Patent US4407866A successfully refreshed from Google Patents.
US4407866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating chopped strand of glass fiber with thermosetting resin
Assignee: Nitto Boseki Co Ltd
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Filing: 1982-03-26
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Granted: 1983-10-04
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Expires: 2002-03-26
Abstract
Abstract This invention provides a process for coating chopped strand of glass fiber with a thermosetting resin in an individually separated state which comprises dispersing chopped strand of glass fiber impregnated with a solution of thermosetting resin into an aqueous medium and then carrying out a removal of solvent. By this process, a pellet-formed glass fiber base material thickly coated with said thermosetting resin and free from filamentation and fuzzy of glass fiber can be obtained by a simple procedure.
Inventors
- 👤 Tadanori Kitamura
- 👤 Nobuyuki Takao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:00
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/12; C03C25/16; B; B29; B29B; B29B15/00; B29B15/08; B29B15/10; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/212; C08K; C08K9/00; C08K9/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A process for coating chopped strands of glass fiber with thermosetting resin which comprises dipping chopped strands of glass fiber in a solution of thermosetting resin of A-stage in a polar solvent soluble or miscible with an aqueous medium to impregnate the chopped strand with the resin solution, separating the impregnated chopped strand, stirring the impregnated chopped strand in the aqueous medium to disperse the impregnated chopped strand and to remove the solvent present in the resin solution contained in the chopped strand into the aqueous medium, separating the chopped resin coated with the desolvated resin form the aqueous medium, and drying the chopped strand.
Claim 2
Dependent Claim
105 words
A process for coating chopped strands of glass fiber with thermosetting resin which comprises dipping chopped strands of glass fiber in a solution of thermosetting resin of A-stage in a polar solvent soluble or miscible with an aqueous medium to impregnate the chopped strand with the resin solution, separating the impregnated chopped strand, stirring the impregnated chopped strand in the aqueous medium to disperse the impregnated chopped strand and to remove the solvent present in the resin solution contained in the chopped strand into the aqueous medium, separating the chopped resin coated with the desolvated resin form the aqueous medium, and drying the chopped strand.
Claim 3
Dependent Claim
39 words
A coating process according to claim (1), wherein the dispersion of chopped strand of glass fiber impregnated with resin solution in an aqueous medium and the removal of solvent are carried out in the temperature range of 10°-30° C.
Claim 4
Dependent Claim
57 words
A coating process according to claim (1), wherein the chopped strand of glass fiber impregnated with resin solution is first dispersed into an aqueous medium having a temperature of 10° C. to 30° C., then temperature is elevated to 40° C. to 70° C. and the dispersion and removal of solvent are carried out at this temperature.
Claim 5
Dependent Claim
15 words
A coating process according to claim (3), wherein the temperature after elevation is 45°-50° C.
Claim 6
Dependent Claim
18 words
A coating process according to any one of claims 1-4, wherein said aqueous medium contains a dispersing agent.
Claim 7
Dependent Claim
15 words
A coating process according to claim (5), wherein said dispersing agent is a water-soluble polymer.
Claim 8
Dependent Claim
14 words
A coating process according to claim (6), wherein said water-soluble polymer is polyvinyl alcohol.
Claim 9
Dependent Claim
17 words
A coating process according to claim 1, wherein said solution of thermosetting resin contains a molding assistant.
Claim 10
Dependent Claim
18 words
A coating process according to claim (8), wherein said molding assistant is a release agent and/or curing catalyst.
Claim 11
Dependent Claim
14 words
A coating process according to claim 1, wherein said thermosetting resin is phenolic resin.
Claim 12
Dependent Claim
27 words
A coating process according to claim 1, wherein said polar solvent is selected from the group consisting of methanol, acetone, diacetone alcohol, dioxane, dimethylformamide and mixtures thereof.
References Cited (Backward Citations)
US2829982A
Cited
US3677804A
Cited
US3935339A
Cited
US3969547A
Cited
US4314599A
Cited
US4176105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |