- technology discovered here
Search Technologies Technology Needs
Browse Technologies
Browse Technology Needs corporate web site
 Tech of the Week
Each week we feature special technologies. Take a moment to view the other Tech of the Week articles, you may find one that meets a present need.
An ultra-compact flotation device based on the same technology as car airbags
Asymmetric triaminophenols useful for polybenzimidazole polymers
Cosmetics with nanosphere dispersions from renewable, environmentally friendly resources
Fluorinated esters of aromatic acids useful for soil and oil resistance of polymers
Lower-cost ethylene-based high viscosity index lubricant technology
New lysinol-epoxy thermoset polymers derived from renewable source
Precise mass spectrometric quantitation of proteins and other biopolymers
Tech of the Week is special. Click View Listing Details to see the full information on this technology -- even if you're not already a member.
To take full advantage of, Become a Member.
 Archive List
Weapon mount system for hunting
Novel solar collector
Inkjet and ink technologies with particular application to printers
Inkjet ink technologies for increased brilliancy, excellent latency, and bleed prevention
Inkjet technologies for printing on special surfaces or with special effects
More articles...
 Tech of the Week

Self-healing Slide-Ring Material paint makes fine scratches disappear on mobile phones, laptops, other surfaces

Nissan Motor Co., Ltd.

Ideal for mobile phone applications, laptop cases, and similar devices that suffer continual minor scratching and abrasion in pocket, backpack, and purse, Slide Ring Material (SRM) paint is able to heal about 80% of surface abrasions by itself, almost immediately. The coating is already commercialized in Japan. The product comprises polymer chains that freely slide through the cross-linked molecules, forming a supramolecular network. When disturbed by minor abrasions, the cross-linked molecules retain mobility and the coating redistributes its tension to “slide” back into place along the polymer chains, erasing the abrasion. Chemically, the coating is an oleophilic polyrotaxane. Its solubility and ability to react with curing agents make it highly applicable to coating resins. In operation, the paint resists cracking and peeling, offers improved elasticity and impact resistance, and is unsusceptible to fouling and adhesion.

Supramolecular network effectively erases abrasions.

Unlike conventional coatings, SRM consists of polymer chains on which slide molecular rings. These rings are the functional and cross-linking sites for the molecules. When the molecules are disturbed (by abrasion, for example) they retain enough mobility that the tension across the cross-linked supramolecular network soon tugs the coating back into place, effectively erasing the abrasion. More extensive abrasions can take a week to self-repair.

Slide-Ring Material (SRM) is particularly useful for coating products that require marring resistance, such as metal surfaces; resinous formed articles; wood products such as stairs, floor, furniture and the like; and similar products and surfaces.

It dramatically improves on the marring qualities of polycarbonate and acrylic plate in such physical properties as hardness, weatherability, stain resistance, and solvent resistance. SRM differs from UV– or EB-curable paints or silica-based paint in that the harder they are, they exhibit inferior adhesion to the substrate and a tendency to crack because of strain during hardening and shrinkage owing to an increased crosslinking density. When softer paints and coatings are used, chipping and cracking does not occur, but the softer coating is also inferior in weatherability and stain resistance.

SRM overcomes these difficulties by using an oleophilic polyrotaxane whose linear molecule and cyclic molecule are provided with hydrophilic modification groups. The linear molecule pierces the cyclic molecule. Blocking groups at both end terminals of the linear molecule prevent the cyclic molecule from leaving. The resulting material is amenable to use as a curable, solvent-based topcoating material that is able to form a film having excellent marring resistance in which cracks form only with great difficulty.

Download this Tech of the Week as a PDF

You can download this Tech of the Week as a PDF file that you can share with co-workers. When viewed on a computer with an Internet connection, the PDF includes live links back to and the technology listing.

Network and bookmark

Twitter Bookmark and Share

Want to see more? Tech of the Week is special. Click View Listing Details to see the full information on this technology -- even if you're not already a member.
Want to know more? will confidentially pass your question along to the provider of this technology and get back to you with an answer if it is available. This service is free. Ask the owner a question
Like an introduction? Deal directly with the licensing contact for this technology. You´ll need to provide some minimal information. This service is confidential and free of charge unless noted. Request an introduction
Send an email to a friend or colleague that contains a link to this technology. Email this listing to a friend
Boston, MA, USA       Liverpool, United Kingdom       Tokyo, Japan                  
Find a Technology |  List a Technology |  Insight |  Using this Site |  About Us |  Home |  Customer Support |  Help
Privacy Statement   |   Terms of Use Agreement   |   Technology Abstracts
Copyright © 1999-2015 by, Inc. All Rights Reserved.