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Patent US4528313A successfully refreshed from Google Patents.
US4528313A
Expired / Lapsed
US
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Polydimethylsiloxanes having improved thermal stability
Assignee: Dow Silicones Corp
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Filing: 1984-06-15
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Granted: 1985-07-09
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Expires: 2004-06-15
Abstract
Abstract Silicone compositions having improved thermal oxidative stability are disclosed. The compositions contain iron acetylacetonate, nickel acetylacetonate, cerium acetylacetonate, alpha,omega-bis(trimethylsiloxy)-polydimethylsiloxanes, and optionally, a carboxylic acid. The compositions show greatly increased gel times at temperatures of, e.g. 275° C.
Inventors
- 👤 Terence J. Swihart
- 👤 James E. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:48
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0091; C08K5/04; C08K5/09
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A silicone composition having improved heat stability, said composition comprising: (A) from 0.004 to 0.10 percent by weight of iron acetylacetonate; (B) from 0.004 to 0.10 percent by weight of nickel acetylacetonate; (C) from 0.004 to 0.10 percent by weight of cerium acetylacetonate; (D) from 0 to 30 percent by weight of a carboxylic acid having from 2 to 9 carbon atoms; and (E) from 69.7 to 99.988 percent by weight of alpha,omega-bis(trimethylsiloxy)polydimethylsiloxane fluid, all of the above percents being based on the total weight of the composition.
Claim 2
Dependent Claim
88 words
A silicone composition having improved heat stability, said composition comprising: (A) from 0.004 to 0.10 percent by weight of iron acetylacetonate; (B) from 0.004 to 0.10 percent by weight of nickel acetylacetonate; (C) from 0.004 to 0.10 percent by weight of cerium acetylacetonate; (D) from 0 to 30 percent by weight of a carboxylic acid having from 2 to 9 carbon atoms; and (E) from 69.7 to 99.988 percent by weight of alpha,omega-bis(trimethylsiloxy)polydimethylsiloxane fluid, all of the above percents being based on the total weight of the composition.
Claim 3
Dependent Claim
64 words
A composition as claimed in claim 1 wherein Component (A) is present from 0.01 to 0.05 percent by weight; Component (B) is present from 0.01 to 0.05 percent by weight; Component (C) is present from 0.01 to 0.05 percent by weight; Component (D) is present from 3 to 15 percent by weight; and Component (E) is present from 84.97 to 96.85 percent by weight.
Claim 4
Dependent Claim
64 words
A composition as claimed in claim 2 wherein Component (A) is present from 0.020 to 0.030 percent by weight; Component (B) is present from 0.014 to 0.021 percent by weight; Component (C) is present from 0.024 to 0.036 percent by weight; Component (D) is present from 5.8 to 8.7 percent by weight; and Component (E) is present from 91.213 to 94.142 percent by weight.
Claim 5
Dependent Claim
13 words
A composition as claimed in claim 3 wherein Component (D) is 2-ethylhexanoic acid.
Claim 6
Dependent Claim
65 words
A mixture of salts comprising (A) 0.5 to 10 percent by weight iron acetylacetonate; (B) 0.5 to 10 percent by weight nickel acetylacetonate; (C) 0.5 to 10 percent by weigh cerium acetylacetonate; and (D) 70 to 98.5 percent by weight of a carboxylic acid having from 2 to 9 carbon atoms, all of the above percents being based on the total weight of the mixture.
Claim 7
Dependent Claim
65 words
A mixture of salts comprising (A) 0.5 to 10 percent by weight iron acetylacetonate; (B) 0.5 to 10 percent by weight nickel acetylacetonate; (C) 0.5 to 10 percent by weigh cerium acetylacetonate; and (D) 70 to 98.5 percent by weight of a carboxylic acid having from 2 to 9 carbon atoms, all of the above percents being based on the total weight of the mixture.
Claim 8
Dependent Claim
55 words
A mixture of salts as claimed in claim 5 wherein Component (A) is present from 1 to 6.0 percent by weight; Component (B) is present from 1 to 6.0 percent by weight; Component (C) is present from 1 to 6.0 percent by weight; and Component (D) is present from 82 to 97 percent by weight.
Claim 9
Dependent Claim
55 words
A mixture of salts as claimed in claim 6 wherein Component (A) is present from 2 to 3 percent by weight; Component (B) is present from 1.4 to 2.1 percent by weight; Component (C) is present from 2.4 to 3.6 percent by weight; and Component (D) is present from 91.3 to 94.2 percent by weight.
Claim 10
Dependent Claim
15 words
A mixture of salts as claimed in claim 7 wherein Component (D) is 2-ethylhexanoic acid.
Claim 11
Dependent Claim
80 words
Method for improving the heat stability of an alpha,omega-bis(trimethylsiloxy)polydimethylsiloxane, said method comprising dispersing within the alpha,omega-bis(trimethylsiloxy)polydimethylsiloxane a mixture of salts, said mixture comprising: (A) 0.5 to 10 percent by weight iron acetylacetonate; (B) 0.5 to 10 percent by weight nickel acetylacetonate; (C) 0.5 to 10 percent by weight cerium acetylacetonate; (D) 70 to 98.5 percent of a carboxylic acid having from 2 to 9 carbon atoms, all of the above percents being based on the total weight of the mixture.
Claim 12
Dependent Claim
80 words
Method for improving the heat stability of an alpha,omega-bis(trimethylsiloxy)polydimethylsiloxane, said method comprising dispersing within the alpha,omega-bis(trimethylsiloxy)polydimethylsiloxane a mixture of salts, said mixture comprising: (A) 0.5 to 10 percent by weight iron acetylacetonate; (B) 0.5 to 10 percent by weight nickel acetylacetonate; (C) 0.5 to 10 percent by weight cerium acetylacetonate; (D) 70 to 98.5 percent of a carboxylic acid having from 2 to 9 carbon atoms, all of the above percents being based on the total weight of the mixture.
Claim 13
Dependent Claim
53 words
A method as claimed in claim 9 wherein Component (A) is present from 1 to 6.0 percent by weight Component (B) is present from 1 to 6.0 percent by weight Component (C) is present from 1 to 6.0 percent by weight; and Component (D) is present from 82 to 97 percent by weight.
Claim 14
Dependent Claim
53 words
A method as claimed in claim 10 wherein Component (A) is present from 2 to 3 percent by weight; Component (B) is present from 1.4 to 2.1 percent by weight; Component (C) is present from 2.4 to 3.6 percent by weight; and Component (D) is present from 91.3 to 94.2 percent by weight.
Claim 15
Dependent Claim
13 words
A method as claimed in claim 11 wherein Component (D) is 2-ethylhexanoic acid.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |