Polybenzoxazine Precursor for Low Permittivity Laminates
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Solution Overview
Problem
Conventional thermosetting resins, such as phenol and melamine resins, suffer from issues like volatile byproduct generation, poor flame retardancy, and high cost, while polybenzoxazines offer improved thermal and electrical properties but require enhancement for specific applications like copper clad laminates requiring low permittivity and high heat resistance.
Innovation Solution
A polybenzoxazine precursor is developed by reacting a phenol novolak resin with an aldehyde compound and allylamine and diaminodiphenylmethane, achieving a weight-average molecular weight of 1500 to 8000 g/mol and a glass transition temperature of 210°C or higher, which is then hardened at 150 to 250°C to form a polymer with enhanced thermal and electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermosetting resins (phenol, melamine) are used, then water resistance and mechanical strength are improved, but volatile byproducts are generated during hardening
Solution Approach 1:
The patent changes the chemical composition parameters by introducing polybenzoxazine as a replacement for conventional phenol and melamine resins. This chemical substitution maintains the desired water resistance and mechanical strength while eliminating the generation of volatile byproducts during the hardening process, as polybenzoxazine undergoes condensation polymerization without volatile emission.
2Ease of operation
If epoxy resins and unsaturated polyester resins are used, then adhesion and flexibility are improved, but flame retardancy deteriorates
Solution Approach 1:
The patent modifies the resin composition by using polybenzoxazine, which inherently possesses flame retardant properties. This chemical parameter change maintains good adhesion and flexibility while significantly improving flame retardancy, as polybenzoxazine forms a protective char layer that prevents combustion and maintains structural integrity at high temperatures.
3Temperature
If bismaleimide resins are used, then heat resistance and electrical properties are improved, but cost deteriorates
Solution Approach 1:
The patent employs polybenzoxazine as a cost-effective alternative to expensive bismaleimide resins. Polybenzoxazine provides comparable heat resistance and electrical properties at a lower cost, making it an economically viable option for industrial applications while maintaining the required thermal and electrical performance.
4Reliability
If polybenzoxazine is used to achieve low permittivity and high heat resistance for copper clad laminates, then electrical and thermal properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary preparation of polybenzoxazine resin with controlled molecular weight and composition before the actual laminate manufacturing process. This pre-preparation step optimizes the resin properties (including permittivity and heat resistance) in advance, simplifying the subsequent manufacturing process and reducing overall complexity by ensuring the resin is ready for direct application without requiring complex in-process adjustments.
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 resulting polybenzoxazine precursor provides improved electrical and thermal characteristics and dimensional stability, making it suitable for use in copper clad laminates, semiconductor encapsulants, printed circuit boards, adhesives, and molds, with reduced permittivity and increased heat resistance.
Implementation Method 1
reacting a phenol novolak resin with an aldehyde compound and allylamine and diaminodiphenylmethane
Implementation Method 2
an oxazine ring is opened by heating and polymerization is performed
Implementation Method 3
hardened at 150 to 250°C to form a polymer with enhanced thermal and electrical characteristics
Data Source
AI summary
This invention relates to a polybenzoxazine precursor and a method of preparing the same, and more particularly, to a polybenzoxazine precursor which includes benzoxazine obtained by reacting a phenol novolak resin with an aldehyde compound and allylamine and diaminodiphenylmethane as an amine compound, and to a method of preparing the same. The polybenzoxazine precursor may serve to prepare a hardened material having excellent thermal and electrical characteristics and dimensional stability. Accordingly, the polybenzoxazine precursor may be available for use in a copper clad laminate, a semiconductor encapsulant, a printed circuit board, an adhesive, a paint, and a mold.