US5236962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline propylene polymers and copolymers in the form of spherical particles at high porosity
Assignee: Himont Inc
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Filing: 1992-08-13
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Granted: 1993-08-17
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Expires: 2012-08-13
Abstract
Abstract Crystalline polymers and copolymers of propylene in the form of spherical particles having a porosity (expressed in percentage of voids) greater than 15%. These polymers are useful in the preparation of masterbatch containing significant quantities of additives and/or pigments.
Inventors
- 👤 Gabriele Govoni
- 👤 Mario Sacchetti
- 👤 Antonio Ciarrocchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:38
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/22; C08F; C08F10/00; C08F10/04; C08F10/06; C08F110/00; C08F110/04; C08F110/06; C08F2/00; C08F210/00; C08F210/04; C08F210/06; C08F210/16; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F8/00; C08F8/34; C08L; C08L23/00; C08L23/02; C08L23/10; C08F2500/00; C08F2500/12; C08F2500/15; C08J; C08J2323/00; C08J2323/02; C08J2323/10; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/06; Y; Y10; Y10S; Y10S526/00; Y10S526/904
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
Crystalline propylene homopolymers with an isotactic index greater than 90 and crystalline copolymers of propylene with ethylene or a CH 2 ═CHR olefin or mixtures thereof containing over 85% by weight of propylene and having an isotactic index greater than 85, where R is an alkyl radical with 2-8 carbon atoms, said homopolymers and copolymers being in the form of spherical particles having an average diameter of from 50 to 5000 microns, a porosity, expressed in void percentage, greater than 15%, and a pore volume distribution such that more than 90% of the pores have a diameter greater than one micron.
Claim 2
Dependent Claim
101 words
Crystalline propylene homopolymers with an isotactic index greater than 90 and crystalline copolymers of propylene with ethylene or a CH 2 ═CHR olefin or mixtures thereof containing over 85% by weight of propylene and having an isotactic index greater than 85, where R is an alkyl radical with 2-8 carbon atoms, said homopolymers and copolymers being in the form of spherical particles having an average diameter of from 50 to 5000 microns, a porosity, expressed in void percentage, greater than 15%, and a pore volume distribution such that more than 90% of the pores have a diameter greater than one micron.
Claim 3
Dependent Claim
16 words
Propylene polymers and copolymers of claim 1 wherein the void percentage is from 20 to 30%.
Claim 4
Dependent Claim
23 words
A masterbatch comprising the homopolymers and copolymers of claim 1 in particulate form having incorporated therein an additive or pigment or mixtures thereof.
Claim 5
Dependent Claim
23 words
A masterbatch comprising the homopolymers and copolymers of claim 2 in particulate form having incorporated therein an additive or pigment or mixtures thereof.
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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) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |