Patent US4411262B1 successfully refreshed from Google Patents.
US4603151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spherical polyvinyl chloride particles
Assignee: Oxy Vinyls LP
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Filing: 1985-03-04
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Granted: 1986-07-29
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Expires: 2005-03-04
Abstract
Abstract Polyvinyl chloride resin in particulate form characterized by said resin particles being spherical in shape and said resin having low amounts of glassy content. Extrudates, such as pipe, formed from the novel resin of this invention have high impact strength. The novel resin of this invention has high bulk density and fast extrusion rates.
Inventors
- 👤 Kornelius Dinbergs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:03
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/18; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08F14/00; C08F14/02; C08F14/04; C08F14/06; Y; Y10; Y10S; Y10S521/00; Y10S521/921
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
82 words
A polyvinyl chloride resin in particulate form characterized by: (a) said resin particles having an average particle size by weight greater than about 70 microns; (b) at least about 25 percent by weight of said particles are spherical in shape as evidenced by a Roundometer instrument; (c) said resin having less than about 20 percent by weight of glassy content as measured by ethanol sorption/desorption method (d) said resin has a mercury porosity of from about 0.05 cc/g to about 0.5 cc/g.
Claim 2
Dependent Claim
82 words
A polyvinyl chloride resin in particulate form characterized by: (a) said resin particles having an average particle size by weight greater than about 70 microns; (b) at least about 25 percent by weight of said particles are spherical in shape as evidenced by a Roundometer instrument; (c) said resin having less than about 20 percent by weight of glassy content as measured by ethanol sorption/desorption method (d) said resin has a mercury porosity of from about 0.05 cc/g to about 0.5 cc/g.
Claim 3
Dependent Claim
25 words
A resin of claim 1 wherein at least 50 percent by weight of said particles are spherical in shape as evidenced by a Roundometer instrument.
Claim 4
Dependent Claim
25 words
A resin of claim 2 wherein at least 80 percent by weight of said particles are spherical in shape as evidenced by a Roundometer instrument.
Claim 5
Dependent Claim
25 words
A resin of claim 1 wherein said resin has less than about 10 percent by weight of glassy content as measured by ethanol sorption/desorption method.
Claim 6
Dependent Claim
25 words
A resin of claim 1 wherein said resin has less than about 5 percent by weight of glassy content as measured by ethanol sorption/desorption method.
Claim 7
Dependent Claim
20 words
A resin of claim 1 wherein said resin has a mercury porosity of from about 0.1 to about 0.25 cc/g.
Claim 8
Dependent Claim
17 words
A resin of claim 1 wherein said resin has a bulk density greater than about 0.58 g/cc.
Claim 9
Dependent Claim
16 words
A resin of claim 6 wherein said resin has a bulk density greater than 0.62 g/cc.
Claim 10
Dependent Claim
21 words
A resin of claim 1 wherein the average particle size by weight is from about 70 microns to about 1000 microns.
Claim 11
Dependent Claim
20 words
A resin of claim 10 wherein the average particle size by weight is from about 100 to about 400 microns.
Claim 12
Dependent Claim
75 words
A spherical polyvinyl chloride resin in particulate form characterized by said resin particles having an average shape factor greater than about 0.9 and said resin has less than about 20 percent by weight of glassy content as measured by ethanol sorption/desorption method and wherein said resin has an average particle size by weight greater than about 70 microns and wherein said resin has a mercury porosity of from about 0.05 cc/g to about 0.5 cc/g.
Claim 13
Dependent Claim
75 words
A spherical polyvinyl chloride resin in particulate form characterized by said resin particles having an average shape factor greater than about 0.9 and said resin has less than about 20 percent by weight of glassy content as measured by ethanol sorption/desorption method and wherein said resin has an average particle size by weight greater than about 70 microns and wherein said resin has a mercury porosity of from about 0.05 cc/g to about 0.5 cc/g.
Claim 14
Dependent Claim
18 words
A resin of claim 11 wherein the average shape factor of said particle is greater than about 0.93.
Claim 15
Dependent Claim
18 words
A resin of claim 12 wherein the average shape factor of said particles is greater than about 0.95.
Claim 16
Dependent Claim
25 words
A resin of claim 13 wherein said resin has less than about 10 percent by weight of glassy content as measured by ethanol sorption/desorption method.
Claim 17
Dependent Claim
17 words
A resin of claim 14 wherein said resin has a bulk density greater than about 0.58 g/cc.
Claim 18
Dependent Claim
17 words
A resin of claim 15 wherein said resin has a bulk density greater than about 0.62 g/cc.
Claim 19
Dependent Claim
123 words
A polyvinyl chloride homopolymer resin in particulate form characterized by said resin particles having: (a) spherical shape as evidenced by said particles greater than 105 microns in diameter having an average shape factor greater than about 0.95; or (b) at least 80 percent by weight of said particles greater than 105 microns in diameter are spherical in shape as evidenced by a Roundometer instrument; (c) the glassy content of said resin is less than about 5 percent by weight as measured by ethanol sorption/desorption method; (d) a bulk density greater than about 0.62 g/cc; (e) a mercury porosity from about 0.1 cc/g to about 0.25 cc/g; and (f) an average particle size by weight of from about 100 microns to about 400 microns.
Claim 20
Dependent Claim
123 words
A polyvinyl chloride homopolymer resin in particulate form characterized by said resin particles having: (a) spherical shape as evidenced by said particles greater than 105 microns in diameter having an average shape factor greater than about 0.95; or (b) at least 80 percent by weight of said particles greater than 105 microns in diameter are spherical in shape as evidenced by a Roundometer instrument; (c) the glassy content of said resin is less than about 5 percent by weight as measured by ethanol sorption/desorption method; (d) a bulk density greater than about 0.62 g/cc; (e) a mercury porosity from about 0.1 cc/g to about 0.25 cc/g; and (f) an average particle size by weight of from about 100 microns to about 400 microns.
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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |