Acrylic Block Copolymer Pellets Blocking Prevention via Resin Coating
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Solution Overview
Problem
Acrylic block copolymers used in adhesive applications often suffer from blocking issues during processing, which can lead to deterioration in adhesive performance and processability, and existing antiblocking agents like ethylenebisstearamide can cause transparency problems and die buildup.
Innovation Solution
A method involving contact of acrylic block copolymer pellets with an aqueous dispersion containing acrylic resin particles, followed by water removal and additional treatment with acrylic resin particles, to form an adhesive composition that is extruded into a laminate, preventing blocking while maintaining adhesive performance and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ethylenebisstearamide is used as an antiblocking agent on acrylic block copolymer pellets, then blocking is prevented, but transparency of shaped articles decreases and die buildup occurs
Solution Approach 1:
The invention changes the chemical composition parameters of the antiblocking agent from conventional ethylenebisstearamide to a specific acrylic resin composition with controlled molecular weight (5,000-50,000) and glass transition temperature (0-100°C). This parameter change allows effective blocking prevention while avoiding the harmful effects of traditional agents, maintaining transparency and preventing die buildup.
Solution Approach 2:
The invention uses a composite approach by combining acrylic block copolymer with specifically designed acrylic resin particles forming a core-shell structure. The acrylic resin shell acts as an antiblocking layer while being compatible with the base polymer, creating a composite material that prevents blocking without the adverse effects of conventional antiblocking agents.
2Reliability
If conventional antiblocking approaches are used on acrylic block copolymer pellets, then some blocking prevention is achieved, but adhesive performance deteriorates
Solution Approach 1:
The invention applies local quality by creating a core-shell structure where the acrylic resin particles form a thin shell on the surface of the acrylic block copolymer pellets. The shell thickness and composition are locally optimized to provide blocking prevention only on the surface, while the core retains the excellent adhesive properties of the acrylic block copolymer.
Solution Approach 2:
The invention changes the molecular weight parameter of the acrylic resin to be lower (5,000-50,000) than the acrylic block copolymer, and controls the glass transition temperature (0-100°C). These parameter changes ensure the acrylic resin forms an effective antiblocking layer without interfering with the adhesive performance of the main polymer.
3Object-affected harmful factors
If acrylic block copolymer pellets are processed without antiblocking treatment, then transparency and adhesive performance are maintained, but blocking occurs during processing
Solution Approach 1:
The invention introduces acrylic resin particles as an intermediary substance that mediates between the acrylic block copolymer pellets and the processing equipment. These particles act as a lubricating layer during processing, preventing direct contact and blocking between pellets, while being chemically compatible enough not to compromise transparency or adhesive performance.
Solution Approach 2:
The invention creates a composite material system where acrylic resin particles are dispersed on and within the acrylic block copolymer matrix. This composite structure provides the blocking prevention needed for reliable processing while maintaining the optical and adhesive properties of the base acrylic block copolymer.
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 method effectively prevents blocking and maintains the excellent adhesive performance and processability of acrylic block copolymers, ensuring stable extrusion and high-quality laminate production without compromising transparency.
Implementation Method 1
bringing raw pellets of an acrylic block copolymer (A) into contact with an aqueous dispersion (C) containing acrylic resin particles (B)
Implementation Method 2
a step (2) of removing water attached to the pellets
Data Source
AI summary
A laminate production method is provided which can sufficiently prevent the occurrence of blocking without causing deterioration in the outstanding characteristics of acrylic block copolymers such as adhesive performance, and can also ensure excellent processability during extrusion. The laminate production method includes a step (1) of bringing raw pellets of an acrylic block copolymer (A) into contact with an aqueous dispersion (C) containing acrylic resin particles (B) and no surfactants, the acrylic block copolymer (A) including at least one polymer block (a1) including acrylic acid alkyl ester units and at least one polymer block (a2) including methacrylic acid alkyl ester units, a step (2) of removing water attached to the pellets and thereby obtaining pellets (D), and a step (3) of preparing an adhesive composition using an adhesive feedstock including the pellets (D) from the step (2), and extruding the adhesive composition to form an adhesive layer and thereby producing a laminate including the adhesive layer and a substrate layer.