Patent US5045622A successfully refreshed from Google Patents.
US5045622A
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US
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Polycarbonate polyol, aromatic polycarbonate polyurethane resin, coating agent, cast film, magnetic recording medium
Assignee: Maxell Ltd
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Filing: 1989-06-20
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Granted: 1991-09-03
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Expires: 2009-06-20
Abstract
Abstract A polycarbonate polyol having a main chain of the formula: <IMAGE> wherein R is an aliphatic or alicyclic hydrcarbon group having 4 to 10 carbon atoms, and n is a number of 2.00 to 20.00, and having an aliphatic OH group at the terminal; an aromatic polycarbonate polyurethane resin prepared from the polycarbonate polyol as set forth above and a polyisocyanate compound having two or more isocyanate groups in the molecule and optionally other components, particularly a chain extender having a polar group; a coating agent comprising the polycarbonate polyol and/or aromatic polycarbonate polyurethane resin as set forth above and optionally a polyisocyanate compound as set forth above and a solvent; a cast film comprising a coating film formed from the polycarbonate polyol and/or aromatic polycarbonate polyurethane resin as set forth above and a base film; and a magnetic recording medium compriisng a magnetic layer formed from the aromatic polycarbonate polyurethane resin as set forth above and optionally the polyisocyanate compound as set forth above, and a base film.
Inventors
- 👤 Kenji Kohno
- 👤 Yoshiyuki Nagataki
- 👤 Kazushi Miyata
- 👤 Hiroshi Higashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/44; C08G18/65; C08G18/66; C08G18/6633; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
An aromatic polycarbonate polyurethane resin comprising the reaction product of from a polycarbonate polyol having a main chain of the formula: ##STR6## wherein R is an aliphatic hydrocarbon group having 4 to 10 carbon atoms or an alicyclic hydrocarbon group having 4 to 10 carbon atoms and n is a number of 2.00 to 20.00, and having an aliphatic OH group at the terminal; and a polyisocyanate compound having two or more isocyanate groups in the molecule; and optionally other component.
Claim 2
Dependent Claim
81 words
An aromatic polycarbonate polyurethane resin comprising the reaction product of from a polycarbonate polyol having a main chain of the formula: ##STR6## wherein R is an aliphatic hydrocarbon group having 4 to 10 carbon atoms or an alicyclic hydrocarbon group having 4 to 10 carbon atoms and n is a number of 2.00 to 20.00, and having an aliphatic OH group at the terminal; and a polyisocyanate compound having two or more isocyanate groups in the molecule; and optionally other component.
Claim 3
Dependent Claim
40 words
The aromatic polycarbonate polyurethane resin according to claim 1, wherein the other component is a chain extender having a polar group selected from hydroxy group, carboxyl group, phosphoric acid group, sulfonic acid group, tertiary amino group, or a salt thereof.
Claim 4
Dependent Claim
74 words
A coating agent which comprises a polycarbonate polyol which has a main chain of the formula: ##STR7## wherein R is an aliphatic hydrocarbon group having 4 to 10 carbon atoms or an alicyclic hydrocarbon group having 4 to 10 carbon atoms and n is a number of 2.00 to 20.00, and has an aliphatic OH group at the terminal; a polyisocyanate compound having two or more isocyanate groups in the molecule; and a solvent.
Claim 5
Dependent Claim
74 words
A coating agent which comprises a polycarbonate polyol which has a main chain of the formula: ##STR7## wherein R is an aliphatic hydrocarbon group having 4 to 10 carbon atoms or an alicyclic hydrocarbon group having 4 to 10 carbon atoms and n is a number of 2.00 to 20.00, and has an aliphatic OH group at the terminal; a polyisocyanate compound having two or more isocyanate groups in the molecule; and a solvent.
Claim 6
Dependent Claim
19 words
A coating agent which comprises the aromatic polycarbonate polyurethane resin as set forth in claim 1, and a solvent.
Claim 7
Dependent Claim
31 words
A coating agent which comprises the aromatic polycarbonate polyurethane resin as set forth in claim 1, a polyisocyanate compound having two or more isocyanate groups in the molecule, and a solvent.
Claim 8
Dependent Claim
77 words
A cast film which comprises a coating film formed from a polycarbonate polyol which has a main chain of the formula: ##STR8## wherein R is an aliphatic hydrocarbon group having 4 to 10 carbon atoms or an alicyclic hydrocarbon group having 4 to 10 carbon atoms and n is a number of 2.00 to 20.00, and has an aliphatic OH group at the terminal; and a polyisocyanate compound having two or more isocyanate groups in the molecule.
Claim 9
Dependent Claim
77 words
A cast film which comprises a coating film formed from a polycarbonate polyol which has a main chain of the formula: ##STR8## wherein R is an aliphatic hydrocarbon group having 4 to 10 carbon atoms or an alicyclic hydrocarbon group having 4 to 10 carbon atoms and n is a number of 2.00 to 20.00, and has an aliphatic OH group at the terminal; and a polyisocyanate compound having two or more isocyanate groups in the molecule.
Claim 10
Dependent Claim
21 words
A cast film which comprises a coating film formed from the aromatic polycarbonate polyurethane resin as set forth in claim 1.
Claim 11
Dependent Claim
34 words
A cast film which comprises a coating film formed from the aromatic polycarbonate polyurethane resin as set forth in claim 1 and a polyisocyanate compound having two or more isocyanate groups in the molecule.
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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |