US3671485A
Expired / Lapsed
US
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Abhesive coatings comprising polysiboxanes
Assignee: Wacker Chemie AG
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Filing: 1970-07-09
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Granted: 1972-06-20
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Expires: 1990-07-09
Abstract
Abstract An abhesive or release coating for a variety of substrates, particularly paper, is prepared by admixing (1) a hydroxyl endblocked diorganopolysiloxane, (2) a crosslinking alkoxysilane free of amino groups, (3) a crosslinking silane containing amino groups, (4) a tin compound as curing catalyst in (5) an organic solvent. The coating is applied to the substrate and can be cured in the absence of moisture.
Inventors
- 👤 Heinrich Marwitz
- 👤 Siegfried Nitzache
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:42
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/32; C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/20; C08G77/22; C08G77/24; C08G77/26; C08G77/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
The release agent of claim 1 wherein the crosslinking agent (2) is RSi(OR'')3 where R is methyl or vinyl and R'' is ethyl or methoxyethyl.
Claim 2
Dependent Claim
28 words
The release agent of claim 1 wherein the crosslinking agent (2) of the general formula RSi(OR'')3 is present in prOportions of from 20 to 30 parts by weight.
Claim 3
Dependent Claim
23 words
The release agent of claim 1 wherein the diorganopolysiloxane (1) is a gum-like material having a viscosity exceeding 1,000,000 cs. at 25* C.
Claim 4
Dependent Claim
67 words
The release agent of claim 1 wherein the crosslinking amino containing silicon compounds (3) are defined by the formula R4Si(OR3)3 where each R3 is a hydrocarbyl or substituted hydrocarbyl radical and each R4 is a hydrocarbyl radical bonded to silicon through Si-C bonding, containing at least one amino group or a hydrocarbonoxyhydrocarbyl radical containing at least one amino group and bonded to silicon through an Si-C bonding.
Claim 5
Dependent Claim
35 words
The release agent of claim 1 wherein the crosslinking amino containing silicon compounds are of the general formula R2Si(NHR5)3 where R2 is a hydrocarbyl or substituted hydrocarbyl radical and each R5 is a hydrocarbyl radical.
Claim 6
Dependent Claim
13 words
The release agent of claim 1 wherein the tin catalyst is a diorganotindiacylate.
Claim 7
Dependent Claim
15 words
The release agent of claim 7 wherein the tin catalyst is dibutyltindilaurate, dioctyltindimaleinate or dibutyltin-di-2-ethylhexoate.
Claim 8
Dependent Claim
19 words
The release agent of claim 1 wherein the organic solvent is a hydrocarbon, halogenohydrocarbon, ether, ester, alcohol or ketone.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |