US4420512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emulsion type sizing agent for carbon fibers, process for its preparation, and method for using same
Assignee: Teijin Ltd
•
Filing: 1982-09-07
•
Granted: 1983-12-13
•
Expires: 2002-09-07
Abstract
Abstract An aqueous emulsion type sizing agent for carbon fibers is disclosed. The sizing agent contains a compound represented by the following general formula (I): ##STR1## wherein A represents (C 2 H 4 O) l or (C 2 H 4 O) n (C 3 H 6 O) m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1≦n/m≦35)]; a compound represented by the following general formula (II): ##STR2## wherein R represents C q H 2q+1 or ##STR3## (q is 10 to 18; and p is 15 to 70); and an epoxy resin, a process for preparation of the agent, and the method for using it are also disclosed. The sizing agent has excellent emulsion stability and heat stability, and it can impart excellent bundling properties to carbon fibers.
Inventors
- 👤 Hiroyasu Ogawa
- 👤 Mikio Shima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:22
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/14
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
93 words
An aqueous emulsion type sizing agent for carbon fibers, comprising: a compound represented by the following general formula (I): ##STR22## wherein A represents (C 2 H 4 O) l or (C 2 H 4 O) n (C 3 H 6 O) m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1≦n/m≦35)]; a compound represented by the following general formula (II): ##STR23## wherein R represents C q H 2q+1 or ##STR24## (q is 10 to 18; and p is 15 to 70); and an epoxy resin.
Claim 2
Dependent Claim
93 words
An aqueous emulsion type sizing agent for carbon fibers, comprising: a compound represented by the following general formula (I): ##STR22## wherein A represents (C 2 H 4 O) l or (C 2 H 4 O) n (C 3 H 6 O) m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1≦n/m≦35)]; a compound represented by the following general formula (II): ##STR23## wherein R represents C q H 2q+1 or ##STR24## (q is 10 to 18; and p is 15 to 70); and an epoxy resin.
Claim 3
Dependent Claim
24 words
The sizing agent as claimed in claim 1, wherein the proportion of the compounds represented by the general formulae (I) and (II) is: ##EQU4##
Claim 4
Dependent Claim
30 words
The sizing agent as claimed in claim 1, wherein said epoxy resin or its solution diluted with a diluent having a viscosity of 100 to 20,000 poises at 45° C.
Claim 5
Dependent Claim
43 words
The sizing agent as claimed in claim 1, wherein said epoxy resin is a bisphenol type, phenol type, vinyl ester type, ether type of glycidylamine type epoxy resin, an alicyclic epoxy resin, epoxidized polybutadiene, epoxidized sorbitol, polyurethane-modified epoxy resin, or a mixture thereof.
Claim 6
Dependent Claim
29 words
The sizing agent as claimed in claim 1, further comprising an additional ingredient selected from the group consisting of a lubricant, a softening agent, a diluent, and a solvent.
Claim 7
Dependent Claim
45 words
The sizing agent as claimed in claim 1, which contains 1 to 50 parts by weight of the compound of the general formula (I), 0.05 to 25 parts by weight of the compound (II), and 50 to 99 parts by weight of the epoxy resin.
Claim 8
Dependent Claim
17 words
The sizing agent as claimed in claim 1 having a solid concentration of 30 to 60 weight%.
Claim 9
Dependent Claim
17 words
The sizing agent as claimed in claim 1, having a solid concentration of 0.1 to 20 weight%.
Claim 10
Dependent Claim
23 words
The sizing agent as claimed in claim 6, further comprising 0 to 25 parts by weight of a solvent for the epoxy resin.
Claim 11
Dependent Claim
33 words
The sizing agent as claimed in claim 6, which contains at least one of a lubricant, softening agent, and diluent in a content of 20 wt% or less based on the epoxy resin.
Claim 12
Dependent Claim
32 words
The sizing agent as claimed in claim 1, wherein the amount of the diluent is such that the diluted epoxy resin has a viscosity of 100 to 20,000 poises at 45° C.
Claim 13
Dependent Claim
36 words
The sizing agent as claimed in claim 5, wherein the amount of the solvent is such that the mixture of the ingredients other than water shows a viscosity of 100 to 1,000 poises at 45° C.
Claim 14
Dependent Claim
109 words
A process for preparing an aqueous emulsion type sizing agent for carbon fibers, which comprises heating a compound represented by the following general formula (I): ##STR25## wherein A represents (C 2 H 4 O) l or (C 2 H 4 O) n (C 3 H 6 O) m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1≦n/m≦35)]; a compound represented by the following general formula (II): ##STR26## wherein R represents C q H 2q+1 or ##STR27## (q is 10 to 18; and p is 15 to 70); and an epoxy resin; mixing and adding thereto water to cause phase inversion emulsification.
Claim 15
Dependent Claim
109 words
A process for preparing an aqueous emulsion type sizing agent for carbon fibers, which comprises heating a compound represented by the following general formula (I): ##STR25## wherein A represents (C 2 H 4 O) l or (C 2 H 4 O) n (C 3 H 6 O) m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1≦n/m≦35)]; a compound represented by the following general formula (II): ##STR26## wherein R represents C q H 2q+1 or ##STR27## (q is 10 to 18; and p is 15 to 70); and an epoxy resin; mixing and adding thereto water to cause phase inversion emulsification.
Claim 16
Dependent Claim
40 words
The process as claimed in claim 13, wherein the compounds represented by the general formulae (I) and (II), epoxy resin, are combined with an additional compound selected from the group consisting of a lubricant, a diluent, and a softening agent.
Claim 17
Dependent Claim
16 words
The process as claimed in claim 13, wherein the heating temperature is 40° to 120° C.
Claim 18
Dependent Claim
32 words
The process as claimed in claim 13, wherein a solvent is added to the mixture in order to adjust the viscosity of the mixture to 100 to 1,000 poises at 45° C.
Claim 19
Independent Claim
98 words
A method for sizing carbon fibers, comprising: depositing on the fibers a sizing agent containing: a compound represented by the following general formula (I): ##STR28## wherein A represents (C 2 H 4 O) l or (C 2 H 4 O) n (C 3 H 6 O) m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1≦n/m≦35)]; a compound represented by the following general formula (II): ##STR29## wherein R represents C q H 2q+1 or ##STR30## (q is 10 to 18; and p is 15 to 70); and an epoxy resin.
Claim 20
Independent Claim
98 words
A method for sizing carbon fibers, comprising: depositing on the fibers a sizing agent containing: a compound represented by the following general formula (I): ##STR28## wherein A represents (C 2 H 4 O) l or (C 2 H 4 O) n (C 3 H 6 O) m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1≦n/m≦35)]; a compound represented by the following general formula (II): ##STR29## wherein R represents C q H 2q+1 or ##STR30## (q is 10 to 18; and p is 15 to 70); and an epoxy resin.
Claim 21
Dependent Claim
31 words
The sizing method as claimed in claim 17, wherein the deposition is conducted at 10° to 40° C., followed by drying at 80° to 200° C. for 0.1 to 10 minutes.
Claim 22
Dependent Claim
21 words
The sizing method as claimed in claim 17, wherein the solid concentration of the sizing agent is 0.1 to 20 wt%.
Claim 23
Dependent Claim
36 words
The sizing method as claimed in claim 17, wherein solids of the sizing agent are deposited on the carbon fibers in an amount of 0.1 to 10 wt% based on the weight of the carbon fibers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |