US4335225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric polypropylene
Assignee: EIDP Inc
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Filing: 1981-03-03
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Granted: 1982-06-15
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Expires: 2001-03-03
Abstract
Abstract A fractionable elastic polypropylene which has an inherent viscosity of 1.5-9, exhibits no yield point, has a tensile set not exceeding 150% and contains about 10 to 80% by weight of a diethyl ether-soluble fraction having an inherent viscosity exceeding 1.50. This polypropylene is a direct reaction product and thus need not be separated into its component parts to be a useful elastomer. Also described is the diethyl ether-soluble polypropylene fraction of the direct reaction product which has about 0.5% to about 5% isotactic crystallinity and exhibits birefringence when a film formed from said fraction is viewed under crossed Nicol prisms in a polarizing microscope at about 25° C. or is stretched between crossed polarizing sheets at about 25° C. The diethyl ether-soluble fraction itself is a useful elastomeric material.
Inventors
- 👤 John W. Collette
- 👤 Charles W. Tullock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:28
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; C08F10/00; C08F10/04; C08F10/06; Y; Y10; Y10S; Y10S526/00; Y10S526/905
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
99 words
As a new product, a fractionable elastic polymer consisting essentially of units derived from propylene which has an inherent viscosity of 1.5-9, a major melting point between about 135°-155° C., exhibits no yield point, has a tensile set not exceeding 150% and contains 10-80% by weight of a diethyl ether-soluble fraction which has an inherent viscosity exceeding 1.50, said diethyl ether-soluble fraction having an isotactic crystalline content of about 0.5% to about 5% by weight and exhibiting birefringence when a film formed from said fraction is viewed under crossed Nicol prisms in a polarizing microscope at about 25° C.
Claim 2
Dependent Claim
99 words
As a new product, a fractionable elastic polymer consisting essentially of units derived from propylene which has an inherent viscosity of 1.5-9, a major melting point between about 135°-155° C., exhibits no yield point, has a tensile set not exceeding 150% and contains 10-80% by weight of a diethyl ether-soluble fraction which has an inherent viscosity exceeding 1.50, said diethyl ether-soluble fraction having an isotactic crystalline content of about 0.5% to about 5% by weight and exhibiting birefringence when a film formed from said fraction is viewed under crossed Nicol prisms in a polarizing microscope at about 25° C.
Claim 3
Dependent Claim
128 words
As a new product, a fractionable elastic polymer consisting essentially of units derived from propylene which has an inherent viscosity of 1.5-9, a major melting point between about 135°-155° C., exhibits no yield point, has a tensile set not exceeding 150% and contains from about 10-35% by weight of a fraction soluble in boiling hexane but insoluble in boiling diethyl ether, from about 10-55% of a fraction insoluble in boiling hexane and 40-75% by weight of a diethyl ether-soluble fraction which has an inherent viscosity exceeding 1.50, said diethyl ether-soluble fraction having an isotactic crystalline content of about 0.5% to about 5% by weight and exhibiting birefringence when a film formed from said fraction is viewed under crossed Nicol prisms in a polarizing microscope at about 25° C.
Claim 4
Dependent Claim
128 words
As a new product, a fractionable elastic polymer consisting essentially of units derived from propylene which has an inherent viscosity of 1.5-9, a major melting point between about 135°-155° C., exhibits no yield point, has a tensile set not exceeding 150% and contains from about 10-35% by weight of a fraction soluble in boiling hexane but insoluble in boiling diethyl ether, from about 10-55% of a fraction insoluble in boiling hexane and 40-75% by weight of a diethyl ether-soluble fraction which has an inherent viscosity exceeding 1.50, said diethyl ether-soluble fraction having an isotactic crystalline content of about 0.5% to about 5% by weight and exhibiting birefringence when a film formed from said fraction is viewed under crossed Nicol prisms in a polarizing microscope at about 25° C.
Claim 5
Dependent Claim
16 words
A polymer of claim 1 or claim 2 which has a tensile set not exceeding 100%.
Claim 6
Dependent Claim
15 words
A polymer of claim 1 or claim 2 which has an inherent viscosity of 2-8.
Claim 7
Dependent Claim
15 words
A polymer of claim 1 which contains about 40-75% by weight of said ether-soluble fraction.
Claim 8
Dependent Claim
36 words
A polypropylene of claim 1 which has an inherent viscosity of 3-8, a tensile set not exceeding 100% and contains about 40-75% by eight of a diethyl ether-soluble fraction having a inherent viscosity greater than 2.5.
Claim 9
Dependent Claim
29 words
A polymer consisting essentially of a blend of about 5-95 parts by weight of the polymer of claim 1 and about 95-5 parts by weight of highly isotactic polypropylene.
Claim 10
Dependent Claim
29 words
A polymer consisting essentially of a blend of about 60-95 parts by weight of the polymer of claim 1 and about 5-40 parts by weight of highly isotactic polypropylene.
Claim 11
Dependent Claim
11 words
A polymer of claim 1 in the form of a film.
Claim 12
Dependent Claim
11 words
A polymer film of claim 9 wherein the film is oriented.
Claim 13
Dependent Claim
11 words
A polymer of claim 8 in the form of a film.
Claim 14
Dependent Claim
11 words
A polymer film of claim 11 wherein the film is oriented.
Claim 15
Dependent Claim
12 words
A polymer of claim 1 in the form of an extruded tubing.
Claim 16
Dependent Claim
12 words
A polymer of claim 8 in the form of an extruded tubing.
Claim 17
Dependent Claim
19 words
A polymer of claim 1 which contains up to 10 mole % of polymerized α-monoolefin units other than propylene.
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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) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |