parts by weight of amorphous polyester resin,
(2) Extrusion molding according to item 1 wherein the dicarboxylic acid component of the amorphous polyester resin is terephthalic acid, and the glycol component is 60-80 mol% ethylene glycol and 20-40 mol% 1,4-cyclohexanedimethanol. Amorphous polyester resin composition for
(3) The amorphous polyester resin composition for extrusion molding according to item 1 or 2, wherein 1 to 100 parts by weight of an inorganic filler is blended with 100 parts by weight of the amorphous polyester resin, and
(4) A molded product obtained by extruding the amorphous polyester resin composition for extrusion molding according to item 2 or 3,
Is to provide.

  The amorphous polyester resin composition for extrusion molding of the present invention can be stably extruded at a low extrusion temperature and with a small extrusion load current without causing drawdown. The molded product obtained from the composition of the present invention has good surface properties and color tone, and the molded product obtained from the composition containing no pigment is excellent in transparency.

The amorphous polyester resin composition for extrusion molding of the present invention is a composition obtained by blending 0.01 to 5 parts by weight of a fatty acid ester lubricant or a polyethylene wax lubricant with respect to 100 parts by weight of an amorphous polyester resin. is there.
The amorphous polyester resin used in the composition of the present invention is a polyester resin having no crystallinity that does not cause changes in physical properties due to crystallization even when heat treatment is performed. It can be confirmed that the polyester resin does not have crystallinity by appearance of no white turbidity or whitening even when heated. As such an amorphous polyester resin, for example, a copolymer containing terephthalic acid, isophthalic acid or the like as a dicarboxylic acid component and ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol or the like as a glycol component is used. Mention may be made of polyester resins. Among these, a copolyester resin having terephthalic acid as the dicarboxylic acid component and ethylene glycol and 1,4-cyclohexanedimethanol as the glycol components can be suitably used. As the dicarboxylic acid component, terephthalic acid can be used for a dehydration esterification reaction with a glycol component, or dimethyl terephthalate can be used for a transesterification reaction with a glycol component.
A copolymer polyester resin having terephthalic acid as a dicarboxylic acid component and ethylene glycol and 1,4-cyclohexanedimethanol as a glycol component has a glycol component of 60 to 80 mol% and 1,4-cyclohexanedimethanol 20 to 40. It is preferable that it is mol%. Such an amorphous polyester resin is commercially available from Eastman Chemical Company as PROVISTA KODAR PETG (trade name). An amorphous polyester resin in which the dicarboxylic acid component is terephthalic acid and the glycol component is 60 to 80 mol% ethylene glycol and 20 to 40 mol% 1,4-cyclohexanedimethanol can be reused even after heat treatment. Since the physical properties do not deteriorate due to crystallization and the molded product does not whiten, it can be used preferably.

  The fatty acid ester lubricant used in the composition of the present invention is not particularly limited, and fatty acids having 12 to 32 carbon atoms such as lauric acid, palmitic acid, heptadecanoic acid, stearic acid, oleic acid, arachidic acid, behenic acid, and palmityl alcohol , Monohydric aliphatic alcohols such as stearyl alcohol and behenyl alcohol, ester compounds with polyhydric aliphatic alcohols such as glycerin, pentaerythritol, dipentaerythritol and sorbitan, fatty acids and polybasic organic acids and monohydric aliphatic alcohols A complex ester compound of a polyhydric aliphatic alcohol can be used. Examples of such fatty acid ester lubricants include cetyl palmitate, butyl stearate, stearyl stearate, stearyl citrate, glycerol monocaprylate, glycerol monocaprate, glycerol monolaurate, glycerol monopalmitate, glycerol dipalmitate. Tate, glycerol monostearate, glycerol distearate, glycerol tristearate, glycerol monooleate, glycerol dioleate, glycerol trioleate, glycerol monolinoleate, glycerol monobehenate, glycerol mono12-hydroxystearate, glycerol Diacetomonostearate, glycerin citrate fatty acid ester, pentaerythritol adipic acid stearate, montanic acid partially saponified ester Le, pentaerythritol tetrastearate, dipentaerythritol hexastearate, and the like sorbitan tristearate. These fatty acid ester lubricants can be used alone or in combination of two or more. Among these, stearyl citrate can be particularly preferably used. The fatty acid ester lubricant has good compatibility with the amorphous polyester resin, and can improve moldability without impairing the transparency of the resin composition.

There is no restriction | limiting in particular in the polyethylene wax-type lubricant used for this invention composition, For example, a non-oxidation type polyethylene wax, an oxidation type polyethylene wax, an acid-modified type polyethylene wax etc. can be mentioned. These polyethylene wax-based lubricants can be used alone or in combination of two or more. Among these, high acid value oxidized polyethylene wax is particularly suitable because it has good compatibility with the amorphous polyester resin. The molecular weight of the polyethylene wax is preferably 1,000 to 8,000, and more preferably 2,000 to 5,000. The acid value of the high acid value oxidized polyethylene wax is preferably 5 to 30 mg KOH / g, more preferably 8 to 20 mg KOH / g, and further preferably 10 to 15 mg KOH / g. In the composition of the present invention, a fatty acid ester lubricant and a polyethylene wax lubricant can be used in combination.
In the composition of the present invention, the amount of the fatty acid ester lubricant or the polyethylene wax lubricant is 0.01 to 5 parts by weight, more preferably 0.05 to 4 parts by weight with respect to 100 parts by weight of the amorphous polyester resin. Part, more preferably 0.1 to 3 parts by weight. When the blending amount of the lubricant is less than 0.01 parts by weight with respect to 100 parts by weight of the amorphous polyester resin, the effect of the lubricant is poor, the load is large when extrusion molding is performed, and high temperature molding is required. There is a possibility that the down will occur and the formability may be poor. If the blending amount of the lubricant exceeds 5 parts by weight with respect to 100 parts by weight of the amorphous polyester resin, the slipperiness becomes excessive and the moldability deteriorates, the lubricant bleeds on the surface of the molded product, or the plate is formed during molding. There is a risk of causing out. By blending 0.01 to 5 parts by weight of a fatty acid ester lubricant or a polyethylene wax lubricant with 100 parts by weight of the amorphous polyester resin, the molding temperature is lowered, the load during molding is reduced, and the shaping property is reduced. In addition, the color tone and appearance of the molded product can be improved, and a good extruded product can be obtained.

When producing an opaque molded article by extrusion molding of the composition of the present invention, a filler can be blended in the composition. There is no restriction | limiting in particular in the filler to mix | blend, For example, a wood type filler, an organic fiber type filler, an inorganic type filler etc. can be mentioned. Of these, wood fillers and inorganic fillers can be suitably used. Each of the wood filler and the inorganic filler can be blended alone, or both can be blended together.
Examples of the wood filler used in the composition of the present invention include wood powder, cellulose, coconut shell powder, and a wood material obtained by surface treating these. Among these, wood powder can be used particularly preferably because a molded product having a woody appearance can be obtained. The wood-based filler can be produced by pulverizing a wood-based material using a stone mortar, stamp mill, roll mill, impact mill or the like. There is no restriction | limiting in particular in a wood type material, For example, any of a conifer or a broadleaf tree, a deciduous tree, or an evergreen tree can be used. Although there is no restriction | limiting in particular in the average particle diameter of a wood type filler, It is preferable that it is 10-1,000 micrometers, It is more preferable that it is 30-500 micrometers, It is further more preferable that it is 50-250 micrometers. If the average particle size of the wood-based filler is less than 10 μm, there is a possibility that foreign matter is easily formed due to cohesive enlargement. When the average particle diameter of the wood-forming filler exceeds 1,000 μm, it becomes a foreign matter and the molded product may become brittle.
Examples of the inorganic filler used in the composition of the present invention include calcium carbonate, talc, mica, carbon black, magnesium hydroxide, barium sulfate, synthetic silicic acid, titanium oxide, marble powder, diatomaceous earth, graphite, and glass fiber. Mention may be made of inorganic fillers excluding white pigments. Among these, calcium carbonate, talc, and mica can be particularly preferably used because molded articles having good physical properties can be obtained.

In the composition of the present invention, when only the wood filler is blended as the filler, the blending amount is preferably 1 to 100 parts by weight, and 5 to 70 parts by weight with respect to 100 parts by weight of the amorphous polyester resin. More preferably, it is 10 to 50 parts by weight. If the blending amount of the wood filler is less than 1 part by weight with respect to 100 parts by weight of the amorphous polyester resin, the wood texture of the molded product may be insufficient. If the amount of the wood filler exceeds 100 parts by weight with respect to 100 parts by weight of the amorphous polyester resin, the molded product may be brittle.
In the composition of the present invention, when only an inorganic filler is blended as the filler, the blending amount is preferably 1 to 100 parts by weight, and 2 to 50 parts by weight with respect to 100 parts by weight of the amorphous polyester resin. More preferably, it is 3 to 30 parts by weight. If the blending amount of the inorganic filler is less than 1 part by weight relative to 100 parts by weight of the amorphous polyester resin, the effect of imparting rigidity to the molded product may be insufficient. If the blending amount of the inorganic filler exceeds 100 parts by weight with respect to 100 parts by weight of the amorphous polyester resin, the molded product may become brittle.
In the composition of the present invention, when the wood filler and the inorganic filler are blended as the filler, the blend amount of the wood filler is 1 to 80 parts by weight with respect to 100 parts by weight of the amorphous polyester resin. It is preferably 5 to 70 parts by weight, more preferably 10 to 50 parts by weight. The amount of the inorganic filler is preferably 1 to 50 parts by weight, more preferably 2 to 40 parts by weight, and 3 to 30 parts by weight with respect to 100 parts by weight of the amorphous polyester resin. More preferably. If the blending amount of the wood filler is less than 1 part by weight with respect to 100 parts by weight of the amorphous polyester resin, the wood texture of the molded product may be insufficient. If the amount of the wood filler exceeds 80 parts by weight with respect to 100 parts by weight of the amorphous polyester resin, the molded product may be brittle. If the blending amount of the inorganic filler is less than 1 part by weight relative to 100 parts by weight of the amorphous polyester resin, the effect of imparting rigidity to the molded product may be insufficient. If the blending amount of the inorganic filler exceeds 100 parts by weight with respect to 100 parts by weight of the amorphous polyester resin, the molded product may become brittle.

In the composition of the present invention, a modifier can be further blended. Examples of the modifier include methyl methacrylate-butadiene-styrene copolymer (MBS), acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-styrene-acrylate copolymer (ASA), and acrylonitrile- Ethylene propylene rubber-styrene copolymer (AES), polymethyl methacrylate (PMMA), methyl methacrylate-styrene copolymer (MS), chlorinated polyethylene (CPE), ethylene-vinyl acetate copolymer (EVA), Acrylic rubber-methyl methacrylate copolymer, thermoplastic urethane (TPU), polyester elastomer, styrene thermoplastic elastomer alloy, acrylonitrile-butadiene rubber (NBR) alloy, thermoplastic polyester elastomer (TPEE) alloy Etc. can be mentioned.
The composition of the present invention may further contain other additives as necessary. For example, by adding a tea-based pigment to the composition of the present invention in which a wood-based filler is blended, a more excellent wood-like appearance can be expressed and the design can be improved.
The molding method of the amorphous polyester resin composition for extrusion molding of the present invention is not particularly limited, and it is also possible to use a powdery compound blended with the amorphous polyester resin composition, and the composition of the present invention. A pellet-like compound obtained by melting and kneading a product can also be used. There is no restriction | limiting in particular in the manufacturing method of the pellet-form compound formed by melt-kneading, It can manufacture easily using the apparatus and equipment used for mixing and kneading of a normal thermoplastic resin. For example, each component can be simultaneously mixed in a premixer such as a tumbler, Henschel mixer, or ribbon blender and mixed uniformly, or specific components can be separately mixed into the kneader using a quantitative feeder or volumetric feeder. Can also be supplied. The mixture of each component can be supplied to a melt kneader, melt kneaded, extruded from a die, and pelletized using a pelletizer or the like. As a kneading machine to be used, for example, a single screw extruder with a vent, a different direction twin screw extruder, a same direction twin screw extruder or the like can be suitably used. Moreover, it can replace with an extruder and can also use kneading machines, such as a super mixer, a Banbury mixer, a kneader, and a kneader. Among these, when melt-kneading the amorphous polyester resin composition of the wood-based filler, a Banbury mixer is optimal in order to remove moisture from the wood powder.
The molded product of the present invention is a molded product obtained by extruding the amorphous polyester resin composition for extrusion molding of the present invention. The extruder used in the present invention is not particularly limited, and examples thereof include a non-screw extruder such as a ram-type continuous extruder and a gear-type extruder, a screw extruder such as a single-screw extruder and a multi-screw extruder, and the like. it can. There is no restriction | limiting in particular in the shape of the extrusion molded product of this invention, For example, a pipe, a sheet | seat, a profile extrusion molded product, an extrusion blow molded product, an electric wire coating | cover etc. can be mentioned.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
In the reference examples, examples and comparative examples, the mixture mixed using a Henschel mixer was kneaded using a 40 mm twin screw extruder set at a cylinder temperature of 190 ° C. and a die temperature of 190 ° C., and extruded. And pelletized. Using the 40mm twin screw extruder equipped with a 30mm wide and 1mm thick mold, the mold temperature was set to 190 ° C, and the cylinder temperature was lowered from 210 ° C in 5 ° C increments. The lowest cylinder temperature that can be extruded was determined, and the load current of the extruder at that time was recorded. In addition, the formability was evaluated with a case where there was no drawdown and a good tape could be obtained, a case where there was a slight drawdown, and a case where molding was difficult.
The surface of the obtained tape was observed, and the surface properties were evaluated with ○ indicating that the surface was smooth, Δ indicating that the surface was slightly uneven, and × indicating that the surface was extremely rough.
The tapes with fillers were evaluated for color tone by observing the color tone, with ○ as the color tone as designed, △ as slightly yellowish, and × when burnt.
Transparency is evaluated by placing transparent tape with no filler on top of the printed material with 6-point type, where the type is easy to read, ○ is slightly difficult to read, and x is not easy to read. did.

Reference example 1
100 parts by weight of amorphous polyester resin [PROVISTA, Eastman Chemical Co., Ltd.] and 0.5 parts by weight of glycerin monostearate as a lubricant were blended and pelletized, and the tape was extruded.
The lowest cylinder temperature was 190 ° C., and the load current at that time was 38A. A slight drawdown occurred during extrusion. There were some irregularities on the surface of the tape. There was no yellowing in color. Reading the 6-point type was a little difficult.
Reference example 2
Except that the blending amount of glycerin monostearate was 1 part by weight, it was pelletized and the tape was extruded in the same manner as in Reference Example 1.
The lowest cylinder temperature was 185 ° C., and the load current at that time was 35A. No drawdown occurred during extrusion. There were some irregularities on the surface of the tape. No yellowing was observed in the color tone. Reading the 6-point type was a little difficult.
Reference example 3
Except that pentaerythritol adipate stearate was used as the lubricant, it was pelletized and the tape was extruded in the same manner as in Reference Example 1.
The lowest cylinder temperature was 180 ° C., and the load current at that time was 28A. No drawdown occurred during extrusion. The surface of the tape was smooth. There was no yellowing in color. Reading the 6-point type was a little difficult.
Example 1
Except that 0.1 part by weight of stearyl citrate was blended as a lubricant, it was pelletized and the tape was extruded in the same manner as in Reference Example 1.
The lowest cylinder temperature was 195 ° C., and the load current at that time was 32A. A slight drawdown occurred during extrusion. There were some irregularities on the surface of the tape. There was no yellowing in color. The 6-point type was easily readable.
Example 2
Except that the amount of stearyl citrate was 0.5 parts by weight, pelletization was performed and the tape was extruded in the same manner as in Example 1.
The lowest cylinder temperature was 180 ° C., and the load current at that time was 32A. No drawdown occurred during extrusion. The surface of the tape was smooth. There was no yellowing in color. The 6-point type was easily readable.
Example 3
Except that the blending amount of stearyl citrate was 1 part by weight, it was pelletized and the tape was extruded in the same manner as in Example 1.
The lowest cylinder temperature was 165 ° C., and the load current at that time was 20A. No drawdown occurred during extrusion. The surface of the tape was smooth. There was no yellowing in color. The 6-point type was easily readable.
Example 4
Except that the blending amount of stearyl citrate was 2.5 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 1.
The lowest cylinder temperature was 165 ° C., and the load current at that time was 16A. No drawdown occurred during extrusion. The surface of the tape was smooth. There was no yellowing in color. Reading the 6-point type was a little difficult.
Example 5
Except that the blending amount of stearyl citrate was 4.5 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 1.
The lowest cylinder temperature was 165 ° C., and the load current at that time was 14A. Although the slipperiness was slightly high and the molded product was poorly melted, molding was possible. The surface of the tape was smooth. There was no yellowing in color. Reading the 6-point type was a little difficult.
Example 6
Except that glycerin citrate fatty acid ester was used as the lubricant, it was pelletized and the tape was extruded in the same manner as in Reference Example 1.
The lowest cylinder temperature was 170 ° C., and the load current at that time was 25A. No drawdown occurred during extrusion. The surface of the tape was smooth. There was no yellowing in color. The 6-point type was easily readable.

Example 7
100 parts by weight of amorphous polyester resin [PROVISTA, Eastman Chemical Company], 1 part by weight of stearyl citrate as a lubricant, and 3 parts by weight of calcium carbonate [Nitto Flour Chemical Co., Ltd., NS # 400] as an inorganic filler Blended into pellets and extruded the tape.
The lowest cylinder temperature was 170 ° C., and the load current at that time was 20A. No drawdown occurred during extrusion. The surface of the tape was smooth. There was no yellowing in color.
Example 8
Except that the blending amount of calcium carbonate was 5.5 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 7.
Example 9
Except that the blending amount of calcium carbonate was 50 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 7.
Example 10
Except that the blending amount of calcium carbonate was 60 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 7.
Example 11
Except that the blending amount of calcium carbonate was 95 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 7.
Example 12
100 parts by weight of amorphous polyester resin [PROVISTA, Eastman Chemical Co., Ltd.], 1 part by weight of stearyl citrate as a lubricant, and 3 parts by weight of wood flour [Casino, Cellulosin # 100] as a wooden filler And pelletized.
The lowest cylinder temperature was 170 ° C., and the load current at that time was 20A. No drawdown occurred during extrusion. The surface of the tape was smooth. The color tone was as designed.
Example 13
Except that the blending amount of the wood flour was 5.5 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 12.
Example 14
Except that the blending amount of the wood flour was 50 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 12.
Example 15
Except that the blending amount of the wood flour was 90 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 12.
Example 16
Except that the blending amount of the wood flour was 95 parts by weight, it was pelletized and the tape was extruded in the same manner as in Example 12.
Example 17
100 parts by weight of amorphous polyester resin [PROVISTA, Eastman Chemical Co., Ltd.], 1 part by weight of stearyl citrate as a lubricant, 30 parts by weight of wood flour as a wood filler and 5 parts by weight of calcium carbonate as an inorganic filler And pelletized, and the tape was extruded.
The lowest cylinder temperature was 170 ° C., and the load current at that time was 23 A. No drawdown occurred during extrusion. The surface of the tape was smooth. The color tone was as designed.
Example 18
Except that 5 parts by weight of a polyester elastomer [Toray DuPont Co., Ltd., Hytrel 4056] was further added to the formulation of Example 17, pelletization was performed and the tape was extruded.
Reference example 4
Instead of stearyl citrate, pelletizing and tape extrusion were carried out in the same manner as in Example 17, except that 1 part by weight of a saponified ester of montanic acid was blended as a lubricant.
Reference Example 5
Except that the blending amount of the montanic acid partially saponified ester was changed to 4 parts by weight, it was pelletized and the tape was extruded in the same manner as in Reference Example 4.
Reference Example 6
Pellets were formed in the same manner as in Example 17 except that 1 part by weight of oxidized polyethylene wax was blended as a lubricant instead of stearyl citrate, and the tape was extruded.

Comparative Example 1
The tape was extruded into the amorphous polyester resin [PROVISTA, Eastman Chemical Co.] pellet without blending any lubricant or filler.
The lowest cylinder temperature was 210 ° C., and the load current at that time was 45A. During extrusion, intense drawdown occurred. The surface of the tape was extremely rough. The color was slightly yellowish. Reading the 6-point type was a little difficult.
Comparative Example 2
100 parts by weight of amorphous polyester resin [PROVISTA, Eastman Chemical Co., Ltd.] and 6 parts by weight of stearyl citrate as a lubricant were blended, and the tape was extruded.
Although the lowest cylinder temperature was 165 ° C., it was excessively slippery and did not penetrate stably, the load current was not constant, and it was a molded product of a bossobo and could not be evaluated.
Comparative Example 3
Amorphous polyester resin [PROVISTA, Eastman Chemical Co., Ltd.] 100 parts by weight, 15 parts by weight of wood flour as a wooden filler and 5 parts by weight of calcium carbonate as an inorganic filler are pelletized and extruded into a tape. went.
The lowest cylinder temperature was 210 ° C., and the load current at that time was 40A. During extrusion, intense drawdown occurred. The surface of the tape was extremely rough. The wood flour was burnt and the color changed.
Comparative Example 4
100 parts by weight of amorphous polyester resin [PROVISTA, Eastman Chemical Company], 6 parts by weight of stearyl citrate as a lubricant, 15 parts by weight of wood flour as a wood filler, and 5 parts by weight of calcium carbonate as an inorganic filler And pelletized, and the tape was extruded.
Although the lowest cylinder temperature was 170 ° C., it was excessively slippery and did not penetrate stably, the load current was not constant, and it became a molded product of a bossobo and could not be evaluated.
Comparative Example 5
Except that 1 part by weight of calcium stearate was blended as a lubricant instead of glycerin monostearate, pelletization was performed and tape was extruded in the same manner as in Reference Example 2.
The lowest cylinder temperature was 200 ° C., and the load current at that time was 40A. During extrusion, intense drawdown occurred. There were some irregularities on the surface of the tape. There was no yellowing in color. Reading the 6-point type was a little difficult.
Comparative Example 6
Pellets were formed in the same manner as in Example 8 except that 1 part by weight of ethylenebisstearic acid amide was blended as a lubricant instead of stearyl citrate, and the tape was extruded.
The lowest cylinder temperature was 190 ° C., and the load current at that time was 38A. A slight drawdown occurred during extrusion. The surface of the tape was extremely rough. The color was slightly yellowish.
Comparative Example 7
Pellets were formed in the same manner as in Example 14 except that 1 part by weight of behenic acid was blended as a lubricant instead of stearyl citrate, and the tape was extruded.
The lowest cylinder temperature was 200 ° C., and the load current at that time was 40A. During extrusion, intense drawdown occurred. There were some irregularities on the surface of the tape. The wood flour was burnt and the color changed.
Comparative Example 8
Pellets were formed in the same manner as in Example 17 except that 1 part by weight of stearyl alcohol was blended as a lubricant instead of stearyl citrate, and the tape was extruded.
The lowest cylinder temperature was 200 ° C., and the load current at that time was 40A. During extrusion, intense drawdown occurred. There were some irregularities on the surface of the tape. The wood flour was burnt and the color changed.
The results of Reference Examples 1 to 3 and Examples 1 to 6 are shown in Table 1, the results of Examples 7 to 18 and Reference Examples 4 to 6 are shown in Table 2, and the results of Comparative Examples 1 to 8 are shown in Table 3. Show.

As seen in Table 1, in Reference Examples 1 to 3 and Examples 1 to 6 in which 0.01 to 4.5 parts by weight of a fatty acid ester-based lubricant was blended with respect to 100 parts by weight of the amorphous polyester resin, The extrusion temperature is relatively low, and extrusion is possible with a small load current. Except for the fact that Reference Example 1 and Example 1 were slightly drawn down, Example 5 was slightly high in slipperiness, and the molded product was poorly melted, all of the shaping properties were good. Moreover, the color tone of the tape obtained by extrusion molding is good, and the surface properties and transparency are generally good.
As can be seen in Table 2, Examples 7 to 11 in which 1 part by weight of stearyl citrate and 3 to 95 parts by weight of calcium carbonate as an inorganic filler are blended with 100 parts by weight of the amorphous polyester resin. The extrusion temperature is low, it can be extruded with a small load current, and the shapeability is also good. In Example 11 where the blending amount of calcium carbonate was large, the surface property was good and the color tone was not yellowish except that slight irregularities were formed on the surface.
Even in Examples 12 to 16, in which 1 part by weight of stearyl citrate and 3 to 95 parts by weight of wood flour as a wood filler were blended with 100 parts by weight of the amorphous polyester resin, the extrusion temperature was low and the load current was small. Can be extruded with good shapeability. In Example 15 and Example 16 in which the amount of wood powder is large, the surface properties are good and the wood powder does not burn strongly except that slight irregularities occur on the surface and the wood powder is slightly discolored. It was.
Example 17 in which 1 part by weight of stearyl citrate, 30 parts by weight of wood flour and 5 parts by weight of calcium carbonate was blended with 100 parts by weight of the amorphous polyester resin has a low extrusion temperature and can be extruded with a small load current. And formability is also good. Further, the surface of the obtained tape is smooth and the color tone is as designed. Furthermore, even in Example 18 in which 5 parts by weight of a polyester elastomer was added and blended, there was no change in extrusion conditions, shapeability and surface properties, and the color tone was also good.
In Reference Example 4 in which montanic acid partially saponified ester was blended in place of stearyl citrate, the extrusion temperature was slightly high, some irregularities were generated on the surface of the tape, and the color tone was also somewhat poor. Even if the blending amount of the montanic acid partially saponified ester is increased to 4 parts by weight, the situation does not change. Therefore, it is understood that stearyl citrate gives particularly good results among fatty acid ester lubricants.
On the other hand, as can be seen in Table 3, Comparative Example 1 and Comparative Example 3 in which neither the fatty acid ester lubricant nor the polyethylene wax lubricant is added, the extrusion temperature is high, the load current is large, and the drawdown becomes intense. The formability and the surface properties and color of the resulting tape are also poor. Further, in Comparative Example 2 and Comparative Example 4 in which 6 parts by weight of stearyl citrate was blended with 100 parts by weight of the amorphous polyester resin, the slipperiness was excessive, the pellets were poorly bitten, and the extrusion was stably performed. I can't. In Comparative Example 5, in which calcium stearate, which is a fatty acid metal soap, is blended as the lubricant, the minimum cylinder temperature is high and the drawdown is intense. In Comparative Example 6 in which ethylene bis-stearic acid amide, which is a fatty acid amide-based lubricant, was blended, a powdery material was raised on the tape surface. In Comparative Example 7 in which behenic acid, which is a fatty acid lubricant, was blended, the minimum cylinder temperature was high, the drawdown was intense, and the wood flour was burnt. The comparative example 8 which mix | blended stearyl alcohol which is an aliphatic alcohol type | system | group lubricant also had high minimum cylinder temperature, intense drawdown, and the wood powder was burned.

  INDUSTRIAL APPLICABILITY The present invention can be obtained by lowering the molding temperature, reducing the load during molding, and extruding the composition of the amorphous polyester resin composition for extrusion molding having good formability and the composition. It can be used in the field of molded products with good color and appearance.

Claims (4)

  An amorphous polyester resin composition for extrusion molding, comprising 0.01 to 5 parts by weight of stearyl citrate per 100 parts by weight of an amorphous polyester resin.   The amorphous for extrusion molding according to claim 1, wherein the dicarboxylic acid component of the amorphous polyester resin is terephthalic acid, and the glycol components are 60 to 80 mol% of ethylene glycol and 20 to 40 mol% of 1,4-cyclohexanedimethanol. Quality polyester resin composition.   The amorphous polyester resin composition for extrusion molding according to claim 1 or 2, wherein 1 to 100 parts by weight of an inorganic filler is blended with 100 parts by weight of the amorphous polyester resin.   A molded product obtained by extruding the amorphous polyester resin composition for extrusion molding according to claim 2 or 3.