Patent US4684577A successfully refreshed from Google Patents.
US4684577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-stick silicone blend coating
Assignee: EIDP Inc
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Filing: 1986-09-30
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Granted: 1987-08-04
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Expires: 2006-09-30
Abstract
Abstract A blend of major amounts of a first silicon resin having relatively low proportions of silanol, phenyl and methyl groups with minor amounts of a second silicone resin having higher such proportions, preferably with aluminum flake, gives good adhesion to steel, aluminum and glass substrates and good non-stick performance for cooking foods. It can be used as a single-layer coating.
Inventors
- 👤 Jean L. Coq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:14
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C08; C08K; C08K3/00; C08K3/02; C08K3/08; C08L; C08L83/00; C08L83/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
A coating composition consisting essentially of a blend of two silicone resin precondensates and aluminum flake containing 60 to 95% by weight based on silicon solids of a first silicone resin precondensate which has 3.5-4.0% by weight silicon-bonded hydroxyl content, a ratio of methyl groups to silicon atoms of 1.10 to 1.20, and a ratio of phenyl groups to silicon atoms of 0.4 to 0.5, 5 to 40% by weight based on silicone solids of a second silicone resin precondensate which has 4-6% by weight silicon-bonded hydroxyl content, a ratio of methyl groups to silicon atoms of 1.20 to 1.30, and a ratio of phenyl groups to silicon atoms of 0.6 to 0.7, 1 to 8% by weight based on total solids of aluminum flake, and liquid media, said coating composition being at a solids content of 40 to 55% by weight.
Claim 2
Dependent Claim
142 words
A coating composition consisting essentially of a blend of two silicone resin precondensates and aluminum flake containing 60 to 95% by weight based on silicon solids of a first silicone resin precondensate which has 3.5-4.0% by weight silicon-bonded hydroxyl content, a ratio of methyl groups to silicon atoms of 1.10 to 1.20, and a ratio of phenyl groups to silicon atoms of 0.4 to 0.5, 5 to 40% by weight based on silicone solids of a second silicone resin precondensate which has 4-6% by weight silicon-bonded hydroxyl content, a ratio of methyl groups to silicon atoms of 1.20 to 1.30, and a ratio of phenyl groups to silicon atoms of 0.6 to 0.7, 1 to 8% by weight based on total solids of aluminum flake, and liquid media, said coating composition being at a solids content of 40 to 55% by weight.
Claim 3
Dependent Claim
22 words
The coating composition of claim 1 containing about 90% of said first silicone, 10% of said second silicone, and 2% aluminum flake.
Claim 4
Dependent Claim
72 words
The coating composition of claim 2 wherein said first silicone has about 3.9% silicon-bonded hydroxyl content, a ratio of methyl groups to silicon atoms of about 1.15, and a ratio of phenyl groups to silicon atoms of about 0.45, and said second silicone has about 4-6% silicon-bonded hydroxyl content, a ratio of methyl groups to silicon atoms of about 1.24, and a ratio of phenyl groups to silicon atoms of about 0.62.
Claim 5
Dependent Claim
17 words
A steel substrate coated with a dried and cured single layer of coating composition of claim 1.
Claim 6
Dependent Claim
16 words
An aluminum substrate coated with a dried and cured single layer coating composition of claim 1.
Claim 7
Dependent Claim
16 words
A glass substrate coated with a dried and cured single layer coating composition of claim 1.
Claim 8
Dependent Claim
16 words
A plastic substrate coated with a dried and cured single layer coating composition of claim 1.
Claim 9
Dependent Claim
26 words
An article of cookware comprising a substrate of steel, aluminum, glass or plastic coated with a dried and cured single layer coating composition of claim 1.
Claim 10
Dependent Claim
13 words
An article of microwave cookware of claim 8 wherein the substrate is plastic.
References Cited (Backward Citations)
US4374754A
Cited
US4477517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |