US4153659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enhancing solvent barrier property of pigmented polymeric bodies
Assignee: Air Products and Chemicals Inc
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Filing: 1977-08-01
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Granted: 1979-05-08
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Expires: 1997-08-01
Abstract
Abstract The solvent barrier property of pigmented, solid polymeric articles is improved by pretreating the pigment particles prior to incorporation into the solid polymeric material so as to remove trapped gas from the surface and interstices of the pigment particles. Specific techniques for accomplishing this result include heating the pigment particles to a temperature above about 50° C., but below the calcination temperature, scrubbing the pigment particles with an inert gas and subjecting the pigment particles to a vacuum.
Inventors
- 👤 Gerald W. Recktenwald
- 👤 Larry J. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:30
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/04; C08; C08J; C08J7/00; C08J7/12; C08K; C08K9/00; C09B; C09B67/00; C09B67/0001; C09C1/00; C09C1/36; C09C1/3607; C09C1/3615; C01; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
A process for improving the solvent barrier property of a pigmented article composed of a solid polymeric material, which process comprises pretreating pigment particles prior to incorporation into the polymeric material so as to remove trapped gas from the surfaces and interstices of the pigment particles, admixing the pretreated pigment particles with the polymeric material, forming the article from the mixture of pretreated pigment and polymeric material, and subjecting the pigmented article to a treatment with fluorine gas.
Claim 2
Dependent Claim
78 words
A process for improving the solvent barrier property of a pigmented article composed of a solid polymeric material, which process comprises pretreating pigment particles prior to incorporation into the polymeric material so as to remove trapped gas from the surfaces and interstices of the pigment particles, admixing the pretreated pigment particles with the polymeric material, forming the article from the mixture of pretreated pigment and polymeric material, and subjecting the pigmented article to a treatment with fluorine gas.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the pigment particles are pretreated by being subjected to a temperature above about 50° C. and below the decomposition temperature of the pigment.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the pigment particles are pretreated by scrubbing with an inert gas.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the pigment particles are pretreated by being subject to a vacuum of less than about 50 Torrs.
Claim 6
Dependent Claim
34 words
The process of claim 2 wherein the pigment particles are pretreated at a temperature from about 50° to about 750° C. for a period of time from about 2 minutes to about 24 hours.
Claim 7
Dependent Claim
19 words
The process of claim 5 wherein the temperature is in the range from about 75° to about 300° C.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein the pretreated pigment particles are admixed with polymeric material maintained at a temperature above the softening point of the polymeric material.
Claim 9
Dependent Claim
23 words
The process of claim 3 wherein the scrubbing is effected by employing the gas to maintain the pigment particles in a fluidized bed.
Claim 10
Dependent Claim
77 words
A process for improving the solvent barrier property of a pigmented article composed of a solid polymeric material, which process comprises pretreating pigment particles prior to incorporation into the polymeric material so as to remove trapped gas from the surfaces and interstices of the pigment particles, admixing the pretreated pigment particles with the polymeric material, and then forming the article from the mixture of pretreated pigment and polymeric material by blow molding with a fluorine-containing blowing gas.
Claim 11
Dependent Claim
77 words
A process for improving the solvent barrier property of a pigmented article composed of a solid polymeric material, which process comprises pretreating pigment particles prior to incorporation into the polymeric material so as to remove trapped gas from the surfaces and interstices of the pigment particles, admixing the pretreated pigment particles with the polymeric material, and then forming the article from the mixture of pretreated pigment and polymeric material by blow molding with a fluorine-containing blowing gas.
Claim 12
Dependent Claim
29 words
The process of claim 9 wherein the pigment particles are pretreated by being subjected to a temperature above about 50° C. and below the decomposition temperature of the pigment.
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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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |