Oligomer Composition for Low Dielectric PCB Substrates

The patent changes the molecular weight parameter of the oligomer to a specific range (1,000 to 10,000) to achieve low dielectric constant and dissipation factor. This parameter optimization resolves the contradiction by enabling high-frequency signal transmission while maintaining manufacturability through controlled polymerization reactions.

The patent creates a composite material system combining oligomer with specific reactants (Formula I-IV) and crosslinking agents (Formula V-VII). This composite approach achieves both low dielectric properties for signal integrity and compatible manufacturing characteristics through the synergistic combination of multiple components.

The patent optimizes the molecular weight parameter within the specific range of 1,000 to 10,000, which is high enough to provide mechanical strength but low enough to maintain good solubility and processability. This parameter window resolves the contradiction between strength and ease of manufacture.

The patent introduces specific functional groups (Formula I-IV) at local positions within the oligomer structure, which provide crosslinking capability for strength while the overall low molecular weight maintains processability. The local functional groups enable strength without requiring high overall molecular weight.

The patent optimizes the crosslinking density by selecting specific crosslinking agents (Formula V-VII) and controlling their ratio, achieving sufficient mechanical strength while maintaining low dielectric constant and dissipation factor. The parameter optimization prevents excessive crosslinking that would increase dielectric properties.

The patent ensures homogeneous distribution of crosslinking agents throughout the oligomer matrix, creating uniform crosslinking density. This homogeneity allows for optimal balance between mechanical strength and dielectric properties, avoiding localized regions of high crosslinking that would increase dielectric constant.