Thermoplastic Elastomer Pellets Blocking Resistance
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Solution Overview
Problem
Thermoplastic elastomer pellets with hydrogenated block copolymers face issues with blocking and transparency, particularly when used in applications requiring transparency and tackiness, as existing solutions like inorganic fillers and anti-blocking agents often compromise on these properties.
Innovation Solution
Incorporating specific additives such as phenol-based antioxidants and benzotriazole-based light stabilizers within and on the surface of the pellets, ensuring they are soluble in toluene and evenly distributed to enhance transparency and tackiness while providing blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic fillers or polypropylene fine powder are applied to prevent blocking, then blocking resistance is improved, but transparency deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by using specific antioxidants (phenol-based, phosphorus-based, sulfur-based, or amine-based) and light stabilizers (salicylic acid derivatives, benzophenone-based, benzotriazole-based, or hindered amine-based) instead of traditional inorganic fillers. These additives are selected to have appropriate solubility characteristics that prevent blocking while maintaining transparency.
Solution Approach 2:
The patent creates a composite pellet structure containing the hydrogenated block copolymer mixed with specific additives at controlled ratios (0.01-5 parts by mass per 100 parts polymer). This composite approach combines the elastomeric properties of the polymer with the functional properties of the additives to achieve both blocking resistance and transparency.
2Reliability
If anti-blocking agents are used to improve blocking resistance, then blocking resistance is improved, but tackiness deteriorates
Solution Approach 1:
The patent carefully controls the amount of additives (0.01-5 parts by mass per 100 parts polymer) and selects specific types of antioxidants and light stabilizers that provide blocking resistance without excessively reducing tackiness. This parameter optimization resolves the contradiction between blocking resistance and tackiness.
Solution Approach 2:
The patent creates different local compositions within the pellet structure, with additives distributed both inside and on the surface of the pellet. This local quality differentiation allows the surface to have sufficient anti-blocking properties while the bulk material maintains its tackiness and adhesive properties.
3Reliability
If additives are added to improve blocking resistance, then blocking resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functions into a single pellet formulation by incorporating both antioxidants and light stabilizers together with the hydrogenated block copolymer. This merging of functions into one composite material simplifies the overall manufacturing process compared to applying multiple separate coatings or treatments.
Solution Approach 2:
The additives are pre-mixed with the hydrogenated block copolymer during the pellet manufacturing process itself, rather than being applied as post-processing coatings. This preliminary incorporation of additives into the pellet structure streamlines manufacturing by eliminating subsequent coating or treatment steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution achieves both excellent transparency and tackiness in molded articles, improving the pellets' formability and blocking resistance, making them suitable for diverse applications including pressure-sensitive adhesives and medical uses.
Implementation Method 1
5 grams of the additive (b) is soluble in 45 grams of toluene so that a solid of the additive (b) is not confirmed through visual inspection
Data Source
AI summary
Provided are a thermoplastic elastomer composition containing 100 parts by mass of (a) a specified hydrogenated block copolymer and 0.01 to 5 parts by mass of (b) at least one additive selected from an antioxidant and a light stabilizer, wherein the additive (b) is soluble in toluene at room temperature, and the additive (b) exists in the inside and on the surface of the pellet; and a molded article formed from the pellet.