US5264493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the treatment of polypropylene
Assignee: TotalEnergies Onetech Belgium SA
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Filing: 1993-03-04
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Granted: 1993-11-23
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Expires: 2013-03-04
Abstract
Abstract Isotactic polypropylene and/or ethylene-propylene copolymers are blended with 5-65 wt % of atactic polypropylene and up to 20 wt % of the total blend of a thermosensitive agent. The process is particularly adapted for the incorporation of prodegradents used for reducing the molecular weight and its distribution, thereby producing polyethylene particularly suitable for fiber or film formation.
Inventors
- 👤 Claude Palate
- 👤 Alain M. F. Prevot
- 👤 Rene Venneman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:56
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; B; B29; B29C; B29C48/00; B29C48/25; B29C48/92; C08F; C08F8/00; C08F8/50; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92704; B29C48/022; B29C48/36; B29C48/395; C08F2810/00; C08F2810/10; C08L2205/00; C08L2205/02; C08L2207/00; C08L2207/10; C08L2207/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
106 words
A process for incorporating an organic peroxide prodegradent into an isotactic polypropylene homopolymer such that said prodegradent agent is substantially incorporated into the isotactic polypropylene homopolymer intact, said process comprising the steps of: (i) preparing an initial homogeneous blend consisting of isotactic polypropylene homopolymer and 5 to 65% of atactic polypropylene; (ii) introducing into a mixing means the blend of step (i) simultaneously with an organic peroxide prodegradent agent to form a second homogeneous bend; (iii) extruding the blend of step (ii), and (iv) forming the extruded blend of step (iii)into polypropylene pellets that include a substantial portion of the prodegradent agent blended in step (ii).
Claim 2
Dependent Claim
106 words
A process for incorporating an organic peroxide prodegradent into an isotactic polypropylene homopolymer such that said prodegradent agent is substantially incorporated into the isotactic polypropylene homopolymer intact, said process comprising the steps of: (i) preparing an initial homogeneous blend consisting of isotactic polypropylene homopolymer and 5 to 65% of atactic polypropylene; (ii) introducing into a mixing means the blend of step (i) simultaneously with an organic peroxide prodegradent agent to form a second homogeneous bend; (iii) extruding the blend of step (ii), and (iv) forming the extruded blend of step (iii)into polypropylene pellets that include a substantial portion of the prodegradent agent blended in step (ii).
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein the initial homogeneous blend comprises from about 5 to about 50% atactic polypropylene.
Claim 4
Dependent Claim
35 words
The process of claim 1, wherein said prodegradent agent is present in an amount in the range of about 0.01 to about 20% by weight based on the total weight of said initial homogeneous blend.
Claim 5
Dependent Claim
50 words
The process of claim 3, comprising simultaneously introducing into an extruder the initial homogeneous blend of isotactic polypropylene homopolymer and atactic polypropylene with a prodegradent agent in an amount in the range of about 10 to about 20% by weight based on the total weight of said initial homogeneous blend.
Claim 6
Dependent Claim
25 words
The process of claim 3, wherein said prodegradent agent has a half-life in the range of about 1 to about 5 minutes at 170° C.
Claim 7
Dependent Claim
41 words
The process of claim 3, wherein the extrusion of the polymers and the prodegradent agent is conducted at a temperature in the range of about 130 to about 165 C for a residence time in the extruder of about 90 seconds.
Claim 8
Dependent Claim
23 words
The process of claim 3, wherein the prodegradent agent is selected from the group consisting of: 2,5-dimethyl-2,5-bis(t-butylperoxy)-hexyne-3; 4-methyl-4-t-butylperoxy-2-pentanone; 3,6,6,9,9-pentamethyl-3-(ethyl acetate)-1,2,4,5-textraoxycyclononane; 2,5-dimethyl-2,5-bis-(t-butylperoxy)-hexane; and 1-3-bis-(tert-butylperoxyisopropyl)-benzene.
Claim 9
Dependent Claim
20 words
The process of claim 3, wherein the prodegradent agent is selected from the group consisting of: 2,5-dimethyl-2,5-bis-(tert-butylperoxy)-hexyne-3 and 3,6,6,9,9-pentamethyl-3-(ethyl acetate)-1,2,4,5-tetraoxy-cyclononane.
Claim 10
Dependent Claim
50 words
The process of claim 2, comprising simultaneously introducing into an extruder the initial homogeneous blend of isotactic polypropylene homopolymer and atactic polypropylene with said prodegradent agent in an amount in the range of about 10 to about 20% by weight based on the total weight of said initial homogeneous blend.
Claim 11
Dependent Claim
25 words
The process of claim 9, wherein the prodegradent agent has a half-life in the range of about 1 to about 5 minutes at 170 C.
Claim 12
Dependent Claim
41 words
The process of claim 9 wherein the extrusion of the polymers and the prodegradent agent is conducted at a temperature in the range of about 130 to about 165° C. for a residence time in the extruder of about 90 seconds.
Claim 13
Dependent Claim
23 words
The process of claim 9, wherein the prodegradent agent is selected from the group consisting of: 2,5-dimethyl-2,5-bis(t-butylperoxy)-hexyne-3; 4-methyl-4-t-butylperoxy-2-pentanone; 3,6,6,9,9-pentamethyl-3-(ethyl acetate)-1,2,4,5-textraoxycyclononane; 2,5-dimethyl-2,5-bis-(t-butylperoxy)-hexane; and 1-3-bis-(tert-butylperoxyisopropyl)-benzene.
Claim 14
Dependent Claim
20 words
The process of claim 9, wherein the prodegradent agent is selected from the group consisting of: 2,5-dimethyl-2,5-bix-(tert-butylperoxy)-hexyne-3 and 3,6,6,9,9-pentamehyl-3-(ethyl acetate)-1,2,4,5-tetraoxy-cyclononane.
Claim 15
Dependent Claim
58 words
The process of claim 1 wherein the formed pellets contain said prodegradent agent in an amount greater than 10% by weight based on the total weight of said initial homogeneous blend, and said pellets are subsequently extruded under conditions causing the prodegradent therein to substantially completely react, thereby producing a polypropylene particularly suitable for fiber or fiber formation.
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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) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |