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Patent US4380522A successfully refreshed from Google Patents.
US4380522A
Expired / Lapsed
US
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Process for the manufacture of articles from composition comprising modified polyolefines and cellulosic fibres
Assignee: Solvay SA
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Filing: 1981-04-13
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Granted: 1983-04-19
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Expires: 2001-04-13
Abstract
Abstract A process for the manufacture of shaped articles from compositions containing 30 to 70% by weight of polyolefine which is a high density polyethylene modified with polar monomers and 30 to 70% by weight of cellulosic fibres. These compositions are malaxated at a temperature at least 20° C. above the melting point of the polyolefine. The process is applicable to the manufacture of panels which can be used in the automobile industry.
Inventors
- 👤 Pierre Georlette
- 👤 Rene Bouteille
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:37
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/06; B; B27; B27N; B27N3/00; B27N3/002; B27N3/04; C08L23/00; C08L23/02; C08L23/025; C08L23/04; C08L23/06; C08L51/006; C08L97/00; C08L97/02; C08K; C08K5/00; C08K5/04; C08K5/14; C08L2205/00; C08L2205/14; C08L2205/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
Process for manufacture of a shaped article from a polyolefine composition comprising between 30 and 70% by weight of a polyolefine which is a high density polyethylene modified by means of a polar monomer and between 30 and 70% by weight of cellulosic fibres, comprising: subjecting the polyolefine composition to a malaxating operation carried out at a temperature which is at least 40° C. above the melting point of the polyolefine, before the composition is moulded.
Claim 2
Dependent Claim
76 words
Process for manufacture of a shaped article from a polyolefine composition comprising between 30 and 70% by weight of a polyolefine which is a high density polyethylene modified by means of a polar monomer and between 30 and 70% by weight of cellulosic fibres, comprising: subjecting the polyolefine composition to a malaxating operation carried out at a temperature which is at least 40° C. above the melting point of the polyolefine, before the composition is moulded.
Claim 3
Dependent Claim
25 words
Process according to claim 1 wherein the polyolefine is a modified high density polyethylene having a melt index of between 0.5 and 10 g/10 min.
Claim 4
Dependent Claim
19 words
Process according to claim 1 or 2, wherein the polyolefine is a polyolefine modified by means of maleic anhydride.
Claim 5
Dependent Claim
21 words
Process according to claim 1 or 2, wherein the polyolefine is a polyolefine modified by grafting by means of polar monomers.
Claim 6
Dependent Claim
24 words
Process according to claim 4, wherein the polyolefine composition is prepared by directly mixing the unmodified polyolefine, the polar monomer and the cellulosic fibres.
Claim 7
Dependent Claim
16 words
Process according to claim 1 or 2, wherein the polyolefine composition is moulded directly after malaxating.
Claim 8
Dependent Claim
15 words
Process according to claim 6, wherein the polyolefine composition is moulded into panels by calendering.
References Cited (Backward Citations)
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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) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |