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US 8,710,159 B2Granted
Polyfunctional sulfur-containing epoxies and compositions thereof
AssigneePRC-DeSoto International, Inc.
InventorsTimothy Blackford, Juexiao Cai, Raquel Keledjian, Renhe Lin, Jose Luzano, Chandra B. Rao, Bruce Virnelson
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Abstract
Disclosed are polyfunctional sulfur-containing epoxies and compositions containing polyfunctional sulfur-containing epoxies. The polyfunctional sulfur-containing epoxies may be used as a curing agent and combined with polythioethers and/or polysulfides used to provide high elongation sealants useful in aerospace applications.
Claims12
A composition comprising:
- a polyfunctional epoxy comprising the reaction product of reactants comprising:
- (a) a polyfunctional compound having at least three terminal groups reactive with a thiol group;
- (b) a dithiol having the structure of Formula (4):
- HS—R1—SH (4)
- wherein R1 is —[—(CHR3)s—X—]q—(CHR3)r—;
- wherein:
- each R3 is independently selected from hydrogen and methyl;
- each X is independently selected from —O— and —S—;
- s is an integer from 2 to 6;
- q is an integer from 1 to 5;
- and
- r is an integer from 2 to 10;
- and
- (c) allyl glycidyl ether;
- a difunctional epoxide;
- a combination of thiol-terminated polythioethers characterized by an average functionality from 2.05 to 3;
- and
- a low density filler.
15 more elements
Dependencies are inferred from the claim text.