US4412032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siliconized polyether thermosetting coating compositions
Assignee: DeSoto Inc
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Filing: 1982-04-28
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Granted: 1983-10-25
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Expires: 2002-04-28
Abstract
Abstract Pigmented thermosetting organic solvent solution coating compositions are disclosed which cure to provide improved weather resistance. These coating compositions contain three resin components, as follows: (1) an essentially nonfunctional organic solvent-soluble silicone resin reaction product of a low molecular weight hydroxy functional polyether with an hydroxy or alkoxy-functional organic polysiloxane, said polyether having an average molecular weight in the range of 300 to 4000 and an hydroxy functionality of at least about 3, said polysiloxane being present in an amount of from 8% to 20% of the weight of the three resin components, and said polyether and said polysiloxane being combined in approximately stoichiometric proportions; (2) a reactive organic solvent-soluble essentially linear high molecular weight hydroxy functional polyester constituting the balance of the three resin components; and (3) from 3% to 15% of the three resin components of a heterocyclic aminoplast resin for curing the reactive polyester. Components 1 and 2 are compatible in the solution and at least partially incompatible in a film as the solvent evaporates, so that component 1 can concentrate at the surface to enhance the weather resistance.
Inventors
- 👤 Joseph E. Gaske
- 👤 Thomas H. Plaisance
- 👤 Kazys Sekmakas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:12
CPC Classifications
C; C09; C09D; C09D167/00; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C09D183/00; C09D183/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
231 words
An organic solvent solution coating composition adapted to deposit a thermosetting weather-resistant coating comprising three essential resin components, as follows: (1) an essentially nonfunctional organic solvent-soluble silicone resin reaction product of a low molecular weight hydroxy functional polyether with an hydroxy or alkoxy-functional organic polysiloxane, said polyether having an average molecular weight in the range of 300 to 4000 and an hydroxy functionality of at least about 3, said polysiloxane being present in an amount of from 8% to 20% of the weight of the three resin components, and said polyether and said polysiloxane being combined in approximately stoichiometric proportions; (2) a reactive organic solvent-soluble essentially linear high molecular weight hydroxy functional polyester, said hydroxy functionality being present in an amount to provide a thermoset film by reaction with aminoplast resin, said reactive polyester constituting the balance of the three resin components; and (3) from 3% to 15%, based on the weight of the three resin components, of a heterocyclic aminoplast resin for curing said reactive polyester, said components 1 and 2 being compatible in the solution and at least partially incompatible in a film as the solvent evaporates, so that components 2 and 3 can cure in a deposited film and adhere the coating to a metal substrate, and component 1 can concentrate at the surface to enhance the weather resistance which is obtained when a deposited coating is baked.
Claim 2
Dependent Claim
231 words
An organic solvent solution coating composition adapted to deposit a thermosetting weather-resistant coating comprising three essential resin components, as follows: (1) an essentially nonfunctional organic solvent-soluble silicone resin reaction product of a low molecular weight hydroxy functional polyether with an hydroxy or alkoxy-functional organic polysiloxane, said polyether having an average molecular weight in the range of 300 to 4000 and an hydroxy functionality of at least about 3, said polysiloxane being present in an amount of from 8% to 20% of the weight of the three resin components, and said polyether and said polysiloxane being combined in approximately stoichiometric proportions; (2) a reactive organic solvent-soluble essentially linear high molecular weight hydroxy functional polyester, said hydroxy functionality being present in an amount to provide a thermoset film by reaction with aminoplast resin, said reactive polyester constituting the balance of the three resin components; and (3) from 3% to 15%, based on the weight of the three resin components, of a heterocyclic aminoplast resin for curing said reactive polyester, said components 1 and 2 being compatible in the solution and at least partially incompatible in a film as the solvent evaporates, so that components 2 and 3 can cure in a deposited film and adhere the coating to a metal substrate, and component 1 can concentrate at the surface to enhance the weather resistance which is obtained when a deposited coating is baked.
Claim 3
Dependent Claim
31 words
A coating composition as recited in claim 1 in which said low molecular weight polyether contains from 1 to 2 hydroxy groups for each 100 to 300 units of molecular weight.
Claim 4
Dependent Claim
24 words
A coating composition as recited in claim 2 in which said low molecular weight polyether has an average molecular weight of 350 to 1000.
Claim 5
Dependent Claim
24 words
A coating composition as recited in claim 2 in which said polysiloxane is hydroxy functional with an hydroxy content of from 1% to 15%.
Claim 6
Dependent Claim
50 words
A coating composition as recited in claim 1 in which said high molecular weight polyester is provided by polyesterification of essentially only difunctional reactants, the hydroxy to carboxy weight ratio range of the reactants being from 1.03:1 to 1.30:1, and the polyester has an acid value of less than 30.
Claim 7
Dependent Claim
24 words
A coating composition as recited in claim 5 in which said high molecular weight polyester has an hydroxyl number in the range of 80-140.
Claim 8
Dependent Claim
33 words
A coating composition as recited in claim 1 in which said aminoplast resin component is constituted by from 10% to 12%, based on the weight of the three resin components, of melamine-formaldehyde condensate.
Claim 9
Dependent Claim
28 words
A coating composition as recited in claim 1 in which said composition is pigmented to a pigment to binder weight ratio in the range of 1:1 to 1:6.
Claim 10
Dependent Claim
22 words
A coating composition as recited in claim 3 in which said polyether is the reaction product of propylene oxide with trimethylol propane.
References Cited (Backward Citations)
US3629308A
Cited
US3556754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |