Patent US3940468A successfully refreshed from Google Patents.
US3940468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for laminating rigid polyurethane foam to a gelled polyester resin
Assignee: Fibre-Thane Inc
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Filing: 1972-07-24
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Granted: 1976-02-24
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Expires: 1992-07-24
Abstract
Abstract A polyurethane pre-foam formulation having improved adhesion to polyester resins is disclosed. The polyurethane is of the type formed by the reaction of an isocyanate and a polyol together with a blowing agent. The improved formulation contains a polyester resin between about 1 and 10% by weight of the polyurethane together with a sufficient amount of a free radical catalyst to bring about a cure of the added polyester resin. Preferably, the improved polyurethane prefoam is foamed and cross-linked in contact with a partially uncured but gelled unsaturated polyester laminating resin which contains an unsaturated monomer such as styrene. When such a polyester and a polyurethane foam are cured together, a superior bond between them results when the polyurethane formulation is compounded in accordance with the teachings of the present invention.
Inventors
- 👤 Reginald V. Tunstall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:10
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/0025; B29C37/0028; B29C37/0032; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B29C44/00; B29C44/02; B29C44/12; B29C44/14; B29C44/34; B29C44/3415; B32B27/36; B32B5/00; B32B5/18; B32B5/20; C; C08; C08J; C08J9/00; C08J9/34; B29C33/00; B29C33/20; B29K; B29K2075/00; B29K2105/00; B29K2105/06; B29K2105/12; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2262/00; B32B2262/10; B32B2262/101; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; C08J2375/00; C08J2375/04; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
A process for laminating a rigid polyurethane foam to a gelled polyester resin comprising adding two mixtures to a pre-foam mixture of a polyisocyanate and polyol with sufficiently high functionality to form a rigid foam; said first mixture comprising: about 21/2% by weight of said polyisocyanate and polyol of an unsaturated polyester laminating resin, between 1 and 2% by weight based upon the total weight of added polyester resin of an organic amine catalyst, about 0.75% by weight based upon the total weight of added polyester of cobalt octoate, and said second mixture comprising: about 21/2% by weight based upon the total weight of said polyisocyanate and polyol of a polyester resin, between about 1.5 and 3% by weight based upon the total weight of added polyester resin of benzoyl peroxide and between about 0.15 and 0.75% by weight based upon the total weight of added polyester of dimethyl aniline; contacting the pre-foam mixture to a gelled polyester resin; curing the gelled polyester and pre-foam at elevated temperatures to produce a polyester-polyurethane foam laminate of improved adhesion.
Claim 2
Dependent Claim
177 words
A process for laminating a rigid polyurethane foam to a gelled polyester resin comprising adding two mixtures to a pre-foam mixture of a polyisocyanate and polyol with sufficiently high functionality to form a rigid foam; said first mixture comprising: about 21/2% by weight of said polyisocyanate and polyol of an unsaturated polyester laminating resin, between 1 and 2% by weight based upon the total weight of added polyester resin of an organic amine catalyst, about 0.75% by weight based upon the total weight of added polyester of cobalt octoate, and said second mixture comprising: about 21/2% by weight based upon the total weight of said polyisocyanate and polyol of a polyester resin, between about 1.5 and 3% by weight based upon the total weight of added polyester resin of benzoyl peroxide and between about 0.15 and 0.75% by weight based upon the total weight of added polyester of dimethyl aniline; contacting the pre-foam mixture to a gelled polyester resin; curing the gelled polyester and pre-foam at elevated temperatures to produce a polyester-polyurethane foam laminate of improved adhesion.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said organic amine catalyst is added at a level of about 1.5%.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein said cobalt octoate is added at a level of about 0.75%.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein said benzoyl peroxide is added at a level of about 2%.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein said dimethyl aniline is added at a level of about 0.2%.
References Cited (Backward Citations)
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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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |