Patent US1190664A successfully refreshed from Google Patents.
Patent US3028587A successfully refreshed from Google Patents.
Patent US5692152A successfully refreshed from Google Patents.
Patent US2407772A successfully refreshed from Google Patents.
Patent US2651318A successfully refreshed from Google Patents.
Patent US3671485A successfully refreshed from Google Patents.
US3671485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abhesive coatings comprising polysiboxanes
Assignee: Wacker Chemie AG
•
Filing: 1970-07-09
•
Granted: 1972-06-20
•
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
2026-11-01 16:54
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 |