Gas Bubble Elimination Technology

Request Number REQ5332785
Due Date February 2, 2017
Request for Proposal Details
RFP Title
Gas Bubble Elimination Technology
RFP Description

NineSigma, representing Covestro, a global leader in high performance polymers, invites proposals for innovative approaches to alleviate CO2 bubbles in moisture-cured polyurethane coatings. These approaches could take the form of new chemistry or additives.


Covestro produces resins for moisture-cured polyurethane (PUR) coatings used in a variety of applications, including for the protection of bridges and other structures. These single component coatings, frequently applied by sprayer or by roller, are currently applied in films up to a maximum of 100 microns dry film thickness to prevent corrosion from damaging the underlying metal structure. Ideally, applications of up to 200 microns dry film thickness are sought.


As these coatings cure, the isocyanates within the PUR react with atmospheric water to create carbon dioxide. The CO2 can remain within the PUR film in the form of bubbles, negatively impacting the physical and mechanical properties, which reduces the corrosion resistance of the coating.


When applying PUR coatings in corners, on complex shapes such as I-beams, or on bridges, it can be difficult to accurately and effectively coat the surface with less than 100 microns dry film thickness of PUR. As the film thickness increases, so does the likelihood of bubble formation and entrapment within the film.


























Figure 1: a lab sample demonstrating the appearance CO2 bubbles


Covestro seeks new approaches to mitigate or eliminate these CO2 bubbles from PUR coatings.


Anticipated Project Phases or Project Plan

Phase 1 – Proof of Concept

Evaluation of proposed technology in an unpigmented resin at 150 – 200 microns dry film thickness cured at 100°F / 80% RH


Phase 2 – Engineering Optimization

Evaluation of proposed technology in a pigmented topcoat resin at 150 – 200 microns dry film thickness cured at 100°F / 80% RH


Criteria for Moving from Phase 1 to Phase 2

Client will consider for advancement an approach that meets performance criteria with acceptable economics and pathway to commercialization.


Key Success Criteria

The successful technology will:

  • Minimize bubble formation in cured PUR films at low and high humidity, without impacting dry film performance:
    • Maintain bulk properties of moisture-cured PUR coating such as weatherability, chemical resistance, pencil hardness, etc.
    • Compatible with film thickness ≥ 200 microns
  • Permit film cure to a hard dry state in < 8 hrs
  • Permit cure at temperatures as low as 32°C
  • Permit development of high gloss film
  • Be delivered as a one-part coating
  • Shelf life > 2 years in a sealed container
    • Preferably, allow for usage and re-sealing of container without impacting stability


Possible Approaches

Possible approaches might include, but are not limited to:

  • Advanced molecular sieves
  • Novel additives or surfactants
  • Chelating agents
  • CO2 scavengers
  • Novel catalysts


Approaches not of interest

The following approaches are not of interest:

  • Technologies that slow the isocyanate/water reaction
  • New application technologies that require significant capital expenditure
  • Two-component coating formulations


Preferred Collaboration types
  • Joint Development
  • Contract Research
  • Technology Licensing
  • Technology Acquisition
  • To Be Negotiated
Items to be submitted

To respond, please make sure you are registered in NineSights, as it will prompt you to log in. Then, use the Response options at the top or bottom of the page. You may submit supplemental files in addition to your completed response form.


Appropriate responses will use the response form and address the following:

  • Non-confidential description of proposed technology and working principle
  • Availability of technical data including
    • Film build to blister thickness
    • Hard dry time
  • Technical maturity of the approach (concept, reduced to practice, prototype, ready to commercialize, ready to implement, commercialized)
  • Pathway to commercial scale including timing, estimated budget, and capacity for manufacture
  • Estimated unit cost of technology
  • Position on intellectual property including patent references
  • Desired relationship with sponsor
  • Team description and related experience


Other Request information includes:



Responses from companies (small to large), academic researchers, other research institutes, consultants, venture capitalists, entrepreneurs, or inventors are welcome. For example:


You represent a company or university that has demonstrated a proof of concept.

You represent a company or university that has reduced method to practice at lab scale.

You represent a company or university that has developed a method for use at pilot scale.

You represent a company or university that has demonstrated a method ready for implementation at industrial scale.

You represent a university research department that has a bench-scale demonstration ready to adapt.

You represent a university research department that has an undeveloped pathway with a high probability of success.



Area of Interest
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