PELESTAT 1251

The examples on pages 4 to 8 are the results of performance tests using ABS resins and MS resins mixed with PELESTAT 1251. This product imparts a permanent antistatic property to these thermoplastic resins that cannot be attained by any other conventional blend-type, low-molecular-weight antistatic agents. Furthermore, this product minimally affects the physical properties of these thermoplastic resins because this product is highly compatible with them.
1. Application to ABS Resins
A. Relationship Between Amount of PELESTAT 1251 and Resulting Surface Resistivity
The ABS resin containing PELESTAT 1251 is highly antistatic when the amount of this product added is between 10 and 15 wt %. Refer to Figure 3 and determine the optimal amount according to the desired surface resistivity.

                    Relationship Between Amount of PELESTAT 1251 and Surface Resistivity

Materials and Methods:
Materials:
A predetermined amount of PELESTAT 1251 was dry-blended with the ABS resin and the mixture was kneaded using a twin-screw extruder at approx. 230°C (446°F). The kneaded compound was then molded using an injection molding machine [nozzle temperature: approx. 230°C (446°F), mold temperature: approx. 50°C (122°F)] into samples 2 mm (approx. 0.08 inches) in thickness.
Method:
Each sample was kept at 23°C (73°F), 50 % R.H. for 24 hours. Then, the surface resistivity of each was measured with a megohmmeter according to ASTM D 257.

B. Effect on Surface Resistivity When Washed with Water (Evaluation of Durability of Antistatic Effect)
The surface resistivity of the ABS resin blended with PELESTAT 1251 minimally changes, remaining antistatic even when washed with water. This product imparts a permanent antistatic property that cannot be attained by any other conventional blend-type, low-molecular-weight antistatic agent, which loses its antistatic property after being washed with water approximately three times.

                                           Number of Washings with Water (times)

                           Figure 4. Effect on Surface Resistivity When Washed with Water

Materials and Methods:
Materials:

• PELESTAT 1251 (15 wt %) / ABS resin PELESTAT 1251 (15 wt %) was dry-blended with the ABS resin and the mixture was kneaded using a twin-screw extruder at approx. 230°C (446°F). The kneaded compound was then molded using an injection molding machine [nozzle temperature: approx. 230°C (446°F); mold temperature: approx. 50°C (122°F) ] into samples 2 mm (approx. 0.08 inches) in thickness.
• Conventional low-molecular-weight anionic antistatic agent (2 wt %) / ABS resin A conventional blend-type, low-molecular-weight antistatic agent, a Sanyo Chemical product, was applied. These samples were prepared by using the method described above.
• Method:Each sample was submerged in water and their surfaces were rubbed with a cotton cloth. The samples were dried under reduced pressure [133 Pa (0.02 psi)] at 70°C (158°F) for 2 hours and were kept at 23°C (73°F), 50 % R.H. for 24 hours. The surface resistivity was measured with a megohmmeter according to ASTM D 257. This process was repeated according to the number of washings with water as described in Figure 4.

C. Effect of Humidity on Surface Resistivity
The surface resistivity of the ABS resin blended with PELESTAT 1251 minimally changes even in low humidity due to this product’s low dependency on humidity. Conversely, an ABS resin blended with any other conventional low-molecular-weight antistatic agent loses its antistatic property in low humidity.

                                                               Humidity (% R.H.)

                                          Effect of Humidity on Surface Resistivity

Materials and Methods:
Materials:
See Figure 4.
Method:
Each sample was kept at 23°C (73°F) at a predetermined humidity for 24 hours. Then, the surface resistivity of each was measured using a megohmmeter according to ASTM D 257.

D. Effect on Resin Physical Properties
As shown in Table 1, PELESTAT 1251 minimally affects the resin’s properties of ABS resin.

Materials and Methods:
Materials:
Surface resistivity
PELESTAT 1251 (15 wt %) was dry-blended with an ABS resin and the mixture was molded using an injection molding machine under the same conditions as described in Figure 4 into samples 2 mm (approx. 0.08 inches) in thickness.

• Other mechanical properties Samples were prepared under the same conditions described in Figure 4 except that the predetermined size described in ASTM was applied. ABS resin was also molded under the same conditions.

Methods:
See the ASTM No. described in Table 1.
(The testing method for surface resistivity is described in Figure 3.)

E. Dispersibility of PELESTAT 1251 in ABS Resins
As shown in Figure 6, PELESTAT 1251 is finely dispersed in the ABS resin.

Figure 6. Transmission Electron Micrograph of Molding (TEM photo) Composed of PELESTAT 1251 (15 wt %) and ABS Resin
[Explanation of Photograph]
Black stripes: PELESTAT 1251
Black particles: Butadiene component of ABS resin
Figure 6 is a magnification (approx. 10,000 times) of a section of the PELESTAT 1251 (15 wt %)/ABS resin mixture described in Figure 4. This product (black stripes) is dispersed in ABS Resin (white portion) and works as a conductive network.

2. Application to MS Resin
A. Effect on MS Resin's Physical Properties
As shown in Table 2, PELESTAT 1251 imparts a permanent antistatic property to the MS resin. The compatibility of this product with this resin is excellent, and the resin's physical properties show minimal change.

* Refractive index of the resin: approx. 1.51 [23°C (73°F)]

Materials and Methods:
Materials:

• PELESTAT 1251(15 wt %)/MS resin PELESTAT 1251 (15 wt %) was dry-blended with the MS resin (refractive index: approx. 1.51) and the mixture was kneaded using a twin-screw extruder at approx. 220°C (428°F). The kneaded compound was then molded using an injection molding machine [nozzle temperature: approx. 220°C (428°F); mold temperature: approx. 60°C (140°F)] into a predetermined sample.
•  MS resin The MS resin was molded under the conditions described above. Methods: See the ASTM No. described in Table 2. (The testing method for surface resistivity is described in Figure 3.)
• 
•                    Figure 7. Relationship Between Amount of PELESTAT 1251 and Resin Optical Property

Materials and Methods:
Materials:
A predetermined amount of PELESTAT 1251 was dry-blended with the MS resin (refractive index: approx. 1.51) and the mixture was kneaded using a twin-screw extruder at approx. 220°C (428°F). The kneaded compound was then molded using an injection molding machine [nozzle temperature: approx. 220°C (428°F); mold temperature: approx. 60°C (140°F)] into samples 2 mm (approx. 0.08 inches) in thickness.
Method:
The samples were kept at 23°C (73°F) and 50 % R.H. for 48 hours. Total light transmittance and haze were measured using a hazemeter according to ASTM D 1003.

• PELESTAT 1251 is a polyether-ester-amide type copolymer.
• This product is insoluble in water.
• This product has no flash point (by COC) below 230°C (446°F).
• This product may have low acute oral toxicity.
• Acute oral toxicity (rat): LD50> 2,000 mg/kg (similar product) Based on data from a similar product made by Sanyo Chemical, this product may not be irritating to the skin, but particles may injure cornea, and vapor or fume from molten material causes eye and nose irritation.
• UN dangerous goods regulations are not applied to this product. This product is for industrial use only.