Patent US4462948A successfully refreshed from Google Patents.
US4462948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion process for preparing thermoplastic resin fiber
Assignee: Millennium Petrochemicals Inc
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Filing: 1982-03-05
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Granted: 1984-07-31
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Expires: 2002-03-05
Abstract
Abstract A process is disclosed for obtaining olefin-polar comonomer resin in fibrous form. According to the invention, an olefin-polar comonomer resin such as an ethylene-vinyl acetate copolymer is vigorously agitated in molten form in water in the presence of a resin dispersion-forming amount of an alkali metal soap such as sodium stearate and a fiber-forming amount of base such as sodium hydroxide at a temperature below the degradation temperature of the resin to provide a dispersion of said resin in which a substantial number of the individual resin particles are in the form of a fiber possessing an average length of from about 50 to about 2500 microns and an average length to diameter ratio of at least about 3:1. Following cooling of the dispersion to below the solidification point of the resin, the resin fiber may be recovered employing known and conventional means, e.g., filtration, centrifugation, etc.
Inventors
- 👤 Dorothee M. McClain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:39
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/05; D; D01; D01D; D01D5/00; D01D5/40; D04; D04H; D04H13/00; D21; D21H; D21H5/00; D21H5/12; D21H5/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
128 words
A process for obtaining olefin-polar comonomer resin in fibrous form which comprises vigorously agitating an olefin-polar-comonomer resin in molten form in water in the presence of a resin dispersion-forming amount of an alkali metal soap and a fiber-forming amount of base of from about 0.5 to about 10 parts by weight per 100 parts by weight of resin at a temperature below the degradation temperature of resin to provide a dispersion of said resin in which a substantial number of the individual resin particles are in the form of a fiber possessing an average length of from about 50 to about 2500 microns and an average length to diameter ratio of at least about 3:1 and thereafter cooling said dispersion to below the solidification point of the resin.
Claim 2
Dependent Claim
128 words
A process for obtaining olefin-polar comonomer resin in fibrous form which comprises vigorously agitating an olefin-polar-comonomer resin in molten form in water in the presence of a resin dispersion-forming amount of an alkali metal soap and a fiber-forming amount of base of from about 0.5 to about 10 parts by weight per 100 parts by weight of resin at a temperature below the degradation temperature of resin to provide a dispersion of said resin in which a substantial number of the individual resin particles are in the form of a fiber possessing an average length of from about 50 to about 2500 microns and an average length to diameter ratio of at least about 3:1 and thereafter cooling said dispersion to below the solidification point of the resin.
Claim 3
Dependent Claim
27 words
The proess of claim 1 wherein the olefin-polar comonomer resin is as ethylene-vinyl acetate copolymer containing from about 15 to about 85 weight percent inter-polymerized vinyl acetate.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the olefin-polar comonomer resin is an ethylene-vinyl acetate copolymer containing from about 20 to about 70 weight perent inter-polymerized vinyl acetate.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the alkali metal soap is sodium stearate.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the base is sodium hydroxide.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein a water-soluble salt is additionally present to positively influence fiber formation.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein the salt is sodium chloride.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein from about 0.8 to about 5 weight parts of base per 100 weight parts of resin are employed.
Claim 10
Dependent Claim
24 words
The process of claim 6 wherein from about 0.5 to about 20 weight parts of salt per 100 weight parts of resin are employed.
Claim 11
Dependent Claim
23 words
The process of claim 6 wherein from 2 to about 15 weight parts of salt per 100 weight parts of resin are employed.
Claim 12
Dependent Claim
29 words
The process of claim 1 wherein at least 50% of the resin particles resulting from the process possess an average length to diameter ratio of at least about 3:1.
Claim 13
Dependent Claim
30 words
The process of claim 1 wherein at least about 80% of the resin particles resulting from the process possess an average length to diameter ratio of at least about 5:1.
Claim 14
Dependent Claim
15 words
The process of claim 1 wherein the fiber particles are recovered from the dispersion medium.
Claim 15
Dependent Claim
30 words
The process of claim 1 wherein the ratio of resin to water ranges from about 0.1 to about 3 parts of resin per part of water on a weight basis.
Claim 16
Dependent Claim
23 words
The process of claim 1 wherein the dispersion temperature ranges from about 100° C. to about 300° C. and the pressure is autogeneous.
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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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |