Polyamide Blends of Varying Renewable Content
David A. Ruehle and John R. Dorgan
Summary: A method to produce blended polymers that have different renewable carbon
content and a suite of high performance properties
Description: Polyamides, also known as Nylons, are an important class of engineering
thermoplastics with a variety of applications. With the exception of polyamide-11, polyamides
are typically derived from non-renewable fossil resources. However, this is changing as more
monomers become available from renewable resources. This invention combines 100%
biorenewable polyamide-11 with partially renewable polyamide-6, 10 to create a family of
materials having different renewable carbon content and a suite of high performance
properties. Blends of different types of Nylons is an established art. For example, blends of
aliphatic and aromatic polyamides find application in the automobile industry. Generally, the
scientific and patent literatures suggest that aromatic-aliphatic blends are thermodynamically
miscible, but that aliphatic-aliphatic blends are usually immiscible. The art developed here is
novel, unique, and unexpected due to the finding that the combination of the two aliphatic
polyamides (polyamide-11 and polyamide-610) are found to be thermodynamically miscible.
Main Advantages of this Invention
 Uses a large percentage of renewable material
 The described blends cost less to produce
 Environmental performance is superior to those derived from fossil fuels
Potential Areas of Application
 Manufacture of automotive parts
 Powder coatings
 Piping
 Construction materials
ID number: 13007
Publication: D.A. Ruehle et al. Polymer 2013, 54 6961-6970.
Intel ectual Property Status: US utility patent pending (application #14/448,903)
Opportunity: We are seeking an exclusive or non-exclusive licensee for marketing,
manufacturing, and sale of this technology.
For more information contact:
William Vaughan, Director of Technology Transfer
Colorado School of Mines, 1500 Illinois Street, Guggenheim Hall Suite 314, Golden, CO 80401
Phone: 303-384-2555; e-mail: wvaughan@mines.edu