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At Crowley Chemical Company, we are committed to customer service. That's why we are pleased to offer "Feedback," answers to frequently asked questions about our products.

Vycel U in Polyurethane Applications Viplex 19 Rosin Oil MWC-6
Methyl Naphthalene No. 5 Vycel U Vestoplast 891
Polymer C-Syn Vycel P Polytac
Pine Derived Products


FAQs about Vycel U in Polyurethane Applications

Does Vycel U have an equivalent weight?
Vycel U does not have an equivalent weight. There is no hydroxyl or amine content in Vycel U which would be available to react with diisocyanate.
Will Vycel U affect reactivity or pot life of my system?
Vycel U has virtually no affect on the NCO/OH reactivity in TDI, MDI or pMDI based systems. Our laboratory work shows Vycel U will not catalyze or retard typical polyurethane systems.
Does Vycel U have an acid number?
No.
What is the typical moisture content of Vycel U?
Typically it is below 0.03% owing to its strong hydrophobicity.
What is the shelf life of Vycel U in an aromatic diisocyanate?
Vycel U has an excellent long term shelf life when blended directly into typical aromatic diiscocyanates given its similar solubility parameter with these types of diisocyanates. Phase separation is always a function of the particular diisocyanate selected and the amount of Vycel U incorporated. While general recommendations can be made, we recommend the shelf life of a specific formulation to be determined empirically.
Can Vycel U improve water resistance of my polyurethane system?
In most cases, yes, and usually rather significantly. The level of moisture or water resistance is dependent on the amount of Vycel U incorporated. Vycel U actually renders the foam, coating, adhesive, or casting considerably more hydrophobic, so water -- even under pressure -- has a tough time penetrating into the polyurethane's polymer matrix. This, in turn, significantly improves the hydrolysis resistance of the polyurethane system, including those based on polyester polyols prone to hydroysis.
How can I improve compatibility between my aromatic diisocyanate prepolymer chain extended with an EO capped ppg polyether and Vycel U?
Compatibility can be signficantly improved by the incorporation of a small amount of an ethoxylated nonylphenol with approximately 10 ethoxy units. This non-ionic surfactant is particularly effective at improving compatibility of Vycel U with most di and some tri functional polyols. We recommend anywhere from 2-5 pphr based on the weight of the diisocyanate.
Is Vycel U compatible with sucrose based polyols?
Vycel U is compatible with many sucrose based polyols without the need to incorporate a non-ionic surfactant.
If Vycel U does not have an equivalent weight and therefore does not react into the polymer, what keeps it from bleeding out of my system?
Just as rubber processing oils stay tightly bound in tire rubber, Vycel U strongly associates with the aromatic, hard block phase of the polymer's matrix. Vycel U's solubility parameter keeps it strongly locked within the matrix when incorporated below its compatibility threshold. When incorporated above this threshold, it will spill out into the soft block phase of the urethane where it can then bleed to the surface. The bleed or exudate characteristics of Vycel U in a particular system are dependent on three variables: the free volume of the hard block itself, the amount of Vycel U incorporated, and the application's temperature. We recommend the Vycel U compatibility threshold be specifically determined for each individual formulation or system.
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FAQs about Rosin Oil MWC-6

What is Rosin Oil MWC-6?
It is pine-derived and made from dimer acids that have excellent thermal stability and low pour points.
What is its appearance?
It is a dark transparent liquid with low odor.
What is its use?
It is a metal working oil used in formulations of high performance lubricants that require good load carrying ability. When combined with appropriate additives, it makes an excellent base for metal working fluids such as stamping, rolling and drawing oils.
Is it safe to handle?
It is non-carcinogenic and is biodegradable.
Can you supply typical formulations and samples?
Yes. Contact Bill Jennings at 212-682-1200.
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FAQs about Viplex 19

What is Viplex 19?
It is a specially formulated high viscosity oil that is used in asphalt pavement emulsified rejuvenators.
How does Viplex 19-based emulsion improve asphalt pavements?
It seals out moisture and rejuvenates the asphalt to maintain the pavement in near new condition by restoring the asphaltenes and maltenes balance.
Is Viplex 19-based emulsion used in RAP (Reclaimed Asphalt Pavement)?
Yes. The emulsified product is added to the RAP total product mix and serves to restore the physical properties of the asphalt.
Can Viplex 19-based emulsion be applied to new pavements?
Yes. It is applied to new asphalt pavements as a construction seal and significantly extends pavement life.
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FAQs about Methyl Naphthalene No. 5

Where is Methyl Naphthalene No. 5 used?
In naphthalene sulphonate condensate polymers. Also as a dye carrier for polyester fibers. It is also used as an industrial solvent because of its safety and excellent solvent properties.
What is its physical appearance?
It is light colored and has a viscosity at room temperature of about 3 centistokes.
Safety and environmental problems?
It is non-carcinogenic, no HAPs, meets California Proposition 65 and is non-combustible with Flash Point of 215oF.
Whom should I contact for more information about Methyl Naphthalene No. 5?
You may email John Barry. You also may reach John by phone (212-682-1200) or by fax (212-953-3487). Or, if you prefer, simply fill out our data request form.
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FAQs about Vycel U

Why would a polyurethane formulator use Vycel U in his system?
To lower his formulation costs, to reduce viscosity of pMDI systems, to improve hydrolytic stability and to adjust parts A and B for easier mixing.
Compatibility?
Vycel U is compatible with TDI, MDI and pMDI. Also with a wide range of polyols and chain extenders.
Environmental and safety concerns?
It is non-carcinogenic, contains no HAPs, has a flash point above 270oF and meets California Proposition 65.
Whom should I contact for more information about Vycel U?
You may email Chris Mortensen. You also may reach Chris by phone (212-682-1200) or by fax (212-953-3487). Or, if you prefer, simply fill out our data request form.
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FAQs about Vestoplast 891

What is Vestoplast?
Vestoplast is a fully saturated propylene/ethylene/butene 1 polyalphaolefin (APAO). It is supplied in easy to mix pellet form.
What is its use?
It is used in polymer modified asphalt roofing compounds, at about a 25% level mixed with straight run asphalt.
What makes it special?
It has superior UV stability (compared with SBS) and excellent cold flex properties (compared with APP).
How is it used?
It is blended with asphalt using a conventional low speed mixer for about one hour in a typical 22,000 pound batch.
Whom should I contact for more information about Vestoplast 891?
You may email John Barry. You also may reach John by phone (212-682-1200) or by fax (212-953-3487). Or, if you prefer, simply fill out our data request form.
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FAQs about Polymer C-Syn

How does Polymer C-Syn improve wax formulations?
Polymer C-Syn is an invaluable additive where moisture resistance is particularly important, because it enhances MVTR at the creases or folds of fiberboard.
What waxes is it compatible with?
Polymer C-Syn is compatible with paraffin and microcrystalline waxes.
Is it approved as a food packaging adhesive?
Yes. Polymer C-Syn meets FDA Regulation 21 CFR 175.105.
Whom should I contact for more information about Polymer C-Syn?
You may email John Barry or call him at 212-682-1200. Or, if you prefer, simply fill out our data request form.
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FAQs about Vycel P

With Which Resins Is Vycel P Compatible?
Vycel P has been shown to be compatible with four unsaturated polyester resins: DCPD, Orthophthalic, Vinyl Ester, and Isophthalic.
What Are Vycel P's Typical Properties?
Vycel P is hydrophobic, non-reactive, highly aromatic, non-carcinogenic, and meets EPA HAPs standards as well as California Proposition 65. Specific gravity is 0.978. Moisture is 0.02%. Color is light straw. SSU viscosity @ 100oF is 38 seconds. Viscositiy at room temperature is 8 cps. Flash Point is 280oF. Reid vapor pressure is 0.06 psi.
What Test Results Are Available?
Six performance tests are described, including impact resistance, moisture resistance, viscosity, resin wet-out, styrene reduction, and Barcol hardness.
What Other Technical Bulletins Are Available?
You may order technical bulletins that include VOC and Styrene Suppression Emission Data as well as technical data on Vycel P.
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FAQs about PolytacTM

What Are the Distinguishing Characterists of Polytac?
Polytac is a low molecular weight amorphous polypropylene. It has a softening point of about 300oF. Brookfield viscosity @ 375oF is 500-2,500 cps. It is approved as an adhesive for food grade packaging under FDA regulation 21 CFR 175.105.
What Are its major applications?
Polytac is widely used either neat or formulated in hot melt adhesives, sealants, mastics, and potting compounds where advantage can be taken of its relative low cost, its inertness, and low odor. Higher viscosity grades of Polytac are used in polymer modified asphalt roofing membranes.
How is Polytac used in oil and grease formulations?
Its tack enables oil to adhere to fast-moving steel in strip mill operations, burning off without stain. It helps grease adhere to chain drives and open gears.
Does Polytac accept high levels of inorganic fillers?
Yes. It offers unique insulation and acoustical properties to designed items.
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FAQs about Pine Derived Products

Does Crowley Chemical sell any pine derived products?
We offer one pine derived product: Rosin Oil MWC-6 for metal working formulations. SSU viscosity @ 38oC of 2,750 seconds. Acid number 125. Rosin Oil MWC-6 is biodegradable.
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