Patent US2261192A successfully refreshed from Google Patents.
US3975321A
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Sound reproduction compositions
Assignee: PACIFIC WESTERN RESIN Co
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Filing: 1974-05-13
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Granted: 1976-08-17
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Expires: 1994-05-13
Abstract
Abstract Novel sound reproduction molding compositions of good processing qualities are disclosed, based on copolymer of vinyl chloride and propylene. Records obtained therefrom, have good audio qualities and resistance to impact, thermal warpage and water blistering. Because of their high heat stability, formulations based on the vinyl chloride-propylene (VC/P) copolymers can be employed in making sound records not only by the usual compression molding techniques, but also by injection molding.
Inventors
- 👤 Charles A. Heiberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:45
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; G; G11; G11B; G11B3/00; G11B3/68; G11B3/70; G11B3/705
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
63 words
A phonograph record comprising a disc formed from a synthetic resin molding composition comprising as the resin therein a copolymer of vinyl chloride with propylene, said copolymer containing from about 4 to 8% by weight of propylene, and said copolymer having an intrinsic viscosity from about 0.45 to 0.7 dl./g. and a melt flow rate from about 50 to 500 dg./min. at 190°C.
Claim 2
Dependent Claim
63 words
A phonograph record comprising a disc formed from a synthetic resin molding composition comprising as the resin therein a copolymer of vinyl chloride with propylene, said copolymer containing from about 4 to 8% by weight of propylene, and said copolymer having an intrinsic viscosity from about 0.45 to 0.7 dl./g. and a melt flow rate from about 50 to 500 dg./min. at 190°C.
Claim 3
Dependent Claim
31 words
A phonograph record as defined in claim 1 wherein said molding composition further contains flow additive in an amount of up to about 10% by weight of resin in said composition.
Claim 4
Dependent Claim
27 words
A phonograph record as defined in claim 2, wherein said flow additive is selected from the group consisting of polyalphamethylstyrene, a polyacrylate, a polymethacrylate, and methacrylate-acrylate-styrene interpolymers.
Claim 5
Dependent Claim
20 words
A phonograph record as defined in claim 1 wherein said molding composition further comprises at least one heat stabilizer compound.
Claim 6
Dependent Claim
17 words
A phonograph record as defined in claim 4 wherein said heat stabilizer compound comprises a lead compound.
Claim 7
Dependent Claim
20 words
A phonograph record as defined in claim 4 wherein said heat stabilizer compound is a composition comprising barium and lead.
Claim 8
Dependent Claim
18 words
A phonograph record as defined in claim 4 wherein said heat stabilizer compound is a non-toxic metallo-organic compound.
Claim 9
Dependent Claim
26 words
A phonograph record as defined in claim 7 wherein said metallo-organic compound is at least one selected from the group consisting of calcium and zinc soaps.
Claim 10
Dependent Claim
19 words
A phonographic record as defined in claim 4 wherein said heat stabilizer compound is one comprising barium and cadmium.
Claim 11
Dependent Claim
48 words
A phonograph record formed from a composition comprising vinyl chloride-propylene copolymer, said copolymer containing about 4% by weight propylene as copolymerizate, and said copolymer having an intrinsic viscosity from about 0.53 to 0.58 dl./g. and a melt flow rate of from about 70 to 150 dg./min. at 190°C.
Claim 12
Dependent Claim
48 words
A phonograph record formed from a composition comprising vinyl chloride-propylene copolymer, said copolymer containing about 4% by weight propylene as copolymerizate, and said copolymer having an intrinsic viscosity from about 0.53 to 0.58 dl./g. and a melt flow rate of from about 70 to 150 dg./min. at 190°C.
Claim 13
Dependent Claim
27 words
A phonograph record as defined in claim 10, wherein said composition further comprises polyalphamethylstyrene in an amount of up to about 10% by weight of the copolymer.
Claim 14
Dependent Claim
17 words
A phonograph record as defined in claim 10 wherein said composition further comprises a barium-lead heat stabilizer.
Claim 15
Dependent Claim
50 words
A phonograph record formed from a composition comprising vinyl chloride-propylene copolymer, said copolymer containing from about 7 to 8% by weight propylene as copolymerizate, and said copolymer having an intrinsic viscosity from about 0.53 to 0.6 dl./g. and a melt flow rate from about 100 to 300 dg./min. at 190°C.
Claim 16
Dependent Claim
50 words
A phonograph record formed from a composition comprising vinyl chloride-propylene copolymer, said copolymer containing from about 7 to 8% by weight propylene as copolymerizate, and said copolymer having an intrinsic viscosity from about 0.53 to 0.6 dl./g. and a melt flow rate from about 100 to 300 dg./min. at 190°C.
Claim 17
Dependent Claim
54 words
A quadriphonic sound record formed from a composition comprising a copolymer of vinyl chloride with propylene, said copolymer containing from about 4 to 8% by weight copolymerized propylene and said copolymer having an intrinsic viscosity from about 0.45 to 0.7 dl./g. and a melt flow rate from about 50 to 500 dg./min. at 190°C.
Claim 18
Dependent Claim
54 words
A quadriphonic sound record formed from a composition comprising a copolymer of vinyl chloride with propylene, said copolymer containing from about 4 to 8% by weight copolymerized propylene and said copolymer having an intrinsic viscosity from about 0.45 to 0.7 dl./g. and a melt flow rate from about 50 to 500 dg./min. at 190°C.
Claim 19
Dependent Claim
20 words
A quadriphonic record as defined in claim 14, wherein said composition further comprises epoxidized soya oil and barium-lead heat stabilizer.
References Cited (Backward Citations)
US3468858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |