UST864005I4 - Method and apparatus for continuously producing spinnino dopes of spandex polymers - Google Patents
Method and apparatus for continuously producing spinnino dopes of spandex polymers Download PDFInfo
- Publication number
- UST864005I4 UST864005I4 US864005DH UST864005I4 US T864005 I4 UST864005 I4 US T864005I4 US 864005D H US864005D H US 864005DH US T864005 I4 UST864005 I4 US T864005I4
- Authority
- US
- United States
- Prior art keywords
- dopes
- continuously producing
- spinnino
- spandex
- spandex polymers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/0838—Manufacture of polymers in the presence of non-reactive compounds
- C08G18/0842—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents
- C08G18/0847—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers
Definitions
- a method for continuously producing, in dope form, a spandex polymer having a relatively low Mw/Mn ratio including the steps of (I) initially preparing independent reactant solutions of the spandex prepolymer and the chain extender; (2) introducing the separate reactant solutions in a continuous manner to a mixing area; (3) intimately, rapidly and continuously mixing the reactant solutions in the mixing area; (4) flowing the mixed reactant solutions from the mixing area to a holdup area prior to the spandex reaction becoming more than 75% comf 1 u a 5 8 FY i6 27 2 t plete; and (5) permitting the intimately mixed reactant solutions to complete their reaction in the holdup area with no further agitation.
- Apparatus including a mixing chamber with a high speed impeller, and including reactant inlets, a holding tank, and a connector between the misting chamber and holdup tank that is preferably adapted to provide plug flow between the chamber and the tank.
- the plug how is created by contraction of the discharge from the mixing chamber opening into the holding tank to produce a back pressure.
- the discharge from the holding tank is cemented to ametering pump for delivering the continuously formed spandex dope to one or more fiber thinning machines.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Artificial Filaments (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Description
ClllA XR 1' 8641005 M g DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request or the applicant or owner in accordance with the Notice of Apr. 11, 186B, 849 00. 122i. Identiflcation is by serial number of the application and the heading indicates the number or pages or specification, including claims, and of sheets of'drawing contained in the application as originally died. The tile or this application is available to the public tor inspection; reproduction may be purchased for 80 cents per sheet.
Applications published under the Detensive Publication Program have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.
PUBLISHED JULY 15, 1969 METHOD AND APPARATUS FOR CONTINUOUSLY PRODUCING SPINNING DOPES 0F SPANDEX POLYMERS William M. McSpadden, In, and Frederick W. Voigt, In,
both of E0. Box 511, Klngspor Tenn. 37662 Filed Nov. 20, 1968. Published uly I5, 1969 Int. Cl. CttBg 35/00, 22/04 [1.5. Cl. 260-775 I Sheet Drawing. 19 Pages Specification A method for continuously producing, in dope form, a spandex polymer having a relatively low Mw/Mn ratio including the steps of (I) initially preparing independent reactant solutions of the spandex prepolymer and the chain extender; (2) introducing the separate reactant solutions in a continuous manner to a mixing area; (3) intimately, rapidly and continuously mixing the reactant solutions in the mixing area; (4) flowing the mixed reactant solutions from the mixing area to a holdup area prior to the spandex reaction becoming more than 75% comf 1 u a 5 8 FY i6 27 2 t plete; and (5) permitting the intimately mixed reactant solutions to complete their reaction in the holdup area with no further agitation.
Apparatus including a mixing chamber with a high speed impeller, and including reactant inlets, a holding tank, and a connector between the misting chamber and holdup tank that is preferably adapted to provide plug flow between the chamber and the tank. The plug how is created by contraction of the discharge from the mixing chamber opening into the holding tank to produce a back pressure. The discharge from the holding tank is cemented to ametering pump for delivering the continuously formed spandex dope to one or more fiber thinning machines.
July 15, 1969 A w. M. MOSPADDEN. JR, ETAL DEF. Pua.
METHOD AND APPARATUS FOR CONTINUOUSLY PRODUCING SPINNING DOPBS F SPANDEX POLYMERS Filed Nov. 20, 196B .366. William M. M08:
Frederick W. V0 1 Lx'vux'rams can mar r/m',
ATTORNEYS
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US77742068A | 1968-11-20 | 1968-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| UST864005I4 true UST864005I4 (en) | 1969-07-15 |
Family
ID=25110212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US864005D Pending UST864005I4 (en) | 1968-11-20 | 1968-11-20 | Method and apparatus for continuously producing spinnino dopes of spandex polymers |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | UST864005I4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0579979A2 (en) * | 1992-07-10 | 1994-01-26 | Bayer Ag | Process for the production of spandex polymer spinning solutions, with stabilized viscosity and low gel content |
-
1968
- 1968-11-20 US US864005D patent/UST864005I4/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0579979A2 (en) * | 1992-07-10 | 1994-01-26 | Bayer Ag | Process for the production of spandex polymer spinning solutions, with stabilized viscosity and low gel content |
| EP0579979A3 (en) * | 1992-07-10 | 1994-11-30 | Bayer Ag | Process for the production of spandex polymer spinning solutions, with stabilized viscosity and low gel content. |
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