US5135966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Environmentally degradable polymer composition
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1991-11-26
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Granted: 1992-08-04
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Expires: 2011-11-26
Abstract
Abstract Blends of polypropylene, poly(3-hydroxybutyrate) or poly(3-hydroxybutyrate-3-hydroxyvalerate) and metal stearates are both photodegradable and biodegradable.
Inventors
- 👤 Ananda M. Chatterjee
- 👤 Joseph P. Salanitro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:53
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L67/00; C08L67/04; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
An environmentally degradable polymer blend comprising about 30% to about 90% wt of polypropylene, about 10% wt to about 70% wt poly(3-hydroxybutrate) or poly(3-hydroxybutrate-3-hydroxyvalerate) and from about 0.05% wt to about 5% wt of a transition metal stearate selected from the group consisting of ferric tristearate and cerium tristearate, wherein poly(3-hydroxybutrate-3-hydroxyvalerate) has a hydroxyvalerate comonomer content of up to about 30% wt.
Claim 2
Dependent Claim
62 words
An environmentally degradable polymer blend comprising about 30% to about 90% wt of polypropylene, about 10% wt to about 70% wt poly(3-hydroxybutrate) or poly(3-hydroxybutrate-3-hydroxyvalerate) and from about 0.05% wt to about 5% wt of a transition metal stearate selected from the group consisting of ferric tristearate and cerium tristearate, wherein poly(3-hydroxybutrate-3-hydroxyvalerate) has a hydroxyvalerate comonomer content of up to about 30% wt.
Claim 3
Dependent Claim
25 words
The blend of claim 1 comprising about 35% wt to about 80% wt polypropylene and about 20% wt to about 65% wt poly(3-hydroxybutrate) or poly(3-hydroxybutrate-3-hydroxyvalerate).
Claim 4
Dependent Claim
25 words
The blend of claim 1 comprising about 40% wt to about 65% wt polypropylene and about 35% wt to about 60% wt poly(3-hydroxybutrate) or poly(3-hydroxybutrate-3-hydroxyvalerate).
Claim 5
Dependent Claim
20 words
The blend of claim 1 wherein the transition metal stearate is present at between 0.1% wt and about 3% wt.
Claim 6
Dependent Claim
20 words
The blend of claim 1 wherein the transition metal stearate is present at between 0.2% wt and about 2% wt.
Claim 7
Dependent Claim
17 words
The blend of claim 1 wherein the hydroxyvalerate content is between about 10% wt and 30% wt.
Claim 8
Dependent Claim
17 words
The blend of claim 1 wherein the hydroxyvalerate content is between about 15% wt and 25% wt.
Claim 9
Dependent Claim
24 words
The blend of claim 1 wherein the polypropylene is a copolymer of polypropylene and up to about 15% wt of an alpha olefin comonomer.
Claim 10
Dependent Claim
10 words
The blend of claim 6 wherein the comonomer is ethylene.
Claim 11
Dependent Claim
10 words
A degradable article produced from the blend of claim 1.
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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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |