Patent US3773709A successfully refreshed from Google Patents.
US3773709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced butadiene-styrene co-polymers
Assignee: Bridgestone Firestone Inc
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Filing: 1972-05-17
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Granted: 1973-11-20
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Expires: 1992-05-17
Abstract
Abstract A new sheet molding compound (SMC) comprises a calendered sheet of a high-viscosity, high-vinyl butadiene-styrene copolymer containing a peroxide compound equivalent in amount to 0.5-8 percent by weight of dicumyl peroxide. This sheet molding compound can comprise one calendered sheet containing fiberglass or other fibrous reinforcement, or if desired, may comprise two or more such sheets with or without a layer of fiberglass or other fibrous reinforcement between adjacent sheets. Such calendered sheets or composites are used in a one-step singlecomponent system for compression molding with improved results in handling and in ultimate properties as compared to present sheet molding compounds.
Inventors
- 👤 S Boutsicaris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:39
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; B; B29; B29C; B29C70/00; B29C70/003; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J5/249; B29K; B29K2309/00; B29K2309/08; C08J2309/00; Y; Y10; Y10S; Y10S264/00; Y10S264/53; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/24995
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
15 words
The sheet molding compound of claim 1 in which said alkenyl aryl comonomer is styrene.
Claim 2
Dependent Claim
36 words
The sheet molding compound of claim 2 in which said fillEr is selected from the class consisting of glass fiber, asbestos fiber, cellulosic fiber. alumina, mica, feldspar, talc, silica, clay, powdered metal, carbon black and graphite.
Claim 3
Dependent Claim
43 words
The sheet molding compound of claim 2 in which there are at least two of said calendered sheets and at least 10 percent by weight of said glass fibers based on total weight of sheet molding compound is interposed between adjacent calendered sheets.
Claim 4
Dependent Claim
19 words
The sheet molding compound of claim 4 in which said interposed glass fibers are impregnated with a thermosettable resin.
Claim 5
Dependent Claim
39 words
The sheet molding compound of claim 5 in which said thermosetting resin is a butadiene-styrene copolymer containing 55-65 percent by weight of butadiene and said butadiene has at least 80 percent of its repeating units in the pendent-vinyl structure.
Claim 6
Dependent Claim
26 words
The sheet molding compound of claim 4 in which at least 80 percent of the butadiene repeating units in said butadiene-styrene copolymer have a pendent-vinyl structure.
Claim 7
Dependent Claim
20 words
The sheet molding compound of claim 7 in which said butadiene-styrene copolymer has 35-45 percent styrene and 55-65 percent butadiene.
Claim 8
Dependent Claim
21 words
The sheet molding compound of claim 1 in which said butadiene-styrene copolymer has 35-45 percent styrene and 55-65 percent butadiene therein.
Claim 9
Dependent Claim
27 words
The sheet molding compound of claim 9 in which at least 80 percent of the butadiene repeating units in said butadiene-styrene copolymer have the pendent vinyl structure.
Claim 10
Dependent Claim
17 words
The sheet molding compound of claim 10 which has 25-35 percent by weight of glass fibers therein.
Claim 11
Dependent Claim
17 words
The sheet molding compound of claim 1 which has 25-35 percent by weight of glass fibers therein.
Claim 12
Dependent Claim
17 words
The sheet molding compound of claim 12 which has 22-28 percent by weight of said copolymer therein.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |