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Topic: how to lower the hydroxyl value of acrylic polyol  (Read 4293 times)

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Offline lubnashraf

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how to lower the hydroxyl value of acrylic polyol
« on: February 27, 2009, 06:01:56 AM »

 ::)
how to lower the hydroxyl value of solvent base acrylic polyol. OHv remain high if i reduce the amount of hydroxy monomer. i need help frm all of you.
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Offline typhoon2028

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Re: how to lower the hydroxyl value of acrylic polyol
« Reply #1 on: February 27, 2009, 08:04:05 AM »
Can you prereact by stirring in a small amount of isocyanate with tin catalyst?
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Offline gericox

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Re: how to lower the hydroxyl value of acrylic polyol
« Reply #2 on: February 28, 2009, 12:39:58 PM »
or methylation of a part of hydroxy, with diazomethane or BF3/MeOH
or acetylation with acetic anhydride
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