Patent US4324756A successfully refreshed from Google Patents.
US4324756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for shaping solid polybut-1-ene and the resulting shaped articles
Assignee: Orkem SA
•
Filing: 1979-10-18
•
Granted: 1982-04-13
•
Expires: 1999-10-18
Abstract
Abstract Shaped articles of polybut-1-ene are made by preheating a polymer blank in the crystalline form II at a temperature between 20° and 90° C. The preheated blank is then press-forged under a pressure between 8 and 100 kgf/mm 2 for a period of 1-40 seconds. During the shaping operation, the polymer is converted into the crystalline form I. Polybut-1-ene shaped articles are formed that have a melting peak, determined by differential thermal analysis, at 119° C.
Inventors
- 👤 Andre Kepes
- 👤 Eric Weynant
- 👤 Pierre Avenas
- 👤 Jean-Marc Haudin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:17
CPC Classifications
C; C08; C08J; C08J5/00; B; B29; B29C; B29C43/00; B29C43/003; B29C43/02; B29C43/16; B29C67/00; B29K; B29K2023/00; B29K2023/18; C08J2323/00; C08J2323/02; C08J2323/18; C08J2323/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
47 words
A process for shaping solid polybut-1-ene, comprising preheating polybut-1-ene in the crystalline form II at a temperature between 20° and 90° C. and then press-forging it under a pressure between 8 and 100 kgf/mm 2 for a period of 1 to 40 seconds into a desired shape.
Claim 2
Dependent Claim
47 words
A process for shaping solid polybut-1-ene, comprising preheating polybut-1-ene in the crystalline form II at a temperature between 20° and 90° C. and then press-forging it under a pressure between 8 and 100 kgf/mm 2 for a period of 1 to 40 seconds into a desired shape.
Claim 3
Dependent Claim
24 words
A process according to claim 1, wherein said polybut-1-ene is preheated in the crystalline form II at a temperature between 40° and 80° C.
Claim 4
Dependent Claim
29 words
A process according to claim 1 or claim 2, wherein said polybut-1-ene in the crystalline form II is press-forged under a pressure between 12 and 30 kgf/mm 2 .
Claim 5
Dependent Claim
26 words
A process according to claim 1 or claim 2, wherein said polybut-1-ene in the crystalline form II is press-forged for a period shorter than 12 seconds.
Claim 6
Dependent Claim
25 words
A process according to claim 1 or claim 2, wherein said polybut-1-ene in the crystalline form II is press-forged by means of a cold apparatus.
Claim 7
Dependent Claim
21 words
A process according to claim 1 or claim 2, wherein the compression ratio of said polybut-1-ene is between 65% and 85%.
Claim 8
Dependent Claim
23 words
A process according to claim 3, wherein said polybut-1-ene in the crystalline form II is press-forged for a period shorter than 12 seconds.
Claim 9
Dependent Claim
22 words
A process according to claim 3, wherein said polybut-1-ene in the crystalline form II is press-forged by means of a cold apparatus.
Claim 10
Dependent Claim
22 words
A process according to claim 4, wherein said polybut-1-ene in the crystalline form II is press-forged by means of a cold apparatus.
Claim 11
Dependent Claim
18 words
A process according to claim 3, wherein the compression ratio of said polybut-1-ene is between 65% and 85%.
Claim 12
Dependent Claim
18 words
A process according to claim 4, wherein the compression ratio of said polybut-1-ene is between 65% and 85%.
Claim 13
Dependent Claim
18 words
A process according to claim 5, wherein the compression ratio of said polybut-1-ene is between 65% and 85%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |