Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1998-08-26
2000-10-31
Moore, Margaret G.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
525100, 525105, 525106, 524506, 524269, 524496, 524495, C08G 7704
Patent
active
061404500
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a modified polysiloxane and to a rubber composition and a tire tread rubber composition using the same. More particularly, it relates to a modified polysiloxane which is free from migration from rubber due to the formulation of the modified polysiloxane in a rubber composition and, as compared with ordinary plasticizers, gives a low modulus, improves the processability of a silica formulated rubber, reduces the temperature dependency of the hardness, is superior in the tans balance, and enables an improvement in the grip on ice/snow, abrasion resistance, etc. and to a rubber composition and a tire tread rubber composition using the same.
Further, the present invention relates to a non-migratory reactive plasticizer used in a rubber or a resin composition, more particularly to a siloxane-based reactive plasticizer suitable for use in a rubber or a resin composition containing silica, clay, mica, kaolin, active clay, or other silicon-containing fillers.
BACKGROUND ART
In general, plasticizers are used for many products comprising rubber compositions. These migrate with the passage of time, and therefore, there has been the problem of changes in the performance of the product with the elapse of time. To deal with this problem, it is known to add liquid IR or BR, but these are not necessarily covulcanized and considerably migrate.
Further, since these are diene polymers, the heat aging resistance etc. deteriorates.
Further, there is the technique of adding a plasticizer for the purpose of reducing the hardness of the rubber at a low temperature (see Japanese Unexamined Patent Publication (Kokai) No. 6-116443), but the plasticizer per se has a high volatility and migration property, and therefore, there is a large change with time and the performance on ice is considerably decreased. Further, if a large amount of the plasticizer is formulated, there is a problem that the abrasion resistance is also decreased.
Further, there is the technique of formulating a butyl rubber or a halogenated butyl rubber into a tire tread rubber composition so as to improve the grip performance on ice (see Japanese Unexamined Patent Publication (Kokai) No. 60-213506 and Japanese Unexamined Patent Publication (Kokai) No. 5-001177), but there is a defect that the abrasion resistance is conversely decreased.
Further, many plasticizers are used for various types of rubber and resins. Among these, since ester-based plasticizers are in particular superior in compatibility with rubber and resins, they have been used conventionally in the past. However, these ester compounds do not react with rubber or resins or with fillers and migrate to the outside with the elapse of time, and therefore, there was the problem that they caused the physical properties of the rubber or resins to fall with the passage of time. Further, reactive plasticizers for epoxy resins are well known, but almost no reactive plasticizers for other resins or rubber are known.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a specific polysiloxane modified with a liquid polymer which, when formulated in most rubber compositions, particularly rubber compositions containing carbon black and/or silica, does not migrate and also gives a cured rubber which is flexible even at low temperatures and improves the processability when unvulcanized.
Another object of the present invention is to provide a tire tread rubber composition which, by formulating a modified polysiloxane in a tire tread rubber composition, can maintain a low modulus, can reduce the temperature dependency of the hardness, is superior in the tans balance, and is improved in the gripping force on ice/snow, the abrasion resistance, etc.
Still another object of the present invention is to provide a reactive plasticizer for preventing deterioration in the physical properties of a rubber or a resin composition with the passage of time.
According to the present invention, as the specific polysiloxane modified with a liqui
REFERENCES:
patent: 4904732 (1990-02-01), Iwahara et al.
patent: 5666245 (1997-09-01), Kennedy et al.
patent: 5777059 (1998-07-01), Datz-Siegel et al.
Patent Abstract of Japanese Pub. No. 05043696, Reactive Organopolysiloxane, Shoji Hiroaki, Nippon Unicar Co. Ltd., published Feb. 23, 1993.
Patent Abstract of Japanese Pub. No. 03047841, Alkoxysilylalkyl Group-Containing Organopolysiloxane, Ona Isao, Toray Dow Corning Silicone Co. Ltd., published Feb. 28, 1991.
Patent Abstract of Japanese Pub. No. 62225533, Organopolysiloxane Modified with Alkoxysilylalkyl Polyoxyalkylene, Taki Yoichiro, Toray Silicone Co. Ltd., published Oct. 3, 1987.
Patent Abstract of Japanese Pub. No. 10001543, Acyloxypolysiloxane Derivative and Its Production, Hosoda Hiroyuki, Yokohama Rubber Co. Ltd.: The, published Jan. 6, 1998.
Ishikawa Kazunori
Yatsuyanagi Fumito
Moore Margaret G.
The Yokohama Rubber Co. Ltd.
LandOfFree
Modified polysiloxanes, rubber compositions and tire tread rubbe does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modified polysiloxanes, rubber compositions and tire tread rubbe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified polysiloxanes, rubber compositions and tire tread rubbe will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2053020