US4898898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer-densified fillers
Assignee: General Electric Co
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Filing: 1989-05-19
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Granted: 1990-02-06
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Expires: 2009-05-19
Abstract
Abstract A method for providing polymer-densified fillers consisting essentially of mixing 100 parts of a silicone polymer with 50 to 500 parts of reinforcing filler or 400 to 5000 parts of extending filler and mixing such blend for an amount of time effective for providing a dense, free-flowing particulate mixture.
Inventors
- 👤 Thomas H. Fitzgerald
- 👤 John S. Razzano
- 👤 Todd R. Stegman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:40
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/12; B29B7/00; B29B7/80; B29B7/88; B29B7/90; C; C04; C04B; C04B18/00; C04B18/02; C04B18/022; C08; C08J; C08J3/00; C08J3/20; C08J3/203; C08J3/22; C08J3/226; C08K; C08K9/00; C08K9/08; B29K; B29K2083/00; B29K2105/00; B29K2105/06; B29K2105/16; B29K2483/00; C08J2383/00; C08J2383/04; C08J2483/00
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
130 words
A method for providing polymer-densified fillers, consisting essentially of: (A) adding to a suitable mixing vessel; (i) 100 parts by weight of a silicone polymer or mixture of silicone polymers having a viscosity ranging from about 1000 to about 200,000,000 centipoise at 25° C.; and (ii) an amount of filler comprising: (a) 50 to 500 parts by weight of reinforcing filler per 100 parts by weight of said silicone polymer; and (b) 900 to 5000 parts by weight of extending filler per 100 parts by weight of said silicone polymer; and (B) mixing said silicone polymer and said filler for an amount of time effective for providing a free-flowing particulate mixture having a density at least 100 percent higher than when the silicone polymer and filler first became free-flowing particles.
Claim 2
Independent Claim
130 words
A method for providing polymer-densified fillers, consisting essentially of: (A) adding to a suitable mixing vessel; (i) 100 parts by weight of a silicone polymer or mixture of silicone polymers having a viscosity ranging from about 1000 to about 200,000,000 centipoise at 25° C.; and (ii) an amount of filler comprising: (a) 50 to 500 parts by weight of reinforcing filler per 100 parts by weight of said silicone polymer; and (b) 900 to 5000 parts by weight of extending filler per 100 parts by weight of said silicone polymer; and (B) mixing said silicone polymer and said filler for an amount of time effective for providing a free-flowing particulate mixture having a density at least 100 percent higher than when the silicone polymer and filler first became free-flowing particles.
Claim 3
Dependent Claim
38 words
The method of claim 1 wherein the silicone polymer has the general formula: ##EQU3## where R is a monovalent hydrocarbon radical, a halogenated monovalent hydrocarbon radical or a cyanoalkyl radical and n varies from 1.95 to 2.1 inclusive.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the viscosity of the silicone polymer varies from 100,000 to 50,000,000 centipoise at 25° C.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the viscosity of the silicone polymer varies from 1,000,000 to 40,000,000 centipoise at 25° C.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the reinforcing filler is selected from the group consisting of fumed silica, precipitated silica and silica aerogel.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein the fumed silica, precipitated silica and silica aerogel are treated.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein there is added from about 100 to about 250 parts of reinforcing filler per 100 parts silicone polymer.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein there is added about 100 parts of reinforcing filler per 100 parts of silicone polymer.
Claim 10
Dependent Claim
22 words
The method of claim 1 wherein the reinforcing filler has a surface area of at least about 50 square meters per gram.
Claim 11
Dependent Claim
22 words
The method of claim 1 wherein the reinforcing filler has a surface area of at least about 100 square meters per gram.
Claim 12
Dependent Claim
23 words
The method of claim 1 wherein the mixing time is at least 50 percent more than required to initially form a free-flowing mixture.
Claim 13
Dependent Claim
23 words
The method of claim 1 wherein the mixing time is at least 100 percent more than required to initially form a free-flowing mixture.
Claim 14
Dependent Claim
22 words
The method of claim 1 wherein the diameter of the free-flowing, polymer-densified filler particles ranges from about 1 to about 100 microns.
Claim 15
Dependent Claim
22 words
The method of claim 1 wherein the diameter of the free-flowing, polymer-densified filler particles ranges from about 10 to about 75 microns.
Claim 16
Dependent Claim
22 words
The method of claim 1 wherein the diameter of the free-flowing, polymer-densified filler particles ranges from about 20 to about 50 microns.
Claim 17
Dependent Claim
46 words
The method of claim 1 wherein the extending filler is selected from the group consisting of titanium oxide, lithopone, zinc oxide, zirconium silicate, iron oxide, diatomaceous earth, calcium carbonate, glass fibers, magnesium oxide, chromic oxide, aluminum oxide, crushed quartz, calcined clay, asbestos, carbon graphite and cork.
Claim 18
Dependent Claim
23 words
The method of claim 1 wherein the extending filler is selected from the group consisting of diatomaceous earth, calcium carbonate and crushed quartz.
Claim 19
Dependent Claim
12 words
The method of claim 1 wherein the extending filler is crushed quartz.
Claim 20
Dependent Claim
25 words
The method of claim 1 wherein there is added from about 900 parts to about 3500 parts of extending filler per 100 parts silicone polymer.
Claim 21
Dependent Claim
25 words
The method of claim 1 wherein there is added from about 1000 parts to about 2000 parts of extending filler per 100 parts silicone polymer.
Claim 22
Dependent Claim
25 words
The method of claim 1 wherein the polymer is first added to the mixing vessel and the filler is added to said polymer during mixing.
Claim 23
Dependent Claim
12 words
The method of claim 21 wherein the filler is added in batches.
Claim 24
Dependent Claim
11 words
The method of claim 21 wherein the filler is added continuously.
Claim 25
Independent Claim
162 words
A method for adding filler to a base silicone composition comprising: (A) adding to a suitable mixing vessel: (i) 100 parts by weight of a silicone polymer or mixture of silicone polymers having a viscosity ranging from about 1000 to about 200,000,000 centipoise at 25° C.; and (ii) an amount of filler comprising: (a) 50 to 500 parts by weight of reinforcing filler per 100 parts by weight of said silicone polymer; and (b) 900 to 5000 parts by weight of extending filler per 100 parts by weight of said silicone polymer; and (B) mixing said silicone polymer and said filler for an amount of time effective for providing a free-flowing particulate mixture having a density at least 100 percent higher than when the silicone polymer and filler first became free-flowing particles; (C) adding an effective amount of said free-flowing, polymer-densified filler to said base silicone composition; and (D) combining said polymer-densified filler and said base silicone composition by a suitable means.
Claim 26
Independent Claim
162 words
A method for adding filler to a base silicone composition comprising: (A) adding to a suitable mixing vessel: (i) 100 parts by weight of a silicone polymer or mixture of silicone polymers having a viscosity ranging from about 1000 to about 200,000,000 centipoise at 25° C.; and (ii) an amount of filler comprising: (a) 50 to 500 parts by weight of reinforcing filler per 100 parts by weight of said silicone polymer; and (b) 900 to 5000 parts by weight of extending filler per 100 parts by weight of said silicone polymer; and (B) mixing said silicone polymer and said filler for an amount of time effective for providing a free-flowing particulate mixture having a density at least 100 percent higher than when the silicone polymer and filler first became free-flowing particles; (C) adding an effective amount of said free-flowing, polymer-densified filler to said base silicone composition; and (D) combining said polymer-densified filler and said base silicone composition by a suitable means.
Claim 27
Dependent Claim
21 words
The method of claim 24 wherein the means for combining the polymer-densified filler and the base silicone composition is a mill-band.
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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |