US3624017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast curing siloxane release emulsions
Assignee: Dow Silicones Corp
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Filing: 1969-11-24
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Granted: 1971-11-30
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Expires: 1989-11-24
Abstract
Abstract Emulsion copolymers of from 80 to 98 mol. percent dimethylsiloxane and from 2 to 20 mol. percent RSiO3/2 will cure on substrates under the influence of SiOH condensation catalysts in 30 seconds or less at 200* F. to give release values of less than 50 g. per inch. For example, an emulsion of a copolymer made by emulsion copolymerizing cyclic dimethylsiloxanes and methyltrimethoxysilane in amount to give 96 mol. percent dimethylsiloxanes and 4 mol. percent monomethylsiloxane will cure on paper in 20 seconds at 200* F. to give a release to J and J adhesive tape of 26 g. per inch.
Inventors
- 👤 Martin E Sorkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:25
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/32; D21H27/00; D21H27/001
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
14 words
The emulsion of claim 1 in which R is methyl and X is methoxy.
Claim 2
Dependent Claim
20 words
The emulsion of claim 1 which contains a SiOH condensation catalyst effective for curing the copolymer under the specified conditions.
Claim 3
Dependent Claim
20 words
The emulsion of claim 2 which contains a SiOH condensation catalyst effective for curing the copolymer under the specified conditions.
Claim 4
Dependent Claim
16 words
The emulsion of claim 2 in which the catalyst is a carboxylic acid salt of tin.
Claim 5
Dependent Claim
18 words
The emulsion of claim 1 in which RSiO3/2 is present in amount of 3 to 15 mol. percent.
Claim 6
Dependent Claim
19 words
The emulsion of claim 5 in which CH3 SiO3/2 is present in amount of 3 to 15 mol. percent.
Claim 7
Dependent Claim
18 words
The emulsion of claim 2 in which CH3SiO3/2 is present in amount of 2 to 15 mol. percent.
References Cited (Backward Citations)
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Cited
US2985544A
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US3061567A
Cited
US3389102A
Cited
US3294725A
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Cited
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |