Patent US3721287A successfully refreshed from Google Patents.
US5155147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a pressible mixture of lignocellulose-containing fibers and a thermoplastic material having stronger bonding between the fibers and the thermoplastic material
Assignee: Werzalit AG and Co KG
•
Filing: 1989-12-06
•
Granted: 1992-10-13
•
Expires: 2009-12-06
Abstract
Abstract The method of making a pressible mixture of lignocellulose-containing fibers and a thermoplastic material includes mixing the fibers with 2 to 8% by weight of a duroplastic, preferably an aminoplast or a phenoplast, 0.5 to 2% by weight of a hydrophobic agent for example, paraffin, and 2 to 10% by weight of an aqueous dispersion of methacrylate and/or polyethylene to form a pretreated fiber mixture and then subsequently mixing 100 parts by weight of the pretreated fiber mixture with from 120 to 150 parts by weight of a thermoplastic powder.
Inventors
- 👤 Martin Dietz
- 👤 Bernd Asseier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:56
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08L; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A method of making a pressible mixture of lignocellulose-containing fibers and a thermoplastic material comprising the steps of mixing lignocellulose-containing fibers having less than 2% by weight water with 2 to 8% by weight of a duroplastic, 0.5 to 2% by weight of a hydrophobic agent and 2 to 10% by weight of an aqueous dispersion of a member selected from the group consisting of methacrylates, polyethylene and mixtures thereof to form a pretreated fiber mixture and then subsequently mixing 100 parts of said pretreated fiber mixture with from 120 to 150 parts by weight of a thermoplastic powder to form the pressible mixture.
Claim 2
Independent Claim
104 words
A method of making a pressible mixture of lignocellulose-containing fibers and a thermoplastic material comprising the steps of mixing lignocellulose-containing fibers having less than 2% by weight water with 2 to 8% by weight of a duroplastic, 0.5 to 2% by weight of a hydrophobic agent and 2 to 10% by weight of an aqueous dispersion of a member selected from the group consisting of methacrylates, polyethylene and mixtures thereof to form a pretreated fiber mixture and then subsequently mixing 100 parts of said pretreated fiber mixture with from 120 to 150 parts by weight of a thermoplastic powder to form the pressible mixture.
Claim 3
Dependent Claim
26 words
A method according to claim 1, in which said pretreated fiber mixture contains 3% by weight said duroplastic and 3% by weight of said aqueous dispersion.
Claim 4
Dependent Claim
28 words
A method according to claim 1, further comprising admixing an additional 2 to 10 percent by weight of another aqueous methacrylate dispersion in forming said pretreated fiber mixture.
Claim 5
Dependent Claim
28 words
A method according to claim 1, further comprising admixing an additional 2 to 10 percent by weight of another aqueous polyethylene dispersion in forming said pretreated fiber mixture.
Claim 6
Dependent Claim
19 words
A method according to claim 1, wherein said duroplastic is selected from the group consisting of aminoplasts and phenoplasts.
Claim 7
Dependent Claim
13 words
A method according to claim 1, wherein said hydrophobic agent comprises a paraffin.
Claim 8
Dependent Claim
13 words
A method according to claim 1, wherein said thermoplastic powder comprises polyethylene powder.
Claim 9
Independent Claim
112 words
A method of making a pressible mixture of lignocellulose-containing fibers and a thermoplastic material consisting of the steps of: a. forming a pretreated fiber mixture of lignocellulose-containing fibers having less than 2% by weight water with 2 to 8% by weight of a duroplastic selected from the group consisting of aminoplasts and phenoplasts, 0.5 to 2% by weight paraffin and 2 to 10% by weight of an aqueous dispersion of a member selected from the group consisting of methacrylates, polyethylene and mixtures thereof; and b. then subsequently mixing 100 parts of said pretreated fiber mixture with from 120 to 150 parts by weight of a thermoplastic powder to form the pressible mixture.
Claim 10
Independent Claim
112 words
A method of making a pressible mixture of lignocellulose-containing fibers and a thermoplastic material consisting of the steps of: a. forming a pretreated fiber mixture of lignocellulose-containing fibers having less than 2% by weight water with 2 to 8% by weight of a duroplastic selected from the group consisting of aminoplasts and phenoplasts, 0.5 to 2% by weight paraffin and 2 to 10% by weight of an aqueous dispersion of a member selected from the group consisting of methacrylates, polyethylene and mixtures thereof; and b. then subsequently mixing 100 parts of said pretreated fiber mixture with from 120 to 150 parts by weight of a thermoplastic powder to form the pressible mixture.
Claim 11
Dependent Claim
13 words
A method according to claim 8, wherein said thermoplastic powder comprises polyethylene powder.
References Cited (Backward Citations)
US2601598A
Cited
US3410813A
Cited
US3943079A
Cited
DE2752159A1
Cited
US4414267A
Cited
DE3230888A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |