US4273634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precured silicone emulsion and method for preparation
Assignee: Dow Silicones Corp
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Filing: 1979-11-14
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Granted: 1981-06-16
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Expires: 1999-11-14
Abstract
Abstract An aqueous silicone emulsion is described which provides an elastomeric product upon removal of the water under ambient conditions. The emulsion comprises a continuous water phase and a dispersed phase of crosslinked silicone. The silicone phase is the product of radical produced crosslinking of hydroxyl endblocked polydiorganosiloxane. The polydiorganosiloxane is crosslinked after it has been dispersed in water. Preferred polydiorganosiloxanes contain vinyl-substituted siloxane units and can be crosslinked by high energy radiation or the combined action of heat and an organic peroxide.
Inventors
- 👤 John C. Saam
- 👤 Robert L. Wegener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:24
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/045; C08G77/14; C08G77/16; C08G77/20; C08G77/42; C08G77/44; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
An aqueous silicone emulsion which provides an elastomeric product upon removal of the water under ambient conditions, comprising a continuous water phase and a dispersed phase of crosslinked silicone prepared by (A) first forming a stabilized dispersion of hydroxyl endblocked polydiorganosiloxane in water, the polydiorganosiloxane containing sufficient vinyl-substituted siloxane units to facilitate the crosslinking of the polydiorganosiloxane and having a weight average molecular weight of at least 5,000, and then (B) treating the dispersion to provide a crosslinking action by forming radicals within the dispersed polydiorganosiloxane.
Claim 2
Dependent Claim
86 words
An aqueous silicone emulsion which provides an elastomeric product upon removal of the water under ambient conditions, comprising a continuous water phase and a dispersed phase of crosslinked silicone prepared by (A) first forming a stabilized dispersion of hydroxyl endblocked polydiorganosiloxane in water, the polydiorganosiloxane containing sufficient vinyl-substituted siloxane units to facilitate the crosslinking of the polydiorganosiloxane and having a weight average molecular weight of at least 5,000, and then (B) treating the dispersion to provide a crosslinking action by forming radicals within the dispersed polydiorganosiloxane.
Claim 3
Dependent Claim
26 words
The aqueous silicone emulsion according to claim 1 in which the radicals are formed within the dispersed polydiorganosiloxane by exposing the dispersion to high energy radiation.
Claim 4
Dependent Claim
28 words
The aqueous silicone emulsion according to claim 1 in which the radicals are formed within the dispersed polydiorganosiloxane by the combined action of heat and a radical-producing agent.
Claim 5
Dependent Claim
22 words
The silicone emulsion according to claim 2 or 3 in which the polydiorganosiloxane is a copolymer containing dimethylsiloxane units and methylvinylsiloxane units.
Claim 6
Dependent Claim
21 words
The silicone emulsion according to claim 4 in which the copolymer has a weight average molecular weight of 200,000 to 700,000.
Claim 7
Dependent Claim
27 words
The silicone emulsion according to claim 2 or 3 in which the hydroxyl endblocked polydiorganosiloxane is an anionic emulsion polymerized copolymer of dimethylsiloxane units and methylvinylsiloxane units.
Claim 8
Dependent Claim
15 words
The silicone emulsion according to claim 1 in which there is also present a filler.
Claim 9
Independent Claim
77 words
A method of preparing an aqueous silicone emulsion which provides an elastomeric product upon removal of the water under ambient conditions comprising (A) first forming a stabilized dispersion of hydroxyl endblocked polydiorganosiloxane in water, the polydiorganosiloxane containing sufficient vinyl-substituted siloxane units to facilitate the crosslinking of the polydiorganosiloxane, and having a weight average molecular weight of at least 5,000, and then (B) treating the dispersion to provide a crosslinking action by forming radicals within the dispersed polydiorganosiloxane.
Claim 10
Independent Claim
77 words
A method of preparing an aqueous silicone emulsion which provides an elastomeric product upon removal of the water under ambient conditions comprising (A) first forming a stabilized dispersion of hydroxyl endblocked polydiorganosiloxane in water, the polydiorganosiloxane containing sufficient vinyl-substituted siloxane units to facilitate the crosslinking of the polydiorganosiloxane, and having a weight average molecular weight of at least 5,000, and then (B) treating the dispersion to provide a crosslinking action by forming radicals within the dispersed polydiorganosiloxane.
Claim 11
Dependent Claim
35 words
The method according to claim 8 in which the dispersion of hydroxyl endblocked polydiorganosiloxane is formed by anionic emulsion polymerization of siloxanes selected from the group consisting of polydiorganosiloxane cyclics and hydroxyl endblocked polydiorganosiloxane oligomers.
Claim 12
Dependent Claim
24 words
The method according to claim 8 in which the radicals are formed within the dispersed polydiorganosiloxane by exposing the dispersion to high energy radiation.
Claim 13
Dependent Claim
26 words
The method according to claim 8 in which the radicals are formed within the dispersed polydiorganosiloxane by the combined action of heat and a radical-producing agent.
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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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |