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:
Mar. 16, 1993
Filed:
Jan. 09, 1991
Karl F Mueller, New York, NY (US);
Bernhard Seiferling, Goldbach, DE;
Michael C Bochnik, Yonkers, NY (US);
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
Hard polymers with extremely high oxygen permeability are described, which consist of the copolymerization product of 1-15% by weight of a poly(dimethylsiloxane) bearing multiple polymerizable vinyl groups and having a number-average molecular weight M.sub.n of 1000-7000, 20-50% of an oligosiloxanylalkyl (meth)acrylate, 25-50% of an at least three fluorine atoms containing vinyl-monomer, 0-30% of copolymerizable monomers, which by themselves as homo- or copolymers have a Shore-D hardness of at least 85, 1-25% of polyvinyl-crosslinking monomer of 200-1000 molecular weight, and 0-15% of a watersoluble, copolymerizable monomer. The novel polymers combine a Shore-D hardness of 70-85 with an oxygen permeability of 40-90 barrers, making them outstanding materials for the manufacture and use as rigid, gas-permeable contact lenses.