Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-10-13
1994-03-01
Seccuro, Jr., Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 93, 525932, C08L 5302, C08L 2514
Patent
active
052908623
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
It is known in the art that some physical properties of styrenic or acrylic type polymers may be improved by alloying them with one or more additional polymers. In some cases, the resulting mixture can have improved mechanical properties, such as improved impact strength or toughness.
Chemical Abstracts 109:171278v [Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.) 1988, 29(2), 180-1] discloses that physical blends of block SBR (styrene content: 75.2 weight percent) and a copolymer of methyl methacrylate and styrene are partially compatible. The morphological and mechanical properties of the blend are strongly dependent on the molding/mixing process used to produce the blend. The SBR could only be toughened when the ideal morphology of the blend was obtained.
Chemical Abstracts 106:85901z [JP 61/200,151] discloses thermoplastic compositions comprising from 5 to 95 weight percent of a block copolymer and from 95 to 5 weight percent of a thermoplastic polymer (e.g. ABS). The block copolymer is derived from coupling an aromatic vinyl polymer block with an aromatic vinyl monomer-conjugated diene copolymer block. The subject thermoplastic compositions apparently have improved impact strength.
Chemical Abstracts 112:8285y [JP 61/291,610] discloses the use of "impact modifiers" for thermoplastic polymers. The modifiers are basically similar to the block copolymer disclosed by Chemical Abstracts 106:85901z.
Chemical Abstracts 99:196070j [JP 58/122,954] discloses improvement of anisotropy of a styrene hydrocarbon-conjugated diene block copolymer by blending it with a styrene-methacrylic ester copolymer. Such a blend, when extruded to form a molded plate, apparently possesses superior physical properties.
Chemical Abstracts 111:8522c [JP 01/45614] discloses high-impact styrene polymer compositions comprises a major amount of a styrene (50 to 90 weight percent)-conjugated diene (50 to 10 weight percent) block copolymer and a minor amount of a styrene-based polymer (e.g. styrene-methyl methacrylate copolymer).
It would be desirable to have a composition which possesses a combination of improved properties, including improved impact strength. Typically the alloys of the present invention should have a notched Izod impact strength of greater than about 0.5, preferably greater than 1.0 ft.lb./in. In a particularly perferred aspect of the present invention, the alloys may have a haze of less than 10, most preferably less than 5.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide a novel polymer alloy.
Accordingly, in one of its aspects, the present invention provides a polymer alloy comprising:
(i) from 30 to 82 weight percent of a brittle polymer;
(ii) from 3 to 50 weight percent of a rubbery polymer; and
(iii) from 15 to 67 weight percent of a ductile polymer provided that the ductile polymer and the rubbery polymer are at least compatible.
BEST MODE FOR CARRYING OUT THE INVENTION
As used in this specification:
"brittle" means a polymer having an elongation at break up to 15%, preferably less than 10%, as measured by ASTM D-638;
"ductile" means a polymer having an elongation at break greater that 15%, as measured by ASTM D-638;
"rubbery" means a natural or synthetic polymer which, at room temperature can be stretched to at least twice its original length, and upon immediate release of the stress, will return to approximate original length;
"compatible" means two or more polymers which have good interfacial adhesion (for example a blend of the polymers exhibits physical properties approximate those expected from the rule of mixtures); and
"miscible" means two or more polymers which, when blended, remains clear, especially if the refractive indices of the polymers do not match.
The brittle polymer used in the present polymer alloy may be selected from the group of polymers consisting of polymers comprising:
(i) from 90 to 30, preferably from 80 to 40, most preferably from 75 to 55, weight percent of one or more C.sub.8-12 vinyl aromatic monomers which are unsubstituted or sub
REFERENCES:
patent: 3906057 (1975-09-01), Durst
patent: 3906058 (1975-09-01), Durst
patent: 3907931 (1975-09-01), Durst
patent: 4737556 (1988-04-01), Itoh et al.
Chemical Abstracts 112(2):8285y, Toyama et al.
Chemical Abstracts 111 (2):8522c, Yamaoka et al.
Chemical Abstracts 109(20):171278v, Yamaoka et al.
Chemical Abstracts 106(12):85901z, Honma et al.
Chemical Abstracts 99(24):196070j, Asahi Chemical Industry Co., Ltd.
Novacor Chemicals (International) S.A.
Seccuro, Jr. Carman J.
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