US4609589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Release sheet
Assignee: New Oji Paper Co Ltd
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Filing: 1985-01-14
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Granted: 1986-09-02
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Expires: 2005-01-14
Abstract
Abstract A one-faced or double-faced release sheet presenting an adequate barrier against coating solutions of release agent, good adhesion to release agents, high heat resistance and minimum heat shrinkage comprising a support sheet having a release layer formed on at least one side thereof with an undercoated layer being disposed between said support sheet and the release layer, said undercoated layer being formed from a mixture of a soap-free type acrylic resin emulsion and oxidized starch.
Inventors
- 👤 Yukio Hosoda
- 👤 Hiro Ohtsubo
- 👤 Hiroyuki Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:14
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B15/00; B32B15/04; B32B15/12; B32B15/08; B32B15/098; B32B15/20; C; C09; C09J; C09J7/00; C09J7/40; C09J7/403; D; D21; D21H; D21H19/00; D21H19/80; D21H19/82; D21H19/824; B32B2398/00; B32B2398/10; B32B2405/00; C09J2400/00; C09J2400/10; C09J2400/16; C09J2400/163; C09J2400/20; C09J2400/22; C09J2400/226; C09J2400/28; C09J2400/283; C09J2401/00; C09J2401/006; C09J2433/00; C09J2433/005; C09J2479/00; C09J2479/02; C09J2479/026; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1438; Y10T428/1443; Y10T428/28; Y10T428/2839; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31678; Y10T428/31681; Y10T428/31688; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31859; Y10T428/31862; Y10T428/31866; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
50 words
A release sheet comprising a support sheet having a release layer formed on at least one side thereof with an undercoated layer being disposed between said support sheet and the release layer, said undercoated layer being formed from a mixture of a soap-free type acrylic resin emulsion and oxidized starch.
Claim 2
Dependent Claim
50 words
A release sheet comprising a support sheet having a release layer formed on at least one side thereof with an undercoated layer being disposed between said support sheet and the release layer, said undercoated layer being formed from a mixture of a soap-free type acrylic resin emulsion and oxidized starch.
Claim 3
Dependent Claim
19 words
A release sheet according to claim 1 wherein the material for the undercoated layer further contains a melamine-formaldehyde resin.
Claim 4
Dependent Claim
18 words
A release sheet according to claim 1 wherein said support sheet is made of a cellulosic sheet material.
Claim 5
Dependent Claim
14 words
A release sheet according to claim 3 wherein the cellulosic sheet material is paper.
Claim 6
Dependent Claim
15 words
A release sheet according to claim 1 wherein the support sheet is a polymeric film.
Claim 7
Dependent Claim
15 words
A release sheet according to claim 1 wherein the support sheet is a metal foil.
Claim 8
Dependent Claim
15 words
A release sheet according to claim 6 wherein the metal foil is an aluminum foil.
Claim 9
Dependent Claim
20 words
A release sheet according to claim 1 wherein the support sheet is a lamination of paper and an aluminum foil.
Claim 10
Dependent Claim
88 words
A double-faced release sheet having a coating of release agent formed on both surfaces of a support made of a lamination of a base sheet and a metal foil, said release sheet having an undercoated layer between each surface of the support and the release agent coating, the undercoated layer on the base sheet side being a layer principally made of a soap-free type acrylic resin emulsion whereas the undercoated layer on the metal foil side is a layer principally made of a cross-linking product of thermosetting resins.
Claim 11
Dependent Claim
88 words
A double-faced release sheet having a coating of release agent formed on both surfaces of a support made of a lamination of a base sheet and a metal foil, said release sheet having an undercoated layer between each surface of the support and the release agent coating, the undercoated layer on the base sheet side being a layer principally made of a soap-free type acrylic resin emulsion whereas the undercoated layer on the metal foil side is a layer principally made of a cross-linking product of thermosetting resins.
Claim 12
Dependent Claim
20 words
A double-faced release paper according to claim 9 wherein the undercoated layer on the base sheet further contains oxidized starch.
Claim 13
Dependent Claim
25 words
A double-faced release sheet according to claim 9 wherein the material for the undercoated layer on the base sheet side further contains a melamine-formaldehyde resin.
Claim 14
Dependent Claim
28 words
A double-faced release sheet according to claim 9 wherein the cross-linking reaction product of thermosetting resins is a cross-linking reaction product of a polyester resin and alkylated melamine.
Claim 15
Dependent Claim
26 words
A double-faced release sheet according to claim 9 wherein the cross-linking reaction product of thermosetting resins is a cross-linking reaction product of epoxide and alkylated melamine.
Claim 16
Dependent Claim
28 words
A double-faced release sheet according to claim 9 wherein the cross-linking reaction product of thermosetting resin is a cross-linking reaction product of epoxide and a polyvinyl phenolic resin.
Claim 17
Dependent Claim
19 words
A double-faced release sheet according to claim 9 wherein said base sheet is made of a cellulosic sheet material.
Claim 18
Dependent Claim
16 words
A double-faced release sheet according to claim 9 wherein said base sheet is made of paper.
Claim 19
Dependent Claim
16 words
A double-faced release sheet according to claim 9 wherein said metal foil is an aluminum foil.
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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |