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US4178328A
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US
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Rigid, high impact polypropylene compositions
Assignee: GE Chemicals Inc
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Filing: 1977-12-14
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Granted: 1979-12-11
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Expires: 1997-12-14
Abstract
Abstract Polypropylene compositions comprising a polypropylene polymer and a hydrogenated block polymer impact modifier exhibit enhanced impact properties and retain rigidity when blended with a crystalline polyethylene.
Inventors
- 👤 Krishnan Thiruvillakkat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:59
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L2205/00; C08L2205/03; C08L23/04; C08L23/06; C08L53/00; C08L53/02; C08L53/025
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A polymeric blend composition comprising from 80 to 60 wt. percent of a polypropylene polymer, from 10 to 20 wt. percent of a hydrogenated block copolymer having the general configuration A-B-A wherein prior to hydrogenation the A's are polymeric blocks of vinylaromatic monomer units and B is an elastomeric polymer block of a conjugated diene monomer, said copolymer being hydrogenated to remove the ethylenic unsaturation, and from 10 to 20 wt. percent polyethylene.
Claim 2
Dependent Claim
73 words
A polymeric blend composition comprising from 80 to 60 wt. percent of a polypropylene polymer, from 10 to 20 wt. percent of a hydrogenated block copolymer having the general configuration A-B-A wherein prior to hydrogenation the A's are polymeric blocks of vinylaromatic monomer units and B is an elastomeric polymer block of a conjugated diene monomer, said copolymer being hydrogenated to remove the ethylenic unsaturation, and from 10 to 20 wt. percent polyethylene.
Claim 3
Dependent Claim
35 words
The composition of claim 1 wherein the polypropylene polymer is a substantially crystalline polymer having a melt flow of from about 0.1 to 10 g./10 min. as measured by ASTM test method D-1238, condition L.
Claim 4
Dependent Claim
41 words
The composition of claim 1 wherein the polyethylene is substantially crystalline, having a melt flow of from about 0.01 to 10 g./10 min. as measured by ASTM test method D-1238, condition L, and a density greater than 0.91 g./cm 3 .
Claim 5
Independent Claim
60 words
A method for improving the impact properties of polymeric blends comprising 80 to 60 wt. percent; polypropylene polymers and 10 to 20 wt. percent hydrogenated block copolymers having the general configuration A-B-A wherein the ethylenic unsaturation is removed by hydrogenation, comprising blending therewith from about 10 to about 20 percent by weight based on final composition of a crystalline polyethylene.
Claim 6
Independent Claim
60 words
A method for improving the impact properties of polymeric blends comprising 80 to 60 wt. percent; polypropylene polymers and 10 to 20 wt. percent hydrogenated block copolymers having the general configuration A-B-A wherein the ethylenic unsaturation is removed by hydrogenation, comprising blending therewith from about 10 to about 20 percent by weight based on final composition of a crystalline polyethylene.
References Cited (Backward Citations)
US3299174A
Cited
US3576913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |