JAMES ALAN JOHNSON
Engineering in Washington

5596034, Jan 21, 1997

Sep 7, 1995

8/524820

Sivaram Krishnan - Pittsburgh PA
James B. Johnson - Washington PA
Robson Mafoti - Temple TX

Bayer Corporation - Pittsburgh PA

C08K 510, C07C 6700

524308

A thermoplastic molding composition having improved release properties is disclosed. The composition contains a polycarbonate resin and a mold release agent which is an ester conforming structurally to ##STR1## where R is a member selected from the group consisting of glyceryl, trimethylol propyl and pentaerythrityl radicals, m is 2 to 4, R' is a C. sub. 8-20 hydrocarbon radical having a pendant alkyl group, and R" is the esterification residue of a C. sub. 1-24 aliphatic or an aromatic carboxylic acid.

5705546, Jan 6, 1998

Jun 13, 1996

8/662572

Sivaram Krishnan - Pittsburgh PA
James B. Johnson - Washington PA

Bayer Corporation - Pittsburgh PA

C08K 515

524109

A thermoplastic molding composition having improved release properties is disclosed. The composition contains a polycarbonate and an additive amount of an epoxy conforming structurally to ##STR1## where R is a member selected from the group consisting of glyceryl and trimethyl propyl radicals, x is 0 to 20 and R' is a C. sub. 1-4 alkyl radical.

6197853, Mar 6, 2001

Jul 1, 1999

9/346238

Daniel H. Bolton - Beaver Falls PA
Sivaram Krishnan - Pittsburgh PA
David M. Derikart - Natrona Heights PA
James B. Johnson - Washington PA

Bayer Corporation - Pittsburgh PA

C08K 515

524108

A thermoplastic polycarbonate molding composition having improved resistance to gamma radiation-induced yellowing is disclosed. Particularly suitable for the manufacture of devices geared for medical applications, the composition contains an additive amount of a stabilizing compound conforming structurally to ##STR1## where R. sub. 1 denotes a C. sub. 1-30 -alkyl group and R. sub. 2 denotes an aryl radical.

2003014, Jul 31, 2003

Jan 29, 2003

10/353711

Sivaram Krishnan - Ann Arbor MI, US
Robert Pyles - Bethel Park PA, US
Rick Archey - Pleasant Hills PA, US
James Johnson - Washington PA, US

C08L053/00

525/088000

A thermoplastic molding composition comprising a transparent resinous component suitable for tinting by dip-dye method is disclosed. The resinous component is selected from the group consisting of (i) a blend of (co)polycarbonate resin and (co) polycaprolacone, and (ii) a copolymer containing carbonate and caprolactone structural units. The composition, characterized in that it is free of photochromic colorants, may be molded by thermoplastic means, and the molded article is then dipped-dyed by immersion in a tinting solution. The tinted articles are suitable for making, among others, optical lenses.

6103777, Aug 15, 2000

Dec 18, 1998

9/215497

Sivaram Krishnan - Pittsburgh PA
Robert A. Pyles - Bethel Park PA
James B. Johnson - Washington PA

Bayer Corporation - Pittsburgh PA

C08L 6900, C08L 6704, A61K 31135

523105

A thermoplastic molding composition having low haze values, suitable for optical applications is disclosed. The compositions contains a resinous component selected from the group consisting of (i) a homogeneous blend of polycarbonate resin and polycaprolactone and (ii) a copoly(carbonate-lactone) block or random copolymer, and melanin in an amount of 0. 1 to 1. 0 parts per hundred parts of weight of the resinous component.

6065836, May 23, 2000

Jul 30, 1998

9/126405

Sivaram Krishnan - Pittsburgh PA
Robert A. Pyles - Bethel Park PA
James B. Johnson - Washington PA
Timothy J. Pike - Bethel Park PA

Bayer Corporation - Pittsburgh PA

G02C 710

351163

A photochromic ophthalmic lens and a process for its preparation are disclosed. The lens comprise a substantially transparent substrate having a lenticular shape and, at least one film adhering to at least one surface of said substrate. The film contains a resinous blend of polycarbonate resin, and poycaprolactone and an effective amount of a photochromic dye selected from a group consisting of spiropyrans, spiroxazines, fulgides and fulgimides. In an additional embodiment the film contains a copoly(carbonate-lactone) block or random copolymer.

6107375, Aug 22, 2000

Oct 8, 1998

9/168778

Sivaram Krishnan - Pittsburgh PA
James B. Johnson - Washington PA
Donald K. Booher - Bethel Park PA

Bayer Corporation - Pittsburgh PA

C08K 535

524 95

A thermoplastic composition featuring an improved resistance to hydrolysis is disclosed. The composition comprises (i) thermoplastic polycarbonate resin (ii) about 0. 01 to 3 percent of a compound selected from the group consisting of phosphite and phosphonite and (iii) an additive amount of an oligomer or polymer the structure of which features at least one pendant cyclic iminoether group per molecular chain. The additive amount is that which is sufficient to improve the resistance of the polycarbonate resin to hydrolysis.

2002010, Aug 8, 2002

Dec 5, 2000

09/730367

Sivaram Krishnan - Ann Arbor MI, US
Robert Pyles - Bethel Park PA, US
Rick Archey - Pleasant Hills PA, US
James Johnson - Washington PA, US

C08L001/00, C08J003/00, C08L053/00, C08G059/00, C08G063/91, C08G065/32, C08L071/00, C08L067/00, C08G065/00, C08L069/00

525/413000, 525/415000, 528/405000, 528/417000

A thermoplastic molding composition comprising a transparent resinous component suitable for tinting by dip-dye method is disclosed. The resinous component is selected from the group consisting of (i) a blend of (co)polycarbonate resin and (co)polycaprolacone, and (ii) a copolymer containing carbonate and caprolactone structural units. The composition, characterized in that it is free of photochromic colorants, may be molded by thermoplastic means, and the molded article is then dipped-dyed by immersion in a tinting solution. The tinted articles are suitable for making, among others, optical lenses.

5998520, Dec 7, 1999

Jul 2, 1997

8/887075

Sivaram Krishnan - Pittsburgh PA
Robert A. Pyles - Bethel Park PA
James B. Johnson - Washington PA
Michael P. Jenkins - McKeesport PA
Timothy J. Pike - Bethel Park PA

Bayer Corporation - Pittsburgh PA

C08K 515

524110

A thermoplastic molding composition is disclosed comprising (A) at least one resinous component selected from the group consisting of (i) a homogeneous blend of polycarbonate resin and polycaprolactone and (ii) a copoly(carbonate-lactone) copolymer, and (B) at least one compound selected from a group consisting of benzopyrans, naphthopyrans, spirobenzopyrans, spironaphthopyrans, spirobenzoxazines, spironaphthoxazines, fulgides and fulgimides. The composition which contains the photochromic compound at an amount of 0. 01 to 1. 0 parts per hundred parts of weight of said (A) exhibits good photochromic properties.

6069225, May 30, 2000

Mar 17, 1999

9/270860

Michael A. Gerace - Slovan PA
Sivaram Krishnan - Pittsburgh PA
James B. Johnson - Washington PA
Jeff M. Tennant - New Cumberland WV

Bayer Corporation - Pittsburgh PA

C08G 6400

528198

A thermoplastic polycarbonate composition suitable for the preparation of optical storage devices, for instance optical discs, is disclosed. The composition, containing a stabilizing amount of partially fatty acid ester and as a stabilizer, a compound the structure of which contains at least one benzofuran-2-one group per molecule, features improved resistance to yellowing, reduced haze and high total light transmission values.