Posts Tagged ‘resins’

Product Spotlight: BHT INHIBITED MONOMERS

Monday, July 30th, 2012
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BHT-INHIBITED MONOMERS

A variety of product applications and foreign regulations have restricted the use of  Hydroquinone (HQ) and 4-Methoxyphenol (MeHQ) as polymerization inhibitors.  In response, Esstech can offer the following products with non-detectable or limited levels of HQ and MeHQ:

The following monomers can be supplied with “non-detectable” levels of HQ and MeHQ as determined by GPC Analysis

  • X-943-7466   Triethyleneglycol Dimethacrylate, 100 ppm BHT
  • X-945-7466   Tetraethyleneglycol Dimethacrylate, 100 ppm BHT
  • X-844-7469  2-Methoxyethoxyethyl methacrylate, 500 ppm BHT
  • X-887-7466  1, 6-Hexandiol Dimethacrylate, 100 ppm BHT
  • X-947-7466  Trimethylolpropane Trimethacrylate, 100 ppm BHT
  • X-850-1066  Urethane Dimethacrylate, 150 ppm BHT
  • X-851-1066   Urethane Dimethacrylate IPDI, 500 ppm BHT

The following monomers can be synthesized with low or non-detectable levels of HQ and MeHQ but, the BHT analog of each is currently not part of Esstech’s commercial product offering.

  • X-726-0000  Exothane 9
  • X-930-0000  Exothane 10
  • X-894-0000   Exothane 32
  • X-846-0000   HEMA Maleate
  • X-821-2000   Methacroyloxyethyl Phthalate (MEP, PAMM)
  • X-753-0000   HEMA Succinate
  • X-865-0000   Pyromellitic Dimethacrylate (PMDM)

 

Email us to request samples or discuss custom synthesis, techsupport@esstechinc.com

 

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Product Spotlight: SILICA CONCENTRATES

Tuesday, July 10th, 2012
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Discussion:

To further assist our customers, Esstech, Inc. now offers “Silica Concentrates”.  Silica, also known as silicon dioxide, is often incorporated into dental and cosmetic formulations creating what are commonly referred to as “filled” systems.  Silicas, specifically, treated-fumed-silicas, are known for their ability to act as rheology modifiers.   Additional benefits of a filled vs. unfilled system include anti-sag application and enhanced strength.  In the rheology curves below (viscosity v. time), you can see the shear thinning effect of silica in a filled system as opposed to that of an un-filled system.  Viscosity is reduced as the shear stress is increased over time.

 

 

Unfortunately, incorporating silica into a formulation is difficult and time consuming.  If the silica is not uniformly dispersed, your formulation will suffer from shifting rheology.  In other words, the rheology of your formulation will change over time as the silica wets-out.

Esstech has the ability to uniformly disperse silica into the monomer (or monomers) of your choosing, creating a customized Silica Concentrate that can be incorporated into your formulation easily.  Contact us today to receive a sample of our Urethane Dimethacrylate-based Silica Concentrate, Product Code X-850-3044.  Or, our chemists can help you choose the best combination of monomers and silica for your formulation.

 

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