Block Copolymer Antistatic Agent for Durable Resin Film Transparency
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Solution Overview
Problem
Conventional antistatic agents for synthetic resins lack sufficient antistatic performance and durability, leading to issues such as increased contamination, reduced transparency, and poor compatibility with synthetic resins, especially when used in films.
Innovation Solution
A polymer compound composed of a polyester block and a polyether block, formed through a specific reaction involving a diol, a dicarboxylic acid, and an epoxy compound, with a polyether having hydroxyl groups at both ends, is used to create an antistatic agent that enhances compatibility and durability while maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antistatic agent is added to a synthetic resin, then antistatic performance is improved, but durability is insufficient and the agent is easily removed
Solution Approach 1:
The antistatic agent is segmented into two distinct blocks: a polyolefin block for compatibility with the synthetic resin matrix and a hydrophilic polymer block for antistatic functionality. This segmentation allows each block to perform its specific function optimally while maintaining overall agent stability and durability within the resin.
Solution Approach 2:
The invention uses a composite structure where a polyolefin block and a hydrophilic polymer block are alternately bound to form a block copolymer. This composite material approach combines the hydrophobic, compatible polyolefin segment with the hydrophilic, conductive polymer segment, achieving both resin compatibility and durable antistatic performance.
2Reliability
If a coating type antistatic agent is applied to the surface, then antistatic effect is achieved, but the surface becomes contaminated and durability is poor
Solution Approach 1:
The invention merges the antistatic agent with the resin matrix through kneading incorporation, combining the agent uniformly throughout the bulk material rather than applying it as a separate surface coating. This integration eliminates surface contamination issues while maintaining durable antistatic effects, as the agent becomes part of the resin structure itself.
Solution Approach 2:
The block copolymer structure enables the antistatic agent to self-integrate into the resin matrix during the kneading process. The polyolefin block naturally compatibilizes with the synthetic resin, allowing the agent to embed itself uniformly throughout the material without requiring separate coating applications, thereby preventing surface contamination.
3Reliability
If a large amount of conventional antistatic agent is added to achieve sufficient performance, then antistaticity is improved, but compatibility with synthetic resin deteriorates and transparency is reduced
Solution Approach 1:
The block copolymer structure concentrates the hydrophilic antistatic functionality in specific hydrophilic polymer blocks while maintaining polyolefin blocks for resin compatibility. This local quality differentiation allows the agent to achieve sufficient antistaticity in specific regions without compromising overall resin compatibility or transparency, as the compatible polyolefin blocks are distributed throughout the structure.
Data Source
AI summary
Provided are: an antistatic agent capable of durably giving an excellent antistatic effect to a synthetic resin; an antistatic-agent composition containing the same; an antistatic resin composition containing any of these; and a molded product of and a film of the resin composition. The antistatic agent includes one or more polymer compounds (E) obtained by reaction among a diol (a1), a dicarboxylic acid (a2), a polyether (b) having a hydroxyl group at both ends, and an epoxy compound (D) having two or more epoxy groups, wherein the polyether (b) having a hydroxyl group at both ends includes a polyethylene glycol (b1) and a polytetramethylene glycol (b2), and wherein the ratio of the polytetramethylene glycol (b2) is 10 to 80 mol% to the total number of moles of the polyethylene glycol (b1) and the polytetramethylene glycol (b2).