Reverse thermal gels as support for rapid prototyping

Details Reverse thermal gels as support for rapid prototyping Reverse thermal gels as support for rapid prototyping

2008-05-06

2008-05-06

Berman, Susan (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

C522S031000, C522S032000, C522S039000, C522S046000, C522S064000, C522S074000, C522S077000, C522S088000, C430S269000

Reexamination Certificate

active

11544624

ABSTRACT:
The present invention relates to novel polymeric compositions that exhibit Reverse Thermal Gelation (RTG) properties for use as Support Materials (SM) in the manufacture of three-dimensional objects. These polymers are Temperature Sensitive Polymers that respond with a significant change of properties to a small change in temperature. Temperature Sensitive Polymers exhibit cloud point (CP) or lower critical solution temperature (LCST) in aqueous solutions. Water-soluble Temperature Sensitive Polymers are chosen to give low viscosity liquid at low temperature when dissolved in water and by that to permit easy dispensing at low temperature. Raising the temperature above their gelation temperature (Tgel) will result in solidification of the composition. At its gel position the material has favorable characteristics as a support and building material. The gel layers have the appropriate toughness and dimensional stability to support the model layers during the building process. After the building process is completed the gel can be cooled down to a temperature below its Tgelso the gel can liquefy and be removed easily by rinsing with water.

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