US4075389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opaque microcapsular release sheet
Assignee: Champion International Corp
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Filing: 1972-02-28
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Granted: 1978-02-21
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Expires: 1992-02-28
Abstract
Abstract Opaque release sheet comprising a base having a coating comprising a primary release agent in the form of air-containing microcapsular opacifiers which may be used in combination with a minor amount of a secondary release agent, such as silicone-poly-glycol copolymer, a methoxysilane, polyethylene, a metal complex or the like, provide opaque, lightweight, dimensionally stable release sheets.
Inventors
- 👤 Anthony E. Vassiliades
- 👤 David N. Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:12
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/025; C; C09; C09J; C09J7/00; C09J7/20; C09J7/201; C09J7/21; C09J2400/00; C09J2400/20; C09J2400/28; C09J2400/283; C09J2423/00; C09J2423/04; C09J2423/045; C09J2483/00; C09J2483/005; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1405; Y10T428/249921; Y10T428/249953; Y10T428/249971; Y10T428/249972; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31855; Y10T428/31859; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
136 words
An opaque release sheet which comprises a substrate having at least one surface coated with a release composition, said release composition comprising three separate ingredients, said first ingredient being a primary release agent consisting essentially of discrete, substantially spherical, air-containing microcapsules, said second ingredient being binder for adhering said microcapsules to said substrate, and said third ingredient being between about 1 and 30 percent by weight of said air-containing microcapsules on a dry basis of a secondary release agent, said secondary release agent improving the release properties of said release composition as compared with said release composition omitting said secondary release agent, said release sheet being capable of removal from a tacky surface when said coated surface is applied thereto without affecting the properties of said tacky surface or said surface coated with said release composition.
Claim 2
Dependent Claim
136 words
An opaque release sheet which comprises a substrate having at least one surface coated with a release composition, said release composition comprising three separate ingredients, said first ingredient being a primary release agent consisting essentially of discrete, substantially spherical, air-containing microcapsules, said second ingredient being binder for adhering said microcapsules to said substrate, and said third ingredient being between about 1 and 30 percent by weight of said air-containing microcapsules on a dry basis of a secondary release agent, said secondary release agent improving the release properties of said release composition as compared with said release composition omitting said secondary release agent, said release sheet being capable of removal from a tacky surface when said coated surface is applied thereto without affecting the properties of said tacky surface or said surface coated with said release composition.
Claim 3
Dependent Claim
19 words
A release sheet according to claim 1 wherein said secondary release agent is a chromic complex of stearic acid.
Claim 4
Dependent Claim
14 words
A release sheet according to claim 1 wherein said secondary release agent is polyethylene.
Claim 5
Dependent Claim
19 words
A release sheet according to claim 1 wherein two sides of said substrate are coated with said release composition.
Claim 6
Dependent Claim
14 words
A release sheet according to claim 4 wherein said coatings have different release values.
Claim 7
Dependent Claim
20 words
A release sheet according to claim 1 wherein said air-containing microcapsules have an average particle diameter below about 2 microns.
Claim 8
Dependent Claim
11 words
The release sheet of claim 1 wherein said substrate is paper.
Claim 9
Dependent Claim
14 words
The release sheet of claim 1 wherein said secondary release agent is a poly(organosiloxane).
Claim 10
Independent Claim
103 words
A method for the production of a highly opaque release sheet, which comprises coating a substrate with an aqueous release composition comprising three separate ingredients, said first ingredient being a primary release agent consisting essentially of discrete, substantially spherical, air-containing microcapsules, said second ingredient being binder for adhering said microcapsules to said sheet, and said third ingredient being between about 1 and about 30 percent by weight of said air-containing microcapsules on a dry basis of a secondary release agent, said secondary release agent improving the release properties of said release composition as compared with said release composition omitting said secondary release agent.
Claim 11
Independent Claim
103 words
A method for the production of a highly opaque release sheet, which comprises coating a substrate with an aqueous release composition comprising three separate ingredients, said first ingredient being a primary release agent consisting essentially of discrete, substantially spherical, air-containing microcapsules, said second ingredient being binder for adhering said microcapsules to said sheet, and said third ingredient being between about 1 and about 30 percent by weight of said air-containing microcapsules on a dry basis of a secondary release agent, said secondary release agent improving the release properties of said release composition as compared with said release composition omitting said secondary release agent.
Claim 12
Dependent Claim
70 words
An opaque release sheet which comprises a substrate having at least one surface coated with a release composition, said release composition comprising a primary release agent consisting essentially of discrete, substantially spherical, air-containing microcapsules and an effective amount of a secondary release agent, said secondary release agent being a member selected from the group consisting of polyethylene, a methoxysilane, a silicone-polyglycol copolymer and a Werner complex of a fatty acid.
Claim 13
Dependent Claim
70 words
An opaque release sheet which comprises a substrate having at least one surface coated with a release composition, said release composition comprising a primary release agent consisting essentially of discrete, substantially spherical, air-containing microcapsules and an effective amount of a secondary release agent, said secondary release agent being a member selected from the group consisting of polyethylene, a methoxysilane, a silicone-polyglycol copolymer and a Werner complex of a fatty acid.
Claim 14
Dependent Claim
16 words
A release sheet according to claim 10 wherein said secondary release agent is a silicone-poly-glycol copolymer.
Claim 15
Dependent Claim
12 words
A release sheet according to claim 11 wherein said substrate is paper.
Claim 16
Dependent Claim
21 words
A release sheet according to claim 11 wherein said microcapsules have walls comprising methylcellulose, polyvinyl alcohol, benzylated starch, urea-formaldehyde or melamine-formaldehyde.
Claim 17
Dependent Claim
14 words
A release sheet according to claim 13 wherein said microcapsules have walls comprising urea-formaldehyde.
Claim 18
Dependent Claim
15 words
A release sheet according to claim 13 wherein said microcapsules have walls comprising benzylated starch.
Claim 19
Dependent Claim
35 words
A release sheet according to claim 11 wherein said secondary release agent is present in an amount of between about 1 and about 30 percent by weight of said air-containing microcapsules on a dry basis.
Claim 20
Dependent Claim
100 words
An opaque release sheet which comprises a paper substrate having at least one surface coated with a release composition, said release composition comprising a primary release agent consisting essentially of discrete, substantially spherical, air-containing microcapsules and a secondary release agent in an amount of between about 1 and about 30% by weight of said air-containing microcapsules on a dry basis, said secondary release agent being a member selected from the group consisting of polyethylene, a methoxysilane, a silicone-polyglycol copolymer and a Werner complex of a fatty acid, said microcapsules having walls comprising methylcellulose, polyvinyl alcohol, benzylated starch, urea-formaldehyde or melamineformaldehyde.
Claim 21
Dependent Claim
100 words
An opaque release sheet which comprises a paper substrate having at least one surface coated with a release composition, said release composition comprising a primary release agent consisting essentially of discrete, substantially spherical, air-containing microcapsules and a secondary release agent in an amount of between about 1 and about 30% by weight of said air-containing microcapsules on a dry basis, said secondary release agent being a member selected from the group consisting of polyethylene, a methoxysilane, a silicone-polyglycol copolymer and a Werner complex of a fatty acid, said microcapsules having walls comprising methylcellulose, polyvinyl alcohol, benzylated starch, urea-formaldehyde or melamineformaldehyde.
Claim 22
Dependent Claim
17 words
An opaque release sheet according to claim 17 wherein said secondary release agent is a silicone-polyglycol copolymer.
Claim 23
Dependent Claim
15 words
A release sheet according to claim 17 wherein said microcapsules have walls comprising polyvinyl alcohol.
Claim 24
Dependent Claim
15 words
A release sheet according to claim 17 wherein said secondary release agent is a methoxysilane.
Claim 25
Dependent Claim
16 words
A release sheet according to claim 17 wherein said microcapsules have walls comprising a benzylated starch.
Claim 26
Dependent Claim
14 words
A release sheet according to claim 17 wherein said microcapsules have walls comprising urea-formaldehyde.
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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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |