Ethylene Copolymer Adhesive for Extrusion Lamination
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Solution Overview
Problem
Existing adhesive compositions based on ethylene polymers or copolymers face limitations in adhesion to various substrates, particularly oriented plastic films like polyester (OPET), polypropylene (OPP), and polyamide (OPA), and are sensitive to moisture and high-temperature conditions, with limited versatility in extrusion-coating and extrusion-lamination processes.
Innovation Solution
An adhesive composition comprising unsaturated carboxylic acid ester comonomers greater than 5% by weight and functional comonomers with reactive acid, anhydride, or epoxide groups less than 1% by weight, specifically designed for extrusion-coating and extrusion-lamination, allowing bonding across different substrates over a wide temperature range while being insensitive to moisture and reducing odor emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ethylene/(meth)acrylic acid copolymers are used as adhesive composition, then adhesion to aluminum support is achieved, but adhesion to oriented plastic films (OPET, OPP, OPA) is poor
Solution Approach 1:
The patent uses a composite adhesive composition combining ethylene copolymer base resin with specific functional additives including silane coupling agents andé’› oxide, creating a multi-component system that provides both broad substrate compatibility and reliable adhesion performance across different materials including metals and plastics
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive by controlling the content of carboxylic acid groups (0.5-5 mmol/g) and incorporating specific ratios of silane coupling agents, thereby tuning the adhesive properties to achieve versatile adhesion across different substrate types
2Reliability
If high maleic anhydride content (1.4-2.5 wt %) is used in ethylene/alkyl (meth)acrylate/maleic anhydride terpolymer, then adhesion to aluminum is improved, but sensitivity to moisture increases and adhesion to plastic films deteriorates
Solution Approach 1:
The patent reduces the maleic anhydride content to 0.1-0.6 wt % and controls carboxylic acid group content to 0.5-5 mmol/g, thereby reducing moisture sensitivity while maintaining adhesion performance through compensation by silane coupling agents and titanium oxide additives
Solution Approach 2:
The patent introduces silane coupling agents as intermediary substances that mediate between the adhesive and various substrates, providing moisture resistance and broad substrate compatibility without requiring high maleic anhydride content
3Object-generated harmful factors
If ethylene/(meth)acrylic acid copolymer with low acid content is used, then odor emission is reduced, but adhesion versatility to different substrates is limited
Solution Approach 1:
The patent creates a composite system where ethylene copolymer base resin (providing low odor) is combined with silane coupling agents and titanium oxide, allowing maintenance of low acid content (0.5-5 mmol/g) while achieving versatile adhesion through the synergistic effect of additives
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 composition exhibits improved adhesion properties across a wide range of substrates, maintains performance at high temperatures, and reduces odor levels, demonstrating enhanced versatility and stability compared to conventional adhesives.
Implementation Method 1
An adhesive composition composed of at least one ethylene polymer or copolymer... useful for extrusion-coating and extrusion-lamination
Data Source
AI summary
The invention concerns an adhesive composition consisting of at least one ethylene polymer or copolymer, said composition comprising at least one unsaturated carboxylic acid ester comonomer, and at least one functional comonomer, useful in an extrusion-coating process for application on a support or in an extrusion-lamination process for bonding together several supports of different type or not, in a wide temperature range. The invention is characterized in that said composition has an unsaturated carboxylic acid ester content higher than 5 wt % and in that the functional comonomer consists of at least one reactive function in the form of an acid group, anhydride or epoxy, whereof the proportion is less than 1 wt % of the composition. Said composition has advantageous uses, in particular for bonding together substrates selected among aluminum, paper or cardboard, cellophane, films based of polyethylene, polypropylene, polyamide, polyester, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN) resins, oriented or not, metal-coated or not, physically or chemically treated or not and films coated with a thin inorganic barrier layer, such as polyester (PET, SiOx or AlOx).