Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1999-11-12
2001-09-11
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S086000, C524S102000, C524S236000, C524S500000, C525S477000, C528S017000
Reexamination Certificate
active
06288152
ABSTRACT:
FIELD OF THE INVENTION
The present invention is a room-temperature curable silicone rubber composition. In particular, it is a room-temperature curable silicone rubber composition that provides excellent bonding durability after being cured, so that it retains a high degree of bonding power even when it is used outdoors for a long period of time.
BACKGROUND OF THE INVENTION
Many room-temperature curable silicone rubber compositions are known that turn into silicone rubber after being cured at room temperature upon contact with the water in air. Among these are room-temperature curable silicone rubber compositions with the main constituents of polydiorganosiloxane and alkoxysilane that have alkoxysilyl groups on both ends of a molecular chain and that harden by releasing alcohol in the presence of an organo-titanium compound catalyst (also known as de-alcohol curable room-temperature curable silicone rubber compositions). These compositions find many applications as sealants for electric and electronic devices, bonding agents, and construction material sealants because of the absence of a noxious odor and their propensity not to corrode metals (see Japanese Patent Application No. 39-27643, Japanese Patent Application No. 55-43119, and Japanese Patent Application No. 62-252456). These types of room-temperature curable silicone rubber compositions, however, have a disadvantage in that their bonding capacity declines as a function of aging when the material is used outdoors for sealing or bonding glass for a long period of time. Therefore, these compositions are not completely satisfactory as construction material sealants, for example.
To solve the above problems, the inventors discovered that the addition of small amounts of a light stabilizer and/or a UV absorber to de-alcohol curable room-temperature curable silicone rubber compositions containing a specific polydiorganosiloxane as a main constituent solves the above problems,and consequently, have resulted in the present invention.
SUMMARY OF THE INVENTION
The present invention is a room temperature curable composition comprising:
(A) 100 parts by weight of a polydiorganosiloxane comprising
(A-1) 20 to 100 parts by weight of a first polydiorganosiloxane,
(A-2) 0 to 80 parts by weight of a second polydiorganosiloxane;
(B) 1 to 20 parts by weight of an alkoxysilane or an alkoxysilane partial hydrolysis condensate;
(C) 0.5 to 10 parts by weight of an organo-titanium compound;
(D) 0.01 to 5 parts by weight of an additive selected from light stabilizers and UV absorbers.
The purpose of the present invention is to provide a room-temperature curable silicone rubber composition that excels in bonding durability and that can retain its bonding power even when used outdoors for a long period of time.
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Adachi Hiroshi
Okabe Kazutoshi
Saruyama Toshio
Dawson Robert
Dow Corning Toray Silicone Co. Ltd.
Warren Jennifer S.
Zimmer Marc S.
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