US4210573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin containers having improved gas barrier properties
Assignee: PLASTIC PACKAGING PRODUCTS Co A CORP OF DELAWARE
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Filing: 1978-12-07
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Granted: 1980-07-01
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Expires: 1998-12-07
Abstract
Abstract Polyolefin containers having improved gas barrier properties are compression molded from billets formed from polyolefin resins filled with inorganic fillers. The gas barrier properties of the containers are stabilized against loss under conditions of sterilization by treating the fillers with a polar silane compound.
Inventors
- 👤 Stephen W. Cornell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:19
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; C08K9/06; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08K5/00; C08K5/54; C08K2201/00; C08K2201/008
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
In a process for compression molding containers from billets prepared from polyolefin resins having incorporated therein inorganic fillers to impart low oxygen gas permeability thereto the improvement which consists essentially of treating the fillers prior to their incorporation in the polyolefin resin with a polar silane compound having the general formula SiR.sub.1 R.sub.2 R.sub.3 (CH.sub.2).sub.x R.sub.4 wherein R 1 , R 2 and R 3 are alkoxy groups and R 4 is a polar group selected from the group consisting of amino, (aminoethyl) amino, cyano and trifluoro and x is an integer of 1 to 3 whereby the containers when subjected to food sterilization conditions undergo a limited change in gas permeability.
Claim 2
Dependent Claim
112 words
In a process for compression molding containers from billets prepared from polyolefin resins having incorporated therein inorganic fillers to impart low oxygen gas permeability thereto the improvement which consists essentially of treating the fillers prior to their incorporation in the polyolefin resin with a polar silane compound having the general formula SiR.sub.1 R.sub.2 R.sub.3 (CH.sub.2).sub.x R.sub.4 wherein R 1 , R 2 and R 3 are alkoxy groups and R 4 is a polar group selected from the group consisting of amino, (aminoethyl) amino, cyano and trifluoro and x is an integer of 1 to 3 whereby the containers when subjected to food sterilization conditions undergo a limited change in gas permeability.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the polyolefin resin is polyethylene.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the polar silane is γ-aminopropyltriethoxy-silane.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein the filler is mica.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the filler is CaCO 3 .
Claim 7
Dependent Claim
10 words
The process of claim 1 wherein the filler is talc.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein the filler is amorphous silica.
References Cited (Backward Citations)
US4013610A
Cited
US4122147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-01 | 1983-12-31 | 1984-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-01 | 1987-12-31 | 1988-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-01 | 1991-12-31 | 1992-07-01 | $7700.00 | Window Closed / Lapsed |