How do polycaprolactone polyols differ from the standard adipate polyester polyols?

The polycaprolactone polyols belong to a special class of polyester polyols. Like the standard polyester polyols, the caprolactone polyols in polyurethane elastomers show excellent oil, solvent and fuel resistance, abrasion resistance, high tensile strengths and cut & tear resistance. The caprolactone polyol component of polyurethanes give relatively low glass transition temperatures (Tg ~ - 60°C) to the soft segment. of the polyurethane. In addition, they exhibit enhanced hydrolytic stability; significantly lower viscosities and greater resilience vs. the standard adipate polyester polyols. This is because the polycaprolactone polyols are characterized by a narrow molecular weight distribution and a low fraction of high molecular weight products. The low acid values, < 0.15 mg KOH/g, results from the ring-opening polymerization mechanism of the starting caprolactone monomer; this affords enhanced hydrolytic stability.

What are the key distinguisihing attributes of polycaprolactone based polyurethane elastomers vs. the standard polyesters and PTMEG?

  • Improved hydrolytic stability over polyesters (high temperature and humidity)
  • Very low-neglibile acid values
  • Flexiblity at low temperatures down to < -40°C vs. -20 to -30°C for standard polyesters
  • Excellent dynamic properties and high resiliency
  • Viscosities like PTMEG and much lower than standard polyester polyols

Gantrade can provide references to actual polyurethane performance data.

What grades of polycaprolactone polyols are offered by Gantrade Corporation?

Daicel Chemical is the manufacturer of Gantrade’s caprolactone polyols under the trade name of PLACCEL®. The polycaprolactone polyols are produced by ring opening polymerization of caprolactone monomer using a diol, triol, tetraol or polyol initiator. Daicel Chemical offers a broad product line of polyols from molecular weights of 310 to 4000; hydroxyl numbers from 542 to 28 mg KOH/g. Initiators vary from neopentyl glycol (NPG) to EG, DEG, BDO, TMP and PENTA, etc. DCC would entertain the production of special grades of polycaprolactone polyols for customers.

Special grades of PLACCEL® polycaprolactone polyols include a narrow MW distribution series, a liquid series, a series exhibiting further enhanced hydrolytic stability and polycarbonate diols.

What is Gantrade's value proposition for the polycaprolactone polyols?

Daicel Chemical is a major producer of high quality polycaprolactone polyols, back integrated to the key monomer, caprolactone. They have produced the caprolactone family of products in Japan since 1971 . Daicel has a very broad product line and many unique and innovative products in their polycaprolactone portfolio. Daicel is willing to modify their product offerings and possess strong R&D and pilot facilities to do so. Gantrade markets a complimentary, broad product line of polyols and urethane intermediates. Gantrade offers value in pricing, delivery and service, including technical service.

What is the physical form of the various polycaprolactone polyol grades?

The polycaprolactone polyols vary from liquids at room temperature to pastes or waxes. The low molecular weight grades like PLACCEL®205 (MW 530 diol); PLACCEL® 303 and 305 (MW 310 & 550 triols) and PLACCEL® 410 (MW 1030 tetraol) are liquids. The PLACCEL® L series of liquid caprolactone polyols and PLACCEL E series of high hydrolytic resistant polyols, have molecular weights of 1250 to 2000 and are liquids at room temperature. Depending on the molecular weights, the standard diol waxes have melt points of 30°C up to 58°C for the 4000 MW PLACCEL®240 grade.

What is the shelf life of polycaprolactone polyols?

The shelf life of the polycaprolactone polyols is >1 year when stored in the unopened, original containers and kept at ~ 20ºC.   When opened to the atmosphere, polycaprolactone polyols may absorb some moisture. The caprolactone polyols can also be subject to biodegradation by microorganisms.

What are the handling requirements for polycaprolactone polyols?

The polycaprolactone polyols are non-hazardous, stable products with a low order of toxicity. Gantrade Corporation encourages its customers to have a comprehensive understanding of the health, safety, environmental and regulatory information on its products before handling and disposal. To obtain a Safety Data Sheet (SDS) and other handling information, please contact us using the contact form on www.gantrade.com or call 201-573-1955. Always prevent electrostatic discharge and ensure adequate ventilation in the work and storage areas.