US3968073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing fiber-glass reinforced plastics
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1973-09-04
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Granted: 1976-07-06
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Expires: 1993-09-04
Abstract
Abstract A process for the production of glass-fiber reinforced plastics by partially copolymerizing a mixture of (A) 35-95% by weight methyl methacrylate, (B) 65-5% by weight of a vinyl aromatic hydrocarbon, and 0.2-5.0% by weight, based on the sum of (A) and (B) of a polymerizable compound containing two or more ethylenically unsaturated groups, discontinuing the partial copolymerization before gelation of said mixture has occurred, impregnating glass fibers with the resultant partially polymerized mixture and then curing the impregnated mixture.
Inventors
- 👤 Junji Hara
- 👤 Shigenori Togami
- 👤 Masami Tsuruta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:46
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/0405; C08J5/043; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2926; Y10T442/2992
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A process for the production of glass-fiber reinforced plastics, which process comprises the steps of partially copolymerizing a mixture consisting essentially of (A) 35-95% by weight methyl methacrylate, (B) 65-5% by weight of a vinyl aromatic hydrocarbon and (C) 0.2-5.0% by weight, based on the sum of said (A) and (B), of a polymerizable compound containing two or more ethylenically unsaturated groups, discontinuing the partial copolymerization before gelation of said mixture has taken place, impregnating glass fibers with the resultant partially polymerized mixture and curing the impregnated mixture.
Claim 2
Dependent Claim
88 words
A process for the production of glass-fiber reinforced plastics, which process comprises the steps of partially copolymerizing a mixture consisting essentially of (A) 35-95% by weight methyl methacrylate, (B) 65-5% by weight of a vinyl aromatic hydrocarbon and (C) 0.2-5.0% by weight, based on the sum of said (A) and (B), of a polymerizable compound containing two or more ethylenically unsaturated groups, discontinuing the partial copolymerization before gelation of said mixture has taken place, impregnating glass fibers with the resultant partially polymerized mixture and curing the impregnated mixture.
Claim 3
Dependent Claim
26 words
The process according to claim 1 wherein said vinyl aromatic hydrocarbon has a hydrocarbon structure wherein one vinyl group is directly bound to the aromatic ring.
Claim 4
Dependent Claim
24 words
The process according to claim 1 wherein said polymerizable compound containing two or more ethylenically unsaturated groups is an acrylic, methacrylic or divinylbenzene compound.
Claim 5
Dependent Claim
20 words
The process according to claim 1 wherein a polymerization initiator is added to said mixture of (A), (B) and (C).
Claim 6
Dependent Claim
29 words
The process according to claim 1 wherein the degree of partial polymerization is from 5 to 50% by weight based on the sum of said (A), (B) and (C).
Claim 7
Dependent Claim
22 words
The process according to claim 1 wherein a polymerization inhibitor is added to said partially polymerized mixture to discontinue said partial copolymerization.
Claim 8
Dependent Claim
23 words
The process according to claim 1 wherein the final cure is conducted in the presence of a polymerization initiator as a curing agent.
Claim 9
Dependent Claim
21 words
The process according to claim 1 wherein the final cure is conducted at a temperature of from room temperature to 120°C.
Claim 10
Dependent Claim
12 words
A glass-fiber reinforced plastic produced according to the process of claim 1.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |