Patent US4634733A successfully refreshed from Google Patents.
US4634733A
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Method of producing a silicone water-based elastomer
Assignee: Dow Silicones Corp
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Filing: 1986-05-28
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Granted: 1987-01-06
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Expires: 2006-05-28
Abstract
Abstract This invention describes a method of producing a silicone elastomer from an emulsion. When the ingredients are mixed together, the resulting latex can be used immediately. Removing the water from the latex results in a silicone elastomer. The method combines (A) an anionically stabilized, hydroxyl endblocked polydiorganosiloxane, present as an emulsion of dispersed particles in water, the emulsion having a pH of greater than 9, (B) dialkyltindicarboxylate, (C) alkylorthosilicate, (D) colloidal silica, and optionally (E) water, admixing (A) and (B) only in the presence of (C) to produce a dispersion of the ingredients in water. The ingredients can be distributed into a two-part system for storage. One embodiment includes fibers, lauryl alcohol, or a mixture of both in the emulsion; then forms an open-cell, elastomeric foam by forming a froth from the emulsion and removing the water from the froth.
Inventors
- 👤 Therese M. Bauman
- 👤 Alan L. Freiberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08J9/0085; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J9/143; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
251 words
A method of producing a silicone elastomer which is derived from ingredients comprising (A) 100 parts by weight of an anionically stabilizer, hydroxyl endblocked polydiorganosiloxane having a weight average molecular weight of above 50,000, the organic radicals being monovalent hydrocarbon radicals containing less than seven carbon atoms per radical or 2-(perfluoroalkyl)ethyl radicals having less than seven carbon atoms per radical, present as an emulsion of dispersed particles in water, the emulsion having a pH of greater than 9, (B) from 0.1 to 2.0 parts by weight of dialkyltindicarboxylate, (C) from 1 to 10 parts by weight of alkylorthosilicate of the formula Si(OR') 4 where R' is a lower alkyl radical of from 1 to 4 carbon atoms inclusive, (D) from 0 to 100 parts by weight of colloidal silica, (E) optionally additional water, and (F) optionally from 1 to 10 parts by weight of fibers having a diameter of from 1 to 10 micrometers and a length of from 30 micrometres to 10 millimeters with a length to diameter ratio of greater than 10 to 1, or from 0.2 to 1.5 parts by weight of lauryl alcohol, or mixtures thereof, consisting essentially of admixing the ingredients such that (A) and (B) are mixed only when (C) is present, the ingredients being stored before mixing as two parts, Part I and Part II, to produce an emulsion of the ingredients dispersed in water, which emulsion can be used immediately without a gestation period; and removing the water to produce the silicone elastomer.
Claim 2
Independent Claim
251 words
A method of producing a silicone elastomer which is derived from ingredients comprising (A) 100 parts by weight of an anionically stabilizer, hydroxyl endblocked polydiorganosiloxane having a weight average molecular weight of above 50,000, the organic radicals being monovalent hydrocarbon radicals containing less than seven carbon atoms per radical or 2-(perfluoroalkyl)ethyl radicals having less than seven carbon atoms per radical, present as an emulsion of dispersed particles in water, the emulsion having a pH of greater than 9, (B) from 0.1 to 2.0 parts by weight of dialkyltindicarboxylate, (C) from 1 to 10 parts by weight of alkylorthosilicate of the formula Si(OR') 4 where R' is a lower alkyl radical of from 1 to 4 carbon atoms inclusive, (D) from 0 to 100 parts by weight of colloidal silica, (E) optionally additional water, and (F) optionally from 1 to 10 parts by weight of fibers having a diameter of from 1 to 10 micrometers and a length of from 30 micrometres to 10 millimeters with a length to diameter ratio of greater than 10 to 1, or from 0.2 to 1.5 parts by weight of lauryl alcohol, or mixtures thereof, consisting essentially of admixing the ingredients such that (A) and (B) are mixed only when (C) is present, the ingredients being stored before mixing as two parts, Part I and Part II, to produce an emulsion of the ingredients dispersed in water, which emulsion can be used immediately without a gestation period; and removing the water to produce the silicone elastomer.
Claim 3
Dependent Claim
32 words
The method of claim 1 in which the ingredients are stored before mixing as two parts, Part I consisting essentially of (A), and Part II consisting essentially of (B), (C), and (D).
Claim 4
Dependent Claim
33 words
The method of claim 1 in which the ingredients are stored before mixing as two parts, Part I consisting essentially of (A) and (D), and Part II consisting essentially of (B) and (C).
Claim 5
Dependent Claim
33 words
The method of claim 1 in which the ingredients are stored before mixing as two parts, Part I consisting essentially of (A) and (C), and Part II consisting essentially of (B) and (D).
Claim 6
Dependent Claim
31 words
The method of claim 1 in which the ingredients are stored before mixing as parts, Part I consisting essentially of (A), (C), and (D), and Part II consisting essentially of (B).
Claim 7
Dependent Claim
80 words
The method of claim 3 in which the polydiorganosiloxane of (A) is a polydimethylsiloxane, (D) is from 1 to 50 parts by weight of colloidal silica in the form of a sodium stabilized colloidal silica dispersion in water, (C) is from 2 to 6 parts by weight of the silicate where R' is either ethyl or propyl radical, and (B) is from 0.25 to 0.75 parts by weight of dibutyltindilaurate, and the pH of Part A is greater than 10.
Claim 8
Dependent Claim
75 words
The method of claim 6 in which the polydimethylsiloxane has a weight average molecular weight of greater than 200,000, (D) is from 5 to 50 parts by weight of the colloidal silica, Part A also includes a thickening agent and has a pH of greater than 10, and combined Part A and Part B have a viscosity greater than 25 Pa.s at 25° C. and a solids content of greater than 45 percent by weight.
Claim 9
Dependent Claim
80 words
The method of claim 4 in which the polydiorganosiloxane of (A) is a polydimethylsiloxane, (D) is from 1 to 50 parts by weight of colloidal silica in the form of a sodium stabilized colloidal silica dispersion in water, (C) is from 2 to 6 parts by weight of the silicate where R' is either ethyl or propyl radical, and (B) is from 0.25 to 0.75 parts by weight of dibutyltindilaurate, and the pH of Part B is greater than 10.
Claim 10
Dependent Claim
76 words
The method of claim 8 in which the polydimethylsiloxane having a weight average molecular weight of greater than 200,000, (D) is from 5 to 50 parts by weight of the colloidal silica, Part A also includes a thickening agent, Part B has a pH of greater than 10, and combined Part A and Part B have a viscosity greater than 25 Pa.s at 25° C. and a solids content of greater than 45 percent by weight.
Claim 11
Dependent Claim
123 words
The method of claim 2 in which the polydiorganosiloxane of (A) is a polydimethylsiloxane having a weight average molecular weight of greater than 200,000, (D) is from 5 to 50 parts by weight of colloidal silica in the form of a sodium stabilized colloidal silica dispersion in water, (C) is from 2 to 6 parts by weight of the silicate wherein R' is either ethyl or propyl radical, (B) is from 0.25 to 0.75 parts by weight of dibutyltindilaurate, Part I also includes a thickening agent, Part II has a pH of greater than 10, and combined Part I and Part II have a viscosity greater than 25 Pa.s at 25° C. and a solids content of greater than 45 percent by weight.
Claim 12
Dependent Claim
122 words
The method of claim 5 in which the polydiorganosiloxane of (A) is a polydimethylsiloxane having a weight average molecular weight of greater than 200,000, (D) is from 5 to 50 parts by weight of colloidal silica in the form of a sodium stabilized colloidal silica dispersion in water, (D) is from 2 to 6 parts by weight of the silicate wherein R' is either ethyl or propyl radical, (B) is from 0.25 to 0.75 parts by weight of dibutyltindilaurate, Part I also includes a thickening agent and has a pH of greater than 10, and combined Part I and Part II have a viscosity greater than 25 Pa.s at 25° C. and a solids content of greater than 45 percent by weight.
Claim 13
Dependent Claim
14 words
Part II produced in accordance with claim 2, as it is stored before use.
Claim 14
Dependent Claim
17 words
Part I and Parrt II produced in accordance with claim 3, as they are stored before use.
Claim 15
Dependent Claim
17 words
Part I and Part II produced in accordance with claim 4, as they are stored before use.
Claim 16
Dependent Claim
14 words
Part I produced in accordance with claim 5, as it is stored before use.
Claim 17
Dependent Claim
33 words
A mixture consisting essentially of 100 parts by weight of (A), from 1 to 10 parts by weight of (D), and (F), the ingredients (A), (D), and (F) being those of claim 1.
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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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |