Kristin E Schroeder

US Patent:

20190153163, May 23, 2019

Filed:

Apr 7, 2017

Appl. No.:

16/091410

Inventors:

- Ludwigshafen am Rhein, DE
Ralph Dieter Maier - White Plains NY, US
Karl Matos - Sewickley PA, US
Kevin M. Neigh - Butler PA, US
Kristin Schroeder - Princeton NJ, US

International Classification:

C08G 75/04
C08K 3/34
C09K 3/10
C09J 181/02
C09J 11/04

Abstract:

A dual-curable sealant composition includes a polysulfide having an —SH group, a metal oxide catalyst, and an alkyl-borane amine catalyst. A cured sealant is also formed from the dual-curable sealant composition. Moreover, a dual-cured sealant is formed that includes the polymerization product of the polysulfide reacted in the presence of the metal oxide catalyst and the alkylborane amine catalyst. Further, a dual-curable sealant system includes a first component including the polysulfide and the alkylborane amine catalyst and a second component including the metal oxide catalyst. An article is formed that includes a substrate and the cured sealant disposed on the substrate. Even further, a method of forming the dual-curable sealant composition includes the steps of providing the polysulfide, the alkylborane amine catalyst, and the metal oxide catalyst, and combining the polysulfide, the alkylborane amine catalyst, and the metal oxide catalyst to form the dual-curable composition.

US Patent:

20150087795, Mar 26, 2015

Filed:

Feb 22, 2013

Appl. No.:

14/379418

Inventors:

- Pittsburgh PA, US
Yungwan Kwak - Breinigsville PA, US
Joanna Burdynska - Pittsburgh PA, US
Andrea Elsen - Pittsburgh PA, US
Kristin Schroeder - Pittsburgh PA, US

International Classification:

B01J 31/22
C08F 120/18

US Classification:

526172, 556150, 526328

Abstract:

A series of ligands with site specific electron donating substituents that form a catalyst complex with a transition metal and are suitable for catalysis of atom transfer radical reactions, including ATRP are described. Faster catalysis rates were observed allowing for low catalyst concentrations and linear increases in molecular weight with monomer conversion, and narrow molecular weight distributions. Cyclic voltammetry revealed that increasing the strength and number of conjugated electron donating groups resulted in more stable complexes and larger ATRP equilibrium constants.