US4705841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
TBEA linked epoxy-urethanes
Assignee: STERNSON Ltd A CORP OF CANADA
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Filing: 1986-03-21
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Granted: 1987-11-10
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Expires: 2006-03-21
Abstract
Abstract Novel epoxy-urethane resins are produced by the reaction of a urethane-alkanolamine adduct with an epoxy resin. The urethane-alkanolamine adduct is prepared by reacting a urethane prepolymer with a sterically hindered N-substituted ethanolamine such as t-butyl ethanolamine. The epoxy-urethane resin can be cured using ordinary epoxy curing agents for application as waterproofing membranes, joint sealants, and adhesives. Two-part resin systems comprising epoxy-urethane resins of the invention as the first part, and an appropriate curing agent as the second part avoid disadvantages characteristic of resin mixtures that rely on urethane cure chemistry.
Inventors
- 👤 Douglas Tosh
- 👤 Michael Flynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:53
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/28; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/83; C08G18/831; C08G59/02; C08G59/10; C08G2190/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A process for making an epoxy-urethane curable with an epoxy curing agent, comprising the steps of (a) reacting a quantity of isocyanate terminated polyurethane prepolymer with tertiary butyl ethanolamine, such that the hydroxyl equivalents of said tertiary butyl ethanolamine are approximately equal to or exceed the isocyanate equivalents on said polyurethane prepolymer to produce a urethane-alkanolamine adduct substantially free of isocyanate functionality, (b) monitoring the infrared absorption of the reaction mixture of step (a) until all of the isocyanate has been consumed, (c) adding to the reaction mixture a quantity of epoxy resin having an epoxide functionality of two or greater in proportion such that the epoxide equivalents are in excess of the amine equivalents of the urethane-alkanolamine adduct.
Claim 2
Dependent Claim
119 words
A process for making an epoxy-urethane curable with an epoxy curing agent, comprising the steps of (a) reacting a quantity of isocyanate terminated polyurethane prepolymer with tertiary butyl ethanolamine, such that the hydroxyl equivalents of said tertiary butyl ethanolamine are approximately equal to or exceed the isocyanate equivalents on said polyurethane prepolymer to produce a urethane-alkanolamine adduct substantially free of isocyanate functionality, (b) monitoring the infrared absorption of the reaction mixture of step (a) until all of the isocyanate has been consumed, (c) adding to the reaction mixture a quantity of epoxy resin having an epoxide functionality of two or greater in proportion such that the epoxide equivalents are in excess of the amine equivalents of the urethane-alkanolamine adduct.
Claim 3
Dependent Claim
48 words
A process according to claim 1, wherein the relative proportions of said epoxy resin and the urethane-alkanolamine adduct are selected so that the epoxide equivalents on said epoxy resin exceed the amine equivalents on said urethane-alkanolamine adduct by a ratio lying in the range of 2.0 to 10.0.
Claim 4
Dependent Claim
22 words
A process according to claim 1 or claim 2, further comprising the step of adding an inert filler to the reaction mixture.
Claim 5
Dependent Claim
22 words
A process according to claim 1 or claim 2, further comprising the step of adding a non-reactive plasticizer to the reaction mixture.
Claim 6
Dependent Claim
171 words
A process for making an epoxy-urethane curable with an epoxy curing agent, comprising the steps of (a) reacting a quantity of isocyanate terminated polyurethane prepolymer with tertiary butyl ethanolamine such that the hydroxyl equivalents of said tertiary butyl ethanolamine are approximately equal to or exceed the isocyanate equivalents on said polyurethane prepolymer to produce a urethane-alkanolamine adduct substantially free of isocyanate functionality, (b) monitoring the infrared absorption of the reaction mixture of step (a) until all of the isocyanate has been consumed, (c) adding to the reaction mixture a quantity of epoxy resin having an epoxide functionality of two or greater in proportion such that the epoxide equivalents are in excess of the amine equivalents of the urethane-alkanolamine adduct, (d) determining the epoxide equivalent weight of said first part, (e) providing a second part comprising approximately one amine equivalent per epoxide equivalent of said first part of an epoxy curing agent, (f) mixing said first and second parts to provide a curable composition, and (g) allowing said curable composition to cure.
Claim 7
Dependent Claim
171 words
A process for making an epoxy-urethane curable with an epoxy curing agent, comprising the steps of (a) reacting a quantity of isocyanate terminated polyurethane prepolymer with tertiary butyl ethanolamine such that the hydroxyl equivalents of said tertiary butyl ethanolamine are approximately equal to or exceed the isocyanate equivalents on said polyurethane prepolymer to produce a urethane-alkanolamine adduct substantially free of isocyanate functionality, (b) monitoring the infrared absorption of the reaction mixture of step (a) until all of the isocyanate has been consumed, (c) adding to the reaction mixture a quantity of epoxy resin having an epoxide functionality of two or greater in proportion such that the epoxide equivalents are in excess of the amine equivalents of the urethane-alkanolamine adduct, (d) determining the epoxide equivalent weight of said first part, (e) providing a second part comprising approximately one amine equivalent per epoxide equivalent of said first part of an epoxy curing agent, (f) mixing said first and second parts to provide a curable composition, and (g) allowing said curable composition to cure.
Claim 8
Dependent Claim
47 words
A process according to claim 5, wherein said proportions of liquid epoxy resin and tertiary butyl ethanolamine are chosen so that the ratio of epoxide equivalents on said epoxy resin to amine equivalents on said tertiary butyl ethanolamine lies in the range of about 2.0 to 10.0.
Claim 9
Dependent Claim
21 words
A process according to claim 5 or 6, further comprising the step of adding an inert filler to said first part.
Claim 10
Dependent Claim
22 words
A process according to claim 5 or claim 6, further comprising the step of adding a non-reactive plasticizer to said first part.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |