Adhesive Composition for Polyethylene and Polypropylene Bonding
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Solution Overview
Problem
Existing adhesive compositions do not exhibit adequate adhesive properties to polyethylene and polypropylene substrates, limiting their use on these plastics.
Innovation Solution
A polymer with a repeating unit derived from a polymerizable compound of N,N-diphenylacrylamide substituted by a C7 to C20 alkyl or C7 to C20 alkoxy group is used, providing excellent adhesive properties and adhesiveness to various plastics, including polyethylene and polypropylene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive compositions use conventional polymers (without long-chain alkyl groups), then they show adequate adhesive properties to some plastics, but they fail to exhibit adequate adhesive properties to polyethylene and polypropylene substrates
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the polymer to include long-chain alkyl groups (C7-C20) or alkoxy groups (C7-C20) at specific positions of the N,N-diphenylacrylamide repeating units. This structural parameter change enables the adhesive composition to achieve adequate adhesive properties to polyethylene and polypropylene substrates, which conventional polymers without long-chain alkyl groups cannot achieve.
2Adaptability or versatility
If adhesive compositions are designed for broad substrate compatibility, then they may require surface modification treatments like UV-ozone treatment, but this adds process complexity and may alter substrate characteristics
Solution Approach 1:
The patent applies the self-service principle by designing a polymer with inherent long-chain alkyl groups that provide self-adhesive capability to polyethylene and polypropylene substrates without requiring external surface modification treatments. The polymer structure itself contains the necessary functional groups (long-chain alkyl or alkoxy groups) that enable direct adhesion, eliminating the need for UV-ozone treatment or other surface preparation steps.
3Reliability
If adhesive compositions use long-chain alkyl groups (C7-C20), then they achieve excellent adhesive properties to polyethylene and polypropylene, but the polymer structure becomes more complex
Solution Approach 1:
The patent applies local quality by introducing long-chain alkyl groups (C7-C20) or alkoxy groups (C7-C20) at specific local positions (phenyl groups) of the N,N-diphenylacrylamide repeating units, rather than modifying the entire polymer structure. This localized structural modification provides the necessary adhesive functionality to polyethylene and polypropylene while maintaining the overall simplicity and processability of the polymer system.
Data Source
AI summary
An object of the present invention is to provide an adhesive composition having excellent adhesive properties and adhesiveness to a variety of plastics such as polypropylene, polyethylene, or a cycloolefin resin. The adhesive composition of the present invention comprises a polymer having a repeating unit derived from a polymerizable compound of the following formula (I): (wherein X1 and X2 each independently represent a C7 to C20 alkyl group or a C7 to C20 alkoxy group; n represents 0 or 1; Z1 and Z2 each independently represent a single bond or a C1 to C3 alkylene group; R each independently represents an organic group or a halogeno group; m1 and m2 each independently represent any integer of 0 to 4; and Y represents a polymerizable functional group).