Patent US974040A successfully refreshed from Google Patents.
Patent US4741965A successfully refreshed from Google Patents.
US4741965A
Expired / Lapsed
US
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Impregnated soft substance gasket
Assignee: Goetze GmbH
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Filing: 1986-12-11
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Granted: 1988-05-03
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Expires: 2006-12-11
Abstract
Abstract A soft substance gasket material preferably made of a metal reinforced fiber mat is impregnated with a silicone impregnating agent comprising a mixture of a polysiloxane having reactive hydrogen groups such as a polyhydrogen siloxane, an addition cross-linking polysiloxane such as a methyl vinyl siloxane, and cross-linking catalysts, preferably in the form of only one organic metal compound. In spite of having small quantities of addition cross-linking polysiloxane and cross-linking catalysts, the impregnated seals are not tacky after cross-linking, they are easy and inexpensive to manufacture, and they evidence improved functional characteristics such as improved resistance to hot media, temperature and aging when compared with seals impregnated with only one type of polysiloxane.
Inventors
- 👤 Hans-Rainer Zerfass
- 👤 Franz-Josef Giesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:40
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/102; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T442/00; Y10T442/20; Y10T442/2926
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
48 words
An impregnated soft substance gasket, obtained by the method of: mixing a liquid polysiloxane resin having reactive hydrogen groups, an addition cross-linking polysiloxane resin and a cross-linking catalyst to form an impregnating agent, and impregnating a soft substance gasket with said impregnating agent and subsequently cross-linking said resins.
Claim 2
Dependent Claim
48 words
An impregnated soft substance gasket, obtained by the method of: mixing a liquid polysiloxane resin having reactive hydrogen groups, an addition cross-linking polysiloxane resin and a cross-linking catalyst to form an impregnating agent, and impregnating a soft substance gasket with said impregnating agent and subsequently cross-linking said resins.
Claim 3
Dependent Claim
16 words
The impregnated soft substance gasket of claim 1, wherein the impregnating agent further comprises cross-linking aids.
Claim 4
Dependent Claim
17 words
The impregnated soft substance gasket of claim 1, wherein the gasket is a metal reinforced fiber mat.
Claim 5
Dependent Claim
24 words
The gasket of claim 1, wherein the addition cross-linking polysiloxane resin is a polysiloxane having double carbon bond groups bound to the silicon atom.
Claim 6
Dependent Claim
40 words
The gasket of claim 1, wherein the cross-linking catalyst is a mixture of platinum complex compounds and organic metal compounds wherein the metal is selected from the group consisting of zinc, tin, cobalt, lead, aluminum, titanium, zirconium and mixtures thereof.
Claim 7
Dependent Claim
36 words
The gasket of claim 1, wherein the cross-linking catalyst is an organic metal compound wherein the metal is selected from the group consisting of zinc, tin, cobalt, lead, aluminum, titanium, and zirconium or a mixture thereof.
Claim 8
Dependent Claim
32 words
The gasket of claim 1, wherein the gasket comprises a mat including fiber material; and further wherein the method comprises adding said cross-linking catalyst into the fiber material while making the mat.
Claim 9
Dependent Claim
31 words
The gasket of claim 1, wherein the gasket comprises a fiber mat; and further wherein the method comprises precipitating said cross-linking catalyst into the fiber mat prior to the impregnating step.
Claim 10
Dependent Claim
50 words
The gasket of claim 1, wherein the liquid polysiloxane resin having reactive hydrogen groups is present in an amount between about 75 and 96 wt % of the composition; and the addition cross-linking polysiloxane resin is present in an amount between about 3 and 20 wt % of the composition.
Claim 11
Dependent Claim
24 words
The gasket of claim 1, wherein the cross-linking catalyst is present in an amount between about 1 and 5 wt % of the composition.
Claim 12
Dependent Claim
33 words
The gasket of claim 1, wherein the polysiloxane resin having reactive hydrogen groups is a methyl hydrogen polysiloxane having a viscosity of between about 15 and 30 mPaS, at room temperature (20° C.).
Claim 13
Dependent Claim
31 words
The gasket of claim 1, wherein the addition cross-linking polysiloxane resin is a methyl vinyl polysiloxane having a viscosity of between about 300 and 600 mPaS, at room temperature (20° C.).
Claim 14
Dependent Claim
40 words
A gasket impregnating agent, comprising about 75 to 96 wt % of a polysiloxane having reactive hydrogen groups; about 3 to 20 wt % of an addition cross-linking polysiloxane; and about 1 to 5 wt % of a cross-linking catalyst.
Claim 15
Dependent Claim
40 words
A gasket impregnating agent, comprising about 75 to 96 wt % of a polysiloxane having reactive hydrogen groups; about 3 to 20 wt % of an addition cross-linking polysiloxane; and about 1 to 5 wt % of a cross-linking catalyst.
Claim 16
Dependent Claim
55 words
The impregnating agent of claim 13, wherein the polysiloxane is methyl hydrogen polysiloxane having a viscosity of about 15 to 30 mPaS, at room temperature (20° C.); the addition cross-linking polysiloxane is methyl vinyl polysiloxane having a viscosity of about 500 mPaS, at room temperature (20° C.); and the cross-linking catalyst is dibutyl tin dilaurate.
Claim 17
Dependent Claim
10 words
The impregnating agent of claim 13, further comprises cross-linking aids.
Claim 18
Dependent Claim
24 words
The impregnating agent of claim 13, wherein the addition cross-linking polysiloxane is a polysiloxane having double carbon bond groups bound to the silicon atom.
Claim 19
Dependent Claim
31 words
The impregnating agent of claim 13, wherein the addition cross-linking polysiloxane is a methyl vinyl polysiloxane having a viscosity of between about 300 and 600 mPa, at room temperature (20° C.).
Claim 20
Dependent Claim
41 words
The impregnating agent of claim 13, wherein the cross-linking catalyst is a mixture of platinum complex compounds and organic metal compounds wherein the metal is selected from the group consisting of zinc, tin, cobalt, lead, aluminum, titanium, zirconium and mixtures thereof.
Claim 21
Dependent Claim
37 words
The impregnating agent of claim 13, wherein the cross-linking catalyst is an organic metal compound wherein the metal is selected from the group consisting of zinc, tin, cobalt, lead, aluminum, titanium, and zirconium or a mixture thereof.
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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) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |