Patent US4919875A successfully refreshed from Google Patents.
US4919875A
Expired / Lapsed
US
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Oriented polymeric tape preparation
Assignee: DYMETROL COMPANY Inc
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Filing: 1989-04-06
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Granted: 1990-04-24
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Expires: 2009-04-06
Abstract
Abstract A process for the preparation of oriented polymeric tape of a blend of copolyetherester and polyethylene terephthalate, by blending the components at a temperature above the higher crystalline melting point of the two polymeric components for a minimum melt residence time.
Inventors
- 👤 Teh-Chuan Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:33
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/04; B29C55/06; B29C48/00; B29C48/022; B29C48/03; B29C48/07; B29K; B29K2067/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
A process for the preparation of polymeric tape which comprises melt blending about from 90 to 50 weight percent copolyetherester and, complement ally, about from 10 to 50 weight percent polyethylene terephthalate at a temperature which is about from 25 to 65 centigrade degrees above the higher crystalline melting point of the two polymeric components for a melt residence period of about from 70 to 225 seconds, extruding the polymer blend through a die orifice in the form of tape, and orienting the tape to provide an increase in the longitudinal dimension of about from 2.2 to 4.0 times the original extruded dimension of the tape, the blending temperatures and melt residence period being sufficient to change the appearance of the melt blend from opaque to translucent.
Claim 2
Dependent Claim
127 words
A process for the preparation of polymeric tape which comprises melt blending about from 90 to 50 weight percent copolyetherester and, complement ally, about from 10 to 50 weight percent polyethylene terephthalate at a temperature which is about from 25 to 65 centigrade degrees above the higher crystalline melting point of the two polymeric components for a melt residence period of about from 70 to 225 seconds, extruding the polymer blend through a die orifice in the form of tape, and orienting the tape to provide an increase in the longitudinal dimension of about from 2.2 to 4.0 times the original extruded dimension of the tape, the blending temperatures and melt residence period being sufficient to change the appearance of the melt blend from opaque to translucent.
Claim 3
Dependent Claim
23 words
A process of claim 1 wherein the tape is oriented about from 2.2 to 3.0 times the original longitudinal dimension of the tape.
Claim 4
Dependent Claim
12 words
A process of claim 1 wherein the tape is oriented by rolling.
Claim 5
Dependent Claim
26 words
A process of claim 1 wherein the polymer blend is blended at the elevated temperature for a melt residence period about from 80 to 160 seconds.
Claim 6
Dependent Claim
31 words
A process of claim 1 wherein the polymers are blended at a temperature about from 30 to 55 centigrade degrees above the higher crystalline melting point of the two polymeric components.
Claim 7
Dependent Claim
23 words
A process of claim 1 wherein the polymer blend has a temperature of about from 285° to 310° C. at the die orifice.
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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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |