Patent US4814103A successfully refreshed from Google Patents.
US4814103A
Expired / Lapsed
US
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Color stable urethane prepolymer
Assignee: Bayer Corp
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Filing: 1988-02-18
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Granted: 1989-03-21
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Expires: 2008-02-18
Abstract
Abstract The present invention is directed to the stabilization of a prepolymer based on methylene diphenyl isocyanate rich in the 2,4'-isomer. It was surprisingly found that the color stability, viscosity and aging characteristics of the prepolymer are improved markedly upon the incorporation therewith of a combination of a certain epoxide compound and a hindered phenol.
Inventors
- 👤 Terry A. Potter
- 👤 Richard S. Pantone
- 👤 Russell P. Carter, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:12
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671; C08K5/15; C08K5/151; C08K5/1515
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
A prepolymer based on a methylene diphenyl isocyanate mixture which is rich in the 2,4'-isomer comprising a color stabilizing amount of a cycloaliphatic epoxide compound and a hindered phenol said mixture containing about 20-90 wt. % of the 4,4'-isomer, 10-70 wt. % of the 2,4'-isomer and 0-10 wt. % of the 2,2'-isomer said prepolymer being the product of reacting said mixture with a compound which contains an isocyanate reactive group.
Claim 2
Dependent Claim
70 words
A prepolymer based on a methylene diphenyl isocyanate mixture which is rich in the 2,4'-isomer comprising a color stabilizing amount of a cycloaliphatic epoxide compound and a hindered phenol said mixture containing about 20-90 wt. % of the 4,4'-isomer, 10-70 wt. % of the 2,4'-isomer and 0-10 wt. % of the 2,2'-isomer said prepolymer being the product of reacting said mixture with a compound which contains an isocyanate reactive group.
Claim 3
Dependent Claim
19 words
The prepolymer of claim 1 wherein said epoxide compound has an epoxide equivalent weight of about 44 to 400.
Claim 4
Dependent Claim
43 words
The prepolymer of claim 1 wherein said hindered phenol is present at an amount of 0.04 to about 0.5% and wherein said epoxide compound is present at an amount of 0.05 to about 1% based on the weight of said isocyanate or prepolymer.
Claim 5
Dependent Claim
88 words
A process for stabilizing a methylene diphenyl isocyanate based prepolymer comprising (i) adding to a mixture of methylene diphenyl isocyanates about 0.04 to 0.5 wt. % of a hindered phenol and (ii) adding about 0.05 to 1 wt. % of a cycloaliphatic epoxide compound to said mixture wherein said mixture contains 20-90 wt. % of the 4,4'-isomer, 10-70 wt. % of the 2,4'-isomer and 0-10 wt. % of the 2,2'-isomer said prepolymer being the product of reacting said mixture with a compound which contains an isocyanate reactive group.
Claim 6
Dependent Claim
88 words
A process for stabilizing a methylene diphenyl isocyanate based prepolymer comprising (i) adding to a mixture of methylene diphenyl isocyanates about 0.04 to 0.5 wt. % of a hindered phenol and (ii) adding about 0.05 to 1 wt. % of a cycloaliphatic epoxide compound to said mixture wherein said mixture contains 20-90 wt. % of the 4,4'-isomer, 10-70 wt. % of the 2,4'-isomer and 0-10 wt. % of the 2,2'-isomer said prepolymer being the product of reacting said mixture with a compound which contains an isocyanate reactive group.
Claim 7
Dependent Claim
43 words
The process of claim 4 wherein said hindered phenol conforms to ##STR6## wherein R 1 , R 2 and R 5 are hydrogen atoms or an alkyl group and R 3 and R 4 are alkyl groups having at least three carbon atoms.
Claim 8
Dependent Claim
12 words
The process of claim 4 wherein said hindered phenol conforms to ##STR7##
Claim 9
Dependent Claim
19 words
The process of claim 4 wherein said epoxide compound has an epoxide equivalent weight of about 44 to 400.
Claim 10
Dependent Claim
72 words
A prepolymer based on methylene diphenyl isocyanate mixture which is rich in the 2,4'-isomer comprising a color stabilizing amount of a cycloaliphatic epoxide compound conforming to ##STR8## and a hindered phenol said mixture containing about 20-90 wt. % of the 4,4'-isomer, 10-70 wt. % of the 2,4'-isomer and 0-10 wt. % of the 2,2'-isomer said prepolymer being the product of reacting said mixture with a compound whuich contains an isocyanate reactive group.
Claim 11
Dependent Claim
72 words
A prepolymer based on methylene diphenyl isocyanate mixture which is rich in the 2,4'-isomer comprising a color stabilizing amount of a cycloaliphatic epoxide compound conforming to ##STR8## and a hindered phenol said mixture containing about 20-90 wt. % of the 4,4'-isomer, 10-70 wt. % of the 2,4'-isomer and 0-10 wt. % of the 2,2'-isomer said prepolymer being the product of reacting said mixture with a compound whuich contains an isocyanate reactive group.
Claim 12
Dependent Claim
88 words
A process for stabilizing a methylene diphenyl isocyanate based prepolymer comprising (i) adding to a mixture of methylene diphenyl isocyanate about 0.04 to 0.5 wt. % of a hindered phenol and (ii) adding about 0.05 to 1 wt. % of a cycloaliphatic epoxide compound conforming to ##STR9## wherein said mixture contains 20-90 wt. % of the 4,4'-isomer, 10-70 wt. % of the 2,4'-isomer and 0-10 wt. % of the 2,2'-isomer said prepolymer being the product of reacting said mixture with a compound which contains an isocyanate reactive group.
Claim 13
Dependent Claim
88 words
A process for stabilizing a methylene diphenyl isocyanate based prepolymer comprising (i) adding to a mixture of methylene diphenyl isocyanate about 0.04 to 0.5 wt. % of a hindered phenol and (ii) adding about 0.05 to 1 wt. % of a cycloaliphatic epoxide compound conforming to ##STR9## wherein said mixture contains 20-90 wt. % of the 4,4'-isomer, 10-70 wt. % of the 2,4'-isomer and 0-10 wt. % of the 2,2'-isomer said prepolymer being the product of reacting said mixture with a compound which contains an isocyanate reactive group.
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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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |