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...
Patent
1996-02-26
1998-01-27
Niland, Patrick
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...
523406, 523408, 523409, 523411, 524515, 524522, 524523, 524547, 525 72, 525100, 525101, 525108, C08J 300, C08K 320, C08K 310, C08L 3300
Patent
active
057123403
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a highly stable emulsion or aqueous dispersion of copolymer having a hydrolyzable silyl group.
BACKGROUND ART
Among coating compositions for paints, aqueous solution-based ones are replacing solvent solution-based ones in consideration of low-pollution, resource conservation, safety and sanitation. Research has been actively conducted on reactive emulsions, which are expected to provide improved properties including water resistance. Resin emulsions having a hydrolyzable silyl group are known as one kind of the reactive emulsions. For example, an aqueous dispersion of copolymer having a hydrolyzable silyl group, which is obtained by copolymerizing a polymerizable monomer having a hydrolyzable silyl group and methacrylate in a conventional emulsifier such as lauryl sodium sulfate, is disclosed in Japanese Patent Application Laid-Open No. 61-9463. A method of producing the dispersion using a radical-polymerizable emulsifier is also known. Further, an aqueous dispersion of a vinyl polymer having a hydrolyzable silyl group and an aminimide group in a molecule is disclosed in the recent U.S. Pat. No. 5,306,765.
Nevertheless, when a conventional non-polymerizable emulsifier is used, the storage stability becomes insufficient. Also, an emulsion of a resin having a hydrolyzable silyl group produced with a radically polymerizable emulsifier has a good storage stability only when it contains a small amount of a hydrolyzable silyl group, but as the amount increases the storage stability deteriorates and the problem of polymerization stability occurs, such as the generation of gel at the time of polymerization. Besides, the emulsion's mechanical stability is insufficient. The mechanical stability denotes an aqueous dispersion's resistance to the phenomenon where the dispersed state is destroyed and the dispersoid aggregates when a physical force such as stirring or vibration is applied to the aqueous dispersion.
The inventors of the present invention achieved the present invention by seeking to obtain an emulsion or an aqueous dispersion (hereinafter described as dispersion) of a polymer having a hydrolyzable silyl group, which has excellent polymerization stability, mechanical stability and storage stability even when the amount of a hydrolyzable silyl group contained therein is high.
DISCLOSURE OF INVENTION
The present invention relates to an aqueous dispersion of polymer composition having a hydrolyzable silyl group, comprising (A) a copolymer which comprises (a.sub.1) a unit derived from a vinyl monomer having a hydrolyzable silyl group and (a.sub.2) a unit derived from another vinyl monomer copolymerizable with (a.sub.1) and (B) a water-soluble polymer having an amineimide group.
BEST MODE FOR CARRYING OUT THE INVENTION
In this invention, examples of a hydrolyzable silyl group of (a.sub.1) vinyl monomer include a halogenosilyl group (examples of a halogen include chlorine and bromine), an acyloxysilyl group (with an acyloxy group of from 1 to 17 carbon atoms), an amidosilyl group (where R of the RCONH-- group is an alkyl group of from 1 to 17 carbon atoms), an aminoxysilyl group (where R.sup.1 and R.sup.2 of the R.sup.1 R.sup.2 NO-- group are an alkyl group of the same or different number of carbon atoms from 1 to 8), an alkenyloxysilyl group (with an alkenyl group of from 3 to 8 carbon atoms), an aminosilyl group (where R.sup.1 and R.sup.2 of the R.sup.1 R.sup.2 N-- group are hydrogen or an alkyl group of from 1 to 8 carbon atoms, and R.sup.1 and R.sup.2 may either be the same or different), an alkylideneiminooxysilyl group (with an alkylidene group of from 2 to 8 carbon atoms), an alkoxysilyl group (with an alkoxy group of from 1 to 18 carbon atoms) and a thioalkoxysilyl group (with an alkoxy group of from 1 to 18 carbon atoms). Among them, an alkoxysilyl group is preferable.
Examples of (a.sub.1) include those disclosed in the U.S. Pat. No. 5,306,765 or the Japanese Patent Application Laid-Open No. 5-25354 such as vinyl silanes (vinyl methyl dimethoxy
REFERENCES:
patent: 5306735 (1994-04-01), Kuriyama et al.
Gyotoku Hiroaki
Kuriyama Satoshi
Murata Kaoru
Ohsumi Tatsuya
Niland Patrick
Sanyo Chemical Industries Ltd.
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