US4170700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for accelerating surface curing of organopolysiloxane compositions
Assignee: Wacker Chemical Corp
•
Filing: 1978-04-26
•
Granted: 1979-10-09
•
Expires: 1998-04-26
Abstract
Abstract A method for accelerating the surface curing of a room temperature vulcanizable organopolysiloxane composition which comprises contacting the organopolysiloxane composition with carbon dioxide in excess of that present in the atmosphere.
Inventors
- 👤 Edward Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:14
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/20; C08G77/22; C08G77/24; C08G77/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A method for accelerating surface curing of a composition which is vulcanizable at room temperature in the presence of atmospheric moisture which comprises exposing a composition containing hydroxyl terminated organopolysiloxanes and an aminosilicon compound selected from the group consisting of aminosilanes of the formula R".sub.z Si(NY.sub.2).sub.4-z and aminosilazanes of the formula (Y.sub.2 N).sub.a R".sub.b SiNH[R".sub.b (Y.sub.2 N).sub.c SiNH].sub.g SiR".sub.b (NY.sub.2).sub.a in which R" is selected from the group consisting of alkyl, aryl, aralkyl and alkaryl radicals, Y is selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, alkaryl and aralkyl radicals, z is 0 or 1, g is at least 1, a is 2 or 3, b is 0 or 1 and c is 1 or 2 to a gaseous medium containing moisture and carbon dioxide in which the carbon dioxide is present in an amount of at least 0.1 percent by volume.
Claim 2
Independent Claim
144 words
A method for accelerating surface curing of a composition which is vulcanizable at room temperature in the presence of atmospheric moisture which comprises exposing a composition containing hydroxyl terminated organopolysiloxanes and an aminosilicon compound selected from the group consisting of aminosilanes of the formula R".sub.z Si(NY.sub.2).sub.4-z and aminosilazanes of the formula (Y.sub.2 N).sub.a R".sub.b SiNH[R".sub.b (Y.sub.2 N).sub.c SiNH].sub.g SiR".sub.b (NY.sub.2).sub.a in which R" is selected from the group consisting of alkyl, aryl, aralkyl and alkaryl radicals, Y is selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, alkaryl and aralkyl radicals, z is 0 or 1, g is at least 1, a is 2 or 3, b is 0 or 1 and c is 1 or 2 to a gaseous medium containing moisture and carbon dioxide in which the carbon dioxide is present in an amount of at least 0.1 percent by volume.
Claim 3
Dependent Claim
61 words
The method of claim 1, wherein the hydroxyl terminated organopolysiloxanes are represented by the formula ##EQU2## wherein R is selected from the group consisting of monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, x has an average value of 0.99 to 1.01, y has an average value of 1.99 to 2.01, x+y=3 and n is a number of at least 3.
Claim 4
Dependent Claim
34 words
The method of claim 1, wherein the hydroxyl terminated organopolysiloxanes are modified organopolysiloxanes which are obtained by polymerizing an organic monomer in the presence of a hydroxyl terminated diorganopolysiloxane and a free radical initiator.
Claim 5
Dependent Claim
27 words
The method of claim 1, wherein the carbon dioxide is present in the gaseous medium in an amount of from 0.2 to about 50 percent by volume.
Claim 6
Dependent Claim
57 words
The method of claim 1, wherein the amino substituted organosilicon compound is an aminosilane of the formula R".sub.z Si(NY.sub.2).sub.4-z in which R" is selected from the group consisting of alkyl, aryl, aralkyl and alkaryl radicals, Y is selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, alkaryl and aralkyl radicals, and z is 0 or 1.
Claim 7
Dependent Claim
11 words
The method of claim 5 wherein the aminosilane is an alkyl-tris:(cyclohexylamino)silane.
Claim 8
Dependent Claim
10 words
The method of claim 6 wherein the aminosilane is methyltris-(cyclohexylamino)silane.
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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |