Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2000-04-20
2002-11-05
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S236000
Reexamination Certificate
active
06476108
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an aqueous coating composition. More particularly, the present invention relates to an aqueous coating composition which can be suitably used for coating surfaces of wood, plastics, ceramics, metals, and the like, is safe due to absence of heavy metals, produces excellent gloss and fine external appearance when applied, and exhibits superior durability and water resistance which are represented by properties resistant black heel marks and anti-scuff properties. The aqueous coating composition is particularly useful as a floor coating material.
2. Description of Background Art
Responding to recent regulations which impose certain limitations on the content of volatile organic compounds in floor coating compositions, various aqueous coating compositions have been proposed. For example, Publication of Translation of International Patent Application (Toku-Hyo Hei No. 8-501577 (WO 94/07938) discloses an aqueous coating composition prepared from a dicarboxylic acid, a monocarboxylic acid which contains a metal sulfonate group (containing Cu, Fe, or the like as a heavy metal), glycol, an amino alcohol, and a poly-functional compound which contains 3 or more hydroxyl groups. Because these aqueous coating compositions which contain heavy metals exhibit excellent durability, they are widely used for coating floor materials and the like.
However, in response to an increased concern about environmental problems in recent years under which complete assurance for pollution-free and safe materials is required, aqueous compositions containing no heavy metals are desired as coating compositions for floor materials which inherently should not cause water pollution problems and the like if handled in a well-controlled manner.
Japanese Patent No. 2973060 discloses an aqueous coating composition which is free from heavy metals, but contains an aqueous dispersing material possessing a free carboxyl group which is obtained by emulsion polymerization of an ethylenically unsaturated monomer, an amino alcohol, and an acetic acid ester.
However, these aqueous coating compositions which do not contain heavy metals are intended mainly for coating floors in homes, and are not necessarily satisfactory for coating floors requiring superior durability such as floors in department stores. Specifically, floors of department stores, for example, are not only subjected to severe contact with the shoes of a great number of customers, especially high-heeled shoes for women, but are also required to exhibit a beautiful appearance.
The present invention has been achieved in view of these problems and has an objective of providing an aqueous coating composition which is safe due to absence of heavy metals, produces excellent gloss and has a fine external appearance when coated, exhibits superior durability and water resistance which are represented by properties resistant to black heel marks (hereinafter called “black heel mark resistance”) and anti-scuff properties, and is particularly useful as a floor coating material.
As a result of extensive studies, the present inventors have found that the above object can be achieved by an aqueous coating composition comprising (A) an aqueous dispersing material which is a copolymer having a glass transition temperature (Tg) of 80° C. or less which is obtained by the copolymerization a specific unsaturated carboxylic acid, (meth)acrylic acid alkyl ester, and other monomers and (B) a specific aminoalcohol compound in a specific proportion. This finding has led to the completion of the present invention.
SUMMARY OF THE INVENTION
Specifically, the present invention provides the following aqueous coating compositions.
An aqueous coating composition comprising (A) 100 parts by weight (solid basis) of an aqueous dispersing material which is a copolymer having a glass transition temperature (Tg) of 80° C. or less which is obtained by the copolymerization of (a) 2-40 wt % of &agr;,&bgr;-unsaturated carboxylic acid (monomer (a)), (b) 20-90 wt % of (meth)acrylic acid alkyl ester (monomer (b)), and (c) 0-78 wt % of monomers (monomer (c)) polymerizable with the monomer (a) and monomer (b), and (B) 0.1-100 parts by weight of a compound shown by the following formula (1),
R
3−n
NX
n
(1)
wherein R represents a hydrogen atom, an alkyl group having 1-12 carbon atoms, or an aminoalkyl group having 1-12 carbon atoms, X represents a hydroxyalkyl group having 1-10 carbon atoms, and n is an integer from 1-3, provided that two or more Rs, if present, may be either different or identical and two or more Xs, if present, may be either different or identical.
The aqueous coating composition described in (1) above, further comprising (C) an alkali metal compound in an amount of 0.05-40 parts by weight for 100 parts by weight (solid basis) of the component (A).
Other objects, features and advantages of the invention will hereinafter become more readily apparent from the following description.
DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS
The present invention will now described in more detail by way of embodiments.
The aqueous coating composition of the composition is characterized by comprising (A) an aqueous dispersing material which is a specific copolymer (hereinafter “component (A)”) having a glass transition temperature (Tg) of 80° C. or less and (B) the compound shown by the above formula (1) (hereinafter “component (B)”).
Each component for the aqueous coating composition will now be described in more detail.
1. Component (A)
The component (A) used in the present invention is a copolymer obtained by the copolymerization of (a) 2-40 wt % of &agr;,&bgr;-unsaturated carboxylic acid (hereinafter “monomer (a)”), (b) 20-90 wt % of (meth)acrylic acid alkyl ester (hereinafter “monomer (b)”), and (c) 0-78 wt % of monomers polymerizable with the monomer (a) and monomer (b), and (B) (hereinafter “monomer (c)”).
(1) Monomer (a)
As examples of the monomer (a) used in the present invention, (meth)acrylic acid, fumaric acid, itaconic acid, monoalkyl itaconate, maleic acid, crotonic acid, 2-methacryloyloxyethlhexahydrophtalic acid, and the like can be given. Of these, (meth)acrylic acid is preferred in view of polymerization stability and durability.
These monomer (a) compounds can be used either individually or in combination of two or more.
The amount of the monomer (a) among all monomers is in the range of 2-40 wt %, preferably 5-35 wt %, and more preferably 10-30 wt %. If this amount is less than 2 wt %, the product exhibits only poor durability; if more than 40 wt %, leveling characteristics of the product are impaired.
(2) Monomer (b)
Given as examples of the monomer (b) used in the present invention are methyl(meth)acrylate, ethyl(meth)acrylate, n-propyl(meth)acrylate, i-propyl(meth)acrylate, n-butyl(meth)acrylate, i-butyl(meth)acrylate, n-amyl(meth)acrylate, i-amyl(meth)acrylate, hexyl(meth)acrylate, ethylhexyl(meth)acrylate, i-nonyl(meth)acrylate, decyl(meth)acrylate, hydroxymethyl(meth)acrylate, hydroxyethyl(meth)acrylate, hydroxypropyl(meth)acrylate, hydroxybutyl(meth)acrylate, hydroxyamyl(meth)acrylate, hydroxyhexyl(meth)acrylate, cyclohexyl(meth)acrylate, and the like. Of these, butyl(meth)acrylate and methyl(meth)acrylate are preferred in view of durability and weather resistance.
These monomer (b) compounds can be used either individually or in combination of two or more.
The amount of monomer (b) among all the monomers is in the range of 30-90 wt %, preferably 40-80 wt %, and more preferably 50-70 wt %. If less than 30 wt %, the product has poor water resistance and weather resistance; if more than 90 wt %, glossiness is poor.
(3) Monomer (c)
The following compounds can be given as the monomer (c) compounds used in the present invention:
benzyl(meth)acrylate, phenoxyethyl(meth)acrylate, alkylphenoxyethyl(meth)acrylate, phenoxydiethylene glycol(meth)acrylate, phenoxypolyethylene glycol(meth)acrylate, alkylphenol ethylene oxide(meth)acrylate, alkylphenol propylene oxide(meth)ac
Katou Minoru
Mogi Takeshi
Tsuruoka Katsuhiko
JSR Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Rajguru U K
Seidleck James J.
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