Our
Organometallic Coupling Agents product line includes Titanate Coupling Agents, Zirconate Coupling Agents and Aluminate Coupling Agents.
Organometallic Coupling Agents are useful in conjunction with mineral-type fillers and flame retardants. Organometallic Coupling Agents chemically bridge two dissimilar species such as an inorganic filler/particulate and organic polymer via proton coordination on non-silane reactive substrates such as CaCO3 and carbon black without the need of water of condensation as with silanes.
Simultaneously, minor amounts of thermally stable neoalkoxy titanate and zirconate additives provide a means for post reactor, in-situ metallocene-like repolymerization catalysis of a filled or unfilled polymer during the plastication phase resulting in: Significantly faster thermoplastic processing at lower temperatures; Lower polymer recrystallization time; And the copolymerization of dissimilar virgin, regrind or recycled polymers.
Organometallic Coupling Agents can be used as a printing ink additive to improve adhesion, heat stability and other resistance properties as well.
| Mechanism |
Coupling Agents are molecular bridges at the interface between two substrates, usually but not limited to an inorganic filler/fiber and an organic polymer matrix. Titanium-derived coupling agents react with free protons at the inorganic interface resulting in the formation of organic-titanium monomolecular layers on the inorganic surface. Additionally, the coupling agent may have up to Six Functions in the matrix-which include polymer catalysis and other heteroatom effects-independent of inorganic content.
Typically, titanate-treated inorganics are hydrophobic, organophilic, and organofunctional. Fillers may be pretreated or treated in situ absent water of condensation and drying techniques as needed with silanes. When used in polymers, titanates can increase adhesion ;improve impact strength and mechanical properties; reduce embrittlement; allow higher filler loadings; optimize particulate dispersion; increase flow of filled and unfilled polymers at lower process temperatures; prevent phase separation; and may have other effects (see "Suggested Functions"). |
| Suitable Substrates |
| The proton reactivity of titanate allows coupling to almost all inorganic and organic substrates such as CaCO3, carbonates, carbon black, graphite, minerals, nano-particulates, silicas, silicates, metals, metal oxides, peroxides, hydrates, acetates, borates, sulfates, nitrates, nitramines, aramid, organic pigments, cellulosics, sulfur, azodicarbonamide, polymers, etc. |
| Suggested Functions |
| Coupling agent, adhesion promoter, catalyst, repolymerization catalyst, copolymerization catalyst, regrind regenerator, polymer strain and mechanical property improver, dispersion aid, deagglomerator, wetting agent, surfactant, grinding aid , plasticizer or solvent reducer, superplasticizer, low temperature flexibilizer, process aid, peptizer, flow control agent, lubricant, viscosity depressant, thixotrope, suspension aid, impact modifier, comonomer, Lewis Acid reducing agent, hydrophobic agent, cure rate modifier, blowing agent activator, intumescent activator, flame retardant, conductivity enhancer, corrosion inhibitor, anti-aging inhibitor, etc. Function depends on dosage, solubility parameters, dilution, sequencing, process conditions, substrate, polymer, other ingredients, curatives, etc. and their interaction with the chemical functionalities of TCA-L12. |
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