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
2001-11-29
2004-03-16
Moore, Margaret G. (Department: 1712)
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...
C524S268000, C106S287120, C106S287140, C106S287160
Reexamination Certificate
active
06706798
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a water repellent silicone coating agent composition. Specifically, it relates to a water repellent silicone coating agent composition possessing superior flowability and coating properties and capable of forming cured films exhibiting excellent water repellent properties after coating.
BACKGROUND OF THE INVENTION
Typically, water repellent silicone coating agents are used in a state in which their solid matter is diluted with an organic solvent, and, as a result of the evaporation of the organic solvent after coating, form cured coating films exhibiting water repellent properties. However, coating agents diluted with a large amount of organic solvent present problems in terms of environmental safety and hygiene, and in recent years they have been gradually phased out. On the other hand, if the amount of the organic solvent combined therewith is small, the viscosity of the coating agent increases, and as a result its flowability and coating properties decrease, which makes obtaining a uniform coating film more difficult. For these reasons, there is demand for silicone coating agents that are capable of forming cured films exhibiting excellent water repellent properties after coating and which possess superior flowability and coating properties even without using a large amount of organic solvent.
It is an object of the present invention to provide a water repellent silicone coating agent composition possessing superior flowability and coating properties and capable of forming cured films exhibiting excellent water repellent properties after coating.
SUMMARY OF THE INVENTION
The present invention is a water repellent silicone coating agent composition comprising
(A) 100 parts by weight of diorganopolysiloxane having a viscosity of 20 to 20,000 mPa·s at 25° C. in which the terminal ends of the molecular chain are blocked by silanol groups or silicon-bonded hydrolyzable groups,
(B) 5 to 100 parts by weight of a cross-linking agent represented by general formula R
a
SiX
4-a
, in which R is a monovalent hydrocarbon group comprising 1 to 10 carbon atoms, X is a hydrolyzable group, and subscript a is an integer of 0 to 2,
(C) 0.1 to 20 parts by weight of a condensation reaction catalyst,
(D) 8 to 50 parts by weight of a hydrophobic surface treated dry process silica having a carbon content of 3.7 to 5% by weight and a bulk density of 40 to 99 g/L, or a hydrophobic surface treated dry process silica having a carbon content of 2.7 to 5% by weight and a bulk density of 100 to 300 g/L,
(E) 1 to 10 parts by weight of an organic functional silane coupling agent-based adhesion-imparting agent,
(F) an organic solvent having a boiling point of 100 to 200° C. in an amount of 4 to 100 wt % based on the total of component (A) to component (E), and optionally
(G) 1 to 50 parts by weight of a non-reactive silicone fluid having a viscosity of 10 to 10,000 mPa·s at 25° C.
DESCRIPTION OF THE INVENTION
The present invention is a water repellent silicone coating agent composition comprising
(A) 100 parts by weight of diorganopolysiloxane having a viscosity of 20 to 20,000 mPa·s at 25° C. in which the terminal ends of the molecular chain are blocked by silanol groups or silicon-bonded hydrolyzable groups,
(B) 5 to 100 parts by weight of a cross-linking agent represented by general formula R
a
SiX
4-a
, in which R is a monovalent hydrocarbon group comprising 1 to 10 carbon atoms, X is a hydrolyzable group, and subscript a is an integer of 0 to 2,
(C) 0.1 to 20 parts by weight of a condensation reaction catalyst,
(D) 8 to 50 parts by weight of a hydrophobic surface treated dry process silica having a carbon content of 3.7 to 5% by weight and a bulk density of 40 to 99 g/L, or a hydrophobic surface treated dry process silica having a carbon content of 2.7 to 5% by weight and a bulk density of 100 to 300 g/L,
(E) 1 to 10 parts by weight of an organic functional silane coupling agent-based adhesion-imparting agent,
(F) an organic solvent having a boiling point of 100 to 200° C. in an amount of 4 to 100 wt % based on the total of component (A) to component (E), and optionally
(G) 1 to 50 parts by weight of a non-reactive silicone fluid having a viscosity of 10 to 10,000 mPa·s at 25° C.
Hereinbelow, the present invention is explained in detail. Component (A) is a diorganopolysiloxane having a viscosity of 20 to 20,000 mPa·s at 25° C. in which the terminal ends of the molecular chain are blocked by silanol groups or silicon-bonded hydrolyzable groups and is the primary component of the present composition. Suggested hydrolyzable groups include dimethyl ketoxime, methyl ethyl ketoxime, and other diorganoketoxime groups; methoxy, ethoxy, and other alkoxy groups; acetoxy, and other acyloxy groups; N-butylamino and other organoamino groups; methylacetoamido and other organoacylamido groups; N,N-diethylhydroxyamino and other N,N-diorganohydroxyamino groups; and propenoxy, and other alkenyloxy groups. Among these, alkoxy groups are preferable. In addition, organic groups bonded to silicon atoms in the diorganopolysiloxane are exemplified by unsubstituted monovalent hydrocarbon groups such as methyl, ethyl, propyl, and other alkyl groups; vinyl, allyl, and other alkenyl groups; phenyl, and other aryl groups; and by 3,3,3-trifluoropropyl, nonafluorohexyl, and other halogen atom-substituted hydrocarbon groups. Dimethylpolysiloxane having both terminal ends of the molecular chain blocked by silanol groups or methoxy groups is preferable as the diorganopolysiloxane of component (A). The viscosity of component (A) is 20 to 20,000 mPa·s and preferably 40 to 15,000 mPa·s at 25° C.
Component (B) is a cross-linking agent represented by general formula R
a
Si
4-a
in which R is a monovalent hydrocarbon group comprising 1 to 10 carbon atoms exemplified by methyl, ethyl, propyl, tert-butyl, 2-ethylhexyl, and other alkyl groups; vinyl, allyl, and other alkenyl groups; and phenyl and other aryl groups. Among these, alkyl groups and alkenyl groups are preferable and methyl is especially preferable. X is a hydrolyzable group exemplified by dimethyl ketoxime, methyl ethyl ketoxime, and other diorganoketoxime groups; methoxy, ethoxy, and other alkoxy groups; acetoxy, and other acyloxy groups; N-butylamino and other organoamino groups; methylacetoamido and other organoacylamido groups; N,N-diethylhydroxyamino and other N,N-diorganohydroxyamino groups; and propenoxy, and other alkenyloxy groups. The subscript a is an integer of 0 to 2. Suggested examples of component (B) include tetrakis(methylethylketoxime)silane, methyl tris(methylethylketoxime)silane, vinyl tris(methylethylketoxime)silane, methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, methyltriacetoxysilane, tetramethoxysilane, tetraethoxysilane, methyltriisopropenoxysilane, tetraisopropenoxysilane, and methyl tri(N,N-diethylamino)silane. The amount of component (B) in the present composition is 5 to 100 parts by weight per 100 parts by weight of component (A), and from the standpoint of curability preferably in the range of from 8 to 40 parts by weight on the same basis.
The condensation reaction catalyst of component (C) can be a well-known prior-art silanol condensation catalyst including dibutyltin diacetate, dibutyltin dioctoate, dibutyltin dilaurate, dibutyltin dimalate, dioctyltin dilaurate, dioctyltin dimalate, tin octylate, and other organotin compounds; isopropyltriisostearoyl titanate, isopropyltris(dioctylpyrophosphato)titanate, bis(dioctylpyrophosphato)oxyacetato titanate, tetraalkyl titanate, and other organotitanate compounds; tetrabutyl zirconate, tetrakis(acetylacetonato)zirconium, tetraisobutyl zirconate, butoxytris(acetylacetonato)zirconium, zirconium nathphenate, and other organozirconium compounds; tris(ethylacetoacetato)aluminum, tris(acetylacetonate)aluminum, and other organoaluminum compounds; zinc naphthenate, cobalt naphthenate, cobalt octylate, and other organometallic catalysts; diethanolamine, triethanolamine, and other amine-series catalysts that do
Kobayashi Hideki
Sasaki Motoshi
DeCesare Jim L.
Dow Corning Toray Silicone Co. Ltd.
Moore Margaret G.
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