(Meth)acrylic Copolymer Adhesive Coating Workability
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Solution Overview
Problem
Copolymers obtained by copolymerizing macromonomers and vinyl monomers often have insufficient molecular weight and copolymerization ratios, leading to poor coating workability and holding power in adhesive applications.
Innovation Solution
A (meth)acrylic copolymer with a weight average molecular weight of 50,000 to 1,000,000 is developed by polymerizing a monomer mixture containing a macromonomer with a number average molecular weight of 500 to 6000, which is used in an adhesive composition and sheet, ensuring suitable coating methods and adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If copolymers are obtained by copolymerizing macromonomers and vinyl monomers with conventional methods, then adhesive force can be achieved, but molecular weight becomes too large and copolymerization ratio becomes unsuitable, leading to poor coating workability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the number average molecular weight of the macromonomer (500-6000) and the weight average molecular weight of the copolymer (50,000-1,000,000), along with optimizing the copolymerization ratio. These parameter adjustments enable the copolymer to achieve both sufficient adhesive force and good coating workability, resolving the contradiction between strength and ease of manufacture.
2Stability of the object's composition
If simple mixing of two or more kinds of copolymers is performed, then property averaging can be achieved, but the copolymers do not intermix properly and the resulting properties are worse than individual monomer units
Solution Approach 1:
The patent employs composite materials by creating a copolymer that integrates macromonomer units with vinyl monomer units at the molecular level through copolymerization. This chemical bonding ensures proper intermixing and synergistic interaction between different monomer units, achieving both property uniformity and superior adhesive performance that cannot be obtained by simple physical mixing.
3Strength
If macromonomer molecular weight is increased to improve adhesive properties, then holding power can be enhanced, but coating workability deteriorates due to excessive molecular weight
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing an optimal range for the number average molecular weight of the macromonomer (500-6000). This controlled molecular weight range enables the copolymer to achieve sufficient holding power while maintaining appropriate viscosity and flow characteristics for good coating workability, avoiding the drawbacks of both too low and too high molecular weights.
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 (meth)acrylic copolymer provides excellent adhesive force and holding power, enabling effective coating and adhesion in various applications, including hot melt and solution coating methods.
Implementation Method 1
the obtained adhesive has sufficient adhesive force and holding power
Data Source
AI summary
A (meth)acrylic copolymer (A) having a mass average molecular weight of 50,000 to 1,000,000, in which the (meth)acrylic copolymer (A) is obtained by polymerizing a monomer mixture including a macromonomer (a) that has a number average molecular weight of 500 or more and less than 6000 and a vinyl monomer (b), and preferably includes 7 to 40% by mass of a repeat unit derived from the macromonomer (a), has sufficient coating workability, adhesive holding power and adhesive property as an adhesive composition.