US4950541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maleic anhydride grafts of olefin polymers
Assignee: Dow Chemical Co
•
Filing: 1988-12-22
•
Granted: 1990-08-21
•
Expires: 2008-12-22
Abstract
Abstract Succinic acid or succinic anhydride grafts of linear ethylene polymers are blended with other polymers or resins, e.g. polyesters and the like, to form blends having useful adhesive properties. The adhesive properties are useful in various laminates and in bicomponent fibers which comprise a core of a performance fiber, especially a polyester such as PET or PBT and polyamides, and a sheath of the grafted LDPE, HDPE or LDPE. The succinic acid or succinic anhydride groups are provided by grafting, respectively, maleic acid or maleic anhydride onto the LDPE, LLDPE, and HDPE, especially by a process wherein the grafting is done in a twin-screw, co-rotating extruder with the maleic acid or maleic anhydride being injected into a pressured zone of the extruder. The acid containing grafted polymer is dyeable in contradistinction to ungrafted polymer.
Inventors
- 👤 Ricky L. Tabor
- 👤 Gerald M. Lancaster
- 👤 Zdravko Jezic
- 👤 Gene P. Young
- 👤 John O. Biesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:17
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
35 words
A bicomponent fiber comprising a core of a polyester or polyamide and a sheath of grafted linear ethylene polymer having succinic acid or succinic anhydride groups grafted thereon, said sheath covering or encapsulating said core.
Claim 2
Dependent Claim
35 words
A bicomponent fiber comprising a core of a polyester or polyamide and a sheath of grafted linear ethylene polymer having succinic acid or succinic anhydride groups grafted thereon, said sheath covering or encapsulating said core.
Claim 3
Dependent Claim
11 words
The fiber of claim 1 wherein the core is polyethylene terephthalate.
Claim 4
Dependent Claim
11 words
The fiber of claim 1 wherein the core is polybutylene terephthalate.
Claim 5
Dependent Claim
23 words
The fiber of claim 1 wherein the sheath of grafted linear ethylene polymer comprises at least one of ULDPE, LLDPE, LMDPE, or HDPE.
Claim 6
Dependent Claim
15 words
The fiber of claim 1 wherein the sheath of grafted linear ethylene polymer comprises ULDPE.
Claim 7
Dependent Claim
15 words
The fiber of claim 1 wherein the sheath of grafted linear ethylene polymer comprises LLDPE.
Claim 8
Dependent Claim
14 words
The fiber of claim 1 wherein the sheath of grafted linear ethylene comprises LMDPE.
Claim 9
Dependent Claim
15 words
The fiber of claim 1 wherein the sheath of grafted linear ethylene polymer comprises HDPE.
Claim 10
Dependent Claim
16 words
The fiber of claim 1 wherein the sheath is blend of grafted HDPE and ungrafted LLDPE.
Claim 11
Dependent Claim
23 words
The fiber of claim 1 wherein the sheath is either LLDPEg or HDPEg blended with a polyolefin other than either LLDPE or HDPE.
Claim 12
Dependent Claim
18 words
The fiber of claim 1 wherein the sheath is either LLDPEg or HDPEg blended with LDPE or PP.
Claim 13
Dependent Claim
15 words
The fiber of claim 1 wherein the core is PET or PBT containing fiber-enhancing modifiers.
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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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |