US4079113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of fibers or films from phenolic resins
Assignee: Mitsubishi Chemical Corp
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Filing: 1976-03-18
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Granted: 1978-03-14
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Expires: 1996-03-18
Abstract
Abstract Fibers or films with high mechanical strengths are produced from novolacs which are obtained by reaction of resols with phenols under neutral or acidic conditions.
Inventors
- 👤 Tomiaki Kimura
- 👤 Masamichi Watanabe
- 👤 Yoichiro Yamakawa
- 👤 Seiichi Mukai
- 👤 Kunihiro Takenaka
- 👤 Masahiro Kita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:51
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/76; C; C08; C08G; C08G8/00; C08G8/04; D01F11/00; D01F11/04; D01F11/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
106 words
In a method for the preparation of a phenolic fiber or film which comprises subjecting a phenolic resin to a melt spinning or melt-forming treatment, and curing the resulting fiber or film by means of an aldehyde, the improvement which comprises: providing as said phenolic resin a novolac having a molecular weight ranging from 500 to 2000 which is obtained by reacting a resol prepared by reacting a phenol and an aldehyde in the presence of ammonia or a primary, secondary or tertiary amine as a catalyst with a phenol under neutral or acidic conditions, wherein said neutral or acidic conditions are attained with oxalic acid.
Claim 2
Dependent Claim
106 words
In a method for the preparation of a phenolic fiber or film which comprises subjecting a phenolic resin to a melt spinning or melt-forming treatment, and curing the resulting fiber or film by means of an aldehyde, the improvement which comprises: providing as said phenolic resin a novolac having a molecular weight ranging from 500 to 2000 which is obtained by reacting a resol prepared by reacting a phenol and an aldehyde in the presence of ammonia or a primary, secondary or tertiary amine as a catalyst with a phenol under neutral or acidic conditions, wherein said neutral or acidic conditions are attained with oxalic acid.
Claim 3
Dependent Claim
28 words
The method according to claim 1, wherein the amount of said ammonia or amine catalyst is in the range of 0.5 to 20 mole % to said phenol.
Claim 4
Dependent Claim
19 words
The method according to claim 1, wherein the interaction is effected at a temperature of 40° to 100° C.
Claim 5
Dependent Claim
12 words
The method according to claim 1, wherein the solution conditions are acid.
Claim 6
Dependent Claim
25 words
The method according to claim 1, wherein the reaction between said resol and said phenol is effected at a temperature of 70° to 120° C.
Claim 7
Dependent Claim
11 words
The method according to claim 1, wherein said aldehyde is formaldehyde.
Claim 8
Dependent Claim
29 words
The method according to claim 1, wherein said fiber or film is cured by heating said fiber or film with said aldehyde in the presence of an acid catalyst.
Claim 9
Dependent Claim
17 words
The method according to claim 7, wherein said acid catalyst for said curing reaction is hydrochloric acid.
Claim 10
Dependent Claim
45 words
The method according to claim 7, wherein said curing is effected by heating said fiber or film from 20° - 40° C to 80° - 130° over a period of 1 to 5 hours and maintained at the elevated temperature for 5 to 50 hours.
Claim 11
Dependent Claim
42 words
The method according to claim 1, wherein said curing by said aldehyde is effected in two stages wherein said fiber or film is first heated in the presence of an acid catalyst and then heated in the presence of a basic catalyst.
Claim 12
Dependent Claim
87 words
The method according to claim 10, wherein the first stage heating in the presence of said acid catalyst is conducted by raising the temperature of the fiber or film from 20° - 40° C to 80° - 130° C over a period of 0.5 to 4 hours and keeping the elevated temperature for 0.5 to 4 hours and the second stage heating in the presence of said basic catalyst is conducted by keeping the film or fiber at 70° to 120° C for 0.5 to 3 hours.
Claim 13
Dependent Claim
124 words
In a method for the preparation of a phenolic fiber or film which comprises subjecting a phenolic resin to a melt spinning or film-forming treatment and curing the resulting fiber or film by means of an aldehyde, the improvement which comprises: providing as said phenolic resin a mixture containing (1) a novolac having a molecular weight ranging from 500 to 2000 obtained by reacting a resol prepared by reacting a phenol and an aldehyde in the presence of ammonia or a primary, secondary or tertiary amine as a catalyst with a phenol under a neutral or acidic conditions, wherein said neutral or acidic conditions are attained with oxalic acid and (2) a polyamide in an amount of 0.5 to 40% by weight of novolac.
Claim 14
Dependent Claim
124 words
In a method for the preparation of a phenolic fiber or film which comprises subjecting a phenolic resin to a melt spinning or film-forming treatment and curing the resulting fiber or film by means of an aldehyde, the improvement which comprises: providing as said phenolic resin a mixture containing (1) a novolac having a molecular weight ranging from 500 to 2000 obtained by reacting a resol prepared by reacting a phenol and an aldehyde in the presence of ammonia or a primary, secondary or tertiary amine as a catalyst with a phenol under a neutral or acidic conditions, wherein said neutral or acidic conditions are attained with oxalic acid and (2) a polyamide in an amount of 0.5 to 40% by weight of novolac.
Claim 15
Dependent Claim
126 words
In a method for the preparation of a phenolic fiber or film which comprises subjecting a phenolic resin to a melt spinning or film-forming treatment and curing the resulting fiber or film by means of an aldehyde, the improvement which comprises: providing as said phenolic resin a novolac having a molecular weight ranging from 500 to 2000 obtained by reacting a resol prepared by reacting a phenol and an aldehyde in the presence of ammonia or a primary, secondary or tertiary amine as a catalyst with a phenol under neutral or acidic conditions, wherein said neutral or acidic conditions are attained with oxalic acid, and subjecting the cured fiber or film to a treatment which blocks phenolic hydroxyl groups of the novolac by esterification or etherification.
Claim 16
Dependent Claim
126 words
In a method for the preparation of a phenolic fiber or film which comprises subjecting a phenolic resin to a melt spinning or film-forming treatment and curing the resulting fiber or film by means of an aldehyde, the improvement which comprises: providing as said phenolic resin a novolac having a molecular weight ranging from 500 to 2000 obtained by reacting a resol prepared by reacting a phenol and an aldehyde in the presence of ammonia or a primary, secondary or tertiary amine as a catalyst with a phenol under neutral or acidic conditions, wherein said neutral or acidic conditions are attained with oxalic acid, and subjecting the cured fiber or film to a treatment which blocks phenolic hydroxyl groups of the novolac by esterification or etherification.
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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |