US4266542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
EVA Formulation having improved properties
Assignee: Baxter International Inc
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Filing: 1978-12-14
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Granted: 1981-05-12
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Expires: 1998-12-14
Abstract
Abstract A thermoplastic composition is disclosed which consists essentially of a major portion of a first poly(ethylene-vinyl acetate) copolymer which contains from 22 to 30 percent by weight of vinyl acetate units and exhibits a melt index as defined herein of 0.5 to 10. A minor portion of a second poly(ethylene-vinyl acetate) copolymer is included which contains from 25 to 40 percent by weight of vinyl acetate units, the second copolymer exhibiting a melt index of 20 to 1000. The resulting formulation exhibits numerous good properties for use in medical devices, coupled with the capacity for radiation sterilization.
Inventors
- 👤 Lawrence F. Becker
- 👤 Leonard F. Czuba
- 👤 Dean G. Laurin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:52
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/04; A61L29/049; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L2205/00; C08L2205/02; C08L2205/025
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
A thermoplastic composition which consists essentially of: (a) from 75 to 90 percent by weight of a first poly(ethylene-vinyl acetate) copolymer which contains from 22 to 30 percent by weight of vinyl acetate units, said first copolymer exhibiting a melt index of 0.5 to 10; and (b) from 10 to 25 percent by weight of a second poly(ethylene-vinyl acetate) copolymer which contains from 25 to 40 percent by weight of vinyl acetate units, said second copolymer exhibiting a melt index of 20 to 1000.
Claim 2
Dependent Claim
84 words
A thermoplastic composition which consists essentially of: (a) from 75 to 90 percent by weight of a first poly(ethylene-vinyl acetate) copolymer which contains from 22 to 30 percent by weight of vinyl acetate units, said first copolymer exhibiting a melt index of 0.5 to 10; and (b) from 10 to 25 percent by weight of a second poly(ethylene-vinyl acetate) copolymer which contains from 25 to 40 percent by weight of vinyl acetate units, said second copolymer exhibiting a melt index of 20 to 1000.
Claim 3
Dependent Claim
22 words
The composition of claim 1 in which said second copolymer contains from 35 to 40 percent by weight of vinyl acetate units.
Claim 4
Dependent Claim
29 words
The composition of claim 1 in which said second copolymer contains less than 35 percent by weight of vinyl acetate units and its melt index is at least 30.
Claim 5
Dependent Claim
19 words
The composition of claim 1 in which the melt index of said second copolymer is no more than 400.
Claim 6
Dependent Claim
28 words
The composition of claim 1 in which said first copolymer contains 28 percent by weight of vinyl acetate units and has a melt index of 1 to 2.
Claim 7
Dependent Claim
28 words
The composition of claim 5 in which said second copolymer has a vinyl acetate content of 33 percent by weight, and a melt index of 35 to 50.
Claim 8
Dependent Claim
23 words
The composition of claim 6 in which essentially 80 percent of said first copolymer and 20 percent of said second copolymer are present.
Claim 9
Dependent Claim
132 words
A set for administering medical fluid to a patient which comprises a length of flexible tubing, means for communication of said tubing at one end with a source of medical liquid, and means for communication of said tubing at its other end with the patient, said tubing comprising a thermoplastic composition which consists essentially of: (a) from 75 to 90 percent by weight of a first poly(ethylene-vinyl acetate) copolymer which contains from 22 to 30 percent by weight of vinyl acetate units, said first copolymer exhibiting a melt index of 0.5 to 10; and (b) from 10 to 25 percent by weight of a second poly(ethylene-vinyl acetate) copolymer which contains from 25 to 40 percent by weight of vinyl acetate units, said second copolymer exhibiting a melt index of 20 to 1000.
Claim 10
Dependent Claim
132 words
A set for administering medical fluid to a patient which comprises a length of flexible tubing, means for communication of said tubing at one end with a source of medical liquid, and means for communication of said tubing at its other end with the patient, said tubing comprising a thermoplastic composition which consists essentially of: (a) from 75 to 90 percent by weight of a first poly(ethylene-vinyl acetate) copolymer which contains from 22 to 30 percent by weight of vinyl acetate units, said first copolymer exhibiting a melt index of 0.5 to 10; and (b) from 10 to 25 percent by weight of a second poly(ethylene-vinyl acetate) copolymer which contains from 25 to 40 percent by weight of vinyl acetate units, said second copolymer exhibiting a melt index of 20 to 1000.
Claim 11
Dependent Claim
22 words
The set of claim 8 in which said second copolymer contains from 35 to 40 percent by weight of vinyl acetate units.
Claim 12
Dependent Claim
29 words
The set of claim 8 in which said second copolymer contains less than 35 percent by weight of vinyl acetate units and its melt index is at least 30.
Claim 13
Dependent Claim
19 words
The set of claim 8 in which the melt index of said second copolymer is no more than 400.
Claim 14
Dependent Claim
28 words
The set of claim 8 in which said first copolymer contains 28 percent by weight of vinyl acetate units and has a melt index of 1 to 2.
Claim 15
Dependent Claim
28 words
The set of claim 8 in which said second copolymer has a vinyl acetate content of 33 percent by weight, and a melt index of 35 to 50.
Claim 16
Dependent Claim
23 words
The set of claim 8 in which essentially 80 percent of said first copolymer and 20 percent of said second copolymer are present.
References Cited (Backward Citations)
US3402223A
Cited
US3770852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |