US5108782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone release composition
Assignee: Magnera Corp
•
Filing: 1991-07-08
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Granted: 1992-04-28
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Expires: 2011-07-08
Abstract
Abstract A silicone release coating emulsion includes a reactive crosslinkable silicone, a catalyst and a high molecular weight, water soluble or water dispersible polymeric thickening agent such as polyethylene oxide. The polymeric thickening agent has a molecular weight greater than about 100,000 g/mole Mw. The silicone release emulsion is applied as a coating to a substrate, and particularly paper, and cured to form a release coating for pressure sensitive adhesives. The silicone emulsion exhibits improved holdout of the silicone from the substrate.
Inventors
- 👤 W. Michael Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:38
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/04; D21H25/06; C; C08; C08L; C08L83/00; C08L83/04; C09; C09J; C09J7/00; C09J7/40; C09J7/401; D21H19/00; D21H19/10; D21H19/14; D21H19/20; D21H19/24; D21H19/32; D21H19/34; D21H19/80; D21H19/82; D21H19/826; C08G; C08G77/00; C08G77/04; C09J2301/00; C09J2301/40; C09J2301/416; C09J2463/00; C09J2463/005; C09J2483/00; C09J2483/005; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
162 words
A process of forming a silicone release coating and increasing silicone holdout on a substrate, comprising a) applying a coating of a release composition of an aqueous emulsion to a substrate, wherein the aqueous emulsion contains from about 10% to 98% of at least one curable silicone for forming a release coating, an effective amount of a silicone crosslinking catalyst and about 0.01% to about 30% of at least one polymeric thickening agent capable of promoting silicone holdout on a substrate, wherein said thickening agent is soluble or partially soluble in water at room temperature and is a substantially linear aliphatic polymer having a weight average molecular weight of at least about 100,000 g/mole wherein said percentages are by weight actives based on the total weight of the actives in the emulsion, and wherein said linear aliphatic polymer is selected from the group consisting of polyacrylamides, polypropylene oxide, polyethylene oxides, and polyethylene oxide-polypropylene oxide copolymers; and b) drying and curing the coating.
Claim 2
Dependent Claim
162 words
A process of forming a silicone release coating and increasing silicone holdout on a substrate, comprising a) applying a coating of a release composition of an aqueous emulsion to a substrate, wherein the aqueous emulsion contains from about 10% to 98% of at least one curable silicone for forming a release coating, an effective amount of a silicone crosslinking catalyst and about 0.01% to about 30% of at least one polymeric thickening agent capable of promoting silicone holdout on a substrate, wherein said thickening agent is soluble or partially soluble in water at room temperature and is a substantially linear aliphatic polymer having a weight average molecular weight of at least about 100,000 g/mole wherein said percentages are by weight actives based on the total weight of the actives in the emulsion, and wherein said linear aliphatic polymer is selected from the group consisting of polyacrylamides, polypropylene oxide, polyethylene oxides, and polyethylene oxide-polypropylene oxide copolymers; and b) drying and curing the coating.
Claim 3
Dependent Claim
15 words
The process of claim 1 comprising drying the coated substrate before curing the release compositions.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the silicone is a heat curable silicone and wherein the release composition is cured by heating.
Claim 5
Dependent Claim
38 words
The process of claim 1 wherein the silicone is curable by U.V. radiation and the release composition is cured by subjecting the coated substrate to U.V. radiation for a period of time effective to cure the release composition.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the catalyst is selected from the group consisting of platinum, rhodium, tin, zinc and complexes thereof.
Claim 7
Dependent Claim
44 words
The process of claim 1 wherein the catalyst is present in the amount of about 1% to 10% by weight based on the total weight of actives in the emulsion and is an aqueous emulsion of a silicone crosslinking agent and a metal catalyst.
Claim 8
Dependent Claim
29 words
The process of claim 1 wherein the release composition further includes a thickening agent selected from the group consisting of carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose.
Claim 9
Dependent Claim
19 words
The process of claim 3 wherein the silicone is cured by heating to about 200° F to 400° F.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein the substrate is selected from the group consisting of paper, paper board, glass, metal, polyethylene, and polyester films.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein the substrate is paper precoated with clay.
Claim 12
Dependent Claim
33 words
The process of claim 1 wherein said silicone release coating is applied by a coating means selected from the group consisting of a trailing blade coater, bent blade, rod and short dwell coaters.
Claim 13
Dependent Claim
10 words
The coated substrate formed by the process of claim 1.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein said linear aliphatic polymer has a molecular weight of at least 500,000 g/mole.
Claim 15
Dependent Claim
19 words
The process of claim 1 wherein said linear aliphatic polymer has a molecular weight of at least 1,000,000 g/mole.
Claim 16
Dependent Claim
22 words
The process of claim 1 wherein said linear aliphatic polymer has a molecular weight of about 1,000,000 g/mole to about 5,000,000 g/mole.
Claim 17
Dependent Claim
146 words
A process of promoting silicone holdout in a silicone release coating on a substrate, comprising a) applying a coating of a silicone release composition on a substrate, wherein said silicone release composition is an aqueous emulsion comprising from about 10% to 98% of at least one curable silicone capable of forming a silicone release coating, an effective amount of a silicone crosslinking catalyst to crosslink said silicone, and about 0.01% to about 30% of a silicone holdout promoting linear aliphatic polymer which is water soluble or partially soluble in water at room temperature and has a weight average molecular weight of at least 100,000 g/mole, wherein said percentages are by weight actives based on the total weight of the actives in the emulsion, and wherein said linear aliphatic polymer is selected from the group consisting of polyacrylamides, polypropylene oxide, polyethylene oxide, and polyethylene oxide-polypropylene oxide copolymers.
Claim 18
Dependent Claim
146 words
A process of promoting silicone holdout in a silicone release coating on a substrate, comprising a) applying a coating of a silicone release composition on a substrate, wherein said silicone release composition is an aqueous emulsion comprising from about 10% to 98% of at least one curable silicone capable of forming a silicone release coating, an effective amount of a silicone crosslinking catalyst to crosslink said silicone, and about 0.01% to about 30% of a silicone holdout promoting linear aliphatic polymer which is water soluble or partially soluble in water at room temperature and has a weight average molecular weight of at least 100,000 g/mole, wherein said percentages are by weight actives based on the total weight of the actives in the emulsion, and wherein said linear aliphatic polymer is selected from the group consisting of polyacrylamides, polypropylene oxide, polyethylene oxide, and polyethylene oxide-polypropylene oxide copolymers.
Claim 19
Dependent Claim
19 words
The process of claim 16 wherein said linear aliphatic polymer has a molecular weight of at least 500,000 g/mole.
Claim 20
Dependent Claim
19 words
The process of claim 16 wherein said linear aliphatic polymer has a molecular weight of at least 1,000,000 g/mole.
Claim 21
Dependent Claim
22 words
The process of claim 16 wherein said linear aliphatic polymer has a molecular weight of about 1,000,000 g/mole to about 3,000,000 g/mole.
Claim 22
Dependent Claim
139 words
A process of forming a silicone release coating and increasing silicone holdout on a substrate, comprising: a) applying a coating of a release composition of an aqueous emulsion to a substrate, wherein the aqueous emulsion contains from about 10% to 98% of at least one curable silicone for forming a release coating, an effective amount of a silicone crosslinking catalyst and about 0.01% to about 30% of at least one polymeric thickening agent capable of promoting silicone holdout on a substrate, wherein said thickening agent is soluble or partially soluble in water at room temperature and is a substantially linear aliphatic polymer having a weight average molecular weight of at least about 500,000 g/mole, wherein said percentages are by weight actives based on the total weight of the actives in the emulsion; and b) drying and curing the coating.
Claim 23
Dependent Claim
139 words
A process of forming a silicone release coating and increasing silicone holdout on a substrate, comprising: a) applying a coating of a release composition of an aqueous emulsion to a substrate, wherein the aqueous emulsion contains from about 10% to 98% of at least one curable silicone for forming a release coating, an effective amount of a silicone crosslinking catalyst and about 0.01% to about 30% of at least one polymeric thickening agent capable of promoting silicone holdout on a substrate, wherein said thickening agent is soluble or partially soluble in water at room temperature and is a substantially linear aliphatic polymer having a weight average molecular weight of at least about 500,000 g/mole, wherein said percentages are by weight actives based on the total weight of the actives in the emulsion; and b) drying and curing the coating.
Claim 24
Dependent Claim
19 words
The process of claim 20 wherein said linear aliphatic polymer has a molecular weight of at least 1,000,000 g/mole.
Claim 25
Dependent Claim
22 words
The process of claim 20 wherein said linear aliphatic polymer has a molecular weight of about 1,000,000 g/mole to about 5,000,000 g/mole.
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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) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |