Kevin C Stewart

US Patent:

6916537, Jul 12, 2005

Filed:

Oct 16, 2002

Appl. No.:

10/270657

Inventors:

Cletus N. Welch - Massillon OH, US
Eric M. King - Pittsburgh PA, US
Lawrence G. Anderson - Pittsburgh PA, US
Randy E. Daughenbaugh - Turtle Creek PA, US
Kevin J. Stewart - Murrysville PA, US

Assignee:

Transitions Optical Inc. - Pinellas Park FL

International Classification:

B32B027/36
C08F012/28
C08F018/24
C08F026/02

US Classification:

428412, 526301, 526310, 526314, 351163

Abstract:

Described is a photochromic article that includes a substrate and at least a partial coating of an at least partially cured polymerizable composition of a photochromic amount of at least one photochromic compound, at least one material having at least one carbonate group and at least one hydroxyl group, and at least one monoisocyanate containing material having at least one unsaturated group. Also described are photochromic optical elements such as ophthalmic lenses, prepared from an optical element substrate coated with the photochromic polymerizable composition.

US Patent:

6998072, Feb 14, 2006

Filed:

Oct 16, 2002

Appl. No.:

10/270622

Inventors:

Cletus N. Welch - Massillon OH, US
Eric M. King - Pittsburgh PA, US
Lawrence G. Anderson - Pittsburgh PA, US
Randy E. Daughenbaugh - Turtle Creek PA, US
Kevin J. Stewart - Murrysville PA, US

Assignee:

Transitions Optical, Inc. - Pinellas Park FL

International Classification:

G02B 5/23
G03C 1/00

US Classification:

252586, 359241, 4304951, 430962

Abstract:

Described is a polymerizable composition of a photochromic amount of at least one photochromic compound, at least one material having at least one carbonate group and at least one hydroxyl group, and at least one monoisocyanate containing material having at least one unsaturated group. The polymerizable composition optionally contains copolymerizable monomers. Also described are photochromic polymerizates, e. g. , photochromic optical elements such as ophthalmic lenses, prepared from the polymerizable composition of the present invention.

US Patent:

20070257238, Nov 8, 2007

Filed:

Apr 5, 2007

Appl. No.:

11/696895

Inventors:

Michael Misura - Clinton OH, US
Kevin Stewart - Murrysville PA, US

Assignee:

TRANSITIONS OPTICAL, INC. - Pinellas Park FL

International Classification:

G02B 1/04

US Classification:

252586000

Abstract:

Provided is a method of preparing a photochromic polymeric article including: (a) providing a fluid polymerizable composition of: at least one monomer; a first initiator for inducing polymerization of the monomer at a first temperature; and a second initiator for inducing further polymerization at a second temperature higher than the first temperature; (b) heating the polymerizable composition to at least the first temperature whereby the first initiator induces polymerization of the monomer at the first temperature to produce a polymerizate; (c) heating the polymerizate of (b) to at least the second temperature to further polymerize the polymerizate; and (d) contacting the polymerizate with an organic photochromic substance to incorporate the organic photochromic substance into the polymerizate. Photochromic articles prepared by the method are also provided.