Patent US4426469A successfully refreshed from Google Patents.
US4426469A
Expired / Lapsed
US
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Glass fibers for the reinforcement of polyolefins and reinforced polyolefin compositions obtained therefrom
Assignee: Montedison SpA
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Filing: 1982-05-24
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Granted: 1984-01-17
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Expires: 2002-05-24
Abstract
Abstract Glass fibers for the production of reinforced polymers, characterized in that said fibers have a coating comprising, besides a film forming agent of polyolefinic kind and a silane, also a bis-maleamic acid such as N,N'-hexamethylene-bis-maleamic acid, N,N'-dodecamethylene-bis-maleamic acid or N,N'-isophoron-bis-maleamic acid. The invention also concerns blends consisting of 50-90% by weight of a crystalline polyolefin, e.g. polypropylene and 50-10% by weight of said coated glass fibers.
Inventors
- 👤 Roberto Marzola
- 👤 Enea Garagnani
- 👤 Alessandro Moro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:41
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08J5/08; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
Glass fibers for the production of reinforced polymers, characterized in that said fibers have a coating comprising, besides a polyolefinic film-forming agent and a silane, also a bis-maleamic acid of general formula: ##STR3## wherein X is a group (CHR) n in which n is an integer from 2 to 18 and R is hydrogen or an alkyl with 1-6 carbon atoms, or X is a bivalent cycloaliphatic or aromatic group also having several nuclei, or a heterocyclic group; R' is hydrogen, the two R's together being also capable of forming a group (CHR) n when X is (CHR) n ; said coating being obtained by passing the fibers, after their leaving the spinneret, through an aqueous finishing bath containing, by weight, from 0.5 to 10% of polyolefinic film-forming agent, from 0.01 to 3% of silane and from 0.01 to 3% of bis-maleamic acid.
Claim 2
Dependent Claim
143 words
Glass fibers for the production of reinforced polymers, characterized in that said fibers have a coating comprising, besides a polyolefinic film-forming agent and a silane, also a bis-maleamic acid of general formula: ##STR3## wherein X is a group (CHR) n in which n is an integer from 2 to 18 and R is hydrogen or an alkyl with 1-6 carbon atoms, or X is a bivalent cycloaliphatic or aromatic group also having several nuclei, or a heterocyclic group; R' is hydrogen, the two R's together being also capable of forming a group (CHR) n when X is (CHR) n ; said coating being obtained by passing the fibers, after their leaving the spinneret, through an aqueous finishing bath containing, by weight, from 0.5 to 10% of polyolefinic film-forming agent, from 0.01 to 3% of silane and from 0.01 to 3% of bis-maleamic acid.
Claim 3
Dependent Claim
46 words
Glass fibers according to claim 1, in which the polyolefinic film-forming agent is a terpolymer consisting of, 67% ethylene, 30% propylene and 3% 5-ethylidene-2-norbornene, the silane is γ-aminopropyl-triethoxy-silane and the bis-maleamic acid is selected from the group consisting of N,N'-hexamethylene-bis-maleamic acid, N,N'-dodecamethylene-bis-maleamic acid and N,N'-isophoron-bis-maleamic acid.
Claim 4
Dependent Claim
25 words
Blends consisting of (a) 50-90% by weight of a crystalline polyolefin and (b) 50-10% by weight of glass fibers according to claims 1 or 2.
Claim 5
Dependent Claim
12 words
Blends according to claim 3, in which the crystalline polyolefin is polypropylene.
Claim 6
Dependent Claim
12 words
Blends according to claim 3, in which the crystalline polyolefin is polyethylene.
Claim 7
Dependent Claim
22 words
Polyolefins reinforced with glass fibers, in the form of a granular product obtained by granulation of the blends according to claim 3.
Claim 8
Dependent Claim
20 words
Manufactured articles reinforced with glass fibers, obtained by subjecting to molding according to known methods blends according to claim 3.
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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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |