US4115474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grafted, polymeric microcapsular system
Assignee: Champion International Corp
•
Filing: 1974-05-21
•
Granted: 1978-09-19
•
Expires: 1994-05-21
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
- 👤 Anthony E. Vassiliades
- 👤 David N. Vincent
- 👤 Shrenik Shroff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:05
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: 7
Claim 1
Independent Claim
68 words
Discrete, substantially spherical non-pressure rupturable microcapsules having a solid, polymeric shell and a core, which consists essentially of a solid, non-tacky polymeric material, said polymeric core material being at least partially grafted to said polymeric shell, said solid, non-tacky polymeric core and said polymeric shell being formed of different polymers, said solid, polymeric shell consisting essentially of an hydroxylated polymer, a formaldehyde condensation product, polyvinyl chloride or gelatin.
Claim 2
Dependent Claim
68 words
Discrete, substantially spherical non-pressure rupturable microcapsules having a solid, polymeric shell and a core, which consists essentially of a solid, non-tacky polymeric material, said polymeric core material being at least partially grafted to said polymeric shell, said solid, non-tacky polymeric core and said polymeric shell being formed of different polymers, said solid, polymeric shell consisting essentially of an hydroxylated polymer, a formaldehyde condensation product, polyvinyl chloride or gelatin.
Claim 3
Dependent Claim
24 words
The microcapsules of claim 1 wherein between 20 and about 80 percent of said solid, polymeric core is grafted to said solid outer shell.
Claim 4
Dependent Claim
17 words
The microcapsules of claim 1 wherein said capsules have an average particle diameter below about 1 micron.
Claim 5
Dependent Claim
13 words
A high gloss coating consisting essentially of the opacifying agents of claim 3.
Claim 6
Dependent Claim
18 words
The microcapsules of claim 2 wherein said polymeric shell is polyvinyl alcohol and said polymeric core is polystyrene.
Claim 7
Dependent Claim
14 words
The microcapsules of claim 5 wherein said polyvinyl alcohol shell is cross-linked by urea-formaldehyde.
References Cited (Backward Citations)
US3429827A
Cited
US3577515A
Cited
US3405071A
Cited
US3516941A
Cited
US3657144A
Cited
US3577363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |