Patent US4414386A successfully refreshed from Google Patents.
US4414386A
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US
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Precipitation of polycycloolefins having high bulk density
Assignee: Goodrich Corp
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Filing: 1982-05-10
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Granted: 1983-11-08
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Expires: 2002-05-10
Abstract
Abstract A polymer is precipitated from a cement containing the polymer dissolved in a nonpolar solvent by mixing the cement with a nonsolvent alcohol and water wherein the relative amount of water to the alcohol is different from the alcohol/water azeotropic composition and being such as to produce a polymer product in the form of discrete particles, the product having bulk density in excess of 0.08 g/cc or 5 lb/ft3, is capable of being easily filtered and dried, and is a polymer of a monomer that contains at least one norbornene group.
Inventors
- 👤 Parley C. Lane, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:24
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
Process for precipitating a polymer from a cement comprising said polymer dissolved in a solvent, said process comprising mixing said cement with a sufficient amount of a nonsolvent alcohol containing 2 to 8 carbon atoms and water to precipitate said polymer thus forming a polymer slurry containing said polymer solids dispersed in a liquid medium containing said solvent, water, and said nonsolvent alcohol, and separating said polymer from said liquid medium, amount of water relative to said nonsolvent alcohol being different from the azeotropic composition of said alcohol and water but being in relative proportion necessary to produce product in the form of discrete particles having bulk density in excess of 0.08 g/cc that can be easily filtered and dried, and said polymer is a reaction product formed by ring opening polymerization of at least one norbornene-type monomer.
Claim 2
Dependent Claim
138 words
Process for precipitating a polymer from a cement comprising said polymer dissolved in a solvent, said process comprising mixing said cement with a sufficient amount of a nonsolvent alcohol containing 2 to 8 carbon atoms and water to precipitate said polymer thus forming a polymer slurry containing said polymer solids dispersed in a liquid medium containing said solvent, water, and said nonsolvent alcohol, and separating said polymer from said liquid medium, amount of water relative to said nonsolvent alcohol being different from the azeotropic composition of said alcohol and water but being in relative proportion necessary to produce product in the form of discrete particles having bulk density in excess of 0.08 g/cc that can be easily filtered and dried, and said polymer is a reaction product formed by ring opening polymerization of at least one norbornene-type monomer.
Claim 3
Dependent Claim
40 words
Process of claim 1 wherein the relative amount of said alcohol and water to said cement is in the range of about 2/1 to 15/1, on volume basis, and wherein said solvent is miscible with water and said nonsolvent alcohol.
Claim 4
Dependent Claim
33 words
Process of claim 2 wherein said polymer has dilute solution viscosity of about 0.1 to 3 and it is selected from homopolymers, copolymers and terpolymers of methylnorbornene (MNB), methyltetracyclododecene (MTD), and dicyclopentadiene (DCPD).
Claim 5
Dependent Claim
25 words
Process of claim 2 wherein said cement is selected from nonpreconcentrated cements containing about 15% solids and preconcentrated cements containing at least about 20% solids.
Claim 6
Dependent Claim
39 words
Process of claim 3 wherein said alcohols are selected from saturated and unsaturated lower alcohols containing 2 to 5 carbon atoms, said precipitation being accomplished in the temperature range from above freezing to below boiling temperatures of the system.
Claim 7
Dependent Claim
42 words
Process of claim 5 wherein said copolymers contain 10 to 30% weight polymerized MNB with remainder being polymerized MTD and said terpolymers contain 1 to 45% by weight polymerized MNB, 50 to 98% by weight polymerized MTD, with remainder being polymerized DCPD.
Claim 8
Dependent Claim
54 words
Process of claim 5 wherein said solvent is selected from cyclic nonpolar solvents and wherein the relative amount of said alcohol and water to said cement is in the range of about 3/1 to 8/1, and said precipitation takes place at a temperature of approximately corresponding to the boiling point of the alcohol/water azeotrope.
Claim 9
Dependent Claim
47 words
Process of claim 6 wherein said alcohol is selected from ethanol, isopropanol, n-propanol, and mixtures thereof and the amount of said alcohol to water being about 90/10 for ethanol, about 80/20 to 60/40 for isopropanol and about 80/20 to 75/25 for n-propanol, all on a weight basis.
Claim 10
Dependent Claim
63 words
Process of claim 6 wherein the relative amount of said alcohol to water is such as to produce a slurry condition selected from B and C, after standing overnight, wherein the slurry conditions are defined as follows: B--particles settle to the bottom but do not stick together C--particles settle to the bottom and tend to stick together but can be reslurried with agitation.
Claim 11
Dependent Claim
43 words
Process of claim 9 wherein the relative amount of said alcohol to water is such as to produce slurry condition B; wherein said solvent is selected from cyclohexane, toluene, and benzene; and bulk density of said polymer is about 0.13 to 0.2 g/cc.
References Cited (Backward Citations)
US4069376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |