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US 6,855,765 B2Granted
Heat and hot water resistant polyurethane sealant
AssigneeNational University of Singapore
InventorsYit Lin Chew, Suat Hong Goh, Xu Zhou
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Abstract
A two-component polyurethane sealant composition is described. The polyurethane sealant of the invention exhibits improved resistance to degradation by heat and hot water. The composition of the invention includes a novel hindered amine antioxidant.
Claims20
A polyurethane sealant composition comprising a component A and a component B, wherein
- component A comprises a hydrophobic polyether diol selected from the group consisting of polybutylene glycol, polytetramethylene ether glycol and a mixture thereof, a cross-linker and an antioxidant of the formula I:
- and component B comprises a polyisocyanate curing agent.
A polyurethane sealant composition comprising a component A and a component B, wherein
- component A comprises
- i) a hydrophobic polyether diol selected from the group consisting of polybutylene glycol, polytetramethylene ether glycol and a mixture thereof, having a number average molecular weight of 2000 to 4000 daltons that is present in an amount of 20 to 60 wt % of component A,
- ii) a cross-linker selected from the group consisting of polypropylene oxide triol having a number average molecular weight of 1000 to 3000, N,N,N′,N′ tetrakis(2-hydroxypropyl)ethylenediamine and a mixture of polypropylene oxide triol having a number average molecular weight of 1000 to 3000 and N,N,N′,N′ tetrakis(2-hydroxypropyl)ethylenediamine, and
- an antioxidant of the formula I:
- and component B comprises a polyisocyanate curing agent.
2 more elements
A polyurethane sealant composition comprising a component A and a component B, wherein
- component A comprises
- i) a hydrophobic polyether diol selected from the group consisting of polybutylene glycol, polytetramethylene ether glycol and a mixture thereof, having a number average molecular weight of 2000 to 4000 daltons that is present in an amount of 20 to 60 wt % of component A,
- ii) a cross-linker selected from the group consisting of polypropylene oxide triol having a number average molecular weight of 1000 to 3000, N,N,N′,N′ tetrakis(2-hydroxypropyl)ethylenediamine and a mixture of polypropylene oxide triol having a number average molecular weight of 1000 to 3000 and N,N,N′,N′ tetrakis(2-hydroxypropyl)ethylenediamine, and
- iii) an antioxidant;
- and component B comprises a polyisocyanate curing agent, wherein the antioxidant comprises a compound of the formula I:
2 more elements
Dependencies are inferred from the claim text.