Patent US2586109A successfully refreshed from Google Patents.
US5284702A
Expired / Lapsed
US
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Low fuming phenolic resin prepreg and process for producing the same
Assignee: Teijin Ltd
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Filing: 1991-08-15
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Granted: 1994-02-08
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Expires: 2011-08-15
Abstract
Abstract A low fuming phenolic resin prepreg comprising a fibrous base impregnated with 20 to 60% by weight of a resin composition comprising (a) 100 parts by weight of a resol phenolic resin, (b) from 1.5 to 15 parts by weight of polyacrylamide, (c) from 1.5 to 25 parts by weight of an epoxy resin, and (d) from 1.5 to 15 parts by weight of an inorganic filler, and the method for preparing the prepreg by impregnating a solution of (a), (b) and (c) having dispersed therein the filler into a fibrous base. The method for the prepreg comprising impregnating the fibrous base with the resin composition. The phenolic resin prepreg has low fuming properties as well as excellent self-adhesion.
Inventors
- 👤 Yoshitaka Umemoto
- 👤 Takayuki Tanaka
- 👤 Yasuo Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:33
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/04; C08L61/06; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J5/249; C08J2361/00; C08J2361/04; C08J2361/06; C08L33/00; C08L33/24; C08L33/26; C08L63/00; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2738
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
91 words
A low fuming phenolic resin prepreg comprising a fibrous base impregnated with 20 to 60% by weight of a resin composition comprising (a) 100 parts by weight of a resol phenolic resin, (b) from 1.5 to 15 parts by weight of polyacrylamide, (c) from 1.5 to 25 parts by weight of an epoxy resin, and (d) from 1.5 to 15 parts by weight of an inorganic filler, wherein said epoxy resin is water-soluble or capable of forming an emulsion, and wherein said polyacrylamide has a molecular weight of 300,000 or more.
Claim 2
Dependent Claim
91 words
A low fuming phenolic resin prepreg comprising a fibrous base impregnated with 20 to 60% by weight of a resin composition comprising (a) 100 parts by weight of a resol phenolic resin, (b) from 1.5 to 15 parts by weight of polyacrylamide, (c) from 1.5 to 25 parts by weight of an epoxy resin, and (d) from 1.5 to 15 parts by weight of an inorganic filler, wherein said epoxy resin is water-soluble or capable of forming an emulsion, and wherein said polyacrylamide has a molecular weight of 300,000 or more.
Claim 3
Dependent Claim
34 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein said resol phenolic resin is a water-soluble or water-insoluble organic solvent-soluble and the organic solution thereof is water-dispersible to form an emulsion.
Claim 4
Dependent Claim
17 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein said polyacrylamide is water soluble.
Claim 5
Dependent Claim
31 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein said epoxy resin is a bisphenol A epoxy resin, a phenol novolak epoxy resin or a urethane-modified epoxy resin.
Claim 6
Dependent Claim
28 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein said inorganic filler is a powder of alumina, silica, titanium oxide, silicates, calcium carbonate or metals.
Claim 7
Dependent Claim
27 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein said inorganic filler is a mixture of silica fine powder and aluminum oxide ultrafine powder.
Claim 8
Dependent Claim
22 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein said inorganic filler is a silane coupling agent-treated inorganic filler.
Claim 9
Dependent Claim
46 words
A low fuming phenolic resin prepreg as claimed in claim 7, wherein said silane coupling agent is represented by the following formula: YRSiX.sub.3 wherein Y represents an organic group reactive with the matrix resin, R represents an aliphatic hydrocarbon group, and X represents a hydrolyzable group.
Claim 10
Dependent Claim
23 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein said fibrous base is glass fiber, carbon fiber or aramid fiber.
Claim 11
Dependent Claim
24 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein said fibrous base is woven fabric, nonwoven fabric or unidirectional filament sheet.
Claim 12
Dependent Claim
25 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein the amount of the polyacrylamide is from 3 to 10 parts by weight.
Claim 13
Dependent Claim
26 words
A low fuming phenolic resin prepreg as claimed in claim 1, wherein the amount of the epoxy resin is from 2 to 20 parts by weight.
Claim 14
Dependent Claim
25 words
A low-fuming phenolic resin prepreg as claimed in claim 1, wherein the amount of the inorganic filler is from 2 to 15 parts by weight.
Claim 15
Dependent Claim
25 words
A low fuming phenolic resin prepreg as claimed in Claim 1, wherein said inorganic filler has a mean diameter of from 1 to 200 nm.
Claim 16
Dependent Claim
34 words
A low-fuming phenolic resin prepreg as claimed in claim 1, wherein the amount of the polyacrylamide is 3.0 to 15.0 parts by weight and the equivalent of the epoxy compound is 650 or more.
Claim 17
Dependent Claim
129 words
A process for producing a low-fuming phenolic resin prepreg comprising uniformly mixing (a) 100 parts by weight of a resol phenolic resin, (b) from 1.5 to 15 parts by weight of polyacrylamide, (c) from 1.5 to 25 parts by weight of an epoxy resin, and (d) from 1.5 to 15 parts by weight of an inorganic filler to prepare a dispersion having a solids content of from 30 to 85% by weight in a liquid diluent, and impregnating the resin composition into a fibrous base in an amount of from 20 to 60% by weight of the resin composition, and drying the impregnated fibrous base, wherein said epoxy resin is water-soluble or capable of forming an emulsion, and wherein said polyacrylamide has a molecular weight of 300,000 or more.
Claim 18
Dependent Claim
129 words
A process for producing a low-fuming phenolic resin prepreg comprising uniformly mixing (a) 100 parts by weight of a resol phenolic resin, (b) from 1.5 to 15 parts by weight of polyacrylamide, (c) from 1.5 to 25 parts by weight of an epoxy resin, and (d) from 1.5 to 15 parts by weight of an inorganic filler to prepare a dispersion having a solids content of from 30 to 85% by weight in a liquid diluent, and impregnating the resin composition into a fibrous base in an amount of from 20 to 60% by weight of the resin composition, and drying the impregnated fibrous base, wherein said epoxy resin is water-soluble or capable of forming an emulsion, and wherein said polyacrylamide has a molecular weight of 300,000 or more.
Claim 19
Dependent Claim
19 words
A process as claimed in claim 16, wherein said diluent is water or a mixture of water and methanol.
Claim 20
Dependent Claim
21 words
A process as claimed in claim 16, wherein said inorganic filler has a mean diameter of from 1 to 200 nm.
Claim 21
Dependent Claim
11 words
The process of claim 16, wherein said polyacrylamide is water soluble.
Claim 22
Dependent Claim
31 words
A process as claimed in claim 16, wherein the amount of the polyacrylamide is 3.0 to 15.0 parts by weight and the equivalent of the epoxy compound is 650 or more.
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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) | 1997-02-07 | 1997-08-09 | 1998-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-07 | 2001-08-09 | 2002-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-07 | 2005-08-09 | 2006-02-08 | $7700.00 | Window Closed / Lapsed |