Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1996-12-20
1998-02-17
Zitomer, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
525446, 525449, 525523, 525524, 526319, 5263075, 5263297, 526330, 526342, 526347, C08F22020, C08L 3304
Patent
active
057192464
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an acrylic copolymer. More specifically, it relates to an acrylic copolymer and a polymer composition thereof having a long pot life, and excellent abrasion resistance, chemical resistance, flexibility and the like, when applied to a paint.
BACKGROUND ART
Acrylic copolymers have been widely used for paints, inks, adhesives, and synthesized leathers and the like due to their excellent weather resistance, flexibility, strength and adhesive properties. Particularly, when used as a paint, various acrylic copolymers with different compositions suited for diverse requirements have been prepared and used for coating various materials used in the field of automobiles, electric home appliances, building materials and the like. In order to improve the abrasion resistance, chemical resistance and weather resistance of acrylic copolymers, it is conventionally known to blend an acrylic copolymer containing a hydroxyl group which is obtained by copolymerization of an acrylic monomer and a monomer containing a hydroxyl group with a crosslinking agent which is selected from the group consisting of a polyisocyanate compound, amino resin, epoxy compound, silane compound and metal chelate and then carrying out a crosslinking reaction (Shinzo Yamashita, Tosuke Kaneko, "Crosslinking Agents Handbook" Published by Taiseisha (1981)). In this case, as a monomer containing a hydroxyl group, hydroxyalkylene acrylate such as 2-hydroxyethyl acrylate (HEA), 2-hydroxyethyl methacrylate (HEMA), 2-hydroxypropyl acrylate (HPA) and 2-hydroxypropyl methacrylate (HPMA) is used. However, in the case of HPA and HPMA, the reactivity of the hydroxyl group bonded to a secondary carbon is low and in the case of HEA and HEMA, the hydroxyl group is bonded to a primary carbon, but the position is near to the main chain and has low degree of freedom. Thus it is difficult for the reaction to proceed rapidly after the crosslinking reaction proceeds. Accordingly, none of them can provide an ideally crosslinked product under normal conditions.
Therefore, in order to raise the reactivity of the hydroxyl group to be introduced to the acrylic copolymer, use of 4-hydroxybutyl acrylate (4HBA), 4-hydroxybutyl methacrylate (4HBMA) and a (meth)acrylate of polytetramethylene glycol, and the addition products of caprolactone to HEA, HEMA and the like have been proposed in some methods (Japanese Patent Publication No.3-7433. Japanese Patent LAid-open No.61-43623, and Japanese Patent Laid-open No.2-305873). However, these substances also cause such problems as insufficient hardness due to the flexibility of the side chain, decreased strength due to over large interbridge molecular weight, and greatly deteriorated weather resistance due to the polyester structure, and have not yet fulfilled the performances required.
PROBLEMS TO BE SOLVED BY THE INVENTION
An object of the present invention is to provide an acrylic copolymer having excellent abrasion resistance, and chemical resistance, at the same time having excellent flexibility, and long pot life, which can be most suitably used as a paint.
Another object of the present invention is to provide an acrylic copolymer composition which can be used not only for paint, but also for ink binders, coating materials for woven or non-woven fabrics, adhesives, sealers, potting compounds and the like.
Still another object of the present invention is to provide a paint which can provide a crosslinked coat having excellent strength, abrasion resistance, chemical resistance, heat resistance, weather resistance, hydrolysis resistance, flexibility and the like.
SUMMARY OF THE INVENTION
As a result of intensive study carried out in order to solve the above-mentioned problems, the present inventors found out that the above-mentioned objectives can be accomplished with an acrylic copolymer comprising an acrylic monomer having a specific structure and another ethylenic unsaturated monomer, and completed the present invention.
Accordingly, first aspect of the present invention is
REFERENCES:
patent: 3856830 (1974-12-01), Kuehn
patent: 3954714 (1976-05-01), Kuehn
patent: 4181785 (1980-01-01), Chattha
patent: 4605719 (1986-08-01), Peelen
Soejima Yuji
Taniguchi Yasuyuki
Mitsubishi Chemical Corporation
Zitomer Fred
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