US4431450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desensitizing ink for pressure sensitive copying sheets
Assignee: Nippon Paper Industries Co Ltd
•
Filing: 1982-02-12
•
Granted: 1984-02-14
•
Expires: 2002-02-12
Abstract
Abstract A desensitizing ink for pressure sensitive copying sheets using at least a desensitizing agent, pigment and binder, wherein said desensitizing agent comprises at least propylene oxide addition compound selected from compounds of the following formulas: ##STR1## wherein a, b and c represent identical or different integers greater than 1; R is an alkyl group, an alkenyl group, an aryl group, substituted alkyl group, substituted alkenyl group or substituted aryl group; and n is an integer greater than 1. The desensitizing inks of the present invention exhibit sufficient desensitizing effect, excellent yellowing resistance and excellent printability, particularly in wet offset printing.
Inventors
- 👤 Akira Hasegawa
- 👤 Mamoru Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:45
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/128
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
43 words
A desensitizing ink for pressure sensitive copying sheets using at least a desensitizing agent, pigment and binder, wherein said desensitizing agent comprises propylene oxide addition compound of following formula: ##STR5## wherein a, b and c represent identical or different integers greater than 1.
Claim 2
Dependent Claim
43 words
A desensitizing ink for pressure sensitive copying sheets using at least a desensitizing agent, pigment and binder, wherein said desensitizing agent comprises propylene oxide addition compound of following formula: ##STR5## wherein a, b and c represent identical or different integers greater than 1.
Claim 3
Dependent Claim
34 words
A desensitizing ink according to claim 1, wherein said glycerol-propylene oxide addition compound of the formula (1) with an average molecular weight of 1000 (a+b+c=15) to 7000 (a+b+c=119) is used for wet offset printing.
References Cited (Backward Citations)
US4101690A
Cited
US4291102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |