Patent US2918794A successfully refreshed from Google Patents.
US4260718A
Expired / Lapsed
US
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Modified carbodiimide-containing polyisocyanates and glassy polyurethanes therefrom
Assignee: Dow Chemical Co
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Filing: 1979-12-18
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Granted: 1981-04-07
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Expires: 1999-12-18
Abstract
Abstract Novel liquid organic polyisocyanate compositions are disclosed which are obtained by reacting a carbodiimide-containing organic polyisocyanate with a carboxylic acid terminated butadiene-acrylonitrile low molecular weight copolymer in the proportions of from about 2 to about 30 parts of the copolymer per 100 parts of the polyisocyanate provided there is from about 0.01 to about 0.5 carboxylic acid equivalent per equivalent of carbodiimide. The liquid polyisocyanates are particularly useful in providing hard glassy polyurethanes having improved impact strengths.
Inventors
- 👤 William J. Farrissey, Jr.
- 👤 David J. Goldwasser
- 👤 Kemal B. Onder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C08G18/28; C08G18/67; C08G18/69; C08G18/692
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A liquid organic polyisocyanate composition comprising the product obtained by heating together at a temperature of from about 40° C. to about 105° C. a mixture comprising: (a) a carbodiimide-containing organic polyisocyanate; and (b) a carboxylic acid terminated butadiene-acrylonitrile copolymer characterized by a carboxylic acid functionality of from about 1.75 to about 2.5, a viscosity in centipoises at 27° C. of from about 55,000 to about 625,000, and an acrylonitrile content of from about 5 to about 30 percent by weight of said butadiene-acrylonitrile copolymer, and wherein said butadiene-acrylonitrile coplymer is employed in the proportions by weight of from about 2 to about 30 parts per 100 parts of said polyisocyanate provided there is from about 0.01 to about 0.5 carboxylic acid equivalent per equivalent of carbodiimide.
Claim 2
Dependent Claim
127 words
A liquid organic polyisocyanate composition comprising the product obtained by heating together at a temperature of from about 40° C. to about 105° C. a mixture comprising: (a) a carbodiimide-containing organic polyisocyanate; and (b) a carboxylic acid terminated butadiene-acrylonitrile copolymer characterized by a carboxylic acid functionality of from about 1.75 to about 2.5, a viscosity in centipoises at 27° C. of from about 55,000 to about 625,000, and an acrylonitrile content of from about 5 to about 30 percent by weight of said butadiene-acrylonitrile copolymer, and wherein said butadiene-acrylonitrile coplymer is employed in the proportions by weight of from about 2 to about 30 parts per 100 parts of said polyisocyanate provided there is from about 0.01 to about 0.5 carboxylic acid equivalent per equivalent of carbodiimide.
Claim 3
Dependent Claim
14 words
A composition according to claim 1 wherein said (a) is a carbodiimide-containing aromatic polyisocyanate.
Claim 4
Dependent Claim
26 words
A composition according to claim 2 wherein said (a) is a carbodiimide-containing methylenebis(phenyl isocyanate) having an isocyanate equivalent weight of from about 130 to about 180.
Claim 5
Dependent Claim
27 words
A composition according to claim 1 wherein said (b) is employed in the proportion of from about 5 to about 25 parts per 100 parts of polyisocyanate.
Claim 6
Dependent Claim
38 words
A composition according to claim 1 wherein said butadiene-acrylonitrile has an acrylonitrile content of about 17 percent by weight, a terminal carboxylic acid functionality of about 1.85, and a viscosity in centipoises at 27° C. of about 125,000.
Claim 7
Dependent Claim
111 words
A liquid organic polyisocyanate composition comprising the product obtained by heating together at a temperature of from about 40° C. to about 105° C. a mixture comprising: (a) a carbodiimide-containing methylenebis(phenyl isocyanate) having an isocyanate equivalent weight of from about 130 to about 180; and (b) from about 5 to about 25 parts per 100 parts of (a) of a butadiene-acrylonitrile copolymer characterized by a terminal carboxylic acid functionality of about 1.85, an acrylonitrile content of about 17 percent by weight, and a viscosity in centipoises at 27° C. of about 125,000 and further provided that there is from about 0.01 to about 0.5 carboxylic acid equivalent per equivalent of carbodiimide.
Claim 8
Dependent Claim
111 words
A liquid organic polyisocyanate composition comprising the product obtained by heating together at a temperature of from about 40° C. to about 105° C. a mixture comprising: (a) a carbodiimide-containing methylenebis(phenyl isocyanate) having an isocyanate equivalent weight of from about 130 to about 180; and (b) from about 5 to about 25 parts per 100 parts of (a) of a butadiene-acrylonitrile copolymer characterized by a terminal carboxylic acid functionality of about 1.85, an acrylonitrile content of about 17 percent by weight, and a viscosity in centipoises at 27° C. of about 125,000 and further provided that there is from about 0.01 to about 0.5 carboxylic acid equivalent per equivalent of carbodiimide.
Claim 9
Dependent Claim
59 words
A composition according to claim 6 wherein said (b) is employed in the proportions by weight of from about 10 to about 20 parts per 100 parts of said (a) which latter has an isocyanate equivalent weight of about 142 to about 147, and said (a) and said (b) are heated together at a temperature of about 100° C.
Claim 10
Dependent Claim
24 words
A glassy polyurethane polymer prepared by the reaction of a polyisocyanate composition in accordance with claim 1 and at least one organic polyhydric alcohol.
References Cited (Backward Citations)
US3285949A
Cited
US4077989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |