US4533600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealant sheet material
Assignee: Loparex Inc
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Filing: 1984-04-26
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Granted: 1985-08-06
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Expires: 2004-04-26
Abstract
Abstract A low cost sheet material, and a method of preparing same, which is useful as a substrate for casting sealants and adhesives. The substrate comprises a highly calendered, smooth grade kraft paper having a coating of an elastomer modified polyvinyl chloride on each of the major surfaces thereof. Either one, or both, of the polyvinyl coatings are provided with a film of a release agent thereon.
Inventors
- 👤 Raymond T. Coughlan
- 👤 Suzette M. Bojarski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:42
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/80; D21H19/84; C; C09; C09J; C09J7/00; C09J7/20; C09J7/21; C09J2400/00; C09J2400/20; C09J2400/28; C09J2400/283; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839; Y10T428/2848; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
A low cost sheet material adapted for use as a substrate on which to cast sealants or adhesives, comprising: a supporting base layer formed of a highly calendered, smooth grade kraft paper; a continuous coating of a resin composition on each of the main surface areas of the kraft paper base layer, said resin composition consisting essentially of a nitrile rubber modified polyvinyl chloride; and a continuous film of a silicone release agent on the surface of at least one of said coatings of the resin composition.
Claim 2
Dependent Claim
87 words
A low cost sheet material adapted for use as a substrate on which to cast sealants or adhesives, comprising: a supporting base layer formed of a highly calendered, smooth grade kraft paper; a continuous coating of a resin composition on each of the main surface areas of the kraft paper base layer, said resin composition consisting essentially of a nitrile rubber modified polyvinyl chloride; and a continuous film of a silicone release agent on the surface of at least one of said coatings of the resin composition.
Claim 3
Dependent Claim
40 words
A sheet material according to claim 1 wherein the kraft paper base layer has a Sheffield Smoothness of less than about 350, and a penetration resistance between about 10 and about 40 seconds as measured on a Hercules Sizing Tester.
Claim 4
Dependent Claim
32 words
A sheet material according to claim 1 wherein the kraft paper base layer is a converting smooth grade kraft paper having a basis of about 25 to about 100 pounds per ream.
Claim 5
Dependent Claim
34 words
A sheet material according to claim 1 wherein the loading of the resin composition coating on the base layer is about 2 to about 6 pounds per ream per side of the base layer.
Claim 6
Dependent Claim
18 words
A sheet material according to claim 1 wherein the nitrile rubber is a copolymer of butadiene and acrylonitrile.
Claim 7
Dependent Claim
20 words
A sheet material according to claim 1 wherein a minor amount of an extender is incorporated into the resin composition.
Claim 8
Dependent Claim
25 words
A sheet material according to claim 1 wherein a minor amount of an epoxy resin and a U.V. stabilizer are incorporated into the resin composition.
Claim 9
Dependent Claim
27 words
A sheet material according to claim 7 wherein the extender is selected from the group consisting of crosslinked starch, a polyacrylate, and polyvinyl alcohol, and mixtures thereof.
Claim 10
Dependent Claim
25 words
A sheet material according to claim 1 wherein said at least one film of a release agent is formed from an emulsion of an organopolysiloxane.
Claim 11
Dependent Claim
52 words
A sheet material according to claim 1 wherein a film of a silicone release agent is provided on each of the resin composition coatings, the release agent film on one of said coatings having a different release character than that of the film of release agent on the other of said coatings.
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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |