Patent US1966556A successfully refreshed from Google Patents.
EP0175484A2
Expired / Lapsed
EP
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Sized fibres
Assignee: BP Corp North America Inc
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Filing: 1985-08-19
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Granted: —
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Expires: 2005-08-19
Abstract
Abstract Thermally stable fibres, especially carbon or graphite fibres, which have been sized with an amide-imide polymer preferably an amide-imide polymer in which the repeating units comprise a mixture of amide-amic acid units and imide units or a mixture of amide-amic acid units and amide units. The use of such sized fibres in the production of fibre reinforced amide-imide resin composites reduces the generation of volatiles during the formation of the composites and provides improved fibre-matrix adhesion.
Inventors
- 👤 Bill Wayne Cole
- 👤 Robert Burton Hanson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:31
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08J5/24; C08J5/241; C08J5/243; C08J5/248; D; D01; D01F; D01F11/00; D01F11/10; D01F11/14; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
16 words
A thermally stable fiber having coated on the surface thereof a sizing composition of amide-imide polymer.
Claim 2
Dependent Claim
16 words
A thermally stable fiber having coated on the surface thereof a sizing composition of amide-imide polymer.
Claim 3
Dependent Claim
37 words
A coated fibre as claimed in claim 1 wherein the sizing composition is present on said fiber in an amount of from about 0.1 to about 5 percent by weight based on the weight of the fiber.
Claim 4
Dependent Claim
119 words
A coated fibre as claimed in claim 1 or claim 2 wherein said amide-imide polymer comprises recurring units selected from the group consisting of (I) A units of: capable of undergoing imidization, wherein - denotes isomerization, and (II) B units of: wherein said B units comprise less than about 25 mole percent of the total A and B units in the polymer, and, wherein for both A and B units each R is a divalent, aromatic hydrocarbon radical of from 6 to about 10 carbon atoms, or two divalent aromatic hydrocarbon radicals each of from 6 to about 10 carbon atoms joined directly or by stable linkages selected from the group consisting of -0-, methylene, -CO-, -SO,-, and -S-.
Claim 5
Dependent Claim
11 words
A coated fibre as claimed in claim 3 wherein R is
Claim 6
Dependent Claim
33 words
A coated fibre as claimed in claim 3 wherein R is a mixture of: and wherein the ratio of (a) to (b) is between about 50 to 50 and about 90 to 10.
Claim 7
Dependent Claim
34 words
A coated fibre as claimed in claim 3, claim 4 or claim 5 but wherein said B units comprise more than 60 mole percent of the total A and B units in said polymer.
Claim 8
Dependent Claim
110 words
A coated fibre as claimed in claim 1 or claim 2 wherein said amide-imide polymer comprises recurring A units of: capable of undergoing imidization wherein - denotes isomerization and polyamide C units of: wherein the molar ratio of A units to C units is between about 80 to 20 and about 20 to 80 and each R is a divalent aromatic hydrocarbon radical of from 6 to about 10 carbon atoms or 2 divalent aromatic hydrocarbon radicals of about 6 to about 10 carbon atoms joined directly or by stable linkages selected from the group consisting of -0-, methylene, -CO-, -SO,- and -S- and X is a divalent aromatic radical.
Claim 9
Dependent Claim
15 words
A coated fibre as claimed in claim 7 wherein R and X are each or
Claim 10
Dependent Claim
51 words
A coated fibre as claimed in claim 1 or claim 2 wherein said polymer comprises a mixture of (1) about 10 to about 90 weight percent of a polyamide-imide as claimed in claim 3 and (2) about 90 to about 10 weight percent of a polyamide as claimed in claim 6.
Claim 11
Dependent Claim
37 words
A coated fibre as claimed in any one of claims 1 to wherein said fibre is selected from carbon fibre, glass fibre. alumina fibre, steel fibre, silica nitride fibre, silicon carbide fibre, boron fibre, and Kevlar fibre.
Claim 12
Independent Claim
47 words
A method for preparing a coated fibre as claimed in any one of claims 1 to 10 which comprises coating the thermally stable fibre with a solution containing an amide-imide polymer in a solvent and then drying the coated fibre to remove substantially all of the solvent.
Claim 13
Dependent Claim
95 words
A method as claimed in claim 11 wherein said amide-imide polymer comprises recurring units selected from the group consisting of (I) A units of: capable of undergoining imidization, wherein - denotes isomerisation and (II) B units of: wherein for both A and B units each R is a divalent, aromatic hydrocarbon radical of from 6 to about 10 carbon atoms, or two divalent aromatic hydrocarbon radicals each of from 6 to about 10 carbon atoms joined directiy or by stable linkages selected from the group consisting of -0-, methylene, -CO-, -SO 2 -, and -S-.
Claim 14
Dependent Claim
26 words
A method as claimed in claim 11 or claim 12 wherein said solution contains about 0.05 to about 10 percent by weight of said amide-imide polymer.
Claim 15
Dependent Claim
49 words
1 4 . A method for preparing a coated fibre as claimed in claim 1 which comprises contacting a fabric formed from the thermally stable fibre with a solution containing an amide-imide polymer in a solvent and then drying the coated fabric to remove substantially all of the solvent
Claim 16
Dependent Claim
32 words
A coated fibre as claimed in any one of claims 1 to 10, or when obtained by the method claimed in any one of claims 11 to 13, woven into a fabric.
References Cited (Backward Citations)
No citation records indexed.
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