Patent US5443909A successfully refreshed from Google Patents.
US5443909A
Expired / Lapsed
US
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Microcapsule containing ultraviolet absorber
Assignee: New Oji Paper Co Ltd
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Filing: 1993-09-23
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Granted: 1995-08-22
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Expires: 2013-09-23
Abstract
Abstract The present invention provides a heat sensitive recording material comprising a substrate, a recording layer formed over the substrate and containing a colorless or light-colored basic dye and a color acceptor, and a protective layer formed over the recording layer, the recording material being characterized in that microcapsules having an ultraviolet absorber enclosed therein and having substantially no color forming ability are incorporated in the protective layer. Further, the present invention provides microcapsules having an ultraviolet absorber and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin and mean particle size of 0.1 to 3 mu m.
Inventors
- 👤 Ritsuo Mandoh
- 👤 Takehiro Minami
- 👤 Katsuhiko Ishida
- 👤 Hisayoshi Mitoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/46; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; B41M5/28; B41M5/287; B41M5/42; B41M5/423; B41M5/44; B41M5/443; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
Microcapsules having an ultraviolet absorber comprising a benzotriazole derivative which is liquid at ordinary temperature and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin selected from the group consisting of polyurea resin, polyurethane polyurea resin and aminoaldehyde resin, and mean particle size of 0.1 to 3 μm.
Claim 2
Dependent Claim
54 words
Microcapsules having an ultraviolet absorber comprising a benzotriazole derivative which is liquid at ordinary temperature and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin selected from the group consisting of polyurea resin, polyurethane polyurea resin and aminoaldehyde resin, and mean particle size of 0.1 to 3 μm.
Claim 3
Dependent Claim
25 words
Microcapsules as defined in claim 1 wherein the polyurethane·polyurea resin is one which is prepared by use of an adduct of xylylene diisocyanate and trimethylolpropane.
Claim 4
Dependent Claim
42 words
Microcapsules as defined in claim 1 wherein the polyurea resin or polyurethane·polyurea resin is one which is prepared by use of hexamethylene diisocyanate derivative having a viscosity of up to 1000 cps as determined by a Brookfield type viscometer at 25° C.
Claim 5
Dependent Claim
27 words
Microcapsules as defined in claim 3 wherein the hexamethylene diisocyanate derivative is an isocyanate compound containing as a main component an isocyanurate type trimer of hexamethylene diisocyanate.
Claim 6
Dependent Claim
37 words
Microcapsules as defined in claim 1 wherein the benzotriazole derivative is at least one selected from the group consisting of 2-(2'-hydroxy-3'-dodecyl-5'-methylphenyl)-benzotriazole, 2[2'-hydroxy-4'-(2"-ethylhexyl)oxyphenyl]-benzotriazole, octyl 5-tert-butyl-3-(5-chloro-2H-benzotriazole-2-yl)-4-hydroxybenzene-propionate, and condensate of methyl 3-[3-tert-butyl-5-(2H-benzotriazole-2-yl)-4-hydroxyphenyl] propionate and polyethylene glycol (molecular weight: about 300).
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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) | 1998-08-21 | 1999-02-20 | 1999-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-21 | 2003-02-20 | 2003-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-21 | 2007-02-20 | 2007-08-22 | $7700.00 | Window Closed / Lapsed |