US4145472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous carbonaceous material sized with a glycidylhydantoin sizing
Assignee: Fiberite Inc
•
Filing: 1977-09-06
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Granted: 1979-03-20
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Expires: 1997-09-06
Abstract
Abstract A water soluble sizing for fibrous carbonaceous material consists of either 1,3-diglycidyl-5,5-dimethylhydantoin or 1,3-diglycidylhydantoin. The carbonaceous material is sized by immersion in an aqueous solution of the sizing having a concentration of 0.1-10%, preferably 1-2%, by weight, followed by drying. In addition to being highly water soluble, non-toxic and non-flammable, the sizing provides excellent filament control so as to minimize fuzzing during subsequent handling of the carbonaceous material and is compatible with an epoxy resin matrix system.
Inventors
- 👤 Raymond G. Spain
- 👤 Albert L. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:59
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/2964; Y10T428/30
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
11 words
Carbon fibers having a water soluble sizing thereon consisting of 1,3-diglycidyl-5,5-dimethylhydantoin.
Claim 2
Dependent Claim
11 words
Carbon fibers having a water soluble sizing thereon consisting of 1,3-diglycidyl-5,5-dimethylhydantoin.
Claim 3
Dependent Claim
17 words
The invention set forth in claim 1, wherein the sizing comprises 0.1-2% by weight of the fibers.
Claim 4
Dependent Claim
23 words
The invention set forth in claim 1, further comprising an at least partially cured epoxy resin forming a composite with the carbon fibers.
Claim 5
Dependent Claim
23 words
Fibrous carbonaceous material having a water soluble sizing thereon having the formula: ##STR5## where R and R' are selected from low alkyl groups.
Claim 6
Dependent Claim
23 words
Fibrous carbonaceous material having a water soluble sizing thereon having the formula: ##STR5## where R and R' are selected from low alkyl groups.
Claim 7
Dependent Claim
13 words
The invention set forth in claim 4, wherein the sizing consists of 1,3-diglycidyl-5,5-dimethylhydantoin.
Claim 8
Dependent Claim
13 words
The invention set forth in claim 4, wherein the sizing consists of 1,3-diglycidylhydantoin.
Claim 9
Dependent Claim
13 words
The invention set forth in claim 4, wherein the sizing consists of 1,3-diglycidyl-5-methylhydantoin.
Claim 10
Dependent Claim
60 words
In a method of treating fibrous carbonaceous material to facilitate filament control during processing of the material in which the material is immersed in an aqueous solution of a sizing and thereafter dried, the improvement consisting of using a sizing having the formula: ##STR6## where R and R' are selected from the group consisting of H and CH 3 .
Claim 11
Dependent Claim
60 words
In a method of treating fibrous carbonaceous material to facilitate filament control during processing of the material in which the material is immersed in an aqueous solution of a sizing and thereafter dried, the improvement consisting of using a sizing having the formula: ##STR6## where R and R' are selected from the group consisting of H and CH 3 .
Claim 12
Dependent Claim
27 words
The invention set forth in claim 8, wherein the step of drying the material is carried out by exposing the material to heated air in an oven.
Claim 13
Dependent Claim
18 words
The invention set forth in claim 8, wherein the aqueous solution has a concentration of 0.1-10% by weight.
Claim 14
Dependent Claim
13 words
The invention set forth in claim 8, wherein the sizing consists of 1,3-diglycidyl-5,5-dimethylhydantoin.
Claim 15
Dependent Claim
43 words
The invention set forth in claim 8 comprising the further steps of processing the fibrous carbonaceous material following drying thereof, impregnating the material with epoxy resin, forming the material into a laminate and at least partially curing the resin to form a composite.
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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |