US4460740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing surface stain of cured silicone sealant
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1983-03-18
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Granted: 1984-07-17
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Expires: 2003-03-18
Abstract
Abstract The invention provides a novel means for solving the serious problem in conventional silicone sealant compositions that the surface of the cured sealant composition, when used for sealing or caulking of a joint in building structures of, in particular, stony components, is susceptible to stain from environmental atmosphere eventually spreading over the adjacent surfaces. The invention proposes admixing a limited amount of a specific fluorine-containing surface active agent with the silicone sealant composition before it is applied for sealing or caulking.
Inventors
- 👤 Masatoshi Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:29
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/19; C08K5/20; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A silicone sealant composition insusceptible to stain on the surface of a cured rubbery elastomer thereof which comprises: (a) 100 parts by weight of a diorganopolysiloxane blocked at both molecular chain ends each with a hydroxy group directly bonded to the silicon atom; (b) from 0.1 to 25 parts by weight of an organosilicon compound having at least 2 hydrolyzable groups bonded to the silicon atoms per molecule on an average; (c) from 1 to 400 parts by weight of a filler; (d) optionally, up to 5 parts by weight of a curing catalyst, and (e) from 0.01 to 5.0 parts by weight, per 100 parts by weight of the total amount of the components (a) to (d) above, of a surface active agent having, in a molecule, at least one fluorine atom.
Claim 2
Dependent Claim
133 words
A silicone sealant composition insusceptible to stain on the surface of a cured rubbery elastomer thereof which comprises: (a) 100 parts by weight of a diorganopolysiloxane blocked at both molecular chain ends each with a hydroxy group directly bonded to the silicon atom; (b) from 0.1 to 25 parts by weight of an organosilicon compound having at least 2 hydrolyzable groups bonded to the silicon atoms per molecule on an average; (c) from 1 to 400 parts by weight of a filler; (d) optionally, up to 5 parts by weight of a curing catalyst, and (e) from 0.01 to 5.0 parts by weight, per 100 parts by weight of the total amount of the components (a) to (d) above, of a surface active agent having, in a molecule, at least one fluorine atom.
Claim 3
Dependent Claim
33 words
The silicone sealant composition as claimed in claim 1 wherein the surface active agent as the component (e) is an amphoteric surface active agent having, in a molecule, at least one fluorine atom.
Claim 4
Dependent Claim
48 words
The silicone sealant composition as claimed in claim 2 wherein the amphoteric surface active agent is a compound represented by the general formula ##STR13## in which R is a monovalent organic group, l and m are each zero or a positive integer and n is a positive integer.
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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |