Thermoplastic Blocking Agent for Optical Lens Fixation
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Solution Overview
Problem
Existing adhesive compositions for fixing spectacle lens blanks on carriers, such as those based on metal alloys, pose environmental and health risks due to toxicity, are expensive, and have limited recyclability and usability, while plastic compositions often lack optimal physical properties and are difficult to clean.
Innovation Solution
A thermoplastic blocking agent composition that is non-toxic, recyclable, and cost-effective, characterized by high adhesive strength, rigidity, and dimensional stability, with a melting range suitable for processing without damaging the lens, and can be easily unblocked without causing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal alloy adhesive compositions are used for fixing spectacle lens blanks, then high adhesive strength is achieved, but environmental and health risks arise due to toxicity
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive from metal alloys to organic polymers (acrylonitrile-styrene copolymer, polyacrylonitrile, polyacrylic acid, carboxymethyl cellulose) in specific ratios, thereby eliminating toxicity while maintaining adhesive strength through optimized compositional parameters
Solution Approach 2:
The invention uses a composite adhesive composition comprising multiple organic polymer components (acrylonitrile-styrene copolymer as main adhesive, polyacrylonitrile for strength, polyacrylic acid for bonding, carboxymethyl cellulose for stability) that work synergistically to provide metal-alloy-level adhesion without toxicity
2Strength
If metal alloy adhesive compositions are used for fixing spectacle lens blanks, then secure bonding is achieved, but cost increases and recyclability is limited
Solution Approach 1:
The patent employs inexpensive organic polymer-based adhesive compositions that can be easily manufactured and disposed of or recycled, replacing expensive metal alloys. The organic polymers are commercially available at low cost and do not require complex recycling processes
Solution Approach 2:
The invention optimizes the compositional parameters of the adhesive (specific ratios of acrylonitrile-styrene copolymer, polyacrylonitrile, polyacrylic acid, and carboxymethyl cellulose) to achieve cost-effective formulation while maintaining secure bonding performance and enabling easy recycling
3Ease of manufacture
If plastic adhesive compositions are used for fixing spectacle lens blanks, then cost-effectiveness is improved, but physical properties are suboptimal and cleaning becomes difficult
Solution Approach 1:
The patent creates a composite plastic adhesive system combining four different polymer components with complementary properties: acrylonitrile-styrene copolymer for adhesion, polyacrylonitrile for mechanical strength, polyacrylic acid for bonding efficiency, and carboxymethyl cellulose for stability, achieving optimal physical properties while remaining cost-effective
Solution Approach 2:
The invention optimizes the concentration parameters of each polymer component in the adhesive composition to achieve the desired balance between cost-effectiveness and physical performance, ensuring easy cleaning while maintaining strong bonding
4Temperature
If high melting point adhesive compositions are used for fixing spectacle lens blanks, then high temperature resistance is achieved, but lens damage occurs during processing
Solution Approach 1:
The patent selects polymer components and adjusts their compositional parameters to achieve a melting/softening point range of 50-150°C, which provides sufficient temperature resistance for machining processes while remaining below the degradation temperature of plastic lens blanks, thus preventing lens damage
5Ease of operation
If low melting point adhesive compositions are used for fixing spectacle lens blanks, then easy processing is achieved, but bond strength decreases
Solution Approach 1:
The patent uses a composite adhesive system where the acrylonitrile-styrene copolymer provides appropriate melting/softening behavior for easy processing, while polyacrylonitrile and polyacrylic acid components compensate for any bond strength reduction, achieving both ease of processing and sufficient bond strength
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 provides a secure and stable bond during machining processes, prevents shrinkage cracks, and allows for high-quality optical precision with easy removal and recycling, while being environmentally friendly and cost-effective.
Implementation Method 1
a) first the spectacle lens blank is arranged above or to the side of a carrier, in particular a block piece, in such a way that the side and/or surface of the spectacle lens blank to be processed faces away from the carrier and in such a way that between the carrier on the one hand and the spectacle lens blank on the other hand, if necessary with the aid of at least one sealant, a fillable cavity results; (b) the cavity is then at least essentially completely filled with a composition according to invention, which has preferably been liquefied by heating and/or converted into a flowable state; and (c) the composition is subsequently cured and/or solidified, preferably by cooling, to obtain a composite comprising the carrier with the spectacle lens blank fixed thereon by means of the composition
Implementation Method 2
the cavity is then at least essentially completely filled with a composition according to invention, which has preferably been liquefied by heating and/or converted into a flowable state
Implementation Method 3
the composition is subsequently cured and/or solidified, preferably by cooling, to obtain a composite comprising the carrier with the spectacle lens blank fixed thereon by means of the composition
Implementation Method 4
The composition provides a secure and stable bond during machining processes, prevents shrinkage cracks
Data Source
AI summary
The present invention relates to a composition, in particular a blocking agent composition, in particular for fixing blanks for ophthalmic and/or optical lenses, preferably plastics material-based ophthalmic spectacle glass blanks. The composition comprises a mixture containing (a) at least one polyol (polyalcohol) and (b) at least one organic polyester. In addition, the present invention relates to a method for producing a composite structure, which comprises a carrier having a blank fixed thereon, and the composite structure as such. Furthermore, the present invention relates to a method for producing spectacle glass, in particular plastics material-based spectactle glass, and the spectacle lenses that can be obtained therefrom. Finally, the present invention relates to the use of the composition according to the invention in the production of ophthalmic and optical lenses, and for fixing the blank to a carrier.