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
1997-09-30
2000-08-15
Merriam, Andrew E. C.
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...
208314, 208322, 208309, 585319, 585804, C07C 710, C08L 2100
Patent
active
061038083
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a high aromatic oil preferably used for various rubber products, such as tires, rubber vibration insulators and fenders, printing inks and writing inks, and a rubber composition and an oil extended synthetic rubber using this high aromatic oil, specifically to such an improved high aromatic oil that the product performances thereof are compatible with an environment, and a rubber composition and an oil extended synthetic rubber using said high aromatic oil.
BACKGROUND ART
In general, paraffinic and naphthenic oils and high aromatic oils have so far been used as a softening agent for a rubber composition and as an extender oil for a synthetic rubber, and they have been used properly depending on the uses thereof. In particular, high aromatic oils have preferably been used as a softening agent for a rubber composition and as an extender oil for a synthetic rubber because of the following reasons (1) to (4): performance (high heat generating property) to a rubber composition, synthetic rubber, contained in a rubber composition, is the best, workability of a rubber composition, and
It has been advised, however, in PROPOSITION-65 enforcement in 1988 and a series of EU instructions started in 1989 that the high aromatic oils have a possibility to be a carcinogen because of polycyclic aromatic compounds [hereinafter, called a DMSO extract or PCA (polycyclic aromatic compounds) contained as components in the high aromatic oils, and therefore a high aromatic oil having no problem from the viewpoint of safety and hygiene as well as the characteristics (1) to (4) described above has been desired.
Following the series of regulations described above, in particular, the EU instructions, several proposals have so far been made from the viewpoint of a rubber composition. At present, however, any high aromatic oils which satisfy the three required characteristics described above and concurrently are adequate from the safety and hygiene point of view have not yet been proposed, much less rubber compositions or oil extended synthetic rubbers using said high aromatic oil.
A synthetic rubber obtained by using, as an aromatic monomer, a high aromatic lubricant which has a viscosity of 32 to 50 cst and which contains an aromatic component of 30 to less than 55% by weight and a saturated hydrocarbon component of 40 to 65% by weight, both of which are measured by Clay-Gel method (ASTM D 2007), and a polycyclic aromatic compound (PCA) of less than 3% by weight measured according to IP (The Institute of Petroleum) 346 method (PCA standard test) which is a method of extracting oil into dimethylsulfoxide as a means of determining polycyclic aromatic compound content, in particular, a rubber composition obtained by using the above lubricant for SBR in a proportion of 10 to 25% by weight based on the whole weight of the rubber composition has been proposed in, for example, Japanese Patent Application Disclosure No. Hei 6-505524 [British Patent (GB) 2252978, U.S. Pat. No. 5,504,135 and European Patent (EP) 575400].
The viscosity of the high aromatic oil, however, does not have a relation to the characteristic of providing either the high loss performance or the affinity with rubber among the characteristics required to the performances of the high aromatic oils described above and is not univocally related as well to the softening characteristic. In addition, there is the problem that the high aromatic oil can not stand the use as an alternative for conventional high aromatic oils, because the aromatic component falling within the above range, measured by the Clay-Gel method, does not provide the sufficiently high loss performance and the saturated hydrocarbon component falling within the above range does not provide as well the sufficient affinity with rubber.
Further, a method for solving a inferior high loss performance of a high aromatic oil containing less polycyclic aromatic compound (PCA) by making use of an cumaron-indene resin is proposed in West Germany Patent (DE) 3938620 [E
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patent: 5034119 (1991-07-01), Blackburn et al.
patent: 5242579 (1993-09-01), Mead et al.
patent: 5336840 (1994-08-01), Forte
patent: 5504135 (1996-04-01), Ardrizzi et al.
APS Search "IP 346", Mar. 8, 1999.
Bridgestone Corporation
Merriam Andrew E. C.
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