Thermoplastic rubberlike material is prepared by blending a copolymer of ethylene and vinyl acetate with asphalt and a petroleum distillate. This low cost material is easily molded or extruded and is compatible with a variety of fillers

Hendel, F. J.

English

NASA Technical Reports Server

October 1966	 Brief 66-10453 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information; Springfield, Virginia 22151. 
Thermoplastic Rubberlike Material Produced at Low Cost 
The problem: 
To formulate a thermoplastic rubberlike material 
that can be produced from commercially available 
ingredients at low cost. 
The solution: 
A material prepared by blending a copolymer of 
ethylene and vinyl acetate with asphalt and a petro-
leum distillate. 
How it's done: 
The copolymer, containing 23.8 percent by weight of 
vinyl acetate, is blended with steam-refined asphalt 
(ductility above 150 cm at 77 0 F) and unrefined petro-
leum distillate (0.95 specific gravity) or kerosene (0.79 
specific gravity) at 350 0 F. A typical composition is 
produced by blending 2.7 pounds of the copolymer,. 
with 0.9 pound of asphalt, and 1.5 pounds of the un-
refined petroleum distillate. The cooled blend is a 
thermoplastic material having good tensile strength 
and resilience in the temperature range of —50 0 to 
+ 150°F. At temperatures below —50° F, the material 
becomes very hard but not brittle. 
The material has a glass-transition temperature of 
less than —60 1 F, and a softening point above 150° F.
None of the blended ingredients are exuded at any tem-
perature within the useful temperature range of the 
material. 
Notes: 
1. The new material can be easily molded or extruded 
and is compatible with a variety of fillers. 
2. This low cost material would be useful for lining 
concrete water tanks and swimming pools, and as 
a crack sealant in asphalt and concrete roads, 
especially where low temperature is a problem. 
3. Inquiries concerning this invention may be di-
rected to:
Technology Utilization Officer 
Jet Propulsion Laboratory 
4800 Oak Grove Drive 
Pasadena, California 91103 
Reference: B66-10453 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546.
Source: Frank J. Hendel 
(J PL-793) 
Category 03 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Thermoplastic rubberlike material produced at low cost

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