Optical Brighteners

Optical Brighteners

Optical brighteners, or fluorescent whitening agents, are used to make plastics, fibers, coatings, inks, and detergents appear whiter and brighter.

These products function by absorbing invisible ultraviolet light and re-emitting it as visible light in the blue range of the spectrum.

The absorbance and emission spectra of the optical brightener Benetex OB are outlined on the product data sheets.

  • These products are particularly useful to mask the yellowish cast sometimes observed in plastics and fibers after high temperature processing operations.
  • They are also used in substrates containing pigments or dyes to make colors appear more brilliant.

Benetex® OB

Overview

Benetex OB is a heat resistant, solvent soluble, chemically stable fluorescent whitener that provides brighter looking colors.  It is used to offset the yellowness of a polymer and to yield a whiter appearance.  Optical brighteners create brilliance by absorbing UV light, modifying the wavelength of the light and then emitting the light in a fluorescent fashion.  Benetex OB can also be used as a tracer in various applications and as an optical brightener in thermoplastics, coatings, printing inks, dyes, man-made fibers, waxes, fats, and oils.

Chemistry                       

Chemical Name:         2,2’-(2,5-thiophenediyl)bis(5-tert-butylbenzoxazole)

CAS Number:             7128-64-5

Chemical Structure:  

Benetex® OB

Typical  Properties                   

Product Form:             Solid

Melting Point:              192 - 208°C

        Molecular Weight:       430.6 g/mol

Applications

  • Plastics: Benetex OB is used to impart excellent brightness in plastics, including PVC,
    polyethylene, polypropylene, cellulose acetate, polystyrene, polycarbonate, acrylics, polyurethane,
    linear polyester, and polyamides (nylon).
  • Coatings: – Benetex OB provides an excellent means to determine coverage of either conventional
    or UV cured coatings. Small amounts act as a tracer which, when viewed under a black light,
    indicate whether or not uniform coating coverage has been achieved. This effect is especially
    useful for clear coatings where coverage can be difficult to determine by conventional means.
    Benetex OB can also be used to offset the yellowness of coatings to provide a whiter appearance.
  • Printing Inks: Benetex OB may be used in printing inks to facilitate the quick identification of
    security bonds, and also in bank notes as a safeguard against forgeries. The product may also be
    combined with dyes to produce particularly bright shades, especially pronounced in pastel shades.
    Synthetic fibers – Benetex OB imparts a lightfast brightness with good textile fastness properties to
    PVC and acetate fibers.
  • Adhesives & Sealants: Benetex OB is used to increase whiteness and brightness, and is also
    useful as a tracer to ensure that uniform coverage by the adhesive or sealant has been achieved.

Main applications include fibers, molded articles, films, sheets, clear lacquers, paints, printing inks and synthetic leather.

Advantages

  • Brilliant, bluish white effect that compensates for yellowing
  • Good light fastness and low volatility
  • Exceptional whitening properties
  • Highly compatible with a wide range of organic substrates and solvents
  • Excellent resistance to heat
  • Useful as a tracer in clear coatings, adhesives, and sealants
  • In combination with dyes, produces particularly bright shades
  • FDA cleared for use in all polymers, adhesives, and pressure-sensitive adhesives

Guidelines for Use

Recommended loading concentrations for Benetex OB range between 5 and 10 ppm (0.0005-
0.001%) in unpigmented polyolefins and between 50 and 1000 ppm (0.005-0.1%) in other
substrates. The product can be used alone or in a variety of blends and combinations with other
additives, including antioxidants, processing stabilizers, and light stabilizers. Higher load levels of
Benetex OB are required if it is used in combination with a UV absorber. The exact formulation to
be used is dependent on the substrate, performance requirements, and other factors, and should be
determined by the user based on testing to simulate actual conditions of use. Please contact
Mayzo for specific recommendations.

Storage

This product may be stored up to two years in a sealed container. Containers should be kept tightly
closed when not in use and stored in a cool, dry place.

Safety 

Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

Benetex OB has been cleared for use in adhesives under 21 CFR §175.105, in pressure sensitive
adhesives under 21 CFR §175.125, and in all polymers under 21 CFR §178.3297. Please contact
your Mayzo representative for complete details, including restrictions of use.

Additional Product Details: Please view our Benetex OB PDF

Benetex OB-1

Overview

Benetex OB-1 is a heat resistant and chemically stable fluorescent whitener that increases  whiteness and provides brighter looking colors.  It is used to offset the yellowness of a polymer and to yield a whiter appearance.  Optical brighteners create brilliance by a fluorescence process involving absorption of invisible UV light and emission of visible blue light.  Benetex OB-1 is especially useful in polyester and nylon fibers, as well as in high temperature engineering plastics.

Chemistry

Chemical Name:         2,2’-(1,2-ethenediyl)bis(4,1-phenylene)bisbenzoxazole

        CAS Number:             1533-45-5

Chemical Structure:

Benetex® OB-1 HP

Typical Properties    

Product Form:                 Solid

Melting Point:              >359°C

Molecular Weight:       414.4 g/mol

Applications

Benetex OB-1 HP is recommended to increase the whiteness of polyester and polyamide (nylon)
fibers as well as in high temperature engineering plastics, including polycarbonates, polyesters, and
polyamides (nylon). It is also suitable for use in styrenic and acrylic polymers.

Advantages

  • Brilliant, neutral white cast that compensates for yellowing
  • Low volatility and excellent heat resistant make the product ideal for use in fibers and in
    engineering plastics processed at high temperatures
  • In combination with dyes, produces particularly bright shades
  • Good light fastness
  • FDA cleared for use in all polymers

Guidelines for Use

Recommended loading concentrations for Benetex OB-1 HP range between 50 and 1000 ppm
(0.005-0.1%). The product can be used alone or in a variety of blends and combinations with other
additives, including antioxidants, processing stabilizers, and light stabilizers. Higher load levels of
Benetex OB-1 HP are required if it is used in combination with a UV absorber. The exact
formulation to be used is dependent on the substrate, performance requirements, and other factors,
and should be determined by the user based on testing to simulate actual conditions of use. Please
contact Mayzo for specific recommendations.
Due to the high melting point of the product (359 degrees Celsius), care must be taken to ensure complete dispersion when Benetex OB-1 HP is used in polymers processed at lower temperatures such as styrenics and acrylics.

Storage

This product may be stored up to two years in a sealed container. Containers should be kept tightly
closed when not in use and stored in a cool, dry place.

Safety

Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

Benetex OB-1 HP has been cleared for use in all polymers under 21 CFR §178.3297. Please
contact your Mayzo representative for complete details, including restrictions of use.

Additional Product Details: Please view our Benetex OB-1 PDF

Benetex OB Plus

Overview

Benetex OB Plus is a heat resistant, solvent soluble, chemically stable fluorescent whitener that provides brighter looking colors.  It is used to offset the yellowness of a polymer and to yield a whiter appearance.  Optical brighteners create brilliance by absorbing UV light, modifying the wavelength of the light and then emitting the light in a fluorescent fashion.  Benetex OB Plus can also be used as a tracer in various applications and as an optical brightener in thermoplastics, coatings, printing inks, dyes, man-made fibers, waxes, fats, and oils. This fine powder form is ideally suited for: 1.) screen printing applications where reduced clogging of equipment is critical to increase productivity and 2.) clear-coat applications where efficiency of dispersion and a smooth coating appearance is needed

Chemistry

Chemical Name:         2,2’-(2,5-thiophenediyl)bis(5-tert-butylbenzoxazole)

CAS Number:                         7128-64-5

Chemical Structure:  

  Benetex OB Plus

Typical Properties                    

Product Form :            Solid

Melting Point:              192 - 208°C

Molecular Weight:       431 g/mol

Applications

  • Screen Printing: Benetex OB Plus is recommended in screen-printing applications, where reduced
    clogging of equipment is critical to increase productivity.
  • Coatings: Benetex OB Plus is recommended in clear-coat applications where efficiency of
    dispersion and a smooth coating appearance are required.

Benetex OB Plus can be used in other applications as well, including plastics (PVC, polyethylene,
polypropylene, cellulose acetate, polystyrene, polycarbonate, acrylics, polyurethane, linear
polyester, polyamides), printing inks, coatings, synthetic fibers, adhesives, and sealants. It is also
useful as a tracer in coatings, adhesives, and sealants to ensure uniform coverage has been
achieved.

Advantages

  • Does not require additional milling in coating and ink applications
  • More easily dispersed than other optical brighteners
  • More efficient than other optical brighteners
  • Brilliant, bluish white effect that compensates for yellowing
  • Good light fastness and low volatility
  • Exceptional whitening properties
  • Useful as a tracer in clear coatings, adhesives and sealants
  • In combination with dyes, produces particularly brilliant shades
  • FDA cleared for use in all polymers, adhesives and pressure-sensitive adhesives

Guidelines for Use

Recommended loading concentrations for Benetex OB Plus range between 50 and 1000 ppm
(0.005-0.1%). The product can be used alone or in a variety of blends and combinations with other
additives, including antioxidants, processing stabilizers, and light stabilizers. Higher load levels of
Benetex OB PLUS are required if it is used in combination with a UV absorber. The exact
formulation to be used is dependent on the substrate, performance requirements, and other factors,
and should be determined by the user based on testing to simulate actual conditions of use. Please
contact Mayzo for specific recommendations.

Storage

This product may be stored up to two years in a sealed container. Containers should be kept tightly
closed when not in use and stored in a cool, dry place.

Safety 

Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

Benetex OB PLUS has been cleared for use in adhesives under 21 CFR §175.105, in pressure
sensitive adhesives under 21 CFR §175.125, and in all polymers under 21 CFR §178.3297. Please
contact your Mayzo representative for complete details, including restrictions of use.

Additional Product Details: Please view our Benetex OB Plus PDF

 

Benetex OB-M1

Overview

Benetex OB-M1 is a light fast, chlorine stable, highly soluble fluorescent whitening agent.  It is compatible with conventional and compact detergent powders, liquid detergents, industrial detergents as well as soap bars, softeners, and boosters.  It is effective at relative low loading levels over the whole temperature range from cold to medium washing temperatures.  Optical brighteners create brilliance by absorbing UV light, modifying the wavelength of the light and then emitting the light in a fluorescent fashion.  Benetex OB-M1 can also be used as a tracer in various water systems.

Chemistry                       

Chemical Name:         Derivative of distyryl biphenyl (DSBP) compound

CAS Number:                                 27344-41-8

Chemical Structure:

Benetex OB-M1

Typical Properties

Product Form:                 Solid

Melting Point:              ?

        Molecular Weight:       562.6 g/mol

Applications

Benetex OB-M1 is recommended as a fluorescent whitening agent in a variety of water-based
products and formulations, including conventional and compact detergent powders, liquid
detergents, industrial detergents as well as soap bars, softeners, and boosters. It is effective at
relative low loading levels over the whole temperature range from cold to medium washing
temperatures. It is also useful as a tracer in water systems.

Advantages

  • Improves detergent color and provides a whiter appearance
  • Whiteness delivery: Benetex OB-M1 is stable against bleaching agents such as hypochlorite and peroxide and also to alkali, acids and perspiration
  • Excellent exhaustion rate
  • High solubility in water, even at low temperatures
  • Very good wet and dry light-fastness
  • Good leveling and low spotting FWA

Guidelines for Use

Suggested loading levels for Benetex OB-M1 are provided in the table below. The exact
formulation to be used is dependent on the application, performance requirements, and other
factors, and should be determined by the user based on testing to simulate actual conditions of use.
Please contact Mayzo for specific recommendations.
Conventional detergent powders 0.05 – 0.25%
Compact detergent powders 0.10 – 0.40%
Unstructured liquid detergent 0.05 – 0.40%
Structured liquid detergent 0.05 – 0.15%
Anhydrous liquid detergents 0.10 – 0.40%
Detergent bars 0.05 – 0.15%
Soap bars 0.02 – 0.05%
Industrial detergents 0.20 – 1.00 %
Rinse softeners 0.02 – 0.05 %
Boosters 0.20 – 1.00 %
Creams 0.05 – 0.15 %

Storage

This product may be stored up to two years in a sealed container. Containers should be kept tightly
closed when not in use and stored in a cool, dry place.

Safety

Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

Benetex OB-M1 has not been cleared by the FDA for use in food contact applications.

Additional Product Details: Please view our Benetex OB-M1 PDF