Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2002-08-29
2004-08-24
Robertson, Jeffrey B. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S103000, C525S106000, C525S476000, C525S479000, C528S025000, C528S026000, C528S029000, C528S031000, C528S032000
Reexamination Certificate
active
06780934
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a room temperature-setting composition, having an excellent curing property and being capable of showing an adequate strength property in a short period of time.
BACKGROUND ART
A polyoxyalkylene polymer having hydrolyzable silicon groups at the terminals is a polymer in a liquid state at room temperature, and its cured product maintains flexibility at a relatively low temperature. Therefore, the polymer has properties suitable for e.g. a sealant, an adhesive or a coating composition.
Such a polymer may, for example, be a polymer having hydrolyzable silicon groups at the terminals, as disclosed in JP-A-3-72527, JP-A-3-47825, JP-B-58-10418 or JP-B-58-10430.
JP-A-3-72527 and JP-A-3-47825 disclose a polymer having hydrolyzable silicon groups formed by bonding two hydrolyzable groups to a silicon compound. Such a polymer is excellent in elongation or flexibility, but poor in curing property. There were problems that such a polymer was poor in internal curing property particularly under a low temperature condition, and a cured product capable of showing an adequate strength property in a short period of time could not be obtained.
Further, JP-B-58-10418 and JP-B-58-10430 disclose a polymer having a relatively low molecular weight of at most 6000, which is a polymer having hydrolyzable silicon groups formed by bonding three hydrolyzable groups to a silicon atom. Such a polymer is insufficient in elongation or flexibility and poor in curing property. There were problems that such a polymer was poor in internal curing property particularly under a low temperature condition, and a cured product capable of showing an adequate strength property in a short period of time could not be obtained.
Further, such a polymer generally has a drawback that it is poor in bonding property. Therefore, it was difficult to use the polymer solely particularly for e.g. an elastic adhesive which requires bonding strength. JP-B-2-35793 proposes a method in which both an acrylic polymer and a polymer having hydrolyzable silicon groups made by bonding two hydrolyzable groups to a silicon atom are used, in order to improve the strength. However, the polymer composition obtained by this method has drawbacks that it has a low curing property, and it takes a long period of time for bonding.
DISCLOSURE OF INVENTION
The present inventors have conducted extensive researches on a polymer having hydrolyzable silicon groups. As a result, a composition has been found, wherein flexibility or work efficiency does not significantly deteriorate, and internal curing property of the cured product improves, whereby the present invention has been accomplished. Further, a composition has been found which gives a cured product wherein the curing property is excellent so that an adequate bonding property can be obtained in a short period of time, particularly the time for bonding is short, and bonding property to various materials is excellent, whereby the present invention has been accomplished.
Namely, the present invention provides a room temperature-setting composition containing a polyoxyalkylene polymer (A) having a molecular weight of from 8000 to 50000 and having hydrolyzable silicon groups of the following formula (1), which comprises, as an essential component, the polyoxyalkylene polymer having a molecular weight of from 8000 to 50000 and having hydrolyzable silicon groups of the formula (1) wherein a is 3; and a room temperature-setting composition containing a polyoxyalkylene polymer (A) having a molecular weight of from 8000 to 50000 and having hydrolyzable silicon groups of the formula (1), which comprises, as essential components, the polyoxyalkylene polymer having a molecular weight of from 8000 to 50000 and having hydrolyzable silicon groups of the formula (1) wherein a is 3, and a polymer (B) made by polymerization of a polymerizable unsaturated group-containing monomer (C).
—SiX
a
R
1
3−a
(1)
wherein R
1
is a C
1-20
substituted or unsubstituted monovalent organic group, X is a hydroxyl group or a hydrolyzable group, a is 1, 2 or 3, provided that when more than one R
1
exist, the plurality of R
1
may be the same or different, and when more than one X exist, the plurality of X may be the same or different.
BEST MODE FOR CARRYING OUT THE INVENTION
Polyoxvalkylene Polymer (A)
A polyoxyalkylene polymer (A) having hydrolyzable silicon groups of the formula (1) has been proposed in, for example, JP-A-3-47825, JP-A-3-72527 or JP-A-3-79627.
As mentioned hereinafter, the polyoxyalkylene polymer (A) is preferably produced by using a polyoxyalkylene polymer having functional groups as a material, and optionally introducing hydrolyzable silicon groups to the terminals by means of organic groups.
As the material polyoxyalkylene polymer, the hydroxyl group terminated one made by reacting e.g. monoepoxide with an initiator in the presence of a catalyst, is preferred.
As the initiator, a hydroxy compound having at least one hydroxyl group may, for example, be used. As the monoepoxide, ethylene oxide, propylene oxide, butylene oxide or hexylene oxide may, for example, be mentioned. Tetrahydrofuran may also be used. As the catalyst, an alkali metal catalyst such as a potassium compound or a cesium compound, a double metal cyanide complex catalyst, or a metal porphyrin catalyst may, for example, be mentioned.
In the present invention, as the material polyoxyalkylene polymer, one of high molecular weight of from 8000 to 50000 is used. Therefore, a polyoxyalkylene polymer made by multiplying by reacting a polyhalogen compound such as methylene chloride with a polyoxyalkylene polymer having a relatively low molecular weight which is made by using e.g. an alkali catalyst; or a polyoxyalkylene polymer made by using a double metal cyanide complex catalyst, can be used.
Further, in the present invention, as the material polyoxyalkylene polymer, it is preferred to use one having a molecular weight of from 8000 to 50000 and a M
w
/M
n
of at most 1.7. The M
w
/M
n
is preferably at most 1.6, and particularly preferably at most 1.5.
The polyoxyalkylene polymer (A) of the present invention is preferably a polymer made by using, as a material, a polyoxyalkylene polymer having a M
w
/M
n
of at most 1.7 which is made by polymerizing an alkylene oxide with an initiator, followed by modifying the terminals.
The polyoxyalkylene polymer made by using a double metal cyanide complex catalyst has a narrow molecular weight distribution (i.e. the value of the M
w
/M
n
is small) as compared with a case where an alkali catalyst is used or multiplying is carried out, and when the composition made of the polyoxyalkylene polymer is cured, good curing property can be obtained. Therefore, it is particularly preferred to use the polyoxyalkylene polymer.
Therefore, the polyoxyalkylene polymer (A) of the present invention is particularly preferably the polymer made by using, as the material, a polyoxyalkylene polymer which is made by polymerizing an alkylene oxide with an initiator in the presence of a double metal cyanide complex as a catalyst, followed by modifying the terminals.
The polyoxyalkylene polymer (A) is most preferably a polymer made by using, as the material, a polyoxyalkylene polymer having a M
w
/M
n
of at most 1.7, which is made by polymerizing an alkylene oxide with an initiator in the presence of a double metal cyanide complex as a catalyst, followed by modifying the terminals.
As the double metal cyanide complex, a complex having zinc hexacyanocobaltate as the main component, is preferred. And as the double metal cyanide complex, an ether and/or an alcohol complex is preferred. The composition may be substantially the same as one disclosed in JP-B-46-27250. As the ether, ethylene glycol dimethyl ether (glyme) or diethylene glycol dimethyl ether (diglyme) is preferred, and the glyme is particularly preferred in view of handling efficiency during production of the complex. As the alcohol, t-butanol is preferred, which is disclosed in, for example, JP-A-4-145123.
The
Doi Takao
Matsumoto Tomoko
Onoguchi Tatsuo
Tsuruoka Kaori
Watabe Takashi
Asahi Glass Company Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Robertson Jeffrey B.
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