US3671607A
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Method for impact modification of ethylenically unsaturated nitrile polymers and polymer blends produced thereby
Assignee: Monsanto Co
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Filing: 1969-10-14
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Granted: 1972-06-20
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Expires: 1989-10-14
Abstract
Abstract A polyblend with good impact properties, good light stability, good heat stability, low water vapor transmission and low oxygen permeability has a polymerization graft component with a rubbery substrate and a composite superstrate. Initially, the rubbery substrate is grafted with a monomer mixture containing little or no nitrile monomer and generally comprised of monomers selected from the group consisting of monovinylidene aromatic hydrocarbon, alkyl esters of unsaturated carboxylic acids, unsaturated carboxylic acids, vinyl alkanoates and vinyl ethers. Thereafter, the resultant graft copolymer is admixed and grafted with a second monomer formulation containing at least 60 percent by weight of ethylenically unsaturated nitrile monomers. The resultant composite graft copolymer is then blended with a matrix of an ethylenically unsaturated nitrile polymer to provide the desired impact modified polymer blends.
Inventors
- 👤 Yoon Chai Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/003; C08F; C08F285/00; C08F291/00; C08F291/02; C08L33/00; C08L33/18; C08L33/20; Y; Y10; Y10S; Y10S525/00; Y10S525/902; Y10S525/932; Y10S525/942
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
28 words
The method as defined in claim 1 wherein said rubbery polymer substrate is a polymer of a rubber-forming diene monomer and 0-30 percent of an ethylenically unsaturated nitrile.
Claim 2
Dependent Claim
27 words
The method as defined in claim 1 wherein said rubbery polymer is a polymer of a rubber-forming diene monomer and 0-25 percent of a monovinylidene aromatic hydrocarbon.
Claim 3
Dependent Claim
24 words
The method as defined in claim 1 wherein said first-mentioned polymerizable monomer formulation contains a monovinylidene aromatic hydrocarbon monomer and an alkyl acrylate monomer.
Claim 4
Dependent Claim
59 words
The method as defined in claim 4 wherein said monovinylidene aromatic hydrocarbon is styrene and wherein said alkyl acrylate is butyl acrylate, said styrene monomer comprising 10-30 percent by weight of the monomer formulation, said butyl acrylate monomer comprising 80-50 percent by weight of the monomer formulation, and nitrile monomer comprising 0-20 percent by weight of the monomer formulation.
Claim 5
Dependent Claim
19 words
The method as defined in claim 1 wherein said second polymerizable monomer mixture consists at least principally of methacrylonitrile.
Claim 6
Dependent Claim
25 words
The method as defined in claim 6 wherein said second-mentioned polymerizable mixture contains 5-25 percent by weight styrene monomer and 95-75 percent by weight methacrylonitrile.
Claim 7
Dependent Claim
20 words
The method as defined in claim 1 wherein the rubbery polymer substrate has a particle size of about 0.2-0.8 micron.
Claim 8
Dependent Claim
25 words
The method as defined in claim 1 wherein the superstrate to substrate ratio of the combined polymers grafted onto the rubbery polymer substrate is 0.3-1.5:1.0.
Claim 9
Dependent Claim
35 words
The method as defined in claim 1 wherein said rubbery polymer substrate is a copolymer of butadiene and 10-30 percent of an ethylenically unsaturated nitrile and has an average particle size of about 0.2-0.8 micron.
Claim 10
Dependent Claim
33 words
The method as defined in claim 1 including the additional step of blending the composite graft copolymer with a matrix interpolymer of at least 60 percent by weight of ethylenically unsaturated nitrile monomer.
Claim 11
Dependent Claim
19 words
The method as defined in claim 11 wherein said matrix polymer is comprised at least principally of methacrylonitrile monomer.
Claim 12
Dependent Claim
53 words
The method as defined in claim 1 wherein said first-mentioned polymerizable monomer formulation and said second polymerizable monomer formulation are both produced as a part of a single, substantially continuous graft polymerization reaction in which there are introduced monomers during the course of the polymerization reaction to provide the different polymerizable monomer formulations.
Claim 13
Dependent Claim
116 words
A polymeric composition containing a composite graft copolymer having a substrate of a graftable rubbery polymer and a superstrate formed by two different polymers, one of said polymers being formed from a polymerizable monomer formulation consisting of at least 70 percent by weight of monomers selected from the group consisting of monovinylidene aromatic hydrocarbons, alkyl esters of unsaturated carboxylic acids, vinyl alkanoates, unsaturated carboxylic acids, vinyl ethers, and mixtures thereof, and the other of said polymers being a relatively polar shell formed from a polymerizable monomer formulation consisting of at least 60 percent by weight ethylenically unsaturated nitrile monomer, the total nitrile monomer content of said superstrate polymers being at least 60 percent by weight thereof.
Claim 14
Dependent Claim
40 words
The polymeric composition of claim 14 wherein there is additionally included a matrix polymer containing at least 60 percent by weight ethylenically unsaturated nitrile monomer component, said rubbery polymer substrate comprising 5-50 percent by weight of the total polymeric composition.
Claim 15
Dependent Claim
34 words
The polymeric composition of claim 14 wherein said first mentioned polymerizable formulation contains a methacrylonitrile monomer and an alkyl acrylate monomer and wherein said second polymerizable monomer formulation consists at least principally of methacrylonitrile.
Claim 16
Dependent Claim
49 words
The polymeric composition of claim 16 wherein there is additionally included a matrix polymer containing at least 60 percent by weight ethylenically unsaturated nitrile monomer component, said rubbery polymer substrate comprising 3-50 percent by weight of the total polymeric compoSition, said matrix polymer containing at least 50 percent methacrylonitrile.
Claim 17
Dependent Claim
54 words
The polymeric composition of claim 15 in the form of a molded container, said polymeric composition having oxygen permeability of less than 6.5 cc/100 sq. in. 24 hr. atmos. mil at 73* F. and water vapor transmission of less than 8.5 gms./24 hr. 100 sq. in. mil at 100* F. and 95 percent R.H.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |