Prc De Soto International, Inc.

Marfi Ito

Renhe Lin

Juexiao Cai

Lawrence G Anderson

Gregory J McCollum

Stephen J Hobbs

Steven J Hobbs

Chandra B Rao

Raquel Keledjian

Scott J Moravek

John R Gilmore

Nagarajan Srivatsan

Alfredo Reyes

Sean Manion

Renhe Liln

Gregory J Mccollum

Raquel A Keledjian

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.

Sulfur-containing polyureas and methods of use

Disclosed are polyurea compositions comprising the reaction products of a polyformal-isocyanate prepolymer and a curing agent comprising an amine. The compositions are useful as sealants in aerospace applications.

Polyurea compositions and methods of use

Disclosed are flexible polyamines, flexible amine-terminated polyformal adducts, flexible-amine-terminated polythioether adducts, compositions comprising flexible polyamines and isocyanate-terminated prepolymers, and compositions comprising flexible amine-terminated adducts and isocyanate-terminated prepolymers. Uses of the compositions as sealants, and particularly as aerospace sealants, are also disclosed.

Flexible polyamines, flexible amine-terminated adducts, compositions thereof and methods of use

Low-density compositions and sealants prepared from sulfur-containing prepolymer compositions that exhibit enhanced fuel resistance are disclosed. The low density and enhanced fuel resistance is realized by using polyphenylene sulfide fillers.

Low density fuel resistant sulfur-containing polymer compositions and uses thereof

Compositions useful in aerospace sealant applications comprise sulfur-containing polymers such as polythioethers and polysulfides and are cured using Michael addition reactions. Compositions employing Michael addition curing chemistries include sulfur-containing adducts comprising terminal Michael acceptor groups. In particular, the sulfur-containing adducts include terminal 1-(ethylenesulfonyl)-n-(vinylsulfonyl)alkanol groups.

Michael addition curing chemistries for sulfur-containing polymer compositions employing bis(sulfonyl)alkanols

The use of Michael addition curing chemistries in compositions comprising sulfur-containing polymers such as polythioethers and polysulfides useful in aerospace sealant applications are disclosed. Sulfur-containing adducts comprising terminal Michael acceptor groups are also disclosed.

Michael addition curing chemistries for sulfur-containing polymer compositions

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.

Multifunctional sulfur-containing polymers, compositions thereof and methods of use

Urethane-containing prepolymers formed from diisocyanates and adapted for Michael addition curing chemistries and compositions thereof for use in sealant applications are disclosed. The prepolymers provide compositions that exhibit room temperature stability and a controlled curing rate following a brief activation.

Michael acceptor-terminated urethane-containing fuel resistant prepolymers and compositions thereof

Michael addition curing chemistries in compositions comprising sulfur-containing polymers such as polythioethers and polysulfides are useful in aerospace sealant applications. Compositions employing Michael addition curing chemistries include sulfur-containing adducts comprising terminal Michael acceptor groups. In particular, the sulfur-containing adducts include terminal 1-(ethylenesulfonyl)-n-(vinylsulfonyl)alkanol groups.

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Marfi Ito