US4252709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Handling additive for silicone elastomers comprising boric acid and ethylene glycol or glycerol
Assignee: Dow Silicones Corp
•
Filing: 1979-03-19
•
Granted: 1981-02-24
•
Expires: 1999-03-19
Abstract
Abstract A handling additive composition increases the plasticity and reduces the stickiness of commercial silicone elastomer bases when it is added to them. The composition is obtained by mixing boric acid, polyhydroxy alcohol and filler.
Inventors
- 👤 Olgerts Skostins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:09
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/38; C08K5/00; C08K5/04; C08K5/05; C08K5/053; C08K5/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
A composition consisting essentially of the product obtained by combining (a) 100 parts by weight boric acid, (b) 100 to 300 parts by weight polyhydroxy alcohol selected from the group consisting of ethylene glycol and glycerol, and (c) 10 to 400 parts of filler.
Claim 2
Dependent Claim
44 words
A composition consisting essentially of the product obtained by combining (a) 100 parts by weight boric acid, (b) 100 to 300 parts by weight polyhydroxy alcohol selected from the group consisting of ethylene glycol and glycerol, and (c) 10 to 400 parts of filler.
Claim 3
Dependent Claim
13 words
The composition of claim 1 in which the polyhydroxy alcohol is ethylene glycol.
Claim 4
Dependent Claim
12 words
The composition of claim 1 in which the polyhydroxy alcohol is glycerol.
Claim 5
Dependent Claim
18 words
The composition of claim 1 in which the polyhydroxy alcohol is a mixture of ethylene glycol and glycerol.
Claim 6
Dependent Claim
15 words
The composition of claim 2, 3, or 4 in which the filler is fume silica.
Claim 7
Dependent Claim
68 words
A process for producing an improved handling silicone elastomer stock comprising shearing a mixture until a homogeneous stock is formed, said mixture comprising 100 parts by weight of a silicone elastomer base having a Williams plasticity greater than 0.5 mm, from 0.1 to 1.0 part by weight of the composition of claim 1, and an amount of an organic peroxide catalyst sufficient to vulcanize the silicone elastomer base.
Claim 8
Dependent Claim
80 words
A process for producing an improved handling silicone elastomer stock comprising shearing a mixture until a homogeneous stock is formed, said mixture comprising 100 parts by weight of a silicone elastomer base comprising a polydiorganosiloxane gum having a Williams plasticity greater than 0.5 mm, a reinforcing silica filler, and an anti-crepe aging material; from 0.1 to 0.5 part by weight of the composition of claim 1; and a suitable amount of an organic peroxide catalyst for the silicone elastomer base.
Claim 9
Dependent Claim
27 words
The cured silicone elastomer obtained by heating the homogeneous stock of claim 6 or 7 to a point above the activation temperature of the organic peroxide catalyst.
References Cited (Backward Citations)
US2541851A
Cited
US2579332A
Cited
US2644805A
Cited
US2721857A
Cited
US3070560A
Cited
US3677997A
Cited
US3730938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |