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Patent US4478971A successfully refreshed from Google Patents.
US4478971A
Expired / Lapsed
US
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High temperature extruded polyvinyl alcohol monofilament and process for the preparation thereof
Assignee: Shakespeare and Company
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Filing: 1983-07-08
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Granted: 1984-10-23
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Expires: 2003-07-08
Abstract
Abstract The invention disclosed herein provides a process for the high temperature extrusion of polyvinyl alcohol monofilament soluble in water comprising the steps of blending from about 80 to 98 percent by weight polyvinyl alcohol resin having a number average molecular weight of from about 10,000 to 200,000 and a degree of hydrolysis of from about 85 to 91 percent with from about 20 to 2 percent by weight of a plasticizer selected from the group consisting of hydroxyethers, diols, triols and other polyols and mixtures thereof, reducing the moisture content of the resin to a level of less than about one percent and the volatile content thereof to a level of less than about two percent and, melt extruding the blend to form monofilaments. A novel high temperature extruded polyvinyl alcohol monofilament, soluble in water, comprises from about 80 to 98 percent by weight polyvinyl alcohol resin having a number average molecular weight of from about 10,000 to 200,000 and a degree of hydrolysis of from about 85 to 91 percent and from about 20 to 2 percent by weight of a plasticizer selected from the group consisting of hydroxyethers having an average molecular weight of less than 325 and greater than 550 and having the formula <IMAGE> wherein R is hydrogen or methyl and R1 is hydrogen, an alkyl group having from one to about 12 carbons and aromatic groups having from six to about 10 carbon atoms and n is an integer that will provide the aforementioned average molecular weight, diols, triols and other polyols having from two to about 10 carbons including mixtures thereof.
Inventors
- 👤 Larry Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:47
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/05; C; C08; C08K; C08K5/00; C08K5/04; C08K5/06
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
218 words
A process for the high temperature extrusion of polyvinyl alcohol monofilament soluble in water comprising the steps of: blending from about 80 to 98 percent by weight of a previously hydrolyzed polyvinyl alcohol resin having a number average molecular weight of from about 10,000 to 200,000 and a degree of hydrolysis of from about 85 to 96 percent with from about 20 to 2 percent by weight of a plasticizer selected from the group consisting of hydroxyethers having an average molecular weight of less than 325 and greater than 550 and having the formula ##STR6## wherein R is hydrogen or methyl and R 1 is hydrogen, an alkyl group having from one to about 12 carbons and aromatic groups having from six to about 10 carbon atoms and n is an integer that will provide said average molecular weight, diols, triols and other polyols having from two to about 10 carbons and mixtures thereof; reducing the moisture content of said resin to a level of less than about one percent and the volatile content thereof to a level of less than about two percent; and extruding said blend to form monofilaments; wherein said monofilaments have a tenacity of from about 1.0 to 5.0 grams per denier and an elongation at break of from about five to 50 percent.
Claim 2
Dependent Claim
218 words
A process for the high temperature extrusion of polyvinyl alcohol monofilament soluble in water comprising the steps of: blending from about 80 to 98 percent by weight of a previously hydrolyzed polyvinyl alcohol resin having a number average molecular weight of from about 10,000 to 200,000 and a degree of hydrolysis of from about 85 to 96 percent with from about 20 to 2 percent by weight of a plasticizer selected from the group consisting of hydroxyethers having an average molecular weight of less than 325 and greater than 550 and having the formula ##STR6## wherein R is hydrogen or methyl and R 1 is hydrogen, an alkyl group having from one to about 12 carbons and aromatic groups having from six to about 10 carbon atoms and n is an integer that will provide said average molecular weight, diols, triols and other polyols having from two to about 10 carbons and mixtures thereof; reducing the moisture content of said resin to a level of less than about one percent and the volatile content thereof to a level of less than about two percent; and extruding said blend to form monofilaments; wherein said monofilaments have a tenacity of from about 1.0 to 5.0 grams per denier and an elongation at break of from about five to 50 percent.
Claim 3
Dependent Claim
36 words
The process, as set forth in claim 1, wherein said resin has a number average molecular weight ranging from about 10,000 to about 100,000, and a degree of hydrolysis of from about 86 to 91 percent.
Claim 4
Dependent Claim
13 words
The process, as set forth in claim 1, wherein said plasticizer is glycerin.
Claim 5
Dependent Claim
14 words
The process, as set forth in claim 1, wherein said plasticizer is ethylene glycol.
Claim 6
Dependent Claim
14 words
The process, as set forth in claim 1, wherein said plasticizer is trimethylol propane.
Claim 7
Dependent Claim
15 words
The process, as set forth in claim 1, wherein said plasticizer has the formula ##STR7##
Claim 8
Dependent Claim
29 words
The process, as set forth in claim 1, wherein the step of reducing moisture includes the step of: drying the resin-plasticizer blend at a temperature of about 85° C.
Claim 9
Dependent Claim
18 words
The process, as set forth in claim 7, including the further step of applying a vacuum while drying.
Claim 10
Dependent Claim
35 words
The process, as set forth in claim 1, wherein the step of reducing moisture includes the step of: drying said resin under a vacuum at a temperaure of from about 20° to about 150° C.
Claim 11
Dependent Claim
30 words
The process, as set forth in claim 1, including the additional steps of: quenching, orienting and heat setting said monofilament after extruding and, thereafter winding said monofilament onto a spool.
Claim 12
Dependent Claim
23 words
The process, as set forth in claim 10, wherein said step of quenching includes the step of passing said extruded monofilament through air.
Claim 13
Dependent Claim
36 words
The process, as set forth in claim 10, wherein said step of quenching includes the step of passing said extruded monofilament through a liquid selected from the group consisting of oil, water and aqueous salt solutions.
Claim 14
Dependent Claim
34 words
The process, as set forth in claim 1, wherein said blending is done at a temperature of from about 65° C. to 150° C. and for a period of between 5 to 30 minutes.
Claim 15
Dependent Claim
23 words
The process, as set forth in claim 1, wherein said tenacity of said monofilaments is from about 1.5 to 3.0 grams per denier.
Claim 16
Dependent Claim
23 words
The process, as set forth in claim 1, wherein said elongation at break of said monofilaments is from about 10 to 30 percent.
Claim 17
Dependent Claim
190 words
A high temperature extruded polyvinyl alcohol monofilament soluble in water comprising: from about 80 to 98 percent by weight polyvinyl alcohol resin having a number average molecular weight of from about 10,000 to 200,000 and a degree of hydrolysis of from about 85 to 96 percent and, from about 20 to 2 percent by weight of a plasticizer selected from the group consisting of hydroxyethers having an average molecular weight of less than 325 and greater than 550 and having the formula ##STR8## wherein R is hydrogen or methyl and R 1 is hydrogen, an alkyl group having from one to about 12 carbons and aromatic groups having from six to about 10 carbon atoms and n is an integer that will provide said average molecular weight, diols, triols and other polyols having from two to about 10 carbons and mixtures thereof the polyvinyl alcohol having been hydrolyzed prior to the addition of the plasticizer; wherein said high temperature extruded polyvinyl alcohol monofilament soluble in water has a tenacity of from about 1.0 to 5.0 grams per denier and an elongation at break of from about five to 50 percent.
Claim 18
Dependent Claim
190 words
A high temperature extruded polyvinyl alcohol monofilament soluble in water comprising: from about 80 to 98 percent by weight polyvinyl alcohol resin having a number average molecular weight of from about 10,000 to 200,000 and a degree of hydrolysis of from about 85 to 96 percent and, from about 20 to 2 percent by weight of a plasticizer selected from the group consisting of hydroxyethers having an average molecular weight of less than 325 and greater than 550 and having the formula ##STR8## wherein R is hydrogen or methyl and R 1 is hydrogen, an alkyl group having from one to about 12 carbons and aromatic groups having from six to about 10 carbon atoms and n is an integer that will provide said average molecular weight, diols, triols and other polyols having from two to about 10 carbons and mixtures thereof the polyvinyl alcohol having been hydrolyzed prior to the addition of the plasticizer; wherein said high temperature extruded polyvinyl alcohol monofilament soluble in water has a tenacity of from about 1.0 to 5.0 grams per denier and an elongation at break of from about five to 50 percent.
Claim 19
Dependent Claim
44 words
The high temperature extruded polyvinyl alcohol monofilament soluble in water, as set forth in claim 16, wherein said resin has a number average molecular weight ranging from about 10,000 to about 100,000, and a degree of hydrolysis of from about 86 to 91 percent.
Claim 20
Dependent Claim
21 words
The high temperature extruded polyvinyl alcohol monofilament soluble in water, as set forth in claim 14, wherein said plasticizer is glycerin.
Claim 21
Dependent Claim
22 words
The high temperature extruded polyvinyl alcohol monofilament soluble in water, as set forth in claim 14, wherein said plasticizer is ethylene glycol.
Claim 22
Dependent Claim
22 words
The high temperature extruded polyvinyl alcohol monofilament soluble in water, as set forth in claim 14, wherein said plasticizer is trimethylol propane.
Claim 23
Dependent Claim
23 words
The high temperature extruded polyvinyl alcohol monofilament soluble in water, as set forth in claim 14, wherein said plasticizer has the formula ##STR9##
Claim 24
Dependent Claim
26 words
The high temperature extruded polyvinyl alcohol monofilament soluble in water, as set forth in claim 16, wherein said monofilament is soluble in water at 25° C.
Claim 25
Dependent Claim
31 words
The high temperature extruded polyvinyl alcohol monofilament soluble in water, as set forth in claim 16, wherein the tenacity of said monofilament is from about 1.5 to 3.0 grams per denier.
Claim 26
Dependent Claim
31 words
The high temperature extruded polyvinyl alcohol monofilament soluble in water, as set forth in claim 16, wherein the elongation at break of said monofilaments is from about 10 to 30 percent.
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |