Patent EP-1227113-A1 (EP)
Inventor: OKAZAKI AKIRA
IPC: C08F20/28
Filed: 2000-11-30
Abstract: The present invention Nos. I and II relate to a
hydroxyalkyl(meth)acrylate composition (a) modified by a small amount
of lactones in which a proportion of monomers having two or more
continuous chains (n≧2) of lactone is less than 50% (area % by GPC)
which is obtained by a ring-opening polymerization of a lactone with
a hydroxyalkyl(meth)acrylate, a method for the preparation thereof,
and an acrylic polyol resin using thereof,
 
(in the formula, R, R 1 , R 2 , and R 3  are independently a hydrogen or
a methyl group, "j" is an integer of 2-6, xn pieces of R 4  and R 5  are
independently a hydrogen atom or an alkyl group having a carbon number
of 1-12, "x" is 4-7, "n" is 0 or an integer of not less than 1, and
an average value of "n" in the composition is not less than 0.3 to
less than 1.0). 
     By allowing to react the composition with other ethylenic
unsaturated monomer and to formulate with a commonly-used crosslinking
agent and other commonly-used components, there can be obtained a
well-balanced high quality finishing agent for industries, an
ultraviolet ray- or electron beam-curable coating agent, a composition
which can be modified for a reactive improver, etc., and an acrylic
polyol resin using thereof. 
     The present invention No. III relates to a curable resin 
composition containing 0.5-80 parts by weight of an acrylic polyol
resin (A) obtained using a hydroxyalkyl(meth)acrylate composition (a)
modified by a small amount of lactones and 0.5-50 parts by weight of
a melamine resin (B) [total of the (A) and (B) does not exceed 100
parts by weight] as essential components. 
     By the composition, even in a melamine-based curing system which
is low in price, there can be obtained a curable-type coating composition
in which an acid resistance is improved and highly well-balanced between
an acid resistance and abrasion resistance, and which is also excellent
in flexural resistance and adhesion in recoating. 
     The present invention No. IV relates to a curable resin composition
containing 0.5-80 parts by weight of an acrylic polyol resin (A)
containing a hydroxyalkyl(meth)acrylate composition (a) modified by
a small amount of lactones as a polymerizing component and 0.5-50 parts
by weight of a melamine resin (B) [total of the (A) and (B) does not
exceed 100 parts by weight] as essential components. 
     By the composition, even in a melamine-based curing system which
is low in price, there can be obtained a curable-type coating composition
in which an acid resistance is improved and highly well-balanced between
an acid resistance and abrasion resistance. 
     The present invention No. V relates to a curable resin composition
containing 0.5-80 parts by weight of an acrylic polyol resin (A) obtained
using a hydroxyalkyl (meth)acrylate composition (a) modifiedbya small
amount of lactones and 0.5-50 parts by weight of a polyisocyanate
compound (B) [total of the (A) and (B) does not exceed 100 parts by
weight] as essential components.  
     By the composition, even in an isocyanate-based curing system,
there can be obtained a curable-type coating composition in which a
pot life is long and workability is improved, and which is highly
well-balanced between an acid resistance and abrasion resistance, and
which can provide a coating layer which is excellent also in flexural
resistance and adhesion in recoating. 
     The present invention No. VI relates to a curable resin composition
containing 0.5-80 parts by weight of an acrylic polyol resin (A) obtained
using a hydroxyalkyl(meth)acrylate composition (a) modified by a small
amount of lactones and 0.5-50 parts by weight of a polyisocyanate
compound (B) [total of the (A) and (B) does not exceed 100 parts by
weight] as essential components. 
     By the composition, even in an isocyanate-based curing system,
there can be obtained a curable-type coating composition in which a
pot life is long and workability is improved, and which is highly
well-balanced between an acid resistance and abrasion resistance, and
which can provide a coating layer which is excellent also in flexural
resistance and adhesion in recoating. 
     The present invention No. VII relates to a thermosetting resin
composition containing 2-50 parts of an acrylic polyol resin obtained
using a hydroxyalkyl(meth)acrylate composition (a) modified by a small
amount of lactones and 30-80 parts of an acrylic copolymer having an
alkoxysilyl group. 
     By the composition, there can be obtained a thermosetting resin 
composition in which crosslinking density is elevated and hardness
and abrasion resistance are improved as well as solving a problem of
acid resistance and odor. 
     The present invention No. VIII relates to a carboxylic
group-contained acrylate composition (a') modified by a small amount
of lactones represented by a formula described below by allowing to
react a hydroxyalkyl(meth)acrylate composition (a) modified by a small
amount of lactones with a carboxylic anhydride,
 
(in the formula, R, R 1 , R 2 , and R 3  are independently a hydrogen or
a methyl group, "j" is an integer of 2-6, xn pieces of R 4  and R 5  are
independently a hydrogen atom or an alkyl group having a carbon number
of 1-12, "x" is 4-7, "n" is 0 or an integer of not less than 1, an
average value of "n" in the composition is not less than 0.3 to less
than 1.0, R 6  is a residual group of a carboxylic acid, and "m" is an
integer of 1-3), and relates to a method for the preparation thereof. 
     By the method, there can be readily, efficiently, and economically
obtained the carboxylic group-contained acrylate monomer composition
modified by a small amount of lactones. 
     The present invention No. IX relates to a curable resin composition
containing 10-70 parts of an acrylic polycarboxylic resin essentially
containing the carboxylic group-contained hydroxy(meth)acrylate 
monomer composition (a') modified by a small amount of lactones as
a polymerizing component and. 0.5-80 parts of a polyepoxide. 
     By the composition, there can be obtained a curable-type resin
composition which can form a coating layer which is excellent in acid
resistance, abrasion resistance, yellowing resistance, and outer
appearance, and which is curable at a low temperature. 
     The present invention No. X relates to a polyester unsaturated
monomer (a'') modified by a small amount of lactones in which less
than 1 mol of ε-caprolactone is allowed to react with 1 mol of a radically
polymerizable unsaturated monomers containing carboxylic group under
the presence of an acidic catalyst, and relates to a method for the
preparation thereof. By the method, there can be readily and
industrially prepared the monomer in a short step.