Suppressing Impact Strength Degradation of PC/ABS Alloy by Reducing Metal Residues

Mass ABS and polycarbonate (PC) may be alloyed to improve heat resistance, flame retardancy, and injection moldability. However, conventionally, synthetic rubber, which is a raw material for ABS, contains metals due to the influence of raw materials, and when alloyed with PC, the metal residues can decompose the PC, leading to a decrease in impact strength.

Asahi Kasei’s synthetic rubber has grades with metal residues removed from raw materials. Mass ABS using this grade as a raw material can achieve an alloy with excellent impact strength because it reduces metal residues, preventing PC decomposition when alloyed with PC.

Generally, the quality of synthetic rubber is influenced by the presence of impurities and gel. If impurities are present, unexpected reactions can occur, resulting in unstable physical properties or discoloration. If gel is present, the desired physical properties may not be obtained, leading to problems such as poor appearance.

Asahi Kasei’s Low-cis Polybutadiene Rubber used for PC/ABS alloy applications is produced by solution polymerization. Therefore, it is a high-quality product that is colorless, has few impurities, and has very little gel that is insoluble in styrene, which can suppress problems such as physical properties and appearance.

It also excels in cold flow resistance and can maintain the shape of the bale for a long time.

We will propose the optimal grade and provide samples according to your needs. Please feel free to contact us if you are interested in mass ABS applications.

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