Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1998-09-09
2000-04-25
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524474, 524527, 524571, 264302, 26433113, 26433116, 427375, 4273855, 4273881, 4273935, 427314, 427316, 427318, C08L 2706, C08L 902, C08K 501, B29C 4118, C09D12706
Patent
active
060545240
ABSTRACT:
This invention is based upon the unexpected discovery that aliphatic solvents and secondary plasticizers act to reduce the viscosity of plastisol compositions that contain a crosslinked nitrile rubber. It has been unexpectedly found that plastisol compositions having acceptable viscosities which contain more than 30 or even 40 percent crosslinked nitrile rubber can be made by incorporating an aliphatic solvent or an aliphatic plasticizer therein. This invention more specifically discloses a plastisol composition which is comprised of (i) polyvinyl chloride, (ii) optionally, from about 60 to about 100 parts by weight of a primary plasticizer per 100 parts by weight of the polyvinyl chloride, (iii) from about 1 to about 3 parts of a stabilizer per 100 parts by weight of the polyvinyl chloride, (iv) from about 2 to about 100 parts of an aliphatic solvent or a secondary plasticizer per 100 parts by weight of the polyvinyl chloride and (v) from about 20 to about 50 parts by weight of a powdered crosslinked nitrile rubber per 100 parts of the polyvinyl chloride, wherein the powdered crosslinked nitrile rubber is comprised of repeat units which are derived from (a) 1,3-butadiene, (b) acrylonitrile and (c) a crosslinking agent, wherein said powdered crosslinked nitrile rubber has a Mooney viscosity which is within the range of about 50 to about 120, a swelling index of less than about 20 percent, a mill shrinkage of less than about 30 percent, a gel content of greater than 80 percent and a particle size of no greater than about 250 microns.
REFERENCES:
patent: 5658969 (1997-08-01), Gerace
patent: 5686147 (1997-11-01), Nogoc
patent: 5739203 (1998-04-01), Ngoc
patent: 5840236 (1998-11-01), Ngoc
Breton Francois Jean-Marie
Ngoc Hung Dang
Rockhill Alvin T
Szekely Peter A.
The Goodyear Tire & Rubber Company
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