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Polyester Polyols

Tri-iso distributes a wide range of polyester polyols that allow formulators to produce high quality polyurethanes.  Polyols contain reactive hydroxyl (OH) groups which react with isocyanate (NCO) groups on isocyanates to form polyurethanes. 

Polyester-based polyurethanes enhanced UV resistance, excellent resistance to oils and fuels, and better abrasion resistance and tensile and tear strength compared to polyether-based polyurethanes.  However, polyester-based polyurethanes are more susceptible to hydrolysis and provide poor resistance to weak acids and bases compared to polyether-based polyurethanes.

Your Tri-iso Technical Sales Representative is available to assist you in the selection of the appropriate polyester polyol that will provide the specific properties you are trying to obtain. Click here to request a quote.

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  Product Name  Model   
Castor Oil  First Special Grade Low Moisture
Castor Oil First Special Grade Low Moisture

Castor Oil First Special Grade Low Moisture read more
Castor Oil Low Moisture
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Perstorp Boltorn H2004
Perstorp Boltorn H2004

Dendritic Polyester Polyol for CASE Applications, 6.4 functional, low Tg -35C read more
Boltorn H2004
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Perstorp Boltorn H311
Perstorp Boltorn H311

Dendritic Polyester Polyol for Molded Flexible PU Foams read more
Boltorn H311
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Perstorp Boltorn P1000
Perstorp Boltorn P1000

Dendritic Polyester Polyol as intermediate for Radiation Cured Oligomers read more
Boltorn P1000
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Perstorp CAPA 1301
Perstorp CAPA 1301

CAPA 1301 is a 3000MW monofunctional polycaprolactone, mono functional read more
CAPA 1301
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Perstorp CAPA 2043
Perstorp CAPA 2043

400MW Polycaprolactone polyol diol, initiated with 1,4-BDO read more
CAPA 2043
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Perstorp CAPA 2047A
Perstorp CAPA 2047A

400MW Polycaprolactone polyol diol, initiated with hexanediol (HDO) read more
CAPA 2047A
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Perstorp CAPA 2054
Perstorp CAPA 2054

550MW Polycaprolactone polyol diol, initiated with diethylene glycol (DEG). read more
CAPA 2054
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Perstorp CAPA 2077A
Perstorp CAPA 2077A

CAPA® 2077A is a 750MW Polycaprolactone polyol diol, initiated with hexanediol read more
CAPA 2077A
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Perstorp CAPA 2085
Perstorp CAPA 2085

830MW Polycaprolactone polyol diol, initiated with diethylene glycol (DEG) read more
CAPA 2085
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Perstorp CAPA 2100
Perstorp CAPA 2100

CAPA® 2100 is a 1000MW Polycaprolactone polyol diol, initiated with neopentyl gl read more
CAPA 2100
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Perstorp CAPA 2101A
Perstorp CAPA 2101A

1000MW Polycaprolactone polyol diol, initiated with neopentyl glycol (NEO). read more
CAPA 2101A
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Perstorp CAPA 2121
Perstorp CAPA 2121

1250MW Polycaprolactone polyol diol, initiated with neopentyl glycol (NEO) read more
CAPA 2121
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Perstorp CAPA 2125
Perstorp CAPA 2125

1250MW Polycaprolactone polyol diol initiated with diethylene glycol (DEG) read more
CAPA 2125
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Perstorp CAPA 2125A
Perstorp CAPA 2125A

1250MW Polycaprolactone polyol diol initiated with diethylene glycol (DEG) read more
CAPA 2125A
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Perstorp CAPA 2200
Perstorp CAPA 2200

2000MW Polycaprolactone polyol diol initiated with neopentyl glycol (NEO) read more
CAPA 2200
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Perstorp CAPA 2200A
Perstorp CAPA 2200A

2000MW Polycaprolactone polyol diol initiated with neopentyl glycol (NEO) read more
CAPA 2200A
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Perstorp CAPA 2201
Perstorp CAPA 2201

2000MW Polycaprolactone polyol diol initiated with neopentyl glycol (NEO) read more
CAPA 2201
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Perstorp CAPA 2201A
Perstorp CAPA 2201A

2000MW Polycaprolactone polyol diol initiated with neopentyl glycol (NEO) . read more
CAPA 2201A
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Perstorp CAPA 2202A
Perstorp CAPA 2202A

2000MW Polycaprolactone polyol diol initiated with 1,4-butanediol (BDO) read more
CAPA 2202A
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Polyester polyols are typically formed by the condensation reaction of a glycol with a dicarboxylic acid.  The nature of this reaction results in a relatively high polydispersity (broad molecular weight distribution).  Consequently, standard polyester polyols are typically quite viscous.  However, higher performance polyesters such as polycarprolactones are formed by ring opening of a heterocycle ring (caprolactone monomer) by a glycol initiator.  The nature of this reaction results in a low polydispersity.  Consequently, polycaprolactones have significantly reduced viscosities, enhanced mechanical properties, as well as enhanced low temperature and high temperature performance properties. 

There are several key characteristics which define what performance properties a given polyester polyol will impart in a given polyurethane system.  These characteristics include:  the hydroxyl number or hydroxyl value  (OH value), OH equivalent weight, molecular weight, and the functionality of the polyol.

Hydroxyl number (OH ) is the measure of the hydroxyl group content of gram of polyol.  Hydroxyl value is measured by titrating a known mass of polyol against potassium hydroxide (KOH), and is expressed as mg KOH/g.  Lower hydroxyl values indicates lower hydroxyl content and a higher molecular weight for the overall polyol.

OH equivalent weight is the number of grams of a given product that contains one equivalent of  hydroxyl groups (NCO).  Equivalent weight = 56100/OH

Molecular Weight is determined by multiplying the equivalent weight by the polyol functionality

Polyol functionality refers to the number of OH groups per  molecule.  Increasing the number of OH groups results in greater crosslinking.  Greater crosslinking yields stiffer, harder products with enhanced chemical and thermal resistance.  Polyols that contain 2 hydroxyl groups are called diols, polyols with 3 functional groups are called triols, polyol groups with 4 hydroxyl groups are called tetrols.

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