Synthesis, uses and compositions of crystal hydrogels

Details Synthesis, uses and compositions of crystal hydrogels Synthesis, uses and compositions of crystal hydrogels

2008-03-25

2008-03-25

Wu, David W. (Department: 1713)

Drug, bio-affecting and body treating compositions

Live skin colorant containing

C424S486000, C424S488000, C524S563000, C525S088000

Reexamination Certificate

active

07347988

ABSTRACT:
A method is disclosed for creating hydrogels with ordered crystalline structures that exhibit a characteristic colored opalescence. In addition to the unique optical properties, these materials contain a large amount of water in their crosslinked networks. The manufacturing processes include synthesizing monodispersed hydrogel nanoparticles containing specific reactive functional groups, self-assembly of these particles to form a crystalline structure, and subsequent crosslinking neighboring spheres to stabilize the entire network. Polymerizing a hydrogel monomeric composition around the crystalline structure can enhance the mechanical strength. The resulting network is dimensionally and thermodynamically stabile under various pH and temperature conditions. The color and volume of these crystalline hydrogel networks can reversibly change in response to external stimuli such as temperature, pH and other environmental conditions. These new materials may lead to a variety of technological and artistic applications, ranging from sensors, displays, controlled drug delivery devices, jewelry and decorative consumer products.

REFERENCES:
patent: 4555344 (1985-11-01), Cussler
patent: 4732930 (1988-03-01), Tanaka et al.
patent: 4912032 (1990-03-01), Hoffman et al.
patent: 5062841 (1991-11-01), Siegel
patent: 5100933 (1992-03-01), Tanaka et al.
patent: 5183879 (1993-02-01), Yuasa et al.
patent: 5403893 (1995-04-01), Tanaka et al.
patent: RE35068 (1995-10-01), Tanaka et al.
patent: 5532006 (1996-07-01), Lauterber et al.
patent: 5580929 (1996-12-01), Tanaka et al.
patent: 5654006 (1997-08-01), Fernandez et al.
patent: 5976648 (1999-11-01), Li et al.
patent: 6014246 (2000-01-01), Asher et al.
patent: 6030442 (2000-02-01), Kabra et al.
patent: 6165389 (2000-12-01), Asher et al.
patent: 6187599 (2001-02-01), Asher et al.
patent: 6194073 (2001-02-01), Li et al.
patent: 6350812 (2002-02-01), Vert et al.
patent: 6521431 (2003-02-01), Kiser et al.
patent: 6946086 (2005-09-01), Foulger et al.
patent: 636635 (1995-02-01), None
Hirotsu, et al., “Volume-phase transitions of ionized N-isopropylacrylamide gels,” J. Chem. Phys. 87, 1392-95 (1987).
Hu, et al., “Hydrogel Opals,” Adv. Mater. 13, 1708-12 (2001).
Hu, et al., “A New Route to Crystalline Hydrogels, Guided by a Phase Diagram,” Angew. Chem. Int. Ed. 42, 4799-802 (2003).
Hu, et al., “Polymer Gel Nanoparticle Networks,” Adv. Mater. 12, 1173-76 (2000).
Hu, et al., “Synthesis and Application of Modulated Polymer Gels,” Science 269, 525-27 (1995).
Chen, et al., “Graft copolymers that exhibit temperature-induced phase transitions over a wide range of pH,” Nature 373, 49-52 (1995).
Pusey, et al., “Phase behavior of concentrated suspensions of nearly hard colloidal spheres,” Nature 320, 340-42 (1986).
Senff, et al., “Temperature sensitive microgel suspensions . . . ” J. Chem. Phys. 111, 1705-11 (1999).
Siegel, et al., “pH-Dependent Equilibrium Swelling Properties of Hydrophobic Polyelectrolyte Copolymer Gels,” Macromol. 21, 3254-59 (1988).
Osada, et al., “Intelligent Gels,” Scie. Ame. 268, 82-87 (1993).
Tanaka, “Collapse of Gels and the Critical Endpoint,” Phys. Rev. Lett. 40, 820-23 (1978).
Weissman, “Thermally Switchable Periodicities and Diffraction from Mesoscopically Ordered Materials,” Science 274, 959-60 (1996).

Affiliated with

Also associated with

Rating

Synthesis, uses and compositions of crystal hydrogels does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Synthesis, uses and compositions of crystal hydrogels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synthesis, uses and compositions of crystal hydrogels will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2803980