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Forum index » Science and Technology » Chem » Coatings
Orange pigment
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Nicolas DELFAU
science forum beginner


Joined: 27 Jun 2005
Posts: 15

PostPosted: Tue Jan 10, 2006 10:41 am    Post subject: Orange pigment Reply with quote

Dear all,

I'm looking for an orange pigment for an aerosol formulation. Binder :
acrylic. Solvent : ketonics and acetates. Propellant : diethyl ether.
We tried, first, a monoazoic orange 5 that didn't go well in such polar
solvents. After a month @ 50C, it became dark brown.
We've got a pyrazolone orange 13 that behaves better in solvents, but has
low UV resistance.
We also have a benzimidazolone but the price is so huge that we didn't even
try it.

My questions are twofold :
1 - Does anyone know where I can find a list of the chemical nature of
pigment related with their colour index ?
2 - Does someone think of a particular orange pigment, with a strong shade,
near the red, so that we can formulate it to get a RAL 2009 ? ... at a price
lower than 20-30?/kg ?

Thank you in advance.

Nicolas DELFAU
Peintures SOB
FRANCE
Tl : (+33)5.65.38.60.20
e-mail : delfau.nicolas@peintures-sob.fr
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john.spevacek@aspenresear
science forum beginner


Joined: 10 May 2005
Posts: 36

PostPosted: Tue Jan 10, 2006 3:08 pm    Post subject: Re: Orange pigment Reply with quote

1) Pigments are colored because of the long chain conjugations
(alternating double/single bonds) within their molecules. The longer
the conjugation, the longer the absorption wavelength. The bonding
atoms are generally carbon and/or nitrogen in their various
combinations.

2) Don't be too quick to rule out pigments based on price alone, as a
higher coloring power could help reduce the cost of pigment per unit.

Lean on your suppliers heavily for their help with this. Is a
red/yellow combination possible?

John
Aspen Research - www.aspenresearch.com
"Turning Questions into Answers"

Opinions expressed herein are my own and may not represent those of my
employer.
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Uncle Al
science forum Guru


Joined: 24 Mar 2005
Posts: 1226

PostPosted: Tue Jan 10, 2006 11:13 pm    Post subject: Re: Orange pigment Reply with quote

Nicolas DELFAU wrote:
Quote:

Dear all,

I'm looking for an orange pigment for an aerosol formulation. Binder :
acrylic. Solvent : ketonics and acetates. Propellant : diethyl ether.
We tried, first, a monoazoic orange 5 that didn't go well in such polar
solvents. After a month @ 50C, it became dark brown.
We've got a pyrazolone orange 13 that behaves better in solvents, but has
low UV resistance.
We also have a benzimidazolone but the price is so huge that we didn't even
try it.

My questions are twofold :
1 - Does anyone know where I can find a list of the chemical nature of
pigment related with their colour index ?
2 - Does someone think of a particular orange pigment, with a strong shade,
near the red, so that we can formulate it to get a RAL 2009 ? ... at a price
lower than 20-30?/kg ?

Thank you in advance.

"Propellant : diethyl ether."

Really? How does that work?
What about (mixed) inorganic pigments?

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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Me111
science forum beginner


Joined: 08 Apr 2006
Posts: 1

PostPosted: Sat Apr 08, 2006 1:19 am    Post subject: Re: Orange pigment Reply with quote

Try DPP Orange RA from Ciba. Its an organic orange with exceptional
weathering characteristics in masstone strength. Used widely in automotive
applications.
"Nicolas DELFAU" <delfau.nicolas@peintures-sob.fr> wrote in message
news:dq0316$ch$1@s1.news.oleane.net...
Quote:
Dear all,

I'm looking for an orange pigment for an aerosol formulation. Binder :
acrylic. Solvent : ketonics and acetates. Propellant : diethyl ether.
We tried, first, a monoazoic orange 5 that didn't go well in such polar
solvents. After a month @ 50C, it became dark brown.
We've got a pyrazolone orange 13 that behaves better in solvents, but has
low UV resistance.
We also have a benzimidazolone but the price is so huge that we didn't
even try it.

My questions are twofold :
1 - Does anyone know where I can find a list of the chemical nature of
pigment related with their colour index ?
2 - Does someone think of a particular orange pigment, with a strong
shade, near the red, so that we can formulate it to get a RAL 2009 ? ...
at a price lower than 20-30?/kg ?

Thank you in advance.

Nicolas DELFAU
Peintures SOB
FRANCE
Tl : (+33)5.65.38.60.20
e-mail : delfau.nicolas@peintures-sob.fr

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Google

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