Johannes A Brouwers

Title: Johannes A. Brouwers and His Polymerization Patents.

Introduction

Johannes A. Brouwers was an inventor associated with Stamicarbon B.V. and based in Echt, the Netherlands. His patent work focused on pyrrolidone polymerization and the preparation of poly-2-pyrrolidone suitable for melt spinning. Brouwers is credited with 3 patents.

Latest Patents

One of Brouwers’s patents describes preparing poly-2-pyrrolidone using N-(2-caprolactim)-caprolactam as an accelerator. The invention specifies polymer properties intended to support melt spinning, including a virgin-state relative viscosity between 2.2 and 7.0, limited weight loss during heating, and a minimum relative viscosity after melt spinning. The process polymerizes 2-pyrrolidone with an anionic catalyst at approximately 25°C to 70°C, using the accelerator at 0.05 to 5.0 mole percent relative to the monomer.

Another patent, “Method for Polymerizing Pyrrolidone with Preheating of Catalyst Solution,” concerns improving the consistency of anionic catalysts. It describes heating an alkali metal pyrrolidonate catalyst solution for at least five hours at 100°C to 175°C, without water or air. The catalyst is prepared by reacting an alkali metal hydroxide or alkoxide with excess pyrrolidone and can be used to polymerize pyrrolidone, optionally with up to 25% of another copolymerizable lactam.

Career Highlights

Brouwers’s disclosed inventions address both the properties of the resulting polymer and the reliability of the polymerization process. His work connects catalyst preparation and process conditions with the production of poly-2-pyrrolidone intended for melt spinning.

Collaborations

Brouwers was associated with Stamicarbon B.V. His listed coworkers include Jean M. Warnier and Edmond H. Bour.

Conclusion

Johannes A. Brouwers’s patent contributions center on improving pyrrolidone polymerization and producing melt-spinnable poly-2-pyrrolidone through carefully controlled catalysts, additives, and processing conditions.