Patent US4423181A successfully refreshed from Google Patents.
US4423181A
Expired / Lapsed
US
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Polyethylene-polybutadiene blend
Assignee: Polysar Ltd
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Filing: 1982-06-14
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Granted: 1983-12-27
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Expires: 2002-06-14
Abstract
Abstract Compositions having improved low temperature impact strength are provided which comprise a mixture of high density polyethylene and polybutadiene. Such compositions may be used for coating of pipes, especially for Arctic-type use conditions or for containers for low temperature use.
Inventors
- 👤 Eric G. Kent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:20
CPC Classifications
C; C09; C09D; C09D123/00; C09D123/02; C09D123/04; C09D123/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
A process for the production of a thermoplastic composition having improved low temperature impact properties comprising, per 100 parts by weight of polymer components, from about 80 to about 95 parts by weight of polyethylene having a density of from about 0.95 to about 0.965 g/cm 3 and from about 5 to about 20 parts by weight of an unhydrogenated polybutadiene having from about 85 to about 98 percent of 1,4-content and having from about 95 to 100 percent of the theoretical unsaturation, in which process the polyethylene is supplied to a two roll mill or an internal mixer preheated to a temperature of about 120° to 155° C. and fluxed for 2 to 3 minutes, the polybutadiene is added and the mixing continued for about 5 to 7 minutes to produce a uniform mixture, after which the mixture is removed and cooled.
Claim 2
Dependent Claim
143 words
A process for the production of a thermoplastic composition having improved low temperature impact properties comprising, per 100 parts by weight of polymer components, from about 80 to about 95 parts by weight of polyethylene having a density of from about 0.95 to about 0.965 g/cm 3 and from about 5 to about 20 parts by weight of an unhydrogenated polybutadiene having from about 85 to about 98 percent of 1,4-content and having from about 95 to 100 percent of the theoretical unsaturation, in which process the polyethylene is supplied to a two roll mill or an internal mixer preheated to a temperature of about 120° to 155° C. and fluxed for 2 to 3 minutes, the polybutadiene is added and the mixing continued for about 5 to 7 minutes to produce a uniform mixture, after which the mixture is removed and cooled.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the polybutadiene has a 1,2-content of from about 10 to about 15 percent and a 1,4-content of from about 85 to about 90 percent.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein the polybutadiene has a 1,2-content of from about 2 to about 5 percent and a 1,4-content of from about 95 to about 98 percent.
Claim 5
Dependent Claim
32 words
The process of claim 1 wherein up to 30 parts by weight of a filler selected from talc, mica, calcium carbonate, alumina and wollastonite is added after the polyethylene has been fluxed.
Claim 6
Dependent Claim
32 words
The process of claim 1 wherein the composition comprises from about 7.5 to about 15 parts by weight of polybutadiene and from about 85 to about 92.5 parts by weight of polyethylene.
Claim 7
Dependent Claim
35 words
The process of claim 1 wherein up to 30 parts by weight of a filler selected from talc, mica, calcium carbonate, alumina and wollastonite is added after the polybutadiene has been mixed into the polyethylene.
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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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |