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US 4,332,329 AGranted
Implosion coatings
AssigneePPG Industries, Inc.
InventorsRoger L. Scriven, Wen-Hsuan Chang
Life of this patent
Estimating the term…
Abstract
An implosion-protected evacuated glass enclosure such as a cathode ray tube or an electric lamp is disclosed. The enclosure is made implosion resistant by depositing on the exterior surface thereof a polyurethane film. The mechanical properties of the polyurethane film result in outstanding glass retention properties when the evacuated glass enclosure implodes.
Claims11
An implosion protected evacuated glass enclosure which comprises in combination:
- (A) a sealed evacuated glass enclosure having exterior and interior surfaces, through at least a portion of said surfaces light is transmitted;
- and
- (B) a transparent, non-tacky, scratch-resistant, polyurethane film on the exposed exterior surface of said glass enclosure having a low degree of adhesion to the exterior surface of said sealed evacuated glass enclosure, said low degree of adhesion being such that said polyurethane film adheres to said glass surface with a 90.degree. peel strength of less than about 20 pounds per lineal inch and the mechanical properties of the polyurethane film are such that when a free film of approximately 1 to 2.5 mils is subjected to tensile testing according to ASTM D-638-72, the film exhibits a tensile strength of from about 1000 to 15,000 pounds per square inch and a corresponding elongation of from about 150 to 1500 percent.
Dependencies are inferred from the claim text.