Polyester Resin Composition Plasticizer Bleeding Resistance
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Solution Overview
Problem
Existing polyester resin compositions for molded articles suffer from insufficient transparency and crystallinity, leading to reduced strength and limited applications due to high acid and hydroxyl values in plasticizers, which cause degradation and bleeding resistance issues.
Innovation Solution
A polyester resin composition incorporating a specific polyester-based plasticizer with a low acid value and hydroxyl value, represented by the formula R1-O-CO-R2-CO[(OR3)mO-CO-R2]n, where R1, R2, and R3 are specific alkyl and alkylene groups, is used, which inhibits degradation and enhances compatibility with the polyester resin, improving transparency, heat resistance, and bleeding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional polyester-based plasticizer with high acid value and hydroxyl value is used, then plasticity and moldability are improved, but transparency and bleeding resistance deteriorate
Solution Approach 1:
The invention changes the chemical parameters of the plasticizer by specifying that the sum of acid value and hydroxyl value must be 40 or less (significantly lower than conventional plasticizers). This parameter change resolves the contradiction by enabling both good moldability and bleeding resistance simultaneously
Solution Approach 2:
The invention uses a composite plasticizer system comprising specific polyester-based plasticizers with controlled molecular structures (terminal capping with monobasic acid and/or monohydric alcohol). This composite approach achieves both plasticity and bleeding resistance that cannot be obtained with conventional single-component plasticizers
2Ease of operation
If a polyester-based plasticizer with high acid value is used, then plasticity is improved, but heat resistance and stability deteriorate
Solution Approach 1:
The invention严格控制 the acid value and hydroxyl value sum to 40 or less, preventing thermal degradation while maintaining plasticity. Conventional plasticizers have much higher values that cause bleeding and heat resistance issues
Solution Approach 2:
The invention converts the potential harm of high reactivity (from acid/hydroxyl groups) into a benefit by carefully controlling these values to be low, thereby achieving both plasticity and thermal stability simultaneously
3Stability of the object's composition
If plasticizer with high reactivity is used, then compatibility with polyester resin is improved, but degradation and bleeding occur
Solution Approach 1:
The invention optimizes the chemical parameters by capping terminal groups with monobasic acid and/or monohydric alcohol, reducing acid value and hydroxyl value sum to 40 or less. This creates optimal compatibility while preventing degradation
Solution Approach 2:
The terminal capping groups (monobasic acid and/or monohydric alcohol) act as intermediaries that provide both compatibility with polyester resin and protection against degradation, resolving the contradiction between reactivity and stability
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 achieves excellent transparency, heat resistance, and bleeding resistance, with improved plasticity and moldability, resulting in high crystallinity and strength, suitable for various applications such as packaging and household items.
Implementation Method 1
the polyester-based plasticizer having a total of acid value and hydroxyl value of 40 or less, is used, the polyester-based plasticizer has excellent compatibility with the polymer
Implementation Method 2
a molded article made of a polyester resin composition which can be suitably used in daily sundries, household electric appliance parts, food containers
Data Source
Figure 1
AI summary
A molded article selected from the group consisting of (1) a sheet or a film, (2) a thermoformed article, (3) a stretched film, wherein the molded article is made of a polyester resin composition containing a polyester resin and a polyester-based plasticizer represented by the following formula (I): R1O-CO-R2-CO-[(OR3)mO-CO-R2-CO-]nOR1 (I), wherein R1 is an alkyl group having from 1 to 4 carbon atoms, R2 is an alkylene group having from 2 to 4 carbon atoms, R3 is an alkylene group having from 2 to 6 carbon atoms, m is the number of from 1 to 6, and n is the number of from 1 to 12, with proviso that all the R2's may be identical or different, and that all the R3's may be identical or different. The molded article of the present invention can be, for example, suitably used, such as a sheet or film for use in various industrial applications in foods, agriculture, and industries, a thermoformed article for use in various applications such as food containers, wrapping materials for daily sundries and household electric appliances, and industrial trays of industrial parts, and a stretched film for use in various applications such as wrapping materials for food wrappings, daily sundries, and household electric appliances, and various industrial films, respectively.