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Reactive Compounding With Titanates and Zirconates in Thermoplastics


Reactive compounding with titanate and zirconate to affect coupling and catalysis in the polymer melt is discussed. Esters of Ti or Zr couple, or chemically bridge two dissimilar species such as an inorganic filler/organic particulate/fiber and organic polymer via proton coordination. This permits coupling to non-hydroxyl bearing and hereto-fore non-silane reactive inorganic substrates such as CaCO_3 and boron nitride as well as organic substrates such as carbon black and nitramines without the need of water of condensation as with silanes. The thermally stable neopositioned quaternary carbon structure of the neoalkoxy organometallics permits in situ reactions to take place in the thermoplastic melt. In addition, the coupling of monolayers of a phosphato or a pyrophosphato heteroatom titanate or zirconate imparts: synergistic intumescence to non-halogenated flame retardants such as Mg(OH)_2 and ATH; flame retardance function to fillers such as CaCO_3; control of the burn rate and bum rate exponent of aluminum powder rocket fuels; and extinguishment of the flame spread of spalls of polymer bound nitramines used in propellants and explosives. In addition, the organometallic monolayered filler becomes a catalysis support bed for repolymerization of the surrounding polymer phase thus allowing fillers to act as impact strength improvers. Furthermore, the in situ monomolecular deposition of titanate on the surface of a particulate, such as a nano-particulate, renders the particulate hydrophobic and organophilic. Reactive compounding shear conditions in the polymer melt allow the titanate to rid the particle of its air voids and moisture resulting in complete delamination and thus optimization of nano-particulate performance. Also, minor amounts of thermally stable neoalkoxy titanate and zirconate additives provide a means for post reactor, in-situ metallocene-like repolymerization catalysis of an unfilled polymer during the plastication phase. The result is: the creation of metallocene-like (titanocene or zirconocene) behavior such as increased strain strength inducing increased impact toughness and polymer foamability; increased polymer flow at a given temperature; significantly faster thermoplastic processing at lower temperatures; the regeneration of regrind to virgin properties; the diminishment of polymer chain scissoring as constant Ti organometallic catalysis allows re-annealing to slow the rise of melt index under repeat melt processing cycles; lower polymer recrystallization time; and the copolymerization of dissimilar polymers resulting in effects such as the regeneration of curbside recycle waste or the reduction of the wear caused by the rubbing HIPS oh HIPS injection molded parts due to copolymerization of the SBS and PS. New and novel transparent and permanent antistatic agents based on the formation of bipolar layers of dissimilar trineoalkoxy zirconates are shown to be non-blooming, non-moisture dependent providing volume as well as surface ESD effects in any climatic situation for clear thermoplastics and thermosets. The ESD effect is achieved when the Zirconium electron network is formed under intense reactive compounding conditions. Some examples: both 40% CaCO_3 filled and unfilled PP compounds experienced respective reductions of 35.5% and 42% in injection mold cycle time and 22% and 11% in process temperature; 17% 'pyrophosphato titanate coupled conductive carbon black (CB)' in LDPE provides the same Positive Temperature Coefficient effect as 25% untreated CB; a 39.7% reduction in the recrystallization time of PPS; a ten-fold increase in the elongation of a PET/PC regrind alloy; and the regeneration of recycled blends of LDPE and PP regrinds; LOVA (LOw Vulnerability Ammunition) ammunition and other Insensitive Munitions are made possible; solid rocket fuel is made more powerful and accurate. The catalysis effect is shown to be permanent and recyclable. Coupling agent liquid, powder and pellet forms; dosage; dat......

【作者名称】: Salvatore J. Monte
【作者单位】: Kenrich Petrochemicals, Inc. 140 East 22nd Street Bayonne, NJ 07002-0032 USA
【关 键 词】: Reactive Compounding With Titanates and Zirconates in Thermoplastics
【会议名称】: International Conference on Polyolefins Feb 24-26, 2003 Houston, TX
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 101,777,471
【摘要长度】: 4,000
【会议地点】: Houston, TX(US)
【会议组织】: Kenrich Petrochemicals, Inc. 140 East 22nd Street Bayonne, NJ 07002-0032 USA
【会议时间】: 2003
【上篇论文】: 外文会议 - PHYSICS OF THE METAL-CARBON NANOTUBE INTERFACES: CHARGE TRANSFERS, FERMI-LEVEL "PINNING " AND APPLICATION TO THE SCANNING TUNNELING SPECTROSCOPY
【下篇论文】: 外文会议 - Sensitivity Analysis for Dynamic Stability Problems

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