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:
Apr. 06, 1993
Filed:
Nov. 07, 1991
Christopher D Selvig, Pittsburgh, PA (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
Describes organic resin compositions of from about 30 to 90 weight percent of a polyol(allyl carbonate), e.g., diethylene glycol bis(allyl carbonate), and from about 10 to 70, e.g., 10 to 30, weight percent of a mixture of aliphatic urethanes, the terminal portions of which contain allyl or acrylyl functional groups. Polymerizable compositions prepared from such compositions produce castings which have low yellowness (b*) values and which do not pre-release from the molds in which they are formed. Polymerizates prepared from such compositions may be used to prepare photochromic articles, e.g., lenses, by incorporating a photochromic substance, e.g., by thermal transfer, into the polymerizate.