US4539374A
Expired / Lapsed
US
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Polyolefin with improved processing properties
Assignee: EIDP Inc
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Filing: 1984-03-21
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Granted: 1985-09-03
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Expires: 2004-03-21
Abstract
Abstract Processing properties of polyethylene resins are improved while retaining original physical properties by incorporating less than 1.5 weight percent of high molecular weight, non-crystalline polyolefins into the polyolefin resins. The resulting compositions exhibit reduced melt viscosity at high shear rates while providing essentially unchanged finished physical properties of the polyethylene article.
Inventors
- 👤 Jeff T. Fenton
- 👤 Allan J. Lundeen
- 👤 Mark P. Mack
- 👤 Jean A. Merrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:12
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/18; C08L23/20; C08L2207/00; C08L2207/06; C08L2207/062
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A method for improving the processing characteristics of extrudable, substantially crystalline polyolefin polymers and copolymers prepared from monomers containing from 2 to 10 carbon atoms, comprising incorporating into a said polymer or copolymer up to 1.5% by weight of a substantially non-crystalline hydrocarbon soluble homopolymer of a C 8 -C 30 monolefin monomer or copolymer thereof formed with monolefin monomers containing from 2 to 30 carbon atoms, said incorporated homopolymer or copolymer having an inherent viscosity of at least 6.0 deciliters per gram at a shear rate of 300° sec -1 at 25° C.
Claim 2
Independent Claim
94 words
A method for improving the processing characteristics of extrudable, substantially crystalline polyolefin polymers and copolymers prepared from monomers containing from 2 to 10 carbon atoms, comprising incorporating into a said polymer or copolymer up to 1.5% by weight of a substantially non-crystalline hydrocarbon soluble homopolymer of a C 8 -C 30 monolefin monomer or copolymer thereof formed with monolefin monomers containing from 2 to 30 carbon atoms, said incorporated homopolymer or copolymer having an inherent viscosity of at least 6.0 deciliters per gram at a shear rate of 300° sec -1 at 25° C.
Claim 3
Dependent Claim
32 words
A method as described in claim 1 wherein the extrudable polyolefins contained by weight a major portion of polyethylene, polypropylene, poly(butene-1), or mixtures of these prior to incorporation of a non-crystalline polymer.
Claim 4
Dependent Claim
20 words
A method as described in claim 2 wherein the crystalline, extrudable polyolefin contains a major portion by weight of polyethylene.
Claim 5
Dependent Claim
84 words
A method as described in claim 3 wherein the melt index of the substantially crystalline polymer is greater than 1.0 and the ratio of MV 2 to MV 1 is 0.95 to 0.25, wherein MV 1 is the melt viscosity of the crystalline polymer at 190° C. and a shear rate of 2000 sec -1 and MV 2 is the melt viscosity of the composition after incorporation of the non-crystalline polymer measured at 190° C. and a shear rate of 2000 sec -1 .
Claim 6
Dependent Claim
75 words
A method as described in claim 3 wherein the melt index of the substantially crystalline polymer is less than 1.0 and the ratio of MV 2 to MV 1 is from 0.95 to 0.25 wherein MV 1 is the melt viscosity of the crystalline polymer and MV 2 is the melt viscosity of the composition after incorporation of the non-crystalline polymer both measured at 190° C. and a shear rate of 200 sec -1 .
Claim 7
Dependent Claim
69 words
A method as described in claim 4 wherein the ratio ##EQU3## is less than 0.95 wherein MF 1 is the shear rate at onset of melt fracture, MF 2 is a shear rate at the end of the melt fracture ragion, t refers to the blend of crystalline and non-crystalline polymers, and u refers to the substantially crystalline polymer or copolymer prior to the addition of the non-crystalline material.
Claim 8
Dependent Claim
78 words
A resin compositon comprising from 98.5% to 99.9% by weight of an extrudable, substantially crystalline polyolefin homopolymer or copolymer formed from olefins containing from 2 to 30 carbon atoms, together with from about 0.1% to about 1.5% by weight of a substantially non-crystalline homopolymer of a C 8 -C 30 monolefin monomer or copolymer thereof having an inherent viscosity of at least 6.0 deciliters per gram and formed with monolefin monomers containing from 2 to 30 carbon atoms.
Claim 9
Dependent Claim
78 words
A resin compositon comprising from 98.5% to 99.9% by weight of an extrudable, substantially crystalline polyolefin homopolymer or copolymer formed from olefins containing from 2 to 30 carbon atoms, together with from about 0.1% to about 1.5% by weight of a substantially non-crystalline homopolymer of a C 8 -C 30 monolefin monomer or copolymer thereof having an inherent viscosity of at least 6.0 deciliters per gram and formed with monolefin monomers containing from 2 to 30 carbon atoms.
Claim 10
Dependent Claim
40 words
A resin composition as described in claim 7 wherein the crystalline polyolefin polymer is made up of high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, isotactic polypropylene, isotactic polybutene-1, isotactic poly(4-methyl-1-pentene) or mixtures of these.
Claim 11
Dependent Claim
33 words
A composition as described in claim 8 wherein the non-crystalline hydrocarbon soluble polymers contains at least one material selected from the group consisting of poly(octene-1), poly(decene-1), poly(dodecene-1) and copolymers and terpolymers of these.
References Cited (Backward Citations)
US3374290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |