Low-density bouncing putty

Details Low-density bouncing putty Low-density bouncing putty

1994-02-28

1997-03-04

Dean, Karen A.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524265, 524268, 524379, 524588, 524731, 524766, 524857, 525477, 525478, C08K 529, C08F28312, C08L 8504

Patent

active

056079931

ABSTRACT:
The present invention provides a bouncing putty with low density and other desirable properties. The density is preferably between 0.33 and 0.95 g/cc, preferably between about 0.5 and 0.75 g/cc and particularly preferably about 0.6 g/cc. Borosilicone rubber base is mixed with density-reducing filler, preferably in the form of thermoplastic microspheres. Addition of a thinning agent reduces stiffness and addition of a lubricating oil improves the handling characteristics. A moisture scavenger can be added to maintain the characteristics of the bouncing putty even if some moisture is absorbed during use. A polarity modifier such as glycerine can be added to soften the putty. If desired, a colorant can be added as well.

REFERENCES:
patent: 2431878 (1947-12-01), McGregor et al.
patent: 2541851 (1951-02-01), Wright
patent: 3661790 (1972-05-01), Dean et al.
"Handbook of Fillers and Reinforcements for Plastics", Van Nostrand Reinhold Company, 1978, pp. 312-313.
ExpandCel.RTM. microspheres, Catalog Nobel Industries, Sundsvall, Sweden.
North Coast Medical Company (San Jose, California), 1992 Hand Therapy Catalog pp. 101-103.

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