US4048255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blend of thermoelastic polymers with block radial polymers used as pharmaceutical sealing and resealing materials
Assignee: Abbott Laboratories
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Filing: 1975-08-26
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Granted: 1977-09-13
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Expires: 1995-08-26
Abstract
Abstract Radial block copolymers are blended with additional polymeric materials to form rubber-like plastic compositions having high elastic and reseal properties so that they can be utilized as a rubber replacement in the fabrication of resealable injecton sites in intravenous administration equipment and stoppers for containers where resealability after puncture is also a desirable property.
Inventors
- 👤 Edward Lawrence Hillier
- 👤 Glen Henry Graham
- 👤 Warren Evan Eichelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:19
CPC Classifications
C; C08; C08L; C08L53/00; C08L53/02; Y; Y10; Y10S; Y10S525/00; Y10S525/901
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
145 words
A radial block copolymer mixture having a high degree of resealability and noncoring properties consisting essentially of (a) from about 10 - 90% by weight of a butadiene-styrene radial block copolymer having a butadiene content in the range of about 85 - 60% by weight and a styrene content in the range of about 15 - 40% by weight, (b) from about 90 - 10% by weight of a butadiene-styrene radial block copolymer having a differing butadiene content in the range of about 85 - 60% by weight and a styrene content in the range of about 15 - 40% by weight and (c) about 3 - 75% by weight of said block copolymer mixture of chlorinated polyethylene, which results in a nonclear composition, both said radial block copolymers having an average molecular weight of at least 150,000 as measured by inherent viscosity in toluene.
Claim 2
Dependent Claim
145 words
A radial block copolymer mixture having a high degree of resealability and noncoring properties consisting essentially of (a) from about 10 - 90% by weight of a butadiene-styrene radial block copolymer having a butadiene content in the range of about 85 - 60% by weight and a styrene content in the range of about 15 - 40% by weight, (b) from about 90 - 10% by weight of a butadiene-styrene radial block copolymer having a differing butadiene content in the range of about 85 - 60% by weight and a styrene content in the range of about 15 - 40% by weight and (c) about 3 - 75% by weight of said block copolymer mixture of chlorinated polyethylene, which results in a nonclear composition, both said radial block copolymers having an average molecular weight of at least 150,000 as measured by inherent viscosity in toluene.
Claim 3
Dependent Claim
42 words
The radial block copolymer mixture as defined in claim 1 wherein said (a) and (b) portions of said radial block copolymer mixture are present in a ratio of about three parts of the (a) portion to one part of the (b) portion.
Claim 4
Dependent Claim
63 words
The radial block copolymer as defined in claim 1 wherein the amount of butadiene in said (a) portion of said radial block copolymer mixture is 70% by weight and said styrene amount is 30% by weight and wherein the amount of butadiene in said (b) portion of said radial block copolymer mixture is 60% by weight and said styrene is 40% by weight.
Claim 5
Dependent Claim
25 words
The radial block copolymer mixture as defined in claim 1 wherein said polymeric material is a mixture of polyolefin-butyl rubber graft copolymer and chlorinated polyethylene.
Claim 6
Dependent Claim
21 words
The radial block copolymer mixture as defined in claim 1 wherein said polymeric material is chlorinated polyethylene and polyether urethane elastomers.
Claim 7
Dependent Claim
21 words
The radial block copolymer mixture as defined in claim 1 wherein said polymeric material is chlorinated polyethylene and polyester urethane elastomers.
Claim 8
Dependent Claim
21 words
The radial block copolymer mixture as defined in claim 1 wherein said mixture is molded to form a pharmaceutical sealing component.
Claim 9
Dependent Claim
17 words
The pharmaceutical sealing component as defined in claim 7 in the form of a puncturable reseal device.
Claim 10
Dependent Claim
16 words
The pharmaceutical sealing component as defined in claim 8 in the form of a container closure.
Claim 11
Dependent Claim
18 words
The pharmaceutical sealing component as defined in claim 11 in the form of a syringe plunger sealing ring.
Claim 12
Dependent Claim
20 words
The radial block copolymer as defined in claim 1 wherein said mixture is molded to form a rubber-like syringe bulb.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |