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US 8,618,237 B2Granted
Non-crystallizing bis-oxazolidines
AssigneeSika Technology AG
InventorsKirk Booth, Neil Carter, Ian Martin, Len Daniels
Life of this patent
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Abstract
Non-crystallizing oxazolidines as curing agents for polyisocyanates and polyurethanes. The curing agents are mixtures of at least one polyoxazolidine POU having at least two urethane groups and at least one polyoxazolidine POC having at least one carbonato group.
Claims24
A composition, comprising:
- a) at least one polyoxazolidine POU having at least two urethane groups;
- and
- b) at least one polyoxazolidine POC having at least one carbonato group,
- wherein the polyoxazolidine POU comprises a bis-oxazolidine of formula (IV′)
- wherein R2 and R3 are independently from each other H or a linear or branched alkyl group with 1 to 10 carbon atoms wherein the polyoxazolidines POC comprises a bis-oxazolidine of the formula (V):
- wherein R6 and R7 are independently from each other H or a linear or branched alkyl group with 1 to 10 carbon atoms;
- and wherein the weight ratio of the sum of all polyoxazolidine POC to the sum of all polyoxazolidine POU is 10:90-45:55.
4 more elements
A method of using a composition as a non-crystallizing curing agent of a polyisocyanate, the method comprising adding a composition to a polyisocyanate, wherein the composition comprises:
- a) at least one polyoxazolidine POU having at least two urethane groups;
- and
- b) at least one polyoxazolidine POC having at least one carbonato group,
- wherein the polyoxazolidine POU comprises a bis-oxazolidine of formula (IV′)
- wherein R2 and R3 are independently from each other H or a linear or branched alkyl group with 1 to 10 carbon atoms wherein the polyoxazolidines POC comprises a bis-oxazolidine of the formula (V):
- wherein R6 and R7 are independently from each other H or a linear or branched alkyl group with 1 to 10 carbon atoms;
- and wherein the weight ratio of the sum of all polyoxazolidine POC to the sum of all polyoxazolidine POU is 10:90-45:55.
4 more elements
A composition, consisting essentially of:
- a) at least one polyoxazolidine POU having at least two urethane groups, wherein the at least one polyoxazolidine POU comprises a bis-oxazolidine of formula (IV′)
- wherein R2 and R3 are independently from each other H or a linear or branched alkyl group with 1 to 10 carbon atoms;
- and
- b) at least one polyoxazolidine POC having at least one carbonato group, wherein the at least one polyoxazolidine POC has a monocyclic structure wherein the polyoxazolidine POC comprises a bis-oxazolidine of the formula (V):
- wherein R6 and R7 are independently from each other H or a linear or branched alkyl group with 1 to 10 carbon atoms;
- and wherein the weight ratio of the sum of all polyoxazolidine POC to the sum of all polyoxazolidine POU is 10:90-45:55.
3 more elements
Dependencies are inferred from the claim text.