Claims
- 1. A method of producing a self-crimping phenolic composite fiber having heat-resistant and flameproof properties, said method comprising melt-spinning (A) a modified phenolic resin obtained by melt blending a heat-meltable uncured novolak resin with 0.5 - 30% by weight, based on the total weight of the mixture, of a heat-meltable fiber-forming resin selected from polyamide resin, polyester resin, polyurethane resin or polyolefin resin, and (B) a heat-meltable uncured novolak resin, said melt-spinning being carried out such that the components (A) and (B) are united in an eccentric or side-by-side relationship, and thereafter curing the phenolic resin component contained in the resulting heat-meltable composite fiber.
- 2. A method of producing a self-crimping phenolic composite fiber having heat-resistant flameproof properties, said method comprising melt-spinning (A) a modified phenolic resin obtained by melt blending a heat-meltable uncured novolak resin with 0.5 - 30% by weight, based on the total weight of the mixture, of a heat-meltable fiber-forming resin selected from polyamide resin, polyester resin, polyurethane resin or polyolefin resin, and (B) a heat-meltable uncured novolak resin, said melt-spinning being carried out such that the components (A) and (B) are united in an eccentric or side-by-side relationship, curing the phenolic resin component contained in the resulting heat-meltable composite fiber and thereafter treating said fiber with a swelling agent.
- 3. The method of claim 2 wherein said heat-meltable fiber-forming resin is contained in said modified phenolic resin (A) in an amount of 1 -10% by weight.
- 4. The method of claim 2 wherein said heat-meltable fiber-forming resin is contained in said modified phenolic resin (A) in an amount of 2 - 7% by weight.
- 5. The method of claim 2 wherein the weight ratio of said modified phenolic resin (A) to said heat-meltable uncured novolak resin (B) ranges between 10:90 and 90:10.
- 6. The method of claim 2 which comprises carrying out the cure of the phenolic resin component contained in the heat-meltable composite fiber until a degree of crosslinking of 5 - 45 mol % is achieved.
- 7. The method of claim 2 which comprises carrying out the cure of the phenolic resin component contained in the heat-meltable composite fiber until a degree of crosslinking of 10 - 35 mol % is achieved.
- 8. The method of claim 2 wherein said heat-meltable fiber-forming resin is a polyamide.
- 9. The method of claim 2 wherein said curing treatment is carried out by a two-stage process consisting of a precuring and a curing step.
- 10. The method of claim 9 which comprises carrying out the curing treatment by a two-stage process consisting of a precuring and a curing step, said precuring step being carried out using a curing bath in which the content of the acidic catalyst is greater than that of the aldehyde, and said curing step being carried out using a curing bath in which the content of the acidic or basic catalyst is less than that of the aldehyde.
- 11. The method of claim 1 wherein said heat-meltable fiber-forming resin is contained in said modified phenolic resin (A) in an amount of 1 - 10% by weight.
- 12. The method of claim 1 wherein said heat-meltable fiber-forming resin is contained in said modified phenolic resin (A) in an amount of 2 - 7% by weight.
- 13. The method of claim 1 wherein the weight ratio of said modified phenolic resin (A) to said heat-meltable uncured novolak resin (B) ranges between 10:90 and 90:10.
- 14. The method of claim 1 which comprises carrying out the cure of the phenolic resin component contained in the heat-meltable composite fiber until a degree of crosslinking of 5 - 45 mol % is achieved.
- 15. The method of claim 1 which comprises carrying out the cure of the phenolic resin component contained in the heat-meltable composite fiber until a degree of crosslinking of 10 - 35 mol % is achieved.
- 16. The method of claim 1 wherein said heat-meltable fiber-forming resin is a polyamide.
- 17. The method of claim 1 wherein said curing treatment is carried out by a two-stage process consisting of a precuring and a curing step.
- 18. The method of claim 17 which comprises carrying out the curing treatment by a two-stage process consisting of a pre-curing and a curing step, said precuring step being carried out using a curing bath in which the content of the acidic catalyst is greater than that of the aldehyde, and said curing step being carried out using a curing bath in which the content of the acidic or basic catalyst is less than that of the aldehyde.
Priority Claims (2)
Number |
Date |
Country |
Kind |
47-127905 |
Dec 1972 |
JA |
|
48-115511 |
Oct 1973 |
JA |
|
Parent Case Info
This is a continuation of application Ser. No. 424,696 , filed Dec. 14, 1973 , now abandoned.
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
Country |
Parent |
424696 |
Dec 1973 |
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