By: BIOPLASTIC patents
By: BIOPLASTIC patents Barry Dean, Naperville, Illinois, USA U.S. Patent 10,246,799 (April 2, 2019) “Polylactic Acid Resin Composition For 3D Printing”, Min-young Kim, Jong Ryang Kim, Tae-Young Kim, Sung-wan Jeon, (SK Chemicals Co, Ltd), (Seongnam-si Korea) Ref: WO2016/043440 This patent teaches a composition and a process for making a composition for 3D printing. The composition taught consists of a hard segment polylactic acid (65 – 95 weight %) and a soft segment polyol (5 – 35 weight %) connected via urethane linkages by reaction with a diisocyanate. The PLA hard segment is prepared via reaction of D/L lactide while the soft segment is derived from a polyol such as polyethyleneglycol, polybutyleneglycol or polypropyleneglycol. The hard segment offers a melting point of 170°C and a glass transition of 55°C; while the soft segment glass transition can be tailored by the selection of polyol or mixtures of polyol. The polyol soft segment provides for a greater practical toughness of the resin and hence the 3D printed article. Key to the composition and its use for 3D printing is a practical melt viscosity which is taught based on a measured viscosity of
U.S. Patent 10,351,755 (July 16, 2019) “Loss Circulation Material Composition Having Alkaline Nanoparticle Based Dispersion and Water Insoluble Hydrolysable Polyester”, Vikrant Wagle, Rajendra Kalgaonkar, Abdullah Al-Yami, Zalnab Alsaihati (Saudi Arabian Oil Company), (Dhahran, Saudi Arabia) Ref. WO 2015116044 This patent teaches a composition to address loss of drilling fluids in the wellbore. The composition consists of alkaline nanosilica dispersion and a water insoluble polyester where the ratio of the nanosilica: polyester is 50 – 80:1. The water insoluble polyester can be polylactic acid, polyhydroxyalkanoate, polyglycolide or polycaprolactone, The combined nanosilica and insoluble polyester(powder or fiber) form a gel which when introduced into a well enter subterranean formations of low pressure and/or fractured areas. Under well temperatures the polyester hydrolyzes to form monomeric acid residues which react with the alkaline nanosilica forming a solid, physical barrier to the drilling fluids thereby increasing the efficiency and recovery of the drilling fluids. Process PLA with Improved Molecular Weight Retention LOWER MELT TEMPERATURE REDUCED ENERGY CONSUMPTION HIGHER FILL LEVELS U.S. Patent 10,314,683 (June 11, 2019) “Polyhydroxyalkanoate Medical Textiles and Fibers”, David P Martin, Said Rizk, Ajay Ahuja, Simon F. Williams, (Tepha, Inc), (Lexington, Massachusetts) This patent teaches absorbable polyester fibers, braids and surgical meshes with good in vivo strength retention based on monofilament or multifilament fiber made from poly-4- hydroxybutyrate homopolymer and copolymers. Multifilament fiber tenacity is greater than 3.5 g/denier and monofilament fiber has tensile strength greater than 126 MPa. These strength properties are key for in vivo sutures and surgical meshes These absorbable fibers are suggested to offer improved performance for anti-adhesion properties and reduced risks of infection. This patent also teaches the process for forming useful 4-PHB fiber while overcoming the challenges of melt fracture, low crystallization and fiber tackiness. U.S. Patent 10,351,973 (July 16, 2019) “Process For The Preparation Of A Fiber, A Fiber and A Yarn Made From Such A Fiber”, Jeffrey John Kolstad, Gerardus Johannes Maria Gruter, (Furanix Technologiers B.V.), (Amsterdam, Netherlands) Ref: WO2014/204313 A fiber by melt spinning of polyethylene-2.5- furandicarboxylate is taught. The PEF resin exhibits a solution viscosity of 0.45 – 0.85 dL/g. PEF fiber with draw ratios of 1: 1.4 – 1.6 are shown to exhibit good fiber tenacity 200 – 1000 mN/tex. It is also taught that PEF fiber can be subjected to traditional fiber techniques such as texturing, finishing and dyeing. In a comparative example with poly(trimethylene-2,5- furanoate), PEF was demonstrated to have improved fiber forming properties, e.g. reduced number of spin breaks. The PEF resin can be 100 % renewable with a biobased source of ethylene glycol. FREE white paper on the advantages of processing PLA using Continuous Mixing technology. Request your copy today. The FARREL POMINI Continuous Mixing technology is proven to process PLA at lower melt temperatures than twin screw extruders. These lower melt temperatures translate into improved molecular weight retention, reduced energy consumption and higher throughput rates when compared to other PLA processing techniques. If you are interested in improving your PLA processing, contact a FARREL POMINI representative today or visit farrel-pomini.com/contact to request a copy of our free white paper on PLA production and the advantages of Continuous Mixing technology. farrel-pomini.com | +1 203 736.5500 | Visit us in Hall 9 Stand A24 bioplastics MAGAZINE [03/19] Vol. 14 53
