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US4313876A
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Production of isophoronediisocyanate adducts containing free NCO-grops and NCO-groups end blocked with ε-caprolactam
Assignee: Huels AG
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Filing: 1980-07-01
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Granted: 1982-02-02
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Expires: 2000-07-01
Abstract
Abstract Isophoronediisocyanate adducts containing free NCO-groups and NCO-groups end blocked with ε-caprolactam and method for their production.
Inventors
- 👤 Rainer Gras
- 👤 Elmar Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:43
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/792; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8032; C08G18/8041; C08G18/8061; C08G18/807; C08G18/8074; C08G2150/00; C08G2150/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A method for producing isophoronediisocyanate adducts containing free NCO- and NCO-groups end blocked with ε-caprolactam, wherein the isophoronediisocyanate adducts and ε-caprolactam are mixed in such a proportion that 0.1-1 mole of NCO-groups remain free per mole of isophoronediisocyanate adduct wherein said adducts are selected from the group consisting of: trimerized isophoronediisocyanate alone or in a mixture with monomer isophoronediisocyanate and having an NCO-content of 17-35% by weight, isophoronediisocyanate containing urea groups and having an NCO-content of 22-35% by weight, isophoronediisocyanate containing biuret groups and having an NCO-content of 20-35% by weight, isophoronediisocyanate containing carbodiimide groups and having an NCO-content of 22-35% by weight, and an isophoronediisocyanate adduct exhibiting urea and urethane groups of 1-hydroxy-3-aminomethyl-3,5,5-trimethylcyclohexane and isophoronediisocyanate.
Claim 2
Independent Claim
116 words
A method for producing isophoronediisocyanate adducts containing free NCO- and NCO-groups end blocked with ε-caprolactam, wherein the isophoronediisocyanate adducts and ε-caprolactam are mixed in such a proportion that 0.1-1 mole of NCO-groups remain free per mole of isophoronediisocyanate adduct wherein said adducts are selected from the group consisting of: trimerized isophoronediisocyanate alone or in a mixture with monomer isophoronediisocyanate and having an NCO-content of 17-35% by weight, isophoronediisocyanate containing urea groups and having an NCO-content of 22-35% by weight, isophoronediisocyanate containing biuret groups and having an NCO-content of 20-35% by weight, isophoronediisocyanate containing carbodiimide groups and having an NCO-content of 22-35% by weight, and an isophoronediisocyanate adduct exhibiting urea and urethane groups of 1-hydroxy-3-aminomethyl-3,5,5-trimethylcyclohexane and isophoronediisocyanate.
Claim 3
Dependent Claim
28 words
Method according to claim 1, wherein the isophoronediisocyanate adduct comprises trimerized isophoronediisocyanate alone or in a mixture with monomer isophoronediisocyanate and has an NCO-content of 17-35% by weight.
Claim 4
Dependent Claim
21 words
Method according to claim 1, wherein the isophoronediisocyanate adduct comprises isophoronediisocyanate adduct exhibiting urea and urethane groups of 1-hydroxy-3-aminomethyl-3,5,5-trimethylcyclohexane and isophoronediisocyanate.
Claim 5
Dependent Claim
14 words
Adducts containing free NCO-groups and NCO-groups blocked with ε-caprolactam, produced according to claim 1.
Claim 6
Dependent Claim
30 words
The method of claim 1, wherein said ε-caprolactam and said isophoronediisocyanate adducts are mixed in a proportion such that 0.1-0.4 moles of NCO-groups remain free per mole of isophoronediisocyanate adduct.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |