US4546164A
Expired / Lapsed
US
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Process for preparing a one-component organopolysiloxane composition
Assignee: Wacker Chemical Corp
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Filing: 1985-03-11
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Granted: 1985-10-08
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Expires: 2005-03-11
Abstract
Abstract A process for preparing a one-component organopolysiloxane composition which comprises heating a catalyst which is capable of promoting the addition of silicon-bonded hydrogen to aliphatically unsaturated groups in the presence of an organopolysiloxane having aliphatically unsaturated groups and/or a filler at an elevated temperature and thereafter adding an organosilicon compound having silicon-bonded hydrogen to the mixture after it has cooled. The resultant composition, which can be stored at room temperature can be crosslinked by heating to a temperature of about 100° C. or more.
Inventors
- 👤 Ming Shen
- 👤 Richard C. McAfee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:04
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A process for preparing a stable one-component composition which is capable of being cured to an elastomer at an elevated temperature which comprises (A) heating a mixture consisting essentially of a platinum catalyst which is capable of promoting the addition of silicon-bonded hydrogen to silicon-bonded aliphatically unsaturated groups and a filler to a temperature of at least 70° C. and thereafter (B) mixing an organopolysiloxane having a viscosity of at least 100 mPa.s at 25° C. and having an average of at least two silicon-bonded aliphatically unsaturated groups per molecule and an organosilicon compound having at least 2 silicon-bonded hydrogen atoms per molecule with the catalyst-filler mixture at a temperature below that at which crosslinking of the organopolysiloxane will occur.
Claim 2
Dependent Claim
120 words
A process for preparing a stable one-component composition which is capable of being cured to an elastomer at an elevated temperature which comprises (A) heating a mixture consisting essentially of a platinum catalyst which is capable of promoting the addition of silicon-bonded hydrogen to silicon-bonded aliphatically unsaturated groups and a filler to a temperature of at least 70° C. and thereafter (B) mixing an organopolysiloxane having a viscosity of at least 100 mPa.s at 25° C. and having an average of at least two silicon-bonded aliphatically unsaturated groups per molecule and an organosilicon compound having at least 2 silicon-bonded hydrogen atoms per molecule with the catalyst-filler mixture at a temperature below that at which crosslinking of the organopolysiloxane will occur.
Claim 3
Dependent Claim
29 words
The process of claim 1, wherein the filler is present in an amount of from 5 to 200 percent by weight based on the total weight of the organopolysiloxane.
Claim 4
Dependent Claim
46 words
The process of claim 1, wherein the filler and catalyst mixture is heated to a temperature of at least 70° C. and then cooled to at least 60° C. before the organopolysiloxane having silicon-bonded aliphatically unsaturated groups and the organosilicon compound are added to the mixture.
Claim 5
Dependent Claim
54 words
The process of claim 1, wherein a mixture containing filler, organopolysiloxane having an average of at least two silicon-bonded aliphatically unsaturated groups and catalyst is heated to a temperature of at least 70° C. and then the organosilicon compound is added to the mixture at a temperature below that at which cross-linking will occur.
Claim 6
Dependent Claim
65 words
The process of claim 4, wherein a portion of the filler and the organopolysiloxane having silicon-bonded aliphatically unsaturated groups is heated with the catalyst to a temperature of at least 70° C., then the remainder of the filler and the organopolysiloxane having silicon-bonded aliphatically unsaturated groups and the organosilicon compound is added to the mixture at a temperature below that at which crosslinking will occur.
Claim 7
Dependent Claim
28 words
The process of claim 1, wherein composition containing the organopolysiloxane, catalyst, filler and organosilicon compound is heated to a temperature of at least 100° C. to promote cross-linking.
Claim 8
Dependent Claim
26 words
The process of claim 3, wherein the composition containing the organopolysiloxane, filler, catalyst and organosilicon compound is heated to at least 100° C. to promote crosslinking.
Claim 9
Dependent Claim
26 words
The process of claim 4, wherein the composition containing the organopolysiloxane, filler, catalyst and organosilicon compound is heated to at least 100° C. to promote crosslinking.
Claim 10
Dependent Claim
39 words
The process of claim 1, wherein the organopolysiloxane having silicon-bonded aliphatically unsaturated groups is added to the filler-catalyst mixture at an elevated temperature and thereafter the organosilicon compound is added at a temperature below that at which crosslinking occurs.
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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |