Li Yao

Title: Li Yao and Birefringent Polymer Innovation.

Introduction

Li Yao is an inventor associated with Bothell, Washington, and Meta Platforms Technologies, LLC. Yao’s patent work includes an approach to creating optically anisotropic polymer thin films with enhanced birefringence.

Latest Patents

Yao is named on one patent: “Birefringent Polymer Having Bimodal Molecular Weight.” The invention describes a thin film made from a crystallizable polymer and an additive that can interact with the polymer, including through π-π interactions, to encourage polymer-chain alignment and potentially increase crystallinity.

The disclosed polymers include polyethylene naphthalate, polyethylene terephthalate, polybutylene naphthalate, and polybutylene terephthalate, as well as derivatives. Potential additives include aromatic ester oligomers, aromatic amide oligomers, and polycyclic aromatic hydrocarbons. The patent describes a bimodal molecular-weight distribution in which the additive’s molecular weight may be less than approximately 50% of the crystallizable polymer’s molecular weight. Additives may account for up to approximately 10% of the film by weight. The resulting film may have a refractive index greater than approximately 1.7 and in-plane birefringence greater than approximately 0.2.

Career Highlights

Yao’s listed patent reflects work on polymer materials and optical properties. The disclosed design combines a crystallizable polymer with a lower-molecular-weight additive to influence chain alignment and the film’s optical characteristics.

Collaborations

Yao’s listed coworker is Andrew John Ouderkirk. The available information identifies the coworker but does not specify their role in developing the patent.

Conclusion

Li Yao’s patent describes a materials innovation that uses polymer composition and molecular-weight distribution to support highly birefringent optical films.