Hot Melt Adhesive Reducing Stringing and Heat Resistance
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Solution Overview
Problem
Current hot melt adhesives, particularly those containing ethylene-based copolymers, fail to adequately reduce stringing, meet heat resistance, and maintain adhesive strength across a wide temperature range, especially in applications involving cardboards like corrugated cardboard and cartons.
Innovation Solution
A hot melt adhesive comprising a copolymer of ethylene/olefin with 3-20 carbons and a copolymer of ethylene/carboxylic acid ester, where the ethylene/carboxylic acid ester includes a (meth)acrylic acid ester, blended in specific proportions, along with Fischer-Tropsch wax, to enhance heat resistance, thermal stability, and reduce stringing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional hot melt adhesives containing ethylene-based copolymers are used, then adhesion is achieved, but stringing occurs and soils the nozzle and adherend
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating carboxylic acid and its ester in specific proportions (0.1-10% carboxylic acid, 5-50% ester), which changes the adhesive's physical properties to reduce stringing while preserving adhesion
Solution Approach 2:
The patent creates a composite adhesive system combining ethylene-based copolymer with carboxylic acid and its ester components, where the interaction between these materials produces synergistic effects that reduce stringing property while maintaining bonding capability
2Strength
If hot melt adhesive is applied at high temperature to improve adhesion, then bonding strength increases, but heat resistance deteriorates
Solution Approach 1:
The patent adjusts the chemical composition by adding carboxylic acid and ester components that modify the adhesive's thermal properties, enabling it to maintain strength at elevated temperatures without sacrificing heat resistance
3Ease of manufacture
If adhesive composition is simplified for ease of manufacture, then production is easier, but performance in wide temperature range deteriorates
Solution Approach 1:
The patent optimizes the concentration parameters of carboxylic acid (0.1-10%) and its ester (5-50%) to achieve the desired temperature range performance while maintaining a relatively simple formulation that is easy to manufacture
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 adhesive exhibits significantly reduced stringing, excellent heat resistance, and strong adhesive strength across a wide temperature range, making it suitable for applications such as corrugated cardboard and cartons, which can be stored and handled effectively without adhering string-like substances.
Implementation Method 1
adhesion of the adhesive is exhibited after the adhesive is heated and melted, coated to an adherend and then solidified by being cooled
Data Source
AI summary
The present invention provides a hot melt adhesive which is less likely to cause stringing, is excellent in heat resistance and thermal stability, and has excellent adhesive strength in a wide temperature range. Moreover, the present invention provides a paper product produced by using the hot melt adhesive. Disclosed is a hot melt adhesive comprising (A) a copolymer of ethylene/olefin having 3-20 carbons and (B) a copolymer of ethylene/carboxylic acid ester, wherein the amount of the copolymer of ethylene/carboxylic acid ester (B) is from 13 to 35 parts by weight based on 100 parts by weight in total of the components (A) and (B). The hot melt adhesive is preferable when the copolymer of ethylene/olefin having 3-20 carbons (A) includes (A1) a copolymer of ethylene with octene, and the copolymer of ethylene/carboxylic acid ester (B) includes (B1) a copolymer of ethylene with methyl methacrylate.