US4359544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synergistic co-nucleants for butene-1 polymer compositions
Assignee: Shell USA Inc
•
Filing: 1982-02-01
•
Granted: 1982-11-16
•
Expires: 2002-02-01
Abstract
Abstract The crystallization from the melt of an isotactic butene-1 homopolymer composition, isotactic butene-1-ethylene copolymer or isotactic butene-1-propylene copolymer composition is promoted by adding a small amount of stearamide and high density polyethylene as nucleating agents. The two nucleating agents cooperate in a synergistic fashion, resulting in much faster processing rates.
Inventors
- 👤 Charles C. Hwo
- 👤 John A. Martone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:16
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/20; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/18; C08L23/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
A method for promoting crystallization from the melt of an isotactic butene-1 homopolymer, isotactic butene-1-propylene copolymer or isotactic butene-1-ethylene copolymer having no more than about 15 mole percent by ethylene, which comprises adding to a composition comprising the homopolymer or copolymer about 0.02 to 5.0% by weight stearamide and about 0.02 to 5.0% by weight high density polyethylene.
Claim 2
Independent Claim
58 words
A method for promoting crystallization from the melt of an isotactic butene-1 homopolymer, isotactic butene-1-propylene copolymer or isotactic butene-1-ethylene copolymer having no more than about 15 mole percent by ethylene, which comprises adding to a composition comprising the homopolymer or copolymer about 0.02 to 5.0% by weight stearamide and about 0.02 to 5.0% by weight high density polyethylene.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said composition comprises a butene-1-ethylene copolymer, stearamide and high density polyethylene.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said composition also contains isotactic polypropylene and a slip antiblock additive package.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein said composition comprises about 0.35 to about 0.65% by weight stearamide and about 0.5 to about 1.1% by weight high density polyethylene.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein said high density polyethylene has a density above about 0.93 grams per cubic centimeter.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein said composition comprises a butene-1-propylene copolymer, steramide and high density polyethylene.
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) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |