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US3844816A
Expired / Lapsed
US
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Grafted, polymeric microcapsular system
Assignee: US Plywood Champion Papers Inc
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Filing: 1972-03-15
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Granted: 1974-10-29
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Expires: 1992-03-15
Abstract
Abstract Discrete, substantially spherical microcapsules having a solid polymeric shell and a solid, non-tacky polymeric core, which is grafted to the polymeric shell, are provided. Such microcapsules may be coated onto cellulosic substrates or incorporated into such substrates and subsequently fused to provide cellulosic substrates having a polymeric film bonded thereto and increased strength, respectively. The grafting of the normally nonadherent core material to the shell of the microcapsules provides a means of forming a bond between a normally nonadherent polymer and a cellulosic material. The microcapsules may be effectively employed as load-bearing agents and opacifying agents.
Inventors
- 👤 A Vassiliades
- 👤 D Vincent
- 👤 S Shroff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:12
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/1243; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31967
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
120 words
A RECORD SHEET WHICH COMPRISES A SUBSTRATE HAVING A COATING ON A SURFACE THEREOF, WHICH COATING COMPRISES PRESSURE-RUPTURABLE, IMAGE-FORMING MICROCAPSULES, A BINDER FOR SAID IMAGE-FORMING MICROCAPSULES AND AN EFFECTIVE AMOUNT OF MICROCAPSULAR LOAD-BEARING AGENTS, SAID LOAD-BEARING AGENTS CONSISTING ESSENTIALLY OF DISCRETE, SUBSTANTIALLY SPHERICAL NONPRESSURE RUPTURABLE MICROCAPSULES HAVING A SOLID, POLYMERIC SHELL AND A SOLID, POLYMERIC CORE, SAID SHELL BEING ADHERABLE BY SAID BINDER TO SAID SUBSTRATE, SAID POLYMERIC CORE BEING AT LEAST PARTIALLY GRAFTED TO SAID POLYMERIC SHELL, SAID CORE AND SAID SHELL BEING FORMED OF DIFFERENT POLYMERIC MATERIALS, SAID LOADBEARING MICROCAPSULES HAVING A LARGER AVERAGE DIAMETER THAN SAID IMAGEFORMING MICROCAPSULES, SAID LOAD BEARING AGENTS HAVING AN AVERAGE DIAMETER IN THE RANGE OF BETWEEN ABOUT 5 AND ABOUT 50 MICRONS.
Claim 2
Dependent Claim
120 words
A RECORD SHEET WHICH COMPRISES A SUBSTRATE HAVING A COATING ON A SURFACE THEREOF, WHICH COATING COMPRISES PRESSURE-RUPTURABLE, IMAGE-FORMING MICROCAPSULES, A BINDER FOR SAID IMAGE-FORMING MICROCAPSULES AND AN EFFECTIVE AMOUNT OF MICROCAPSULAR LOAD-BEARING AGENTS, SAID LOAD-BEARING AGENTS CONSISTING ESSENTIALLY OF DISCRETE, SUBSTANTIALLY SPHERICAL NONPRESSURE RUPTURABLE MICROCAPSULES HAVING A SOLID, POLYMERIC SHELL AND A SOLID, POLYMERIC CORE, SAID SHELL BEING ADHERABLE BY SAID BINDER TO SAID SUBSTRATE, SAID POLYMERIC CORE BEING AT LEAST PARTIALLY GRAFTED TO SAID POLYMERIC SHELL, SAID CORE AND SAID SHELL BEING FORMED OF DIFFERENT POLYMERIC MATERIALS, SAID LOADBEARING MICROCAPSULES HAVING A LARGER AVERAGE DIAMETER THAN SAID IMAGEFORMING MICROCAPSULES, SAID LOAD BEARING AGENTS HAVING AN AVERAGE DIAMETER IN THE RANGE OF BETWEEN ABOUT 5 AND ABOUT 50 MICRONS.
Claim 3
Dependent Claim
25 words
The record sheet of claim 1 wherein said load-bearing agents have an average diameter in the range of between about 15 and about 30 microns.
Claim 4
Dependent Claim
26 words
The record sheet of claim 1 wherein the shell of said load-bearing agent comprises an hydroxylated polymer and said core is formed of a thermoplastic polymer.
Claim 5
Dependent Claim
18 words
The record sheet of claim 3 where said shell comprises a substituted starch, methyl cellulose or polyvinyl alcohol.
Claim 6
Dependent Claim
12 words
The record sheet of claim 4 wherein said shell comprises polyvinyl alcohol.
Claim 7
Dependent Claim
25 words
The record sheet of claim 1 wherein between about 20 and about 80 percent of said polymeric core material is grafted to said polymeric shell.
Claim 8
Dependent Claim
12 words
The record sheet of claim 4 wherein said polymeric core comprises polystyrene.
Claim 9
Dependent Claim
13 words
The record sheet of claim 5 wherein said polymeric core material comprises polystyrene.
Claim 10
Dependent Claim
15 words
The record sheet of claim 1 wherein said polymeric core is a non-tacky polymeric material.
Claim 11
Dependent Claim
126 words
A record sheet which comprises a substrate having a coating on a surface thereof, which coating comprises pressure-rupturable, image-forming microcapsules and an effective amount of microcapsular load-bearing agents, said load-bearing agents consisting essentially of discrete, substantially spherical, non-pressure rupturable microcapsules having a solid, polymeric shell and a solid, polymeric core, said polymeric core being at least partially grafted to said polymeric shell, said core and said shell being formed of different polymeric materials, said image-forming microcapsules having a shell that is formed of the same material as is said solid, polymeric shell of said load-bearing agents, said load-bearing microcapsules having a larger diameter than said image-bearing microcapsules, said load bearing microcapsules having an average diameter in the range of between about 5 and about 50 microns.
Claim 12
Dependent Claim
126 words
A record sheet which comprises a substrate having a coating on a surface thereof, which coating comprises pressure-rupturable, image-forming microcapsules and an effective amount of microcapsular load-bearing agents, said load-bearing agents consisting essentially of discrete, substantially spherical, non-pressure rupturable microcapsules having a solid, polymeric shell and a solid, polymeric core, said polymeric core being at least partially grafted to said polymeric shell, said core and said shell being formed of different polymeric materials, said image-forming microcapsules having a shell that is formed of the same material as is said solid, polymeric shell of said load-bearing agents, said load-bearing microcapsules having a larger diameter than said image-bearing microcapsules, said load bearing microcapsules having an average diameter in the range of between about 5 and about 50 microns.
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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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |