Back to results
US 8,507,617 B2Granted
Polyurea compositions and methods of use
AssigneePRC-DeSoto International, Inc.
InventorsStephen J. Hobbs, Juexiao Cai, Marfi Ito, Renhe Lin
Life of this patent
Estimating the term…
Abstract
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.
Claims21
A composition comprising:
- a polyformal-isocyanate prepolymer comprising the reaction products of reactants comprising a polyformal polyol and a first diisocyanate;
- and
- a curing agent comprising an amine;
- wherein the polyformal polyol comprises a polyformal polyol selected from a polyformal polyol of Formula (4), a polyformal polyol of Formula (5), and a combination thereof:
- wherein:
- w is an integer from 2 to 40;
- z is an integer from 3 to 6;
- each R3 is independently selected from C2-6 alkanediyl;
- each R4 is independently selected from hydrogen, C1-6 alkyl, C7-12 phenylalkyl, substituted C7-12 phenylalkyl, C6-12 cycloalkylalkyl, substituted C6-12 cycloalkylalkyl, C3-12 cycloalkyl, substituted C3-12 cycloalkyl, C6-12 aryl, and substituted C6-12 aryl;
- and
- E represents the core of an m-valent parent polyol E(OH)z.
8 more elements
A composition comprising the reaction products of reactants comprising:
- a polyformal-isocyanate prepolymer comprising the reaction products of a polyformal polyol and a first aliphatic diisocyanate;
- a polythioether-isocyanate prepolymer comprising the reaction products of a polythioether polyol and a second aliphatic diisocyanate;
- and
- an aromatic diamine;
- wherein the polyformal polyol comprises a polyformal polyol selected from a polyformal polyol of Formula (4), a polyformal polyol of Formula (5), and a combination thereof:
- wherein:
- w is an integer from 2 to 40;
- z is an integer from 3 to 6;
- each R3 is independently selected from C2-6 alkanediyl;
- each R4 is independently selected from hydrogen, C1-6 alkyl, C7-12 phenylalkyl, substituted C7-12 phenylalkyl, C6-12 cycloalkylalkyl, substituted C6-12 cycloalkylalkyl, C3-12 cycloalkyl, substituted C3-12 cycloalkyl, C6-12 aryl, and substituted C6-12 aryl;
- and
- E represents the core of an m-valent parent polyol E(OH)z.
9 more elements
Dependencies are inferred from the claim text.