US3874895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording sheet
Assignee: Fujifilm Holdings Corp
•
Filing: 1972-10-30
•
Granted: 1975-04-01
•
Expires: 1992-10-30
Abstract
Abstract A recording sheet comprising a support having thereon a color developer layer capable of reacting with a color former to form a color image, which color developer layer comprises (1) an acidic polymer and (2) an organic carboxylic acid or a metal salt thereof.
Inventors
- 👤 Takao Hayashi
- 👤 Hajime Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:20
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/124; B41M5/132; B41M5/155; B41M5/3331; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24835
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
13 words
The recording sheet of claim 1 where the acid comprises the benzene ring.
Claim 2
Dependent Claim
37 words
The recording sheet of claim 1 where the acid is substituted with one or more members from the group consisting of an alkyl group having more than three carbon atoms, an aryl group or a cyclohexyl group.
Claim 3
Dependent Claim
14 words
The recording sheet of claim 1 where the acid polymer is a phenolic polymer.
Claim 4
Dependent Claim
24 words
The recording sheet of claim 4 where the phenolic polymer is selected from the group consisting of phenol aldehyde polymers and phenol acetylene polymers.
Claim 5
Dependent Claim
20 words
The recording sheet of claim 5 where the polymers have a polymerization degree of from about 2 to about 15.
Claim 6
Dependent Claim
16 words
The recording sheet of claim 1 where the acid polymer is a salicylic acid formaldehyde polymer.
Claim 7
Dependent Claim
36 words
The recording sheet of claim 1 wherein from about 0.05 to about 2 parts by weight of the organic carboxylic acid or metal salt thereof is present per 1 part by weight of the acidic polymer.
Claim 8
Dependent Claim
30 words
The recording sheet of claim 8 where from about 0.05 to about 0.2 parts by weight of the binder is present per 1 part by weight of the acid polymer.
Claim 9
Dependent Claim
35 words
The recording sheet of claim 9 wherein the layer is coated on the support in an amount of about 0.1 g to 3 g per 1 m2 of coated area, based on acidic polymer content.
Claim 10
Dependent Claim
118 words
The recording sheet of claim 1 further comprising an organic resin binder wherein the acidic polymer is a phenolic polymer or a salicylic acid-formaldehyde copolymer having a polymerization degree of from about 2 to about 15, further wherein: the acid or metal salt thereof is present in an amount of from about 0.1 to about 2 parts by weight per part by weight of the acidic polymer; the binder is present in an amount of from about 0.1 to about 0.2 parts by weight per part by weight of the acidic polymer; and the layer is coated in an amount of from about 0.3 to about 3 g per m2 of coated area, based on the acidic polymer.
Claim 11
Dependent Claim
61 words
In a process for forming a color image by the reaction of color former and a color developer comprising an acidic polymer, the improvement wherein the color developer and color former are reacted in the presence of an organic aromatic carboxylic acid having 1 to 3 carboxylic acid groups and having 1 to 3 hydroxyl groups or a metal salt thereof.
Claim 12
Dependent Claim
70 words
A recording sheet comprising a support having thereon a color developer layer capable of reacting with a color former to form a color image, which color developer layer comprises (1) an acidic polymer capable of donating or emitting a hydrogen proton, (2) an organic aromatic carboxylic acid having 1 to 3 carboxylic acid groups and having 1 to 3 hydroxyl groups or a metal salt thereof, and (3) a binder.
Claim 13
Dependent Claim
205 words
A recording sheet comprising a support having thereon a color developer layer capable of reacting with a color former to form a color image, which color developer layer comprises (1) an acidic polymer selected from the group consisting of phenol-aldehyde polymers, phenol-acetylene polymers, salicylic acid-formaldehyde polymers, malic acid-rosin resins, partially or completely hydrolyzed styrene-maleic anhydride copolymers, partially or completely hydrolyzed ethylenemaleic anhydride copolymers and partially or completely hydrolyzed vinylmethylether-maleic anhydride copolymers, and (2) organic aromatic carboxylic acid selected from the group consisting of salicylic acid, o-chlorosalicylic acid, m-hydroxyalicylic acid, p-hydroxysalicylic acid, gallic acid, 2,4-cresotinic acid, 5-methylsalicylic acid, 5-tert-butylsalicylic acid, 3,5-di-sec-butylsalicylic acid, 3,5-di-sec-butylsalicylic acid, 3-methyl-5-tert-butylsalicylic acid, 3,5-di-tert-butylsalicylic acid, 5-isomylsalicylic acid, 3-phenylsalicylic acid, 5-cyclohexylsalicylic acid or a metal salt thereof and (3) a binder, the acid or metal salt being present in an amount of from about 0.1 to about 2 parts by weight per part by weight of the acidic polymer, the binder being present in an amount of from about 0.1 to about 0.2 parts by weight per part by weight of the acidic polymer, and the developer layer being coated on the support in an amount of from about 0.3 to about 3 g per m2 of coated area, based on the acidic polymer.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |