US3897533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing moldable reinforced thermoplastic material and articles therefrom
Assignee: Individual
•
Filing: 1973-07-02
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Granted: 1975-07-29
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Expires: 1993-07-02
Abstract
Abstract Glass fiber mat is impregnated with an aqueous emulsion of vinyl chloride polymer containing a small amount of water-immiscible organic solvent. The impregnated glass fiber mat is dried to remove water and organic solvent. Moldable reinforced thermoplastic material is obtained in which vinyl chloride polymer particles coalesce firmly with one another and adhere firmly to glass fiber. The material thus obtained can be molded into desired finished product under heat and pressure.
Inventors
- 👤 Hiroshi Hani
- 👤 Kazuo Hiraga
- 👤 Masuo Tsudome
- 👤 Hiroshi Kageyama
- 👤 Shunichi Ito
- 👤 Shinji Iwai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:03
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/504; B29B; B29B15/00; B29B15/08; B29B15/10; B29B15/12; B29B15/122; B29B15/125; B29C70/06; B29C70/10; Y; Y10; Y10S; Y10S264/00; Y10S264/53
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A METHOD OF PRODUCING MOLDABLE REINFORCED THERMOSPLASTHE SHEET MATERIAL FROM VINYL CHLORIDE POLYMER HAVING POOR ADHESIVE PROPERTY TO REINFORCING GLASS FIBER AND TO ITSELF, WHICH COMPRISES IMPREGNATING A REINFORCING GLASS FIBER MAT HAVING GLASS FIBER LONGER THAN ONE-HALF INCH WITH AN OIL-IN-WATER EMULSION OF VINYL CHLORIDE POLYMER RESIN PARTICLES CONTAINING AN ORGANIC SOLVENT CAPABLE OF PARTIALLY SWELLING THE RESIN PARTICLES UNTIL THE IMPREGNATED POLYMER CONTENT REACHES TO 60 TO 90% BY WEIGHT OF THE SHEET MATERIAL TO BE PRODUCED, SAID EMULSION
Claim 2
Independent Claim
81 words
A METHOD OF PRODUCING MOLDABLE REINFORCED THERMOSPLASTHE SHEET MATERIAL FROM VINYL CHLORIDE POLYMER HAVING POOR ADHESIVE PROPERTY TO REINFORCING GLASS FIBER AND TO ITSELF, WHICH COMPRISES IMPREGNATING A REINFORCING GLASS FIBER MAT HAVING GLASS FIBER LONGER THAN ONE-HALF INCH WITH AN OIL-IN-WATER EMULSION OF VINYL CHLORIDE POLYMER RESIN PARTICLES CONTAINING AN ORGANIC SOLVENT CAPABLE OF PARTIALLY SWELLING THE RESIN PARTICLES UNTIL THE IMPREGNATED POLYMER CONTENT REACHES TO 60 TO 90% BY WEIGHT OF THE SHEET MATERIAL TO BE PRODUCED, SAID EMULSION
Claim 3
Dependent Claim
26 words
The method as claimed in claim 1 in which vinyl chloride polymer is selected from the group consisting of polyvinyl chloride and copolymer of vinyl chloride.
Claim 4
Independent Claim
170 words
A method of producing moldable reinforced thermoplastic sheet material from vinyl chloride polymer having poor adhesive property to reinforcing glass fiber and to itself, which comprises impregnating a reinforcing glass fiber mat having glass fiber longer than one-half inch with an oil-in-water emulsion of vinyl chloride polymer resin particles containing an organic solvent capable of partially swelling the resin particles until the impregnated polymer content reaches to 60 to 90% by weight of the sheet material to be produced, said emulsion containing over about 30% by weight based upon the emulsion, of the polymer resin and from 5 to 30% by weight based upon the polymer, of the organic solvent, and said organic solvent being selected from hydrocarbons and halogenated hydrocarbons and drying the mat thus treated to remove water and organic solvent, thereby causing the polymer particles to coalesce firmly with one another and adhere to the glass fiber mat, and molding the thus contained material at 110* to 200*C. and under a pressure of 5 to 100 kg/cm2.
Claim 5
Independent Claim
170 words
A method of producing moldable reinforced thermoplastic sheet material from vinyl chloride polymer having poor adhesive property to reinforcing glass fiber and to itself, which comprises impregnating a reinforcing glass fiber mat having glass fiber longer than one-half inch with an oil-in-water emulsion of vinyl chloride polymer resin particles containing an organic solvent capable of partially swelling the resin particles until the impregnated polymer content reaches to 60 to 90% by weight of the sheet material to be produced, said emulsion containing over about 30% by weight based upon the emulsion, of the polymer resin and from 5 to 30% by weight based upon the polymer, of the organic solvent, and said organic solvent being selected from hydrocarbons and halogenated hydrocarbons and drying the mat thus treated to remove water and organic solvent, thereby causing the polymer particles to coalesce firmly with one another and adhere to the glass fiber mat, and molding the thus contained material at 110* to 200*C. and under a pressure of 5 to 100 kg/cm2.
Claim 6
Dependent Claim
26 words
The method as claimed in claim 3 in which vinyl chloride polymer is selected from the group consisting of polyvinyl chloride and copolymer of vinyl chloride.
Claim 7
Dependent Claim
16 words
The method as claimed in claim 3 in which the molding is carried out by roller-molding.
Claim 8
Dependent Claim
16 words
The method as claimed in claim 3 in which the molding is carried out by compression-molding.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |