US4303595A
Expired / Lapsed
US
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Silicone-containing elastomer and process for the preparation thereof
Assignee: Akron Catheter Inc
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Filing: 1980-08-27
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Granted: 1981-12-01
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Expires: 2000-08-27
Abstract
Abstract A novel elastomeric composition of matter comprises a suitable elastomer, a masterbatch consisting of a silicone compound in an amount of from about 10 to about 50 parts by weight based upon the weight of the elastomer, titanium dioxide, and clay. A process for the preparation of a silicone-containing elastomeric composition of matter is provided and includes the steps of masterbatching a silicone compound, clay and titanium dioxide to form a dispersion, adding the dispersion to the elastomer and thereafter forming and curing a desired product therefrom. The composition is useful in the manufacture of rubber goods such as surgical and medical products which can be single or multi-layered.
Inventors
- 👤 Dwight L. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:44
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/04; A61L29/049; C; C08; C08L; C08L7/00; C08L7/02; C08L83/00; C08L83/04; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/346; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A process for the preparation of a silicone-containing elastomeric composition of matter comprising the steps of: masterbatching a dimethylpolysiloxane compound, clay and titanium dioxide to form a dispersion; adding said dispersion to a natural rubber latex with stirring; and, thereafter forming and curing a product from the silicone-containing elastomeric composition wherein said dimethylpolysiloxane compound is present in an amount of more than 10 to about 50 parts by weight, based upon the weight of the rubber in the latex, the titanium dioxide is present in an amount of from about 5 to 15 parts by weight, based upon the weight of the rubber in the latex and the clay is present in an amount of from about 5 to 20 parts by weight, based upon the weight of the rubber in the latex.
Claim 2
Dependent Claim
133 words
A process for the preparation of a silicone-containing elastomeric composition of matter comprising the steps of: masterbatching a dimethylpolysiloxane compound, clay and titanium dioxide to form a dispersion; adding said dispersion to a natural rubber latex with stirring; and, thereafter forming and curing a product from the silicone-containing elastomeric composition wherein said dimethylpolysiloxane compound is present in an amount of more than 10 to about 50 parts by weight, based upon the weight of the rubber in the latex, the titanium dioxide is present in an amount of from about 5 to 15 parts by weight, based upon the weight of the rubber in the latex and the clay is present in an amount of from about 5 to 20 parts by weight, based upon the weight of the rubber in the latex.
Claim 3
Dependent Claim
46 words
A process, as set forth in claim 1, wherein said step of masterbatching includes the steps of: combining the titanium dioxide and clay with high speed stirring and thereafter adding the dimethylpolysiloxane compound with stirring at lower speeds for about 10 minutes to form a dispersion.
Claim 4
Dependent Claim
27 words
A process, as set forth in claim 1, wherein said dimethylpolysiloxane compound has a viscosity-average molecular weight of about 7,000 and a viscosity of about 100 centistokes.
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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |