US4075152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stabilizing pigment dispersions in urethane coatings
Assignee: Lyondell Chemical Technology LP
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Filing: 1976-04-02
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Granted: 1978-02-21
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Expires: 1996-04-02
Abstract
Abstract When pigments which are to be dispersed in the polyol package of a two-package urethane coating are pre-treated by slurrying in an organic polyisocyanate, pigment flocculation is inhibited. Coating properties, such as gloss, weatherability, hardness and chemical resistance, are thereby improved.
Inventors
- 👤 Robert Arthur Taller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:48
CPC Classifications
C; C09; C09D; C09D175/00; C09D175/04; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C08K5/00; C08K5/0008; C08K5/0041
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
48 words
In the process of producing a pigmented two-package urethane coating, the improvement which comprises: a. forming a slurry predispersion of the pigment in an amount of an organic polyisocyanate from 0.5 to 50% by weight of the pigment; then b. dispersing the slurry predispersion in the polyol package.
Claim 2
Dependent Claim
48 words
In the process of producing a pigmented two-package urethane coating, the improvement which comprises: a. forming a slurry predispersion of the pigment in an amount of an organic polyisocyanate from 0.5 to 50% by weight of the pigment; then b. dispersing the slurry predispersion in the polyol package.
Claim 3
Dependent Claim
28 words
A process as claimed in claim 1, wherein there is employed from 1 to 25% by weight of the pigment of the organic polyisocyanate to form the slurry.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1, wherein the polyol package comprises a polycaprolactone polyol.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1, wherein the polyol package comprises a polyester polyol.
Claim 6
Dependent Claim
31 words
A process as claimed in claim 1, wherein said organic polyisocyanate is chosen from the group consisting of 4,4'-methylene bis(cyclohexyl isocyanate), tolylene diisocyanate, isophorone diisocyanate and the biuret of 1,6-hexamethylene diisocyanate.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 1, wherein said organic polyisocyanate is 4,4'-methylene bis(cyclohexyl isocyanate).
Claim 8
Dependent Claim
13 words
A process as claimed in claim 1, wherein the pigment is titanium dioxide.
Claim 9
Dependent Claim
42 words
A pigmented polyol composition, suitable for use in the production of polyurethane coatings, comprising an organic polyol having dispersed therein a slurry predispersion of a pigment in an amount of an organic polyisocyanate from 0.5 to 50% by weight of the pigment.
Claim 10
Dependent Claim
42 words
A pigmented polyol composition, suitable for use in the production of polyurethane coatings, comprising an organic polyol having dispersed therein a slurry predispersion of a pigment in an amount of an organic polyisocyanate from 0.5 to 50% by weight of the pigment.
Claim 11
Dependent Claim
31 words
A pigmented polyol composition as claimed in claim 8, wherein the amount of organic polyisocyanate employed in said slurry predispersion is from 1 to 25% by weight of the said pigment.
Claim 12
Dependent Claim
32 words
A pigmented polyol composition as claimed in claim 8, wherein said organic polyisocyanate is chosen from the group consisting of 4,4'-methylene bis(cyclohexyl), tolylene diisocyanate, isophorone diisocyanate and the biuret of 1,6-hexamethylene diisocyanate.
Claim 13
Dependent Claim
17 words
A pigmented polyol composition as claimed in claim 8, wherein said organic polyisocyanate is 4,4'-methylene bis(cyclohexyl isocyanate).
Claim 14
Dependent Claim
15 words
A pigmented polyol composition as claimed in claim 8, wherein said pigment is titanium dioxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |