Stephen M Hobbs

US Patent:

20120234205, Sep 20, 2012

Filed:

Mar 6, 2012

Appl. No.:

13/413143

Inventors:

Stephen J. Hobbs - Gilbert AZ, US
Gregory J. McCollum - Gibsonia PA, US
Juexiao Cai - Stevenson Ranch CA, US
Marfi Ito - Culver City CA, US
Lawrence G. Anderson - Allison Park PA, US
Renhe Lin - Stevenson Ranch CA, US

Assignee:

PRC-DeSoto International, Inc. - Sylmar CA

International Classification:

C09D 5/00
C07D 251/30

US Classification:

10628726, 544221, 544222

Abstract:

Disclosed are multifunctional sulfur-containing polymers that are the reaction products of a sulfur-containing diol, a polyol containing at least three hydroxyl groups per polyol molecule, and an aldehyde, a ketone, or a combination thereof. Sealant compositions comprising the multifunctional sulfur-containing polymers are also disclosed.

US Patent:

20150056397, Feb 26, 2015

Filed:

Nov 4, 2014

Appl. No.:

14/532034

Inventors:

- Sylmar CA, US
Stephen J. Hobbs - Gilbert AZ, US
Marfi Ito - Culver City CA, US
Scott Moravek - Mars PA, US
Renhe Lin - Stevenson Ranch CA, US

International Classification:

C08G 18/52
C08G 18/38
C08G 18/77

US Classification:

428 63, 528 64, 4273855

Abstract:

Sulfur-containing polyurea compositions comprising a polyisocyanate and a polyamine are disclosed. The polyisocyanate comprises the reaction product of reactants comprising a diisocyanate having isocyanate groups with different reactivities toward thiol groups, and a thiol-terminated sulfur-containing polymer such as a thiol-terminated polythioether polymer and/or a thiol-terminated polyformal polymer. The polyamine can be an aromatic polyamine and/or an aromatic amine-terminated polythioether adduct. The sulfur-containing polyurea compositions are useful as aerospace sealants.