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...
Reexamination Certificate
2001-08-27
2004-03-23
Yoon, Tae H. (Department: 1714)
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...
C524S506000, C524S588000
Reexamination Certificate
active
06710124
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO A MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
This invention relates to a water base coating material composition, and to a production process for making the composition. In particular, it relates to a water base coating material composition which will form a coating film of superior flat finish properties, and the process for producing it is highly efficient.
BACKGROUND OF THE INVENTION
Some water base coating material compositions for forming coating films that contain silicone particles and a flat finish, and processes for preparing some water base coating material compositions by adding an aqueous suspension of silicone particles to water base coating material compositions are described in U.S. Pat. No. 5,708,057 (Jan. 13, 1998), and in Japanese Unexamined Patent Application Publication No. Hei 11[1999]-140191). However, flat finishing properties of coating films of such water base coating material compositions have not been adequate.
BRIEF SUMMARY OF THE INVENTION
Therefore, it is the object of the invention to provide a water base coating material composition which will form a coating film of superior flat finishing properties, and to provide a process for producing the composition in a highly efficient manner.
These and other features of the invention will become apparent from a consideration of the detailed description.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
Not applicable.
DETAILED DESCRIPTION OF THE INVENTION
The water base coating material composition of the invention contains silicone particles are made up of at least two kinds of silicone particles of different average particle sizes. The process for production of the water base coating material composition of the invention produces the composition by adding an aqueous suspension of silicone particles to a water base coating material composition. The aqueous suspension contains at least two kinds of silicone particles of different average particle sizes.
In the water base coating material composition of the invention, there are no particular limitations regarding the composition, so long as it contains silicone particles, and is prepared by emulsifying or dissolving in water the resin components of a coating material. In addition, upon application, it should form a coating film as a result of curing or drying of the resin components in the coating material due to moisture removal. It can be a room temperature curable composition, room temperature drying composition, or a heat setting compositions. The coating materials referred to herein are ones used for protecting the surface of objects or changing their outside appearance and shape, and include such materials as paints which contain pigments, and materials called coating agents or varnishes which do not contain pigments.
Some representative examples of water based coating material compositions suitable for use according to the invention include polyurethane resin based compositions, alkyd resin based compositions, aminoalkyd resin based compositions containing an amino resin and an alkyd resin, epoxy resin based compositions, acrylic resin based compositions, silicone modified epoxy resin based compositions, silicone modified polyester resin based compositions, and silicone resin based compositions.
In order not to ruin the outside appearance of the coating film, the average particle size of the silicone particles in the water base coating material composition should preferably be 0.1-200 &mgr;m, especially 0.1-100 &mgr;m. The shape of the silicone particles can be spherical, oblate, or amorphous. It is preferably spherical or oblate, and is especially spherical, which imparts superior flat finish properties to the coating film and dispersibility in the water base coating material composition. The consistency of the silicone particles can be rubbery, gel like, or resin like, but it is preferably rubbery or resin like.
The water base coating material composition contains at least two kinds of silicone particles of different average particle sizes. They comprise silicone particles with an average particle size of 0.1-4 &mgr;m exclusive of 4 &mgr;m, and silicone particles with an average particle size of 4-200 &mgr;m. Preferably, the silicone particles comprise silicone particles with an average particle size of 0.1-3.5 &mgr;m and silicone particles with an average particle size of 4-200 &mgr;m; and especially silicone particles with an average particle size of 0.1-3.5 &mgr;m and silicone particles with an average particle of 4 &mgr;m to 100 &mgr;m.
The consistency of the silicone particles of smaller average particle size can be rubbery or resin like, and the consistency of the silicone particles of the larger average particle size can be rubbery. However, to impart excellent scratch resistance to coating films, it is preferable for both consistencies to be rubbery. The proportion of silicone particles of smaller average particle size and silicone particles of larger average particle size, in terms of weight ratio, is 0.1:1 to 1:0.1, preferably 0.2:1 to 1:0.2, especially 0.5:1 to 1:0.5.
The silicone particles may be prepared by any process, and among some examples of processes that can be used are (i) silicone resin, i.e., silsesquioxane, particles prepared by subjecting hydrolyzable silanes such as organotrihalosilane and organotrialkoxysilane to a hydrolytic condensation reaction using a catalyst; (ii) silicone rubber particles prepared by subjecting a silicone composition of alkenyl containing polyorganosiloxanes and polyorganosiloxanes that contain silicon bonded hydrogen atoms to emulsification and addition polymerization in an aqueous solution of surface active agent; and (iii) silicone particles prepared by subjecting a silicone composition of silanol containing polyorganosiloxanes, polyorganosiloxanes containing silicon bonded hydrogen atoms or silicon compounds containing silicon bonded hydrolyzable groups, and optionally an organosilicon compound containing organic functional groups and silicon bonded hydrolyzable groups, to emulsification and condensation in an aqueous solution of surface active agent. Process (iii) is especially preferable.
In process (iii), the silanol containing polyorganosiloxane is the primary component of the silicone composition and has at least two silanol groups per molecule. The molecular structure of the polyorganosiloxane can be linear, branched, or network, but the structure is preferably linear and partially branched. The silanol groups are preferably bonded to terminal ends of the molecular chain. Among organic groups bonded to silicon atoms in the polyorganosiloxane are substituted or unsubstituted monovalent hydrocarbon groups including alkyl groups such as methyl, ethyl, propyl, and butyl; alkenyl groups such as vinyl and allyl; aryl groups such as phenyl; aralkyl groups such as benzyl and phenethyl; cycloalkyl groups such as cyclopentyl and cyclohexyl; and halogentated alkyl groups such as 3-chloropropyl and 3,3,3-trifluoropropyl.
The polyorganosiloxane containing silicon bonded hydrogen atoms or the silicon compound having silicon bonded hydrolyzable groups is the component of the composition used for crosslinking with the silanol containing polyorganosiloxane. It should contain at least three silicon bonded hydrogen atoms per molecule. The organic groups bonded to silicon atoms in this polyorganosiloxane can be the same as the organic groups in the silanol containing polyorganosiloxane noted above. Its molecular structure can be linear, partially branched linear, branched, network, or cyclic.
This polyorganosiloxane is exemplified by polymethylhydrogensiloxanes having both terminals of the molecular chain endblocked with trimethylsiloxy groups; copolymers of methylhydrogensiloxane and dimethylsiloxane having both terminals of the molecular chain end blocked with trimethylsiloxy groups; copolymers of methylhydrogensiloxane and di
Kobayashi Kazuo
Morita Yoshitsugu
Tanaka Ken
DeCesare Jim L.
Dow Corning Toray Silicone Co. Ltd.
Yoon Tae H.
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