Optical Resin Composition for Lenses Preventing Flow Marks
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Solution Overview
Problem
Conventional optical resins used for producing optical parts like lenses lack excellent moldability, often resulting in molding defects such as surface flow marks.
Innovation Solution
An optical resin composition comprising a resin with a structural unit represented by Formula (1) and a binaphthalene compound or its oligomer, as defined by Formula (2), which enhances moldability while maintaining favorable optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical resins are used to achieve high refractive index and low Abbe number, then optical characteristics are improved, but moldability deteriorates causing surface flow marks
Solution Approach 1:
The patent uses a composite resin composition comprising multiple components: cyclic olefin-based resin (providing high refractive index and low Abbe number), binaphthalene compound (providing excellent moldability and preventing flow marks), and optional additives. This composite approach allows simultaneous achievement of superior optical characteristics and moldability that conventional single-resin systems cannot provide.
2Reliability
If resin composition is optimized for optical properties, then refractive index and Abbe number are improved, but molding defects such as flow marks occur
Solution Approach 1:
The binaphthalene compound acts as an intermediary substance that mediates between the optical properties of the cyclic olefin-based resin and the molding process requirements. It specifically prevents flow marks and surface defects during molding while allowing the base resin to maintain its superior optical characteristics of high refractive index and low Abbe number.
Data Source
AI summary
The present invention addresses the problem of providing a novel optical resin that retains favorable optical properties such as high refractive index, and at the same time has superior moldability that prevents molding defects from occurring. This problem is solved by an optical resin composition for lenses that contains a resin having a structural unit represented by formula (1), and a binaphthalene compound and/or a binaphthalene compound oligomer having a structural unit represented by formula (2). A, p, K1, K2, Z, and q in formula (1) are as described in the present specification. R1-R10, a, and b in formula (2) are as described in the present specification.