Patent US3725332A successfully refreshed from Google Patents.
US3725332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylonitrile-butadiene-styrene compositions
Assignee: Dart Industries Inc
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Filing: 1970-12-15
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Granted: 1973-04-03
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Expires: 1990-12-15
Abstract
Abstract Compositions which contain a blend of: A. A FIRST GRAFT COPOLYMER COMPOSITION DERIVED FROM THE GRAFT COPOLYMERIZATION OF A DIENE-BASED RUBBER WITH, FOR EXAMPLE, ACRYLONITRILE AND STYRENE, WHERE THE RUBBER HAS A MAJORITY OF ITS PARTICLES IN THE SIZE RANGE OF ABOUT 0.8 TO ABOUT 10 MICRON, B. A SECOND GRAFT COPOLYMER COMPOSITION WHICH HAS A MAJORITY OF ITS PARTICLES IN THE SIZE RANGE OF 0.005 TO ABOUT 0.6 MICRON, AND C. 1 TO 10 PARTS BY WEIGHT OF AN EPOXIDIZED SOYBEAN OIL OR A MONO- OR DISUBSTITUTED PHTHALIC ACID ESTER, E.G., DIOCTYL PHTHALATE, HAVE BEEN BEEN FOUND TO HAVE MUCH HIGHER Izod impact strengths at a given melt flow range than similar blends that do not contain the epoxidized soybean oil or phthalic acid ester for the same total rubber concentration in the blend.
Inventors
- 👤 F Carrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:47
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12; C08F; C08F279/00; C08F279/02; C08F279/04; C08L; C08L55/00; C08L55/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
The composition of claim 1 wherein said additive is a di-substituted phthalic acid ester having said formula and wherein R1 and R2 of said formula are both alkyls having eight carbon atoms.
Claim 2
Dependent Claim
15 words
The composition of claim 1 containing 5 to 100 parts by weight of styrene-acrylonitrile copolymer.
Claim 3
Dependent Claim
82 words
The composition of claim 1 wherein said diene-based rubber is a linear polybutadiene having a cis-1,4 content of at least 30 and up to about 98 weight percent and the amount of said linear polybutadiene ranges from about 3 to 15 percent by weight of said first graft copolymer and wherein said diene latex-based rubber is a polybutadiene derived from latex polymerization and the amount of said polybutadiene ranges from about 10 to 60 percent by weight of said second graft copolymer.
Claim 4
Dependent Claim
124 words
A composition of matter comprising a blend of: a. 25 to 95 parts by weight of a first graft copolymer composition derived from prepolymerizing a mono-meric mixture of an ethylenically unsaturated nitrile and vinyl aromatic hydrocarbon containing a diene rubber dissolved therein to convert about 10 to 50 percent of the monomers to polymers and substantially completely polymerizing the resulting prepolymer in a subsequent polymerization step, b. 75 to 5 parts by weight of a second graft copolymer composition derived from graft polymerizing a monomeric mixture of an ethylenically unsaturated nitrile and a vinyl aromatic hydrocarbon onto an unsaturated latex-based rubber in an aqueous emulsion, and c. 1 to 10 parts by weight of a mono- or disubstituted phthalic acid ester having the formula:
Claim 5
Dependent Claim
32 words
The composition of claim 5 wherein said additive is ad disubstituted phthalic acid ester having said formula and wherein R1 and R2 of said formula are both alkyls having 8 carbon atoms.
Claim 6
Dependent Claim
86 words
The composition of claim 5 wherein said diene rubber is a linear polybutadiene having a cis-1,4 content of at least 30 and up to about 98 weight percent, and said unsaturated latex-based rubber is polybutadiene derived from latex polymerization, wherein the amount of said linear polybutadiene ranges from about 5 to 15 percent by weight of said first graft copolymer and said polybutadiene ranges from about 20 to 60 percent by weight of said second graft copolymer and wherein said monomeric mixture comprises acrylonitrile and styrene.
Claim 7
Dependent Claim
44 words
A process for preparing a high impact strength composition which comprises: a. adding to a prepolymerization zone in an amount such that said high impact composition contains 1 to 10 percent by weight of a mono- or disubstituted phthalic acid ester having the formula:
Claim 8
Dependent Claim
43 words
The process of claim 8 wherein said monomeric mixture comprises acrylonitrile and styrene, and wherein said diene rubber is a linear polybutadiene having a cis-1,4 content of at least 30 up to about 98 weight percent and said unsaturated latex-based rubber is polybutadiene.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |