Patent US4026845A successfully refreshed from Google Patents.
US4026845A
Expired / Lapsed
US
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Method of reducing the foam density of silicone foams and compositions
Assignee: Dow Silicones Corp
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Filing: 1975-07-14
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Granted: 1977-05-31
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Expires: 1995-07-14
Abstract
Abstract Mixing a fluorinated surfactant with a silicone foam composition decreases the density of the cured foam. Increasing the amount of fluorinated surfactant decreases the foam density. Silicone compositions comprising a hydroxylated organosiloxane, an organohydrogensiloxane, a platinum catalyst and a fluorinated surfactant cure to foams with lower densities than the same compositions without the fluorinated surfactant. The cured foams can be used in the same applications as other silicone foams.
Inventors
- 👤 Yung K. Kim
- 👤 Chi-Long Lee
- 👤 Gary M. Ronk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:22
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2383/00; C08J2383/04; C08J2471/00; C08J2483/00; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
53 words
A method of reducing the density of a silicone foam comprising mixing with a foamable silicone composition having a base polydiorganosiloxane, a fluorinated surfactant selected from the group consisting of perfluorinated polyethers and silicon-containing fluorinated surfactants having repeating units of the formulae ##STR7## and foaming and curing to obtain a cured silicone foam.
Claim 2
Independent Claim
53 words
A method of reducing the density of a silicone foam comprising mixing with a foamable silicone composition having a base polydiorganosiloxane, a fluorinated surfactant selected from the group consisting of perfluorinated polyethers and silicon-containing fluorinated surfactants having repeating units of the formulae ##STR7## and foaming and curing to obtain a cured silicone foam.
Claim 3
Dependent Claim
16 words
The method in accordance with claim 1 in which the fluorinated surfactant is a perfluorinated polyether.
Claim 4
Dependent Claim
18 words
The method in accordance with claim 2 in which the perfluorinated polyether has a unit formula of ##STR8##
Claim 5
Dependent Claim
38 words
The method in accordance with claim 3 in which the perfluorinated polyether is present in an amount of from 0.01 to 10 parts by weight based on 100 parts of a base polydiorganosiloxane in the foamable silicone composition.
Claim 6
Dependent Claim
17 words
The method in accordance with claim 1 in which the fluorinated surfactant is a silicon-containing fluorinated surfactant.
Claim 7
Dependent Claim
19 words
The method in accordance with claim 5 in which the silicon-containing fluorinated surfactant has a unit formula of ##STR9##
Claim 8
Dependent Claim
28 words
The method in accordance with claim 5 in which the silicon-containing fluorinated surfactant has a general formula ##STR10## wherein x has an average value from 10 to 50.
Claim 9
Dependent Claim
80 words
A foamable silicone composition comprising a composition obtained by mixing (A) a hydroxylated organosiloxane having at least two silicon-bonded hydroxyl radicals per molecule, (B) an organohydrogensiloxane having an average of at least 2.5 silicon-bonded hydrogen atoms per molecule, (C) a platinum catalyst, and (D) a fluorinated surfactant selected from the group consisting of perfluorinated polyethers and silicon-containing fluorinated surfactants having repeating units of the formulae ##STR11## where there is from 1 to 40 silicon-bonded hydrogen atoms per silicon-bonded hydroxyl radicals.
Claim 10
Dependent Claim
80 words
A foamable silicone composition comprising a composition obtained by mixing (A) a hydroxylated organosiloxane having at least two silicon-bonded hydroxyl radicals per molecule, (B) an organohydrogensiloxane having an average of at least 2.5 silicon-bonded hydrogen atoms per molecule, (C) a platinum catalyst, and (D) a fluorinated surfactant selected from the group consisting of perfluorinated polyethers and silicon-containing fluorinated surfactants having repeating units of the formulae ##STR11## where there is from 1 to 40 silicon-bonded hydrogen atoms per silicon-bonded hydroxyl radicals.
Claim 11
Dependent Claim
17 words
The foamable silicone composition according to claim 8 in which the fluorinated surfactant is a perfluorinated polyether.
Claim 12
Dependent Claim
18 words
The foamable silicone composition according to claim 8 in which the fluorinated surfactant is a silicon-containing fluorinated surfactant.
Claim 13
Independent Claim
92 words
A method of reducing the density of a silicone foam comprising mixing (A) a hydroxylated organosiloxane having at least two silicon-bonded hydroxyl radicals per molecule, (B) an organohydrogensiloxane having an average of at least 2.5 silicon-bonded hydrogen atoms per molecule, (C) a platinum catalyst, and (D) a fluorinated surfactant selected from the group consisting of perfluorinated polyethers and silicon-containing fluorinated surfactants having repeating units of the formulae ##STR12## where there is from 1 to 40 silicon-bonded hydrogen atoms per silicon-bonded hydroxyl radicals, and foaming and curing to obtain a cured silicone foam.
Claim 14
Independent Claim
92 words
A method of reducing the density of a silicone foam comprising mixing (A) a hydroxylated organosiloxane having at least two silicon-bonded hydroxyl radicals per molecule, (B) an organohydrogensiloxane having an average of at least 2.5 silicon-bonded hydrogen atoms per molecule, (C) a platinum catalyst, and (D) a fluorinated surfactant selected from the group consisting of perfluorinated polyethers and silicon-containing fluorinated surfactants having repeating units of the formulae ##STR12## where there is from 1 to 40 silicon-bonded hydrogen atoms per silicon-bonded hydroxyl radicals, and foaming and curing to obtain a cured silicone foam.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |