Polyester-Polyether Antistatic Composition for Stable Resin Pelletizing
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Solution Overview
Problem
Conventional polymer-type antistatic agents suffer from insufficient antistatic performance, storage stability issues such as stickiness and blocking during long-term storage, and poor productivity due to irregular pellet shapes and defects during cutting.
Innovation Solution
A polymer compound composed of a polyester block and a polyether block, bound via ester or ether bonds, formed by reacting a diol and a dicarboxylic acid with an epoxy compound, and a specific diol and dicarboxylic acid, which imparts excellent antistatic performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymer-type antistatic agents are used, then antistatic performance is provided, but storage stability deteriorates due to stickiness and blocking during long-term storage
Solution Approach 1:
The invention changes the chemical structure parameters of the antistatic agent by introducing a specific block copolymer structure with polyolefin blocks and hydrophilic polymer blocks in alternating sequences. This structural parameter change resolves the contradiction by providing both antistatic performance and storage stability, as the specific molecular architecture prevents stickiness while maintaining electrical conductivity.
Solution Approach 2:
The invention uses a composite block copolymer structure combining polyolefin blocks (providing hydrophobicity and structural stability) with hydrophilic polymer blocks (providing antistatic functionality). This composite material approach resolves the contradiction by integrating the advantages of both polymer types while eliminating their individual disadvantages regarding stickiness and storage stability.
2Ease of operation
If polymer-type antistatic agents are cut into pellets, then handling is improved, but productivity deteriorates due to defective cutting and irregular shapes
Solution Approach 1:
The invention changes the physical parameters of the antistatic agent by controlling the molecular weight and crystallinity of the block copolymer. These parameter changes result in pellets with uniform structure and consistent melting behavior, which resolves the contradiction by enabling clean cutting while maintaining ease of handling, thereby improving productivity.
3Reliability
If coating-type antistatic agents are applied to surface, then antistatic effect is achieved, but persistence deteriorates and contamination occurs
Solution Approach 1:
The invention extracts the antistatic functionality from surface coating applications and incorporates it into the bulk polymer structure through kneading. This extraction resolves the contradiction by eliminating the persistence and contamination issues of surface coatings while maintaining effective antistatic performance through internal distribution within the resin matrix.
Data Source
AI summary
Provided are: an antistatic agent which can continuously impart an excellent antistatic effect to a synthetic resin and has excellent storage stability and productivity (cutting property); an antistatic agent composition containing the same; an antistatic resin composition containing the antistatic agent or the antistatic agent composition; and a molded article thereof. The antistatic agent contains at least one polymer compound (E) which is obtained by a reaction of a polyester (a) obtained by a reaction between a diol (a1) and a dicarboxylic acid (a2), a compound (b) containing at least one ethyleneoxy group and having hydroxy groups at both ends, and an epoxy compound (D) containing two or more epoxy groups. The diol (a1) is at least either of 1,4-butanediol and ethylene glycol, and the dicarboxylic acid (a2) is succinic acid or a dicarboxylic acid mixture containing succinic acid.