US4071390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating flexible substrates with polyurethane-polyurea elastomers and products produced thereby
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1975-07-01
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Granted: 1978-01-31
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Expires: 1995-07-01
Abstract
Abstract Process for coating flexible substrates which comprises applying a finishing polyurethane-polyurea elastomer coating to a release surface, applying an undercoat of a polyurethane-polyurea elastomer having a different composition than the finishing coating on the finishing coating and applying a flexible substrate to the undercoating.
Inventors
- 👤 Albert Strassel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:27
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; B; B05; B05D; B05D7/00; B05D7/12; B05D7/50; B05D7/52; B05D7/54; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C09; C09D; C09D175/00; C09D175/04; C09D175/08; B05D3/00; B05D3/04; B05D3/0433; B05D3/0453; B05D3/046; C08G2150/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/31504; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A method of forming a polyurethane-polyurea coating having good resistance to repeated flexing, abrasion, scratching and aging which comprises applying to a release surface a top finishing coat comprising the reaction product of an aromatic diamine with a prepolymer prepared by reacting an excess of a polyisocyanate with a polyol consisting essentially of a diol or mixture of diols; at least partially curing said finishing coat; applying on said finishing coat an undercoat comprising the reaction product of an aromatic diamine with a prepolymer prepared by reacting an excess of a polyisocyanate with a polyol consisting essentially of a polyol having a hydroxy functionality of at least 3 or a mixture of polyols having an average hydroxy functionality greater than 2 and sufficiently high to substantially increase the flex resistance of the total assembly to the top finishing coat; applying a flexible substrate to the undercoat, and curing the entire assembly including the undercoat to bond the top finishing coat, the undercoat and the flexible substrate together.
Claim 2
Independent Claim
167 words
A method of forming a polyurethane-polyurea coating having good resistance to repeated flexing, abrasion, scratching and aging which comprises applying to a release surface a top finishing coat comprising the reaction product of an aromatic diamine with a prepolymer prepared by reacting an excess of a polyisocyanate with a polyol consisting essentially of a diol or mixture of diols; at least partially curing said finishing coat; applying on said finishing coat an undercoat comprising the reaction product of an aromatic diamine with a prepolymer prepared by reacting an excess of a polyisocyanate with a polyol consisting essentially of a polyol having a hydroxy functionality of at least 3 or a mixture of polyols having an average hydroxy functionality greater than 2 and sufficiently high to substantially increase the flex resistance of the total assembly to the top finishing coat; applying a flexible substrate to the undercoat, and curing the entire assembly including the undercoat to bond the top finishing coat, the undercoat and the flexible substrate together.
Claim 3
Dependent Claim
56 words
The method of claim 1 in which the prepolymer of the top finishing coat contains an NCO/OH ratio between about 1.5 and 3 and in which the polyurethane-polyurea product of the top finishing coating contains a NH 2 /OH ratio greater than 0.5 and an NCO/(OH + NH 2 ) ratio between about 0.95 and 1.6.
Claim 4
Dependent Claim
26 words
The method of claim 2 in which the NCO/OH ratio is at least 2 and the NH 2 /OH ratio is between about 0.5 and 2.
Claim 5
Dependent Claim
168 words
Method of claim 1 in which the top finishing coat is prepared by (a) reaction of an aromatic diamine in a solvent with a prepolymer formed from a mixture of two polyols, one of which is a polyoxypropylene glycol and/or a polyoxyethylene glycol and the other a polytetramethylene glycol with an excess of a diisocyanate, or (b) reaction of two prepolymers one of which is prepared by reacting a polyoxypropylene glycol and/or a polyoxyethylene glycol with an excess of a dissocyanate, and the other being prepared by reacting a polytetramethylene glycol with an excess of a diisocyanate and in which the undercoat is prepared by the reaction of an aromatic amine in a solvent solution with a prepolymer prepared by reacting an excess of a dissocyanate with a polyol consisting essentially of a polyol having an hydroxy functionality of at least 3 or a mixture of polyols having an average hydroxy functionality greater than 2 and sufficiently high to substantially increase the flex resistance of the total assembly.
Claim 6
Dependent Claim
42 words
The method of claim 4 in which the polyols are oxypropylated or oxyethylated polyols having a molecular weight between about 400 and 7000 and in which the polytetramethylene glycol used in the finishing coat has average molecular weight between 700 and 4000.
Claim 7
Dependent Claim
19 words
The method of claim 5 in which the dissocyanate is toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate or isophorone diisocyanate.
Claim 8
Dependent Claim
22 words
The method of claim 5 in which the aromatic diamine is benzidine, dichlorobenzidine, diiamino-dichlorodiphenylmethane, methylene diamine or metaphenylene diamine, or mixtures thereof.
Claim 9
Dependent Claim
24 words
The method of claim 5 in which the diamine is in a solution of a ketone, an ester, a chlorinated hydrocarbon or mixtures thereof.
Claim 10
Dependent Claim
46 words
The method of claim 5 in which the prepolymers contain an NCO/OH ratio in excess of 1.5 and are prepared by heating the polyols and polyisocyanate to a temperature between 50° and 150° C over a period of 1 to 5 hours under inert gas atmosphere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |