Patent US3661700A successfully refreshed from Google Patents.
US3661700A
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US
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Coated reinforced paper and process for preparing same
Assignee: Montedison SpA
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Filing: 1970-03-18
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Granted: 1972-05-09
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Expires: 1990-03-18
Abstract
Abstract Coated reinforced papers having excellent mechanical and other characteristics are obtained by coating a net-like support obtained from a longitudinally oriented film of polypropylene consisting essentially of isotactic polypropylene with a composition formed of cellulosic or other fibers, mineral and/or organic fillers and/or pigments, and binders.
Inventors
- 👤 Gianfranco Zilio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:47
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/14; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; D21H19/00; D21H19/36; D21H19/44; D21H19/52; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2489/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
Coated paper and similar fibrous structures according to claim 1, characterized in that the net is obtained from a film of polypropylene consisting essentially of isotactic polypropylene and having a melt index of from 0.5 to 20, the net having meshes the sides of which are of the same or different length of from 0.1 to 3.0 cm.
Claim 2
Dependent Claim
25 words
Coated paper and similar fibrous structures according to claim 2, and further characterized in that the net is obtained from a blown film of polypropylene.
Claim 3
Dependent Claim
22 words
Coated paper and similar fibrous structures according to claim 2, further characterized in that the coating contains natural, artificial and synthetic fibers.
Claim 4
Dependent Claim
36 words
Coated paper and similar fibrous structures according to claim 2, further characterized in that the binder in the coating is at least one member selected from the group consisting of natural, animal, vegetable and synthetic glues.
Claim 5
Dependent Claim
30 words
Coated paper and similar fibrous structures according to claim 5, further characterized in that the binder is at least one member selected from the group consisting of casein and gelatine.
Claim 6
Dependent Claim
71 words
A process for preparing coated paper and similar fibrous structures which comprises applying, to both faces of a supporting net obtained from a longitudinally oriented film of polypropylene consisting essentially of isotactic polypropylene, a coating consisting of cellulosic fibers, at least one member selected from the group consisting of mineral and organic fillers and pigments, and at least one binder, drying the coated net, and passing it through a heated calander.
Claim 7
Dependent Claim
25 words
The process according to claim 7, characterized in that the calander is maintained at a temperature of from about 150* C to about 155* C.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |