US4024317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating pretreated vulcanized articles of saturated or unsaturated polyolefin rubber
Assignee: Huels AG
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Filing: 1975-10-09
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Granted: 1977-05-17
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Expires: 1995-10-09
Abstract
Abstract Polyolefin rubber is coated with an isocyanate-curing varnish whose binder is a mixture of (a) a saturated oligoester resin containing hydroxyl groups and having a molecular weight of 250-3,500 and whose alcohol component is at least difunctional and 20-100 mole percent of which is 1,4-bis(hydroxymethyl)cyclohexane; and (b) a di- or poly-functional isocyanate or mixture thereof, wherein the ratio of isocyanate groups of the isocyanate to the hydroxyl groups of the oligoester resins is about 0.75 : 1 to 1 : 1, by pre-treating the vulcanized rubber article with a strong oxidizing agent or by irradiation with ultraviolet light.
Inventors
- 👤 Dieter Stoye
- 👤 Werner Andrejewski
- 👤 Adolf Draxler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:55
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/10; B05D3/101; B05D7/00; B05D7/02; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/423; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J2323/00; C08J2323/02; C08J2323/16; C08J2475/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31587; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
166 words
In a process for coating the surface of a vulcanized polyolefin rubber pretreated with chromosulfuric acid and curing the resultant coating, the improvement which comprises coating said surface with a varnish coating material consisting essentially of: a. a saturated oligoester resin dissolved in an inert solvent, said resin having a molecular weight of 250-3,500 and an alcohol component which is at least difunctional, contains free hydroxyl groups and consists essentially of 20-100 mole percent 1,4-bis(hydroxymethyl)cyclohexane, the acid component of said resin being a mixture of at least one aromatic or cycloaliphatic dicarboxylic acid with an aliphatic dicarboxylic acid in a molar ratio of 1-3 moles of cyclic dicarboxylic acid per mole of aliphatic dicarboxylic acid; and b. a di- or poly-functional isocyanate or mixture thereof, wherein the ratio of the isocyanate groups to the free hydroxyl groups of the oligoester resin is 0.75:1 to 1:1, to form a polyolefin rubber coated with a varnish having xylene resistance, good adhesive strength, high elasticity and excellent surface hardness.
Claim 2
Dependent Claim
166 words
In a process for coating the surface of a vulcanized polyolefin rubber pretreated with chromosulfuric acid and curing the resultant coating, the improvement which comprises coating said surface with a varnish coating material consisting essentially of: a. a saturated oligoester resin dissolved in an inert solvent, said resin having a molecular weight of 250-3,500 and an alcohol component which is at least difunctional, contains free hydroxyl groups and consists essentially of 20-100 mole percent 1,4-bis(hydroxymethyl)cyclohexane, the acid component of said resin being a mixture of at least one aromatic or cycloaliphatic dicarboxylic acid with an aliphatic dicarboxylic acid in a molar ratio of 1-3 moles of cyclic dicarboxylic acid per mole of aliphatic dicarboxylic acid; and b. a di- or poly-functional isocyanate or mixture thereof, wherein the ratio of the isocyanate groups to the free hydroxyl groups of the oligoester resin is 0.75:1 to 1:1, to form a polyolefin rubber coated with a varnish having xylene resistance, good adhesive strength, high elasticity and excellent surface hardness.
Claim 3
Dependent Claim
16 words
A process according to claim 1 wherein the vulcanized article is formed of an ethylene/propylene rubber.
Claim 4
Dependent Claim
17 words
A process according to claim 1 wherein the vulcanized article is formed of an ethylene/propylene/multiple olefin rubber.
Claim 5
Dependent Claim
21 words
A process according to claim 3 wherein the multiple olefin component of the rubber is 1,4-hexadiene, dicylcopentadiene, methylenenorbornene, ethylidenenorbornene or propenylnorbornene.
Claim 6
Dependent Claim
25 words
A process according to claim 1 wherein the vulcanized article is dipped in chromosulfuric acid for about 1-30 minutes at about 100° to 15° C.
Claim 7
Dependent Claim
19 words
A process according to claim 1, wherein said isocyanate is at least one of isophorone diisocyanate and trimethylhexamethylene diisocyanate.
Claim 8
Dependent Claim
46 words
A process according to claim 6, wherein said coating further comprises 5-30% by weight, based on the weight of components (a) and (b), of an unsaturated, styrene-free polyester resin obtained by the condensation of a mixture of saturated and unsaturated dicarboxylic acids with polycyclic polyvalent alcohols.
Claim 9
Dependent Claim
20 words
A process according to claim 6, wherein said coating further comprises a pigment, flow agent, cross-linking accelerator or dulling agent.
Claim 10
Dependent Claim
10 words
The product obtained according to the process of claim 6.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |