Patent US3897376A successfully refreshed from Google Patents.
US3897376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Room temperature vulcanizable silicone rubber composition
Assignee: General Electric Co
•
Filing: 1972-03-17
•
Granted: 1975-07-29
•
Expires: 1992-03-17
Abstract
Abstract A room temperature vulcanizable silicone rubber composition comprising (a) a high molecular weight liquid diorganopolysiloxane having terminal hydroxy groups bonded to the silicon atom and a viscosity of 3 X 106 to 2 X 108 centipoise at 25*C, (b) 0-60 percent by weight of said high molecular weight organopolysiloxane of a low molecular weight liquid organopolysiloxane having terminal hydroxy groups bonded to the silicon atoms and a viscosity of 100 to 3.0 X 105 centipoise at 25*C. There is also present a filler and an alkyl silicate which acts as the cross-linking agent during curing of the composition. As a catalyst there is used a metallic salt of an organic monocarboxylic acid. The composition may be mixed and placed in the ear canal to form an ear plug in situ.
Inventors
- 👤 Warren R Lampe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:40
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; A; A61; A61F; A61F11/00; A61F11/06; A61F11/08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; Y; Y10; Y10S; Y10S264/00; Y10S264/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
7 words
THE PROCESS FOR OBTAINING SILICONE RUBBER COMPOSITIONS
Claim 2
Dependent Claim
7 words
THE PROCESS FOR OBTAINING SILICONE RUBBER COMPOSITIONS
Claim 3
Dependent Claim
150 words
PROCESS FOR THE MANUFACTURE OF THERMOSETTING SYNTHETIC RESINS WITH URETHANE GROUPS, WHICH CONTAIN CARBOXYL GROUPS WHICH ARE CURED AT ROOM TEMPERATURES TO THE SOLID, ELASTIC STATE COMPRISING MIXING A. A LINER HIGH MOLECULAR WEIGHT FLUID ORGANOPOLYSILOXANE CONTAINING TERMINAL SILICON-BONED HYDROXY GROUPS AND HAVING A VISCOSITY OF 3 X 10**6 TO 2 X 10**8 CENTIPOISE AT 25*C WHERE THE ORGANO GROUPS ARE MONOVALENT HYDROCARBON RADICALS WITH 1-100% BY WEIGHT OF HIGH MOLECULAR WEIGHT DIORGANOPOLYSILOXANE OF A LOW MOLECULAR WEIGHT LINEAR FLUID DIORGANOPOLYSILOXANE CONTAINING TERMINAL SILICONBONDED HYDROXY GROUPS AND HAVING A VISCOSITY OF 100 TO 3.0 X 10**5 CENTIPOISE AT 25*C WHERE THE ORGANO GROUPS REPRESENT MONOVALENT HYDROCARBON GROUPS, B. DISPERSING INTO THE ORGANOPOLYSILOXANE MIXTURE 10-50 PERCENT BY WEIGHT OF FILLER BASED ON THE WEIGHT OF ORGANOPOLYSILOXANE MIXTURE, C. MIXING IN THE ABOVE MIXTURE AND ALKYL SILICATE SELECTED FROM THE CLASS CONSISTING OF (1) A MONOMERIC ORGANO-SILICATE CORRESPONDING TO THE GENERAL FORMULA,
Claim 4
Dependent Claim
150 words
PROCESS FOR THE MANUFACTURE OF THERMOSETTING SYNTHETIC RESINS WITH URETHANE GROUPS, WHICH CONTAIN CARBOXYL GROUPS WHICH ARE CURED AT ROOM TEMPERATURES TO THE SOLID, ELASTIC STATE COMPRISING MIXING A. A LINER HIGH MOLECULAR WEIGHT FLUID ORGANOPOLYSILOXANE CONTAINING TERMINAL SILICON-BONED HYDROXY GROUPS AND HAVING A VISCOSITY OF 3 X 10**6 TO 2 X 10**8 CENTIPOISE AT 25*C WHERE THE ORGANO GROUPS ARE MONOVALENT HYDROCARBON RADICALS WITH 1-100% BY WEIGHT OF HIGH MOLECULAR WEIGHT DIORGANOPOLYSILOXANE OF A LOW MOLECULAR WEIGHT LINEAR FLUID DIORGANOPOLYSILOXANE CONTAINING TERMINAL SILICONBONDED HYDROXY GROUPS AND HAVING A VISCOSITY OF 100 TO 3.0 X 10**5 CENTIPOISE AT 25*C WHERE THE ORGANO GROUPS REPRESENT MONOVALENT HYDROCARBON GROUPS, B. DISPERSING INTO THE ORGANOPOLYSILOXANE MIXTURE 10-50 PERCENT BY WEIGHT OF FILLER BASED ON THE WEIGHT OF ORGANOPOLYSILOXANE MIXTURE, C. MIXING IN THE ABOVE MIXTURE AND ALKYL SILICATE SELECTED FROM THE CLASS CONSISTING OF (1) A MONOMERIC ORGANO-SILICATE CORRESPONDING TO THE GENERAL FORMULA,
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the organo groups attached to said diorganopolysiloxanes are methyl groups.
Claim 6
Dependent Claim
34 words
The process of claim 2 wherein the alkyl silicate is polyethylsilicate and is present in an amount of 0.1 to 15 percent by weight of said high molecular weight and low molecular weight organopolysiloxanes.
Claim 7
Dependent Claim
39 words
The process of claim 3 wherein the metallic salt is used in the concentration of 0.1 to 5 percent by weight of the high molecular weight and low molecular weight diorganopolysiloxanes and said metallic salt is dibutyl tin dilaurate.
Claim 8
Dependent Claim
25 words
The process of claim 4 wherein the high molecular weight organopolysiloxane has a viscosity of 3 X 106 to 4.5 X 106 centipoise at 25*C.
Claim 9
Dependent Claim
56 words
The process of claim 4 wherein the blend of the low molecular weight organopolysiloxane and high molecular weight organopolysiloxane has a viscosity of 3 X 106 to 4.5 X 106 centipoise at 25*C and wherein the mixture of organopolysiloxanes with said filler has a viscosity of 15 X 106 to 25 X 106 centipoise at 25*C.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |