US4451585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin-impregnated fibre composite materials and a process for their manufacture
Assignee: Kemanord AB
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Filing: 1982-06-09
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Granted: 1984-05-29
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Expires: 2002-06-09
Abstract
Abstract The invention relates to a method for producing a fibre composite material, which comprises glass- and/or mineral fibres, expanded microspheres and a curable resin. In the method a melt of glass or mineral is prepared and the melt is converted to discrete fibres by means of nozzles. A water-based solution or dispersion of a thermosetting resin is applied to the fibres, which solution or dispersion contains microspheres. The obtained material is collected and the microspheres are brought to expand before or after the collecting. The invention also relates to a final treatment of the obtained material in which the material is pressed or formed and brought to set to the C-stage. The invention also relates to the products obtained by the method.
Inventors
- 👤 Bengt Andersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:54
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C08; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J9/00; C08J9/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A method for producing a fibre composite material containing fibres, expanded thermoplastic microspheres and a resin of curable type, comprising the steps of (a) dispersing in a room separate and free fibres, (b) applying to the dispersed and free fibres (1) a curable resin and (2) unexpanded thermoplastic microspheres containing a volatile, liquid blowing agent, (c) heating the unexpanded thermoplastic microspheres until they expand and (d) collecting an agglomerate of fibres, expanded microspheres and resin.
Claim 2
Independent Claim
75 words
A method for producing a fibre composite material containing fibres, expanded thermoplastic microspheres and a resin of curable type, comprising the steps of (a) dispersing in a room separate and free fibres, (b) applying to the dispersed and free fibres (1) a curable resin and (2) unexpanded thermoplastic microspheres containing a volatile, liquid blowing agent, (c) heating the unexpanded thermoplastic microspheres until they expand and (d) collecting an agglomerate of fibres, expanded microspheres and resin.
Claim 3
Dependent Claim
22 words
The method of claim 1 in which the unexpanded thermoplastic microspheres and the resin are mixed before being applied to the fibres.
Claim 4
Dependent Claim
21 words
A method according to claim 1 in which the curable resin is a formaldehyde-based resin with urea, phenol, resorcinol and/or melamine.
Claim 5
Dependent Claim
23 words
A method according to claim 1 or 3 in which the resin is applied in the form of a water-based solution or dispersion.
Claim 6
Dependent Claim
20 words
A method according to claim 1 in which the discrete fibres are formed from a melt of glass or mineral.
Claim 7
Dependent Claim
29 words
A method according to claim 1 or 5 in which the curable resin is applied to the free fibers in a room or a shaft having an elevated temperature.
Claim 8
Dependent Claim
27 words
A method according to claim 6 in which the temperature in the room or shaft is between 80° to 150° C., preferably between 100° and 120° C.
Claim 9
Dependent Claim
20 words
A method according to claim 1 in which the resin is transformed essentially into the B-stage in the collected agglomerate.
Claim 10
Dependent Claim
25 words
A method according to claim 1 in which the collected agglomerate is formed and the resin is cured to the C-stage at an elevated temperature.
Claim 11
Dependent Claim
23 words
A method according to claim 1 in which the ratio of applied weight amounts of microspheres to resin is between 5:95 and 80:40.
References Cited (Backward Citations)
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US4108806A
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US3730920A
Cited
US4005033A
Cited
US4309334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |