US3934069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-smudging pressure-sensitive copying material
Assignee: BASF SE
•
Filing: 1974-06-28
•
Granted: 1976-01-20
•
Expires: 1994-06-28
Abstract
Abstract A pressure-sensitive copying material consisting of a sheet-like base to which has been applied a coating comprising microcapsules containing dyes. The microcapsules are filled with a solution or suspension of a salt of a dye base and an organic carboxylic acid in an organic water-immiscible solvent. The copying material is distinguished by exceptional non-smudging characteristics and is particularly suitable for the production of business forms.
Inventors
- 👤 Otto Atzrott
- 👤 Wolfgang Sliwka
- 👤 Heinz Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:39
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/165; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/249997; Y10T428/25; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
A non-smudging pressure-sensitive copying material which comprises: a sheet-like base and a coating on said base, said coating including microcapsules, said microcapsules containing as a core material a solution of a salt of a dye base and an aliphatic carboxylic acid of eight to thirty carbon atoms in an organic water-immiscible solvent, the ratio of organic carboxylic acid to dye base is from about 1:1 to equivalents.
Claim 2
Dependent Claim
67 words
A non-smudging pressure-sensitive copying material which comprises: a sheet-like base and a coating on said base, said coating including microcapsules, said microcapsules containing as a core material a solution of a salt of a dye base and an aliphatic carboxylic acid of eight to thirty carbon atoms in an organic water-immiscible solvent, the ratio of organic carboxylic acid to dye base is from about 1:1 to equivalents.
Claim 3
Dependent Claim
20 words
A copying material as claimed in claim 1, wherein the dye base is a nigrosine base or an induline base.
Claim 4
Dependent Claim
36 words
A copying material as claimed in claim 1, wherein the organic water-immiscible solvent consists of high-boiling aliphatic or araliphatic hydrocarbons or phthalic acid esters of aliphatic alcohols of three to 18 carbon atoms, or mixtures thereof.
Claim 5
Dependent Claim
28 words
A copying material as claimed in claim 1, wherein the concentration of the dye base in the organic water-immiscible solvent is from 5 to 50 percent by weight.
Claim 6
Dependent Claim
41 words
A copying material as claimed in claim 1, wherein the viscosity of the solution or suspension of the dye salt in the organic water-immiscible solvent is 10 to 10,000 cP at a rate of shear of 100 sec - 1 .
Claim 7
Dependent Claim
22 words
A copying material as claimed in claim 1, wherein the wall material of the microcapsules is gelatine or an acrylic ester copolymer.
Claim 8
Dependent Claim
20 words
A copying material as claimed in claim 1, wherein the microcapsules contain a pigment additionally to the dye salt solution.
Claim 9
Dependent Claim
14 words
A copying material as claimed in claim 1, wherein the sheet-like base is paper.
Claim 10
Dependent Claim
28 words
A copying material as claimed in claim 1, wherein the binder for the microcapsule coating is a polymer dispersion based on vinyl acetate, styrene/butadiene, styrene/acrylate or acrylate copolymers.
Claim 11
Dependent Claim
19 words
A copying material as claimed in claim 1, wherein the micro-capsule coating contains cellulose or polystyrene as a filler.
Claim 12
Dependent Claim
23 words
A copying material as claimed in claim 1, wherein the micro-capsule layer bears a coating which masks the inherent color of the microcapsules.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |