Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-08-13
1999-06-01
Yoon, Tae
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525379, 524507, 524558, 526320, 4273885, 4273935, C08G 1828, C08G 1806, C08C 1922, B05D 500
Patent
active
059089008
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention concerns elasticity imparting agents for paints for imparting a rubber elasticity to paint films, and especially elasticity imparting agents for paints for adding to a paint and improving the scratch resistance of the paint film, a method for their manufacture and paints in which they are used.
BACKGROUND OF THE INVENTION
In recent years, in the field of automobile paints for example, problems have arisen with a loss of quality of the appearance of paint films due to chemical and physical factors such as etching with acid rain and scratching when washing the paint film for example. In order to resolve these problems, acrylic-melamine based top coat paint compositions into which soft segments have been introduced by the conjoint use of .epsilon.-caprolactam modified acrylic resins, specified low molecular weight polyols and alkoxy monomeric melamine have been suggested as essential structural materials for paint films (for example, Japanese Patent Kokai 6466274).
However, with these paint compositions, the paint film is softened because the paint film forming resin itself has been modified with caprolactone and the scratch resistance can be improved, but the acid resistance is reduced because alkoxy monomeric melamine is used, and this is unsatisfactory for dealing with today's severe acid rain.
Furthermore, top coat paint compositions in which .epsilon.-caprolactam modified acrylic resin and non-yellowing type block polyisocyanate compounds are essential components have been suggested for the same purpose (for example, Japanese Patent Kokai H2-305873).
However, although both the scratch resistance and the acid resistance are improved with these paint compositions, the paint films tend in fact to yellow even though only to a slight extent because of the use of the block polyisocyanate compounds as crosslinking agents, even though they are said to be of the non-yellowing type.
SUMMARY OF THE INVENTION
The aim of this present invention is to provide elasticity imparting agents which do not reduce the acid resistance of the paint film, which impart rubber elasticity, with which the scratch resistance of the paint film can be improved, and with which, even in those cases where a block isocyanate is used as a hardening agent for the paint film, the amount used is small and yellowing is unlikely to occur, a method for their manufacture, and paints.
DETAILED DESCRIPTION
The present inventions are the elasticity imparting agents for paints, the method for their manufacture, and the paints indicated below. polymer particles comprised of vinyl based polymer which contains ##STR2## (In this formula, R.sup.1 -R.sup.5 each represent a hydrogen atom or a methyl group, and they may be the same or different. Moreover, m is an integer of value 0-2, n is a number of value 0-10, p is 0 or 1, q is an integer of value 0-3, and r is an integer of value 0-3.) comprised of a liquid non-aqueous polymer dispersion which contains: particles, which are comprised of vinyl based polymer which contains structural units which can be represented by the aforementioned general aforementioned vinyl based polymer; and vinyl based polymer is a crosslinked polymer. described in any of (1)-(3) above, characterized in that vinyl based monomer is polymerized in organic solvent and a dispersion stabilizer formed, and that a vinyl based monomer which can be represented by general polymerized in the reaction solution so obtained and polymer particles are formed. ##STR3## (In this formula, R.sup.1 -R.sup.5 and m, n, p, q and r have the same an elasticity imparting agent for paints as described in any of (1) to (3) above.
In this present invention, "(meth)acrylic" signifies "acrylic or methacrylic".
The elasticity imparting agents for paints of this present invention are agents which contain polymer particles which are comprised of vinyl based polymer which contains structural units which can be represented by the structural molecules of the polymer particles move easily because there are soft segments suc
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Momna Yasuhrio
Shibato Kishio
Sugihara Yasushi
BASF Coatings AG
Yoon Tae
LandOfFree
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