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Momentive Performance Materials India Private Limited

Ulsoor , Bengaluru, Karnataka

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Crosslinking And Adhesion Promotion

Engineering crosslinking and adhesion promoting agents for customers as diverse as paint, sealant and master batch manufacturers, Momentive scientists are constantly innovating in these technologies. The result is a portfolio of well-known brands, all of which may extend the service life and functionality of polymer-based products:

  • CoatOSil* silanes include crosslinking grades that may facilitate shelf-stable, non-yellowing performance with improved water resistance and wet adhesion of coating, paint and ink formulations.
  • Silquest* silanes may provide crosslinking of a wide range of organic and inorganic polymers at ambient temperature while utilizing ambient moisture. They can improve thermal stability, creep resistance, hardness and chemical resistance.
  • As adhesion promoters, Silquest silanes may also improve adhesion, especially under hot and humid conditions. They improve adhesion to glass, minerals and metals, and to difficult substrates such as polyamides, SMC, acrylics and PVC.
  • Silcat* silanes can effect superior crosslinking of polyethylene resins in extrusion processes. High crosslinking onset temperature helps to control premature crosslinking in a broad range of processes.
  • XL-PEarl* crosslinking systems, formulated from a peroxide and silane combination, are excellent candidates to consider for the manufacture of master batches based on porous polymer carriers.

Founded on Momentive's unparalleled expertise in crosslinking and adhesion promotion chemistry, our agents continue to provide polymer product makers with new avenues of innovation and advancement.

* CoatOSil, Silquest, Silcat and XL-PEarl are trademarks of Momentive Performance Materials Inc.

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Potential applications for CoatOSil 1770 release coating include:

  • Film liners

* CoatOSil and SilForce are trademarks of Momentive Performance Materials Inc.

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Silcat R industrial silane modifies polyethylene during melt processing (i.e., extrusion) and effects polymer crosslinking upon exposure of the fabricated polyethylene to moisture. This combination of vinylsilane/peroxide and condensation catalyst may be used across many potential applications, including HDPE, MDPE and LLDPE. Widely used in wire and cable insulation as well as PEX-b pipe, Silcat R industrial silane may be found in virtually every home and workplace. It also can be used extensively in heating pipes used in high-end radiant flooring.   

The finished resin resulting from the grafting of Silcat R industrial silane to polyethylene also has the ability to crosslink via a moisture cure process. It has shown both moisture resistance and abrasion resistance in wire and cable jacketing compounds, making it an ideal candidate for many other uses and applications.  

Potential applications for Silcat R industrial silane include:

  • Wire jacketing and low-voltage power cable insulation across many industries
  • Automotive
  • Electrical transmission and distribution
  • Electronics
  • Industrial production and exploration of oil and natural gas
  •  Transportation and aerospace industries  

*Silcat is a trademark of Momentive Performance Materials Inc.

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Silcat RHE Silane

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With its high onset temperature of the silane crosslinking agent, Silcat RHE silane may improve process stability while minimizing pregrafted and crosslinked particles within the insulation layer. Effective with either a nonstabilized polyethylene resin combined with an antioxidant masterbatches, or when used with stabilized cable gear grade resins, Silcat RHE silane produces premium resins that provide outstanding results under certain conditions.  

Potential applications for Silcat RHE silane include:

  • Low- and medium-voltage power cables  

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Silox 23 Silane

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When used in conjunction with a condensation catalyst and antioxidant master batch, Silox 23 silane may boost high grafting efficiency. With its high onset temperature, this silane also may work to ensure good process stability while minimizing pre-grafted and crosslinked particles during extrusion.

This peroxide and silane blend may also be particularly suited to low-odor applications and may be used with a wide range of polyethylene grades, helping to optimize cost-effectiveness. In fact, pipes manufactured using the Monosil one-step process have demonstrated excellent mechanical properties and optimal chemical resistance. When the quality-controlled Monosil system is utilized, application of Silox 23 silane has helped produce pipes with an attractive, and high-quality surface finish.

Potential applications for Silox 23 silane include:

  • Use in the production of high-density polyethylene XL pipes

* Silox is a trademark of Momentive Performance Materials Inc.

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Silquest A-1170 Silane

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Amino bis-silanes such as Silquest A-1170 silane can be effective in reacting with epoxy, urethane, melamine, polyimide, phenolic and furan thermosetting resins, as well as many thermoplastics, such as polyamides and polyesters. Silquest A-1170 silane offers a fast cure time and/or rapid adhesion build. Because of its higher purity grade, Silquest A-1170 silane is an excellent candidate to consider for use in applications that demand low color and greater control of reaction stoichiometry. Silquest A-1170 silane is a versatile silane, and it may be added directly to polymers during system formulation or used independently as a primer.

For key features, typical benefits and physical properties, potential applications, and more, please download the marketing bulletin on this page.

* Silquest is a trademark of Momentive Performance Materials Inc.

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Silquest A-187 Silane

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Working as a trimethoxy silane, Silquest A-187 silane bonds to inorganic substrates to provide excellent wet and dry adhesion along with a rapid hydrolysis rate. Silquest A-187 silane also demonstrates enhanced electrical properties in epoxy-based encapsulants and packaging materials, the result of improved bonding between resin and substrate or filler. Formulated to enhance wet adhesion, Silquest A-187 silane also benefits epoxy encapsulation systems through its enhanced safety of semiconductor or integrated circuits, which it guards from water ingress or surface corrosion.  

This silane is also an excellent candidate for waterborne applications, including acrylic and vinyl-acrylic caulks, as well as urethane and latex caulk applications, where it can improve adhesion to glass and metal substrates.  

Other epoxy applications that may benefit from the addition of Silquest A-187 silane include quartz-filled epoxy encapsulants, pre-mix formulations and sand-filled epoxy concrete patching materials, along with metal-filled epoxy, like those used in mold and dye tools.  

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Silquest A-171 Silane

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A monomeric vinyl functional silane in vinyl acrylic and acrylic resins, Silquest A-171 silane can be added as a monomer during emulsion polymerization to form silane-modified latexes. Functioning as a crosslinker, the silane in these latexes forms very stable Si-O-Si linkages. 

 

Vinyl silanes can also be grafted to specific unsaturated polymers, such as polyethylene, polyester and styrene-butadiene co-polymers, resulting in resins which exhibit silane functionality. The resin can then be crosslinked through an ambient moisture cure mechanism. By crosslinking through this process, higher temperature resistance - along with greater tensile and tear strengths - is achieved for thermoplastic resin-based materials. 

 

The electron-withdrawing effect displayed by the silane's vinyl functionality enhances the rate of hydrolysis. This increased activity makes Silquest A-171 silane one of the quickest hydrolyzing alkoxy silanes on the market. With this elevated rate of hydrolysis, Silquest A-171 silane is an excellent candidate to consider for use as a moisture-scavenging agent in sensitive moisture systems. 

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Silquest A-1871 epoxy silane contains two functional groups with two distinct reactivities: an epoxide capable of reacting with a variety of organic functionalities, as well as alkoxy silane groups that are designed to form a tight bond with many inorganic substrates. This ability to chemically link selected organic resins to inorganic substrates may enhance wet and dry adhesion without the potential for yellowing that is present with amino functional adhesion promoters. With the ability of silanol groups to self-condense, Silquest A-1871 epoxy silane can also be utilized as a crosslinking agent in some resin systems.  

Silquest A-1871 epoxy silane is also reliable for crosslinking waterborne latexes and dispersions such as acrylic, styrene acrylic or other copolymers, plus polyurethane or epoxy dispersions. It provides outstanding chemical resistance and mechanical properties to coatings, adhesives and sealants.  

With its enhanced adhesion to glass and metal substrates in polyurethane resins, Silquest A-1871 epoxy silane helps improve shelf stability over aminosilane alternatives. Electrical properties of epoxy-based electronic encapsulants and packaging materials are also enhanced with Silquest A-1871 epoxy silane by improved bonding between resin and substrate/filler. By improving wet adhesion, the risk of semiconductor or integrated circuit failure is also mitigated by reductions in water ingress and surface corrosion damage.

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Silquest A-2120 Silane

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Silquest A-2120 silane also helps promote excellent adhesion to inorganic substrates, such as metal and glass, and plastics, particularly when combined with SPUR * prepolymer adhesives or sealants. In addition to inorganic and plastic surfaces, Silquest A-2120 silane also can improve adhesion to inorganic fillers or reinforcements for a variety of sealants. As a difunctional silane, it can provide as much as a 35% improvement in elongation and superior stability in waterborne systems over trifunctional amino silanes. With polyamino functionality, Silquest A-2120 silane helps provide a reliable reactive site for amino-reactive resins and offers good wetting of substrates.

It is an excellent candidate to consider for use in RTV silicones and hybrid silane-crosslinked sealants to strengthen adhesion to glass, steel, aluminum and concrete substrates. Silquest A-2120 silane can also enhance adhesion of polysulfide sealants to glass, aluminum and steel. 

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