US4559376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing plastic composites filled with cellulose or lignocellulosic materials
Assignee: Individual
•
Filing: 1982-12-10
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Granted: 1985-12-17
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Expires: 2002-12-10
Abstract
Abstract A method to produce composites based on cellulose or lignocellulosic materials and plastics according to which method the cellulose or lignocellulose material is subjected to a pre-hydrolytic or other chemically degrading treatment prior to or during the compounding or processing step whereby a comminution and improved dispersion of the cellulose or lignocellulose material in the plastic phase is achieved.
Inventors
- 👤 Josef Kubat
- 👤 Tore C. F. Klason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:14
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; C08L1/00; C08L1/02; C08L101/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
A method of producing plastics composites containing cellulose or lignocellulose material in a plastics matrix, said method comprising the successive steps of: (1) subjecting the cellulose or lignocellulose material to pre-hydrolytic chemical degradation, and thereafter (2) incorporating the thus degraded cellulosic or lignocellulosic material into the plastics matrix thereby facilitating comminution and improved dispersion of the cellulosic or lignocellulosic materials in the plastic phase.
Claim 2
Independent Claim
64 words
A method of producing plastics composites containing cellulose or lignocellulose material in a plastics matrix, said method comprising the successive steps of: (1) subjecting the cellulose or lignocellulose material to pre-hydrolytic chemical degradation, and thereafter (2) incorporating the thus degraded cellulosic or lignocellulosic material into the plastics matrix thereby facilitating comminution and improved dispersion of the cellulosic or lignocellulosic materials in the plastic phase.
Claim 3
Dependent Claim
22 words
The method of claim 1 in which the plastics composite contains up to 40% by weight of the cellulose or lignocellulose material.
Claim 4
Dependent Claim
26 words
The method of claim 1 in which a masterbatch concentrate for plastics containing up to 70% by weight of the cellulose or lignocellulose material is prepared.
Claim 5
Independent Claim
73 words
A method of producing a thermoplastic composite in which cellulose of lignocellulose materials are dispersed, said method comprising the successive steps of: (1) subjecting a cellulose or lignocellulose material to a pre-hydrolytic treatment to produce an embrittled easily disintegratable, self-comminuting material, and thereafter (2) incorporating the thus-treated material into the thermoplastic and subjecting the resulting mixture to shear forces thereby comminuting the treated cellulosic or lignocellulosic material and distributing same throughout the thermoplastic.
Claim 6
Independent Claim
73 words
A method of producing a thermoplastic composite in which cellulose of lignocellulose materials are dispersed, said method comprising the successive steps of: (1) subjecting a cellulose or lignocellulose material to a pre-hydrolytic treatment to produce an embrittled easily disintegratable, self-comminuting material, and thereafter (2) incorporating the thus-treated material into the thermoplastic and subjecting the resulting mixture to shear forces thereby comminuting the treated cellulosic or lignocellulosic material and distributing same throughout the thermoplastic.
Claim 7
Dependent Claim
27 words
The method of claim 4 in which the cellulose or lignocellulose material is not subjected to grinding or comminution prior to the pre-hydrolytic treatment of step (1).
Claim 8
Dependent Claim
24 words
The method of claim 5 in which the thermoplastic composite contains up to 40% by weight of the pre-hydrolytic cellulose or lignocellulose incorporated therein.
Claim 9
Dependent Claim
27 words
The method of claim 5 in which a masterbatch concentrate is produced which contains up to 70% by weight of the pre-hydrolytic cellulose or lignocellulose incorporated therein.
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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |