Posts Tagged ‘X-726-0000’

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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Introducing EXOTHANE Elastomers

Wednesday, September 28th, 2011
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EXOTHANE Elastomers

Optimize Photocurable Mechanical Properties

EXOTHANE™ Elastomers represent the most recent advances in Esstech’s urethane chemistry. These versatile materials offer performance enhancements across a broad range of demanding formulations.

  • Exothane 8, low color urethane, creates a “soft” yet tough polymer with high elongation
  • Exothane 26, high flexibility when cured, has the ability to re-adhere at lower tensile strength
  • Exothane 24, high crosslink capacity, low in color and viscosity and very high Shore D hardness
  • Exothane 32, very low in color and viscosity, provides improved flexibility

Like many of Esstech’s other products, potential applications involving EXOTHANE™ Elastomers can vary across many industries from medical devices and nail gel enhancements to radiation-curable coatings.

Contact us directly to discuss your unique requirements and request our EXOTHANE™ Elastomers Product Literature.

Phone: 1-800-245-3800 or 610-521-3800
EMail: techsupport@esstechinc.com.

Esstech products are available to our European customers via, Esschem Europe

(www.esschem-europe.com).



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X-726-0000, Suitable HEMA Replacement

Tuesday, July 5th, 2011
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A new approach in self-etching adhesive formulations: Replacing HEMA for surfactant dimethacrylate monomers

Cesar Henrique Zanchi,, Eliseu Aldrighi Münchow, Fabricio Aulo Ogliari, Rodrigo Varella de Carvalho, Stefano Chersoni, Carlo Prati, Flávio Fernando Demarco, Evandro Piva

Article first published online: 28 JUN 2011.  DOI: 10.1002/jbm.b.31871. © 2011 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2011.

Abstract

This study evaluated the influence of surfactant dimethacrylates (SD) on the resin-to-dentin microtensile bond strength (μTBS) and characterized the interfacial micromorphology of the hybrid layer of the experimental HEMA-free self-etching systems. Five experimental HEMA-free two-step self-etching systems containing different SD (Bis-EMA 10, Bis-EMA 30, PEG 400, PEG 1000, and PEG 400 UDMA [Esstech Code X-726-0000]) and a HEMA-containing system (control) were compared. Each experimental adhesive system was applied and resin composite restorations were incrementally built up in bovine incisors. After 24 h, restored teeth were sectioned to obtain 24 sticks per group. Thereafter, the specimens were subjected to the μTBS test. Data (MPa) were analyzed by One-way ANOVA and Tukey’s test. Adhesive-dentin interfaces were analyzed through Scanning Electron Microscopy (SEM). The adhesive system formulated with PEG 400 UDMA produced μTBS similar to the HEMA-containing group and statistically higher than the HEMA-free groups. Similar failure percentages were observed in the PEG 400 UDMA and the control group. In the SEM analysis, all the adhesive systems presented similar partially demineralized hybrid layer (1.5–3.0 μm thickness) with well-formed resin tags. All SD presented reasonable initial μTBS, with the PEG 400 UDMA being a promising monomer to be considered as a HEMA substitute in adhesive systems compositions.


Link:  http://onlinelibrary.wiley.com/doi/10.1002/jbm.b.31871/full

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Bisphenol A Content

Wednesday, June 2nd, 2010
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BisGMA, bisphenol A-glycidyl methacrylate is a common resin that carries trace amounts of BPA.  Bisphenol A (BPA) carries with it various risks recognized by the National Toxicology Program.

It is possible that high doses of bisphenol A during pregnancy and/or lactation can reduce survival, birth weight, and growth of offspring early in life.  BPA has also been shown to have estrogenic effects. *

According to internal analysis, Esstech’s bisGMA, Product Code X-950-0000, has one of the lowest BPA concentrations in the industry.

BPA Chart

EASE OF FORMULATION

To simplify formulations, X-950-0000 is available in pre-mixed solutions with Triethyleneglycol Dimethacrylate (TEGDMA).

BPA-FREE ALTERNATIVES

Esstech is constantly striving to provide customers with the most up-to-date and novel materials.  The f0llowing are resin “alternatives” that do not contain BPA.

X-850-0000, Urethane Dimethacrylate

  • Cures to create a hard glassy surface
  • Low color values
  • Excellent compatibility with light cure systems

X-726-0000, Extended UDMA

  • Increased flexibility
  • Enhanced fracture toughness

Esstech is constantly striving to provide customers with the most up-to-date and novel materials.  Contact us if you would like to discuss a certain material or to hear what we have in development.

* NTP-CERHR Monograph on the Potential Human Reproductive and Developmental Effects of Bisphenol A.  National Toxicology Program, U.S. Department of Health and Human Services.  NIH Publication No. 08-5994, September 2008.


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X-726-0000 Serves as HEMA Alternative and Improves Degree of Conversion

Wednesday, March 31st, 2010
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Polymerization Shrinkage and Stress Development in Amorphous Calcium Phosphate/Urethane Dimethacrylate Polymeric Composites

J.M. Antonucci, W.F. Regnault, and D. Skrtic

Journal of Composite Materials, Feb 2010; vol. 44: pp. 355 – 367. DOI: 10.1177/0021998309345180

Abstract: This study explores how substituting a new high molecular mass oligomeric poly(ethylene glycol) extended urethane dimethacrylate (UDMA) (PEG-U) for 2-hydroxyethyl methacrylate (HEMA) in photo-activated UDMA resins affects degree of vinyl conversion (DC), polymerization shrinkage (PS), stress development (PSSD) and biaxial flexure strength (BFS) of their amorphous calcium phosphate (ACP) composites. The composites were prepared from four types of resins (UDMA, PEG-U, UDMA/HEMA, and UDMA/PEG-U) and zirconia-hybridized ACP. Introducing PEG-U improved DC, while not adversely affecting PS, PSSD, and the BFS of composites. This improvement in DC is attributed to the long, more flexible structure between the vinyl groups of PEG-U and its higher molecular mass compared to poly(HEMA). The results imply that PEG-U has the potential to serve as an alternative to HEMA in dental and other biomedical applications.

…material research program supported by FDA, NIST, and ADAF. Generous contribution of UDMA, PEG- U, and HEMA monomers from Esstech, Essington, PA, USA, is gratefully acknowledged. Polymerization Shrinkage and Stress in ACP Composites 365 The authors also…

This version was published on February 1, 2010

Link: http://jcm.sagepub.com/cgi/content/abstract/44/3/355


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