Adhesive tape for plastic lens molding and molding method of plastic lens molded product

Abstract

The present invention provides an adhesive tape for plastic lens molding and a molding method of a plastic lens molded product. The adhesive tape can mold a standard molded product of a plastic lens with high precision, and can produce a molded product with high precision even after long-term storage. The adhesive layer is composed of an adhesive mainly composed of a silicone adhesive, and the silicone adhesive includes an alkenyl-containing silicone adhesive and an alkenyl-free silicone adhesive, and the alkenyl-containing organic silicon adhesive in the adhesive 50-70 parts by weight of the silicone adhesive, 30-50 parts by weight of the silicone adhesive containing no alkenyl groups, and 0.5-1.5 parts by weight of the crosslinking agent and the catalyst relative to the silicone adhesive containing alkenyl groups. The polyorganosiloxane glue (G) in the adhesive is 36-44 parts by weight, the silicone resin (R) is 56-64 parts by weight, the 70°C holding force of the adhesive tape is 80-300 minutes, and the adhesive force is 2.0N / 10mm~6.0N / 10mm.

Description

technical field [0001] The present invention relates to an adhesive tape for plastic lens molding and a plastic lens molding method used when manufacturing a standard molded product having the same thickness and curvature as the final product of plastic lenses such as plastic eyeglass lenses and optical lenses. Background technique [0002] As a conventional method for producing a plastic lens, there is known a method of molding by injection polymerization using a pair of glass molds (molds) and an adhesive tape for sealing (for example, refer to Patent Document 1 and Patent Document 2). In this method, a pair of glass molds are arranged facing each other with a predetermined interval therebetween. Next, an adhesive tape was stuck on the entire circumference of the outer peripheral surface of a pair of glass molds along the circumferential direction, and the cell for polymerization was produced. Thus, the space between the glass molds is sealed with the adhesive tape. Next...

AI Technical Summary

Problems solved by technology

[0007] In the radical reaction type silicone adhesive (peroxide reaction type silicone adhesive), the crosslinking density is adjusted by the amount of organic peroxide as a curing agent effective for the reaction, but for the radical reaction In terms of the amount of generation, the dependence of the atmosphere temperature is large, which is the main cause of instability, and it is difficult to stably obtain the desired crosslink density

On the other hand, in the addition reaction type silicone adhesive, the crosslinking density is adjusted by the amount of the crosslinking agent, but since the reaction speed is slow compared with the free radical reaction, the content of the alkenyl group causes the crosslinking density to be greatly increased. changes, and may lead to an increase in cross-linking density over time, it is difficult to stably obtain the desired cross-linking density

[0008] In addition, as the adhesive of the adhesive tape for plastic lens molding, among the commonly used silicone-based adhesives, low-molecular-weight siloxanes (mainly cyclic or linear dimethyl polymers of 3 to 20-mers) are contained. siloxane) as impurities, but these impurities are eluted from the adhesive layer and mixed into the resin when the lens monomer resin is polymerized. Therefore, in the past, it may occur in the interior and outer periphery of the cured plastic lens. cloudy

[0009] As described above, the purpose is to provide a standard molded product that can be molded with good precision and have the same thickness and curvature as the final product as a plastic lens, and further, can suppress chipping, whitening, and cracks on the outer peripheral surface of the molded standard molded product. In the case of adhesive tapes for molding plastic lenses that can be used stably even after long-term storage, and adhesive tapes for molding plastic lenses, concerns about silicone-based adhesives that are excellent in yield and are used to obtain good products Appropriate design and molding methods have not yet been fully clarified and studied.

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