Patent US4058434A successfully refreshed from Google Patents.
US4058434A
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Opacified paper sheet and method for production thereof
Assignee: Champion International Corp
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Filing: 1976-08-24
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Granted: 1977-11-15
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Expires: 1996-08-24
Abstract
Abstract Opacifying agents, which may be coated onto or incorporated into paper sheets, consisting essentially of spherical aldehyde condensation polymeric super-particles, each having a spherical, discontinuous shell surrounding a spherical hollow core, said shell composed of agglomerated, discrete spherical aldehyde condensation polymeric secondary particles which are solid throughout. The opacifying agents are incorporated into paper sheets by admixing cellulosic fibers with the super-particles.
Inventors
- 👤 David N. Vincent
- 👤 Ronald Golden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:57
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/42; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C08G12/26; C08G12/34; C08G12/36; C08G12/38; C08J; C08J3/00; C08J3/12; C09; C09D; C09D7/00; C09D7/40; C09D7/42; D21H21/00; D21H21/14; D21H21/28; D21H21/285; D21H21/50; D21H21/52; D21H21/54; Y; Y10; Y10S; Y10S521/00; Y10S521/919; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249971; Y10T428/249972; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
71 words
A process for the formation of opacified paper sheet, which comprises admixing cellulosic fibers and opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout, and forming said admixture into a paper sheet.
Claim 2
Dependent Claim
71 words
A process for the formation of opacified paper sheet, which comprises admixing cellulosic fibers and opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout, and forming said admixture into a paper sheet.
Claim 3
Dependent Claim
36 words
The process of claim 1 wherein said super-particles have an average diameter of between about 1 and about 20 microns and said secondary particles have an average diameter of between about 0.2 and about 1 micron.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein said super-particles have an average diameter of between about 2 and about 7 microns.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein said secondary particles are formed of urea-formaldehyde or phenol-formaldehyde.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein said secondary particles are formed of urea-formaldehyde.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein said particles additionally comprise melamine.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein said secondary particles additionally comprise TiO 2 .
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein said secondary particles additionally comprise clay.
Claim 10
Dependent Claim
62 words
A paper sheet consisting essentially of cellulosic fibers having opacifying agents incorporated therein, said opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout.
Claim 11
Dependent Claim
62 words
A paper sheet consisting essentially of cellulosic fibers having opacifying agents incorporated therein, said opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout.
Claim 12
Dependent Claim
36 words
The sheet of claim 9 where said super-particles have an average diameter of between about 1 and about 20 microns and said secondary particles have an average diameter of between about 0.2 and about 1 micron.
Claim 13
Dependent Claim
20 words
The sheet of claim 10 wherein said super-particles have an average diameter of between about 2 and about 7 microns.
Claim 14
Dependent Claim
15 words
The sheet of claim 9 wherein said secondary particles are formed of urea-formaldehyde or phenol-formaldehyde.
Claim 15
Dependent Claim
13 words
The sheet of claim 12 wherein said secondary particles are formed of urea-formaldehyde.
Claim 16
Dependent Claim
11 words
The sheet of claim 13 wherein said particles additionally comprise melamine.
Claim 17
Dependent Claim
14 words
The sheet of claim 9 wherein said secondary particles additionally comprise TiO 2 .
Claim 18
Dependent Claim
12 words
The sheet of claim 9 wherein said secondary particles additionally comprise clay.
Claim 19
Dependent Claim
62 words
A paper sheet consisting essentially of cellulosic fibers having opacifying agents coated thereon, said opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout.
Claim 20
Dependent Claim
62 words
A paper sheet consisting essentially of cellulosic fibers having opacifying agents coated thereon, said opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout.
Claim 21
Dependent Claim
37 words
The paper sheet of claim 17 wherein said super-particles have an average diameter of between about 1 and about 20 microns and said secondary particles have an average diameter of between about 0.2 and about 1 micron.
Claim 22
Dependent Claim
21 words
The paper sheet of claim 18 wherein said super-particles have an average diameter of between about 2 and about 7 microns.
Claim 23
Dependent Claim
16 words
The paper sheet of claim 17 wherein said secondary particles are formed of urea-formaldehyde or phenol-formaldehyde.
Claim 24
Dependent Claim
14 words
The paper sheet of claim 20 wherein said secondary particles are formed of urea-formaldehyde.
Claim 25
Dependent Claim
12 words
The paper sheet of claim 21 wherein said particles additionally comprise melamine.
Claim 26
Dependent Claim
15 words
The paper sheet of claim 19 wherein said secondary particles additionally comprise TiO 2 .
Claim 27
Dependent Claim
13 words
The paper sheet of claim 17 wherein said secondary particles additionally comprise clay.
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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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |