The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1982
Filed:
Sep. 06, 1977
Anthony Evans, Teaneck, NJ (US);
John M Lesniak, Englishtown, NJ (US);
Franklin Boardman, Englishtown, NJ (US);
Johnson & Johnson, New Brunswick, NJ (US);
Abstract
The instant invention relates to an orthopedic bandage which hardens by means of a free radical catalyzed polymerization reaction, wherein said reaction is initiated by an improved redox catalyst system, and an improved method for forming a cast from said orthopedic bandage. The bandage comprises a flexible carrier having a cast forming composition comprising a monomer (polymerizable by means of said improved redox catalyst system) supported thereon, which monomer may be a solid, water soluble vinyl monomer such as diacetone acrylamide (DAA), N isopropylacrylamide (N-IPA) or mixtures thereof. The improved catalyst system includes a copper salt in combination with a reducing agent such as ferrous sulfate, sodium sulfite, oxalic acid and the like. The preferred copper salt is cupric acetylacetonate. The polymerization of the above monomer may be initiated by contacting the cast forming composition with water, in the presence of said improved redox catalyst system, e.g. by dipping the bandage, including the improved redox catalyst system supported thereon, in tap water. In one embodiment of the invention, the bandage comprises the improved redox catalyst system in combination with the cast forming composition on the flexible carrier. This embodiment shows excellent storage stability, and can be sold as a single package system. Furthermore, the improved redox catalyst system, unlike the prior art redox catalysts used to initiate hardening of orthopedic bandages, provides a uniform rate of hardening even when initiated with tap waters having different impurities.