Patent US4219639A successfully refreshed from Google Patents.
US4219639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent and translucent poly(butene-1)
Assignee: ConocoPhillips Co
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Filing: 1978-08-16
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Granted: 1980-08-26
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Expires: 1998-08-16
Abstract
Abstract A method for altering the transparency of a stable hexagonal polymorphic poly(butene-1) obtained from unstable tetragonal crystalline poly(butene-1) comprising contacting the tetragonal crystalline poly(butene-1) with a volatile solvent for a short time, then removing from the solvent, and allowing solvent adhereing to the poly(butene-1) to evaporate. The finished polymer can be opaque, transparent, or translucent depending upon the solvent and temperature used.
Inventors
- 👤 Mark P. Mack
- 👤 William J. Libbey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:39
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02; C08J2323/00; C08J2323/02; C08J2323/18; C08J2323/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
47 words
A method for obtaining a stable transparent hexagonal poly(butene-1) comprising placing said polybutene-1 in an unstable tetragonal crystallite form and contacting said unstable polybutene-1 with a volatile non-polar solvent having an effective reflux temperature of about 40° C. to about 140° C. and immediately evaporating the solvent.
Claim 2
Independent Claim
47 words
A method for obtaining a stable transparent hexagonal poly(butene-1) comprising placing said polybutene-1 in an unstable tetragonal crystallite form and contacting said unstable polybutene-1 with a volatile non-polar solvent having an effective reflux temperature of about 40° C. to about 140° C. and immediately evaporating the solvent.
Claim 3
Dependent Claim
20 words
A method as described in claim 1 wherein the contact temperature is from about 50° C. to about 90° C.
Claim 4
Dependent Claim
19 words
A method as described in claim 2 wherein the solvent is within 5 degrees of reflux at contact pressure.
Claim 5
Dependent Claim
29 words
A method as described in claim 2 wherein the solvent is selected from the group consisting of n-hexane, n-pentane, n-heptane, n-octane, diethyl ether, diisopropyl ether, n-butane, n-nonane and n-decane.
Claim 6
Dependent Claim
24 words
A method as described in claim 4 wherein the solvent is selected from the group consisting of n-pentane, n-heptane, n-hexane, n-octane, and diisopropyl ether.
Claim 7
Independent Claim
46 words
A method for obtaining a stable translucent hexagonal poly(butene-1) comprising placing said poly(butene-1) in an unstable tetragonal crystalline form and contacting said unstable poly(butene-1) with a volatile non-polar solvent having an effective reflux temperature of about 0° to about 40° C. and immediately evaporating the solvent.
Claim 8
Independent Claim
46 words
A method for obtaining a stable translucent hexagonal poly(butene-1) comprising placing said poly(butene-1) in an unstable tetragonal crystalline form and contacting said unstable poly(butene-1) with a volatile non-polar solvent having an effective reflux temperature of about 0° to about 40° C. and immediately evaporating the solvent.
Claim 9
Dependent Claim
32 words
A method as described in claim 6 wherein the solvent is selected from the group consisting of n-hexane, n-heptane, n-pentane, n-octane, cyclohexane, diethyl ether, diisopropyl ether, n-nonane, n-decane, n-butane, propane and ethane.
Claim 10
Dependent Claim
21 words
A method as described in claim 7 wherein the poly(butene-1) is a copolymer or blend containing at least about 90% poly(butene-1).
Claim 11
Dependent Claim
29 words
A method as described in claim 8 wherein the copolymer is formed by monomers selected from the group consisting of propylene, ethylene, 4-methyl-1-pentene and mixtures of these with butene.
Claim 12
Dependent Claim
32 words
A method as described in claim 9 wherein the poly(butene-1) is blended with a polymer selected from the group consisting of polyesters, polyamides, polyaramides, polyethylene, polypropylene, polyurethanes, polypropyleneoxides or mixtures of these.
Claim 13
Dependent Claim
15 words
A method as described in claim 6 wherein the polybutene-1 is contacted as a film.
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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |