Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
1999-10-25
2001-01-16
Moore, Margaret G. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S279000, C526S219000, C526S219200, C526S232100, C526S229000, C525S100000, C525S102000, C525S103000, C525S090000, C525S474000, C525S477000, C525S479000, C428S447000
Reexamination Certificate
active
06174977
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cold curable resin composition used in a process for imparting water repellency and oil repellency to a material to be coated and also relates to a base material coated with the resin composition.
2. Description of the Prior Art
In recent years, methods of reducing free energy of the surfaces of various base materials have been developed to impart various types of functionality. The fields concerned are diversified and there is a demand for base materials provided with the surface having de-staining, de-labeling, de-scribbling and de-snowing abilities and water-, oil- and ink-repellency. De-scribbling ability imparted to various materials′ surfaces such as building walls, telephone boxes, or subway trains is called
Anti
-
Graffiti
. A coating to such base materials+ surfaces to impart the
Anti
-
Graffiti Effect
to them may also be called
Anti
-
Graffiti Coating.
A polyorganosiloxane type paint is used as one of means for providing these functions. However, because resistance to an organic solvent is demanded of, particularly, such a surface-treating agent used with the intention of imparting de-scribbling ability, strict conditions are required and hence it cannot produce a long lasting, sufficient de-scribbling effect. The polyorganosiloxane type paint also produces phase separation on account of low compatibility, i.e., low miscibility between various resins and polyorganosiloxane. As a consequence, the polyorganosiloxane type paint poses the problems that it gives poor transparency to the coating and produces tacky feeling.
As the measures for solving this compatibility problem, the use of a graft or block copolymer of polyorganosiloxane and other components is known. For example, Japanese Patent Publication No.3-46026 discloses a curable composition comprising polyorganosiloxane having alkenyl group bound to silicon and organopolysiloxane having hydrogen directly bound to silicon, being curable in the presence of a catalyst by hydrosilylation reaction between the silicon-bound alkenyl group and the silicon-bound hydrogen. Japanese Patent Application Laid-Open No.2-298511 discloses a silicon type peeling agent comprising a block copolymer consisting of a polymer block having a glass transition point of 50° C. or more and a polyorganosiloxane block, a monomer containing an epoxy type functional group and an onium salt type curing catalyst. Japanese Patent Application Laid-Open No.6-228467 discloses a resin composition for de-staining paint, which comprises a block copolymer of an epoxy group-containing silicon resin and a carboxyl group-containing polyester resin, and is used as a moister-curing varnish obtained by allowing the unreacted epoxy group of the block copolymer to react with aminoalcoxysilane.
However, no resin composition having such advantageous properties as (a) rapid curability at normal or ambient temperature to develop a de-scribbling effect within a day and (b) long durability in use, which is the time also referred to as pot life in this field, has been found so far.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a curable resin composition which is cured rapidly at normal temperature to develop a de-scribbling effect within a day and has long durability in use and a base material coated with the resin composition.
To accomplish this and other objects, the cold curable resin composition of the present invention comprises a block copolymer of (a) a polyorganosiloxane portion and (b) a polymer portion having an epoxy group, a hydroxyl group and a hydrolytic silyl group. It is more preferable that the composition further comprises a polyfunctional amine compound. In this case, the ratio of the number of active hydrogen of amino groups contained in said polyfunctional amine compound to the number of said epoxy groups is preferably in a range between 0.8 and 1.25. Further in this case, said polyfunctional amine compound is preferably polyoxyalkylenepolyamine having a molecular weight of 1,000 or less.
The block copolymer is preferably a polymer in which (a) a polydimethyl siloxane portion and (b) a copolymer portion comprising an &agr;, &bgr;-ethylenic unsaturated monomer having an epoxy group, an &agr;, &bgr;-ethylenic unsaturated monomer having a hydroxyl group, an &agr;, &bgr;-ethylenic unsaturated monomer having a hydrolytic silyl group and other &agr;, &bgr;-ethylenic unsaturated monomer are bound with each other in the form of a block polymer. In this case, said composition preferably contains 10-50 parts by weight of said &agr;, &bgr;-ethylenic unsaturated monomer having an epoxy group, 1-10 parts by weight of said &agr;, &bgr;-ethylenic unsaturated monomer having a hydrolytic silyl group, 1-20 parts by weight of said &agr;, &bgr;-ethylenic unsaturated monomer having a hydroxyl group and 0.05-20 parts by weight of said polyorganosiloxane portion.
In the cold curable resin composition of the present invention, said block copolymer is preferably produced by copolymerizing an &agr;, &bgr;-ethylenic unsaturated monomer having an epoxy group, an &agr;, &bgr;-ethylenic unsaturated monomer having a hydroxyl group, an &agr;, &bgr;-ethylenic unsaturated monomer having a hydrolytic silyl group and other one or more &agr;, &bgr;-ethylenic unsaturated monomers in the presence of a polymer azo-type initiator represented by the following general formula and a radical polymerization initiator having a molecular weight of 1,000 or less:
wherein x represents an integer from 10 to 300 and n represents an integer from 1 to 20. In this case, said radical polymerization initiator having a molecular weight of 1,000 or less is preferably a compound selected from the group consisting of peroxides and azobis compounds.
In the cold curable resin composition of the present invention, it is further preferable that the composition further comprises a polyfunctional (metha)acrylate compound. More preferably, the polyfunctional (metha)acrylate compound has a molecular weight of 1,000 or less. It is also preferable that the polyfunctional (metha)acrylate compound is ditrimethylolpropane tetra(metha)acrylate. When the composition comprises a polyfunctional (metha)acrylate compound as above mentioned, the ratio of the number of active hydrogen of amino groups contained in said polyfunctional amine compound to the sum of the number of said epoxy groups and the number of acrylate groups of said polyfunctional (metha)acrylate compound is preferably in a range between 0.8 and 1.25.
In the cold curable resin composition of the present invention, it is also preferable that the composition further comprises a silane compound having an epoxy group or an amino group.
From another aspect of the present invention, a coated base material is further disclosed herein, whose surface is coated with the cold curable resin composition above described. Said base material to be coated may be the one selected from the group consisting of artificial stones, glass, plastic plates and plastic films. The coated base material is preferably used for de-staining exterior or interior of civil or construction materials. It may be more beneficial in these usage.
Furthermore, the present invention is especially effective if the base material to be coated is a transparent one. From this point of view, a coated transparent base material is further disclosed herein, whose one surface or both surfaces are coated with the cold curable resin composition above described, wherein said coated transparent base material transmits 99% of light with a wavelength of 660 nm. The coated, transparent base material is again preferably used for de-staining exterior or interior of civil or construction materials.
From another aspect of the present invention, a method for producing a cold curable resin composition is disclosed herein, said method comprises copolymerizing an &agr;, &bgr;-ethylenic unsaturated monomer having an epoxy group, an &agr;, &bgr;-ethylenic unsaturated monomer having a hydroxyl gro
Ariyoshi Yasushi
Suzuki Takehiro
Moore Margaret G.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Toyo Ink Mfg. Co. Ltd.
LandOfFree
Cold curable resin composition and base material coated with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cold curable resin composition and base material coated with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cold curable resin composition and base material coated with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2447936