US4612249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding polyurethanes to polyolefins
Assignee: RCA Corp
•
Filing: 1984-12-21
•
Granted: 1986-09-16
•
Expires: 2004-12-21
Abstract
Abstract A process of bonding a coating of a polyurethane resin to a polyolefin substrate is provided. The polyolefin substrate is coated with a graft copolymer of a polyolefin and a functional monomer such as acrylic acid. The graft copolymer is flame treated to fuse it. A liquid polyurethane precursor composition is then applied thereto and cured.
Inventors
- 👤 Marvin Packer
- 👤 John X. Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:31
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/08; B05D7/00; B05D7/02; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/0427; C08J7/043; C08J2323/00; C08J2323/02; C08J2433/00; C08J2433/04; C08J2433/06; C08J2433/08; C08J2475/00; C08J2475/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T428/31587; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A process for producing a bond between a polyolefin substrate and a polyurethane comprising: (a) forming on the polyolefin substrate a coating consisting essentially of a graft copolymer of a polyolefin and an acrylate monomer; (b) flame treating the coating for a time sufficient to fuse the graft copolymer to the substrate; (c) applying to said fused coating a liquid polyurethane precursor composition; and (d) curing said composition.
Claim 2
Dependent Claim
68 words
A process for producing a bond between a polyolefin substrate and a polyurethane comprising: (a) forming on the polyolefin substrate a coating consisting essentially of a graft copolymer of a polyolefin and an acrylate monomer; (b) flame treating the coating for a time sufficient to fuse the graft copolymer to the substrate; (c) applying to said fused coating a liquid polyurethane precursor composition; and (d) curing said composition.
Claim 3
Dependent Claim
15 words
A process in accordance with claim 1, wherein the polyolefin substrate is polyethylene or polypropylene.
Claim 4
Dependent Claim
13 words
A process in accordance with claim 2, wherein the polyolefin substrate is polyethylene.
Claim 5
Dependent Claim
17 words
A process in accordance with claim 1, wherein the graft copolymer is of polyethylene and acrylic acid.
Claim 6
Dependent Claim
20 words
A process in accordance with claim 4, wherein the graft copolymer contains about six percent by weight of acrylic acid.
Claim 7
Dependent Claim
23 words
A process in accordance with claim 1, wherein the graft copolymer coating is flame treated for from about 5 to about 10 seconds.
Claim 8
Dependent Claim
24 words
A process in accordance with claim 1, wherein the polyurethane precursor composition includes an aliphatic or cycloaliphatic isocyanate containing at least two isocyanate groups.
Claim 9
Dependent Claim
25 words
A process in accordance with claim 1, wherein the polyurethane precursor composition includes an aliphatic or cycloaliphatic polyol containing from two to four functional groups.
Claim 10
Dependent Claim
27 words
A process in accordance with claim 1, wherein the polyurethane precursor composition is cured by heating to a temperature of from about 60° to about 100° C.
Claim 11
Dependent Claim
27 words
A process in accordance with claim 1, wherein steps (c) and (d) are repeated one or more times to form a polyurethane coating of a predetermined thickness.
Claim 12
Dependent Claim
11 words
A coated polyolefin substrate produced by the process of claim 1.
References Cited (Backward Citations)
US2923640A
Cited
US3023126A
Cited
US3198692A
Cited
US3326742A
Cited
US3511682A
Cited
US3970771A
Cited
US4311745A
Cited
US4302272A
Cited
US4337296A
Cited
US4419408A
Cited
US4430135A
Cited
US4432820A
Cited
US4444975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |