Donald F Sullivan

Title: **Donald F Sullivan: Innovator in Photopolymer Technology**

Introduction

Donald F Sullivan, a prolific inventor based in King of Prussia, PA, holds an impressive portfolio of 26 patents. His innovative contributions, particularly in the domain of photopolymer technology, have significantly advanced manufacturing processes, especially in printed wiring board (PWB) production.

Latest Patents

One of Sullivan's latest patents is focused on a **double exposure method of photoprinting with liquid photopolymers**. This inventive process replaces traditional light-blocking phototools with a radiation-transparent phototool that uses a photopolymer layer. This approach simplifies and reduces energy in the off-contact photoprinting of patterns on liquid photopolymers, allowing polymerization of specific areas while maintaining controlled radiation energy levels. The technique enables the creation of an in-situ surrogate phototool, facilitating further polymerization across the layer with adjusted radiation energy. Moreover, through this method, the use of different atmospheric conditions—such as inert gas during the first exposure and inhibiting gas during curing—enhances the overall efficiency and effectiveness of developing solder mask layers.

Another notable innovation is in **polymer printing**, where improved adherence and performance are achieved by applying a liquid layer that conforms to uneven substrate surfaces, benefiting the manufacturing of solder masks. This method provides a two-layer composite coating and eliminates the need for vacuum laminators, making the process faster and requiring less equipment. The result is a high-resolution product that offers superior solder mask qualities while ensuring cost-effectiveness.

Career Highlights

Sullivan's career has been marked by continuous innovation and development in the field of photopolymers. His patents exhibit a deep understanding of the intricacies involved in photoprocessing, particularly in enhancing the performance and reliability of printed wiring boards.

Collaborations

Throughout his career, Sullivan has collaborated with various industry players, notably M&T Chemicals, Inc. His work with this company has paved the way for advancements in chemical formulations and applications related to polymer technologies.

Conclusion

Donald F Sullivan's contributions to photopolymer technology represent a significant advancement in manufacturing processes. With a robust patent portfolio and a commitment to innovation, he has set benchmarks in enhancing the efficiency and quality of printed wiring board production. Through his inventive methods, Sullivan continues to inspire future innovations in the field.