Company Filing History:
Years Active: 2025
Title: Innovations of Punyawat Chupayak in Synthetic Polyisoprene Latex Condoms
Introduction
Punyawat Chupayak is an innovative inventor based in Chonburi, Thailand. He has made significant contributions to the field of materials science, particularly in the development of synthetic polyisoprene latex condoms. His work focuses on enhancing the safety and performance of these products, which are essential for public health.
Latest Patents
Punyawat Chupayak holds a patent for "Synthetic polyisoprene latex condoms with reduced nitrosamine." This invention involves a synthetic polyisoprene latex emulsion that includes both pre-vulcanization and post-vulcanization compositions. The pre-vulcanization composition consists of insoluble amorphous sulfur extracted with a zinc dithiocarbamate catalyst at 20° C. This process forms a sulfur chain that is transported to the interior of the synthetic polyisoprene particle, creating a physical attachment of sulfur to active sites. The degree of pre-vulcanization is verified through a swelling index test, which measures the expansion of a cast and dried film of latex in toluene within 20 minutes. The latex emulsion is then vulcanized at temperatures ranging from 90° C. to 120° C. for 3 to 5 minutes. The post-vulcanization composition, which includes accelerators, crosslinks the synthetic polyisoprene particles, ensuring uniform curing in both inter-particle and intra-particle regions. This results in high cross-link density and a uniform distribution of double bonds, with zinc segregation at the boundaries of the original particles. The final product exhibits high tensile strength, tensile modulus, and elongation, along with excellent tear strength, while releasing below 10 ppb of nitrosamines.
Career Highlights
Punyawat Chupayak is associated with Thai Nippon Rubber Industry Public Company Limited, where he applies his expertise in materials science to develop innovative products. His work has not only advanced the field of latex condom manufacturing but has also contributed to improving safety standards in the industry.
Collaborations
Punyawat has collaborated with notable coworkers, including Pathompong Chupayak and Theeraphol Piachan. Their combined efforts have fostered a creative environment that encourages innovation and the development of high-quality products.