Polycarbonate Resin Composition Using Titanium-Phosphorus Catalyst
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Solution Overview
Problem
Current resin compositions containing aromatic polycarbonate and polyester resins, such as PC/PET alloys, face challenges in achieving both high thermal stability and moist heat resistance, particularly in automotive and OA equipment applications, where weight reduction and integration of complex forms are required, with existing catalysts like germanium and titanium compounds not fully satisfying the needed performance.
Innovation Solution
A resin composition comprising 50 to 99 parts of aromatic polycarbonate resin and 1 to 50 parts of a polyester resin polymerized in the presence of a specific titanium-phosphorus catalyst, which includes a titanium compound reacted with an aromatic polyhydric carboxylic acid and a phosphorus compound, enhancing mechanical strength, flowability, and thermal stability while maintaining good moist heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a germanium catalyst is used to produce polyester resin, then color tone and melt stability are improved, but thermal stability and moist heat resistance are insufficient for automotive applications
Solution Approach 1:
The patent changes the catalyst type from germanium to a specific titanium compound with controlled parameters (Ti content 1-30 ppm, specific chemical structure), achieving both good color tone and superior thermal stability and moist heat resistance simultaneously
Solution Approach 2:
The patent uses a titanium compound that replicates the beneficial effects of germanium catalyst (good color tone, melt stability) while adding superior thermal stability and moist heat resistance properties that germanium lacks
2Illumination intensity
If a titanium-containing catalyst compound is used to improve color tone and thermal stability, then these properties are improved, but moist heat resistance is not sufficiently addressed
Solution Approach 1:
The patent optimizes the titanium compound parameters including Ti content (1-30 ppm), molecular structure (specific formulas with R1-R6 groups), and chemical composition to achieve simultaneous improvement in color tone, thermal stability, and moist heat resistance
Solution Approach 2:
The patent creates a composite catalyst system combining titanium compound with specific organic groups (R1-R6), achieving properties that neither component alone could provide, particularly the combination of good color tone and excellent moist heat resistance
3Illumination intensity
If the amount of polyester resin is increased to improve color tone and thermal stability, then these properties improve, but thermal stability tends to decrease
Solution Approach 1:
The patent changes the approach from adjusting polyester resin amount to optimizing the catalyst (titanium compound) parameters, allowing thermal stability to be maintained or improved while achieving good color tone through catalyst optimization rather than composition adjustment
4Weight of moving object
If part thickness is decreased to reduce weight, then weight reduction is achieved, but heat resistance and moist heat resistance become more difficult to maintain
Solution Approach 1:
The patent changes the material parameters by using polyester resin produced with a specific titanium compound catalyst, which provides superior thermal stability and moist heat resistance, allowing thin-walled parts to maintain adequate heat and moisture resistance despite reduced thickness
5Productivity
If existing titanium compounds are used as polymerization catalyst, then catalytic activity is achieved, but thermal stability and moist heat resistance are not sufficiently improved
Solution Approach 1:
The patent optimizes the titanium compound parameters including Ti content (1-30 ppm), chemical structure (specific formulas with R1-R6 groups), and purity to achieve the right balance between catalytic activity and thermal stability, with the titanium compound providing both good catalysis and superior thermal and moisture resistance
Solution Approach 2:
The patent uses a titanium compound that copies the catalytic function of conventional catalysts while adding superior thermal stability and moist heat resistance properties that conventional titanium compounds lack
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 resin composition exhibits improved mechanical strength, flowability, thermal stability, and moist heat resistance, effectively addressing the limitations of existing materials in weight-reduced, complex-form applications by using a titanium-phosphorus catalyst to produce a polyester resin with enhanced properties.
Implementation Method 1
a polyester resin polymerized in the presence of a titanium-phosphorus catalyst obtained by a reaction between a titanium compound and a phosphorus compound
Data Source
AI summary
The present invention seeks to provide a resin composition which contains an aromatic polycarbonate resin and a polyester resin and which has excellent mechanical strength, flowability and thermal stability and also has excellent moist heat resistance together. The present invention is a resin composition containing 50 to 99 parts by weight of an aromatic polycarbonate resin (component A) and 1 to 50 parts by weight of a polyester resin (component B), the component B being a polyester resin polymerized in the presence of a titanium-phosphorus catalyst obtained by reacting titanium tetrabutoxide, etc., with monolauryl phosphate, etc.