Patent US4490323A successfully refreshed from Google Patents.
US4490323A
Expired / Lapsed
US
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Incorporation of liquid additives into polymeric films
Assignee: Union Carbide Australia Ltd
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Filing: 1983-03-04
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Granted: 1984-12-25
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Expires: 2003-03-04
Abstract
Abstract Masterbatch concentrates are prepared by the use of a granular resin, permitting higher concentration of liquid additives in the concentrate.
Inventors
- 👤 Bruce J. Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B29K; B29K2023/00; B29K2105/00; B29K2105/0005; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08J2423/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
In a process for the addition of liquid additives in the manufacture of thermoplastic polymeric film wherein solid film resin is advanced to a melt zone to form a melted resin, which is extruded through a die to form the film, the improvement comprising blending a liquid additive with a free flowing granular masterbatch resin which is compatible with the film resin and which has a particle size between about 0.2 millimeters and about 1.5 millimeters, to form a masterbatch concentrate, and mixing the masterbatch concentrate with the solid film resin before advancement to the melt zone.
Claim 2
Dependent Claim
97 words
In a process for the addition of liquid additives in the manufacture of thermoplastic polymeric film wherein solid film resin is advanced to a melt zone to form a melted resin, which is extruded through a die to form the film, the improvement comprising blending a liquid additive with a free flowing granular masterbatch resin which is compatible with the film resin and which has a particle size between about 0.2 millimeters and about 1.5 millimeters, to form a masterbatch concentrate, and mixing the masterbatch concentrate with the solid film resin before advancement to the melt zone.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the granular masterbatch resin is polyethylene made from a low-pressure gas-phase process.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the liquid additive is selected from the group consisting of cling agents, anti-static agents, anti-oxidants, stabilizers, anti-fogging agents, and fragrances.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein the liquid additive is glycerol mono-oleate.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein the concentration of the liquid additive in the masterbatch concentrate is greater than about 5 wt. %, based on the combined weight of the granular resin and the liquid additive.
Claim 7
Dependent Claim
39 words
The process of claim 1 wherein the concentration of the liquid additive in the masterbatch concentrate is between about 10 wt. % and 30 wt. %, based on the combined weight of the granular resin and the liquid additive.
Claim 8
Dependent Claim
50 words
A master batch concentrate comprising a mixture of free flowing granular resin having a particle size between about 0.2 millimeters and about 1.5 millimeters, and a liquid additive in a concentration greater than about 5 wt. %, based on the combined weight of the granular resin and the liquid additive.
Claim 9
Dependent Claim
50 words
A master batch concentrate comprising a mixture of free flowing granular resin having a particle size between about 0.2 millimeters and about 1.5 millimeters, and a liquid additive in a concentration greater than about 5 wt. %, based on the combined weight of the granular resin and the liquid additive.
Claim 10
Dependent Claim
13 words
The masterbatch concentrate of claim 7 wherein the liquid additive is glycerol mono-oleate.
Claim 11
Dependent Claim
18 words
The masterbatch concentrate of claim 7 wherein the granular resin is polyethylene made from a low-pressure, gas-phase process.
Claim 12
Dependent Claim
32 words
The masterbatch concentrate of claim 7 wherein the concentration of the liquid additive is between about 10 wt. % and 30 wt. %, based on the combined weight of the granular resin.
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |