Cyclic Olefin Polymer Composition Toughness Transparency
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Solution Overview
Problem
Cyclic olefin polymer compositions used in film and sheet molding lack sufficient durability, particularly in terms of toughness, which is essential for withstanding bending stress during the rolling process, while maintaining transparency and heat resistance.
Innovation Solution
A cyclic olefin polymer composition comprising specific cyclic olefin polymers with a softening temperature of 120 to 300°C and a glass transition temperature of 50°C or lower, combined in specific weight ratios, to enhance durability and optical properties such as transparency and low birefringence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclic olefin polymer composition is used to maintain transparency and heat resistance, then optical properties are improved, but durability and toughness are insufficient
Solution Approach 1:
The invention uses a composite material system consisting of a cyclic olefin polymer (A) with high heat resistance and transparency, combined with a polymer (B) having low glass transition temperature and high flexibility. This composite approach allows the final composition to achieve both durability and toughness while maintaining optical properties, resolving the contradiction between reliability and strength.
Solution Approach 2:
The invention carefully controls the glass transition temperature parameter of polymer (B) to be 50°C or lower, and limits the refractive index difference between polymers (A) and (B) to 0.014 or less. By optimizing these parameters, the composition achieves enhanced toughness and durability without compromising transparency and heat resistance.
2Reliability
If the glass transition temperature is reduced to improve flexibility and toughness, then durability is improved, but heat resistance may be compromised
Solution Approach 1:
The invention combines polymer (A) with high heat resistance (softening temperature 120-300°C) and polymer (B) with low glass transition temperature (50°C or lower). The synergistic effect of this composite structure allows the material to achieve both durability and heat resistance, as polymer (A) provides thermal stability while polymer (B) provides flexibility and toughness.
Solution Approach 2:
The invention optimizes the glass transition temperature parameter of polymer (B) to be 50°C or lower to ensure adequate flexibility and toughness, while relying on polymer (A)'s high softening temperature to maintain overall heat resistance. This parameter optimization strategy resolves the contradiction between durability and heat resistance.
3Reliability
If the refractive index difference between polymer components is minimized to maintain transparency, then optical properties are improved, but the ability to enhance toughness is limited
Solution Approach 1:
The invention sets the refractive index difference between polymer (A) and polymer (B) to 0.014 or less to maintain excellent transparency. Simultaneously, by optimizing other parameters such as the glass transition temperature of polymer (B) and the weight ratio composition, the invention achieves enhanced toughness without compromising optical properties.
Solution Approach 2:
The invention uses a composite material system where polymer (A) provides transparency and heat resistance, while polymer (B) provides flexibility and toughness. The careful selection of materials with matched refractive indices ensures optical clarity, while the complementary properties of the two polymers enable enhanced mechanical durability.
4Temperature
If the softening temperature is increased to improve heat resistance, then thermal stability is improved, but flexibility and toughness are reduced
Solution Approach 1:
The invention combines polymer (A) with high softening temperature (120-300°C) for heat resistance with polymer (B) having low glass transition temperature (50°C or lower) for flexibility. The composite structure allows the material to exhibit both thermal stability and flexibility, as polymer (A) provides heat resistance while polymer (B) provides toughness and flexibility.
Solution Approach 2:
The invention optimizes the softening temperature parameter of polymer (A) to be 120-300°C to ensure adequate heat resistance, while relying on polymer (B)'s low glass transition temperature to provide flexibility and toughness. This parameter optimization strategy resolves the contradiction between heat resistance and flexibility.
Data Source
AI summary
A cyclic olefin polymer composition comprising: [A] a specific cyclic olefin polymer having a softening temperature (TMA) of 120 to 300° C.; and [B] a specific cyclic olefin polymer having a glass transition temperature (Tg) of 50° C. or lower, wherein the absolute value of the difference between nD[A] and nD[B] is 0.014 or less in which nD[B] represents a refractive index of the cyclic olefin polymer [B] and nD[A] represent that of the cyclic olefin polymer [A], and the component [A] is contained in an amount of 50 to 95 parts by weight and the component [B] is contained in an amount of 5 to 50 parts by weight (provided that the total amount of the components [A] and [B] is defined as 100 parts by weight).