US 5,627,240 A · Low-temperature curable composition

Abstract

Disclosed is a low-temperature curable composition comprising: (a) an acrylic polymer having a molecular weight of 2,000 to 10,000, which has an acyl carbamate group, and (b) a lactone-modified polyol having a molecular weight of 200 to 20,000 in such an amount that a molar ratio of the acyl carbamate group to a hydroxyl group becomes 0.5 to 2.0. The low-temperature curable composition is useful for a binder of a paint for use in plastics.

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Claims9

Dependent claims

A low-temperature curable composition comprising:

(a) an acyl carbamate group-containing acrylic polymer having repeating units represented by the formula:
##STR10## wherein, R.sub.1 is a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms;
R.sub.2 is an alkyl group having 1 to 12 carbon atoms;
an alkoxycarbonylalkyl group having 1 to 12 carbon atoms;
an alkoxyalkyl group having 1 to 12 carbon atoms;
an acyl alkyl group having 1 to 12 carbon atoms;
an alkyleneimino group (RR'C.dbd.N--) having 1 to 12 carbon atoms;
an aryl group having 6 to 25 carbon atoms;
and an aralkyl group having 7 to 12 carbon atoms;
and the formula:
##STR11## wherein, P, Q, Y and Z is independently a member selected from the group consisting of hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, an aryl group having not more than 10 carbon atoms, an aralkyl group having not more than 10 carbon atoms, a halogen atom, a cyano group and --COOR.sub.a, in which R.sub.a is an alkyl group having 1 to 20 carbon atoms, an aryl group having not more than 10 carbon atoms, or an aralkyl group, having not more than 10 carbon atoms;
wherein, the acyl carbamate group-containing acrylic polymer is composed of m repeating units of the formula (I) in which m is a positive integer and n repeating units of the formula (II) in which n is 0 or a positive integer, and has an acyl carbamate group content of 0.5 to 6.5 mmol/g and a number average molecular weight of 2,000 to 10,000;
and
(b) a lactone-modified polyol having a number molecular weight of 200 to 20,000, represented by the formula:
##STR12## wherein A is a residue of a polyol;
k is an integer of 1 to 5;
1 is an integer of 1 to 3;
and x is an integer of not less than 2;
wherein the low-temperature curable composition comprises the acyl carbamate group-containing acrylic polymer (a) and the lactone-modified polyol (b) in an amount that a mol ratio of acyl carbamate groups to hydroxyl groups becomes 0.5 to 2.0.

16 more elements

Dependencies are inferred from the claim text.

Description6,381 words

Summary3,932 words

#The present invention relates to a curable composition. More particularly, it relates to a low-temperature curable composition which is suitable for a binder of a paint for plastics.

#A large quantity of plastics has recently been used, and a demand for a paint for use in plastics have been increasing. The paint for plastics is generally required to cure at low-temperature and to provide a coated film superior in hardness, flexibility and acid resistance.

#A two-package urethane paint has hitherto widely been used for plastics, because it cures at low-temperature and forms an acid resistant coated film. However, the two-package urethane paint has a problem that a process for coating is complicated and an isocyanate component is toxic. On the other hand, a melamine paint is superior in workability because it is one-package, but it provides a coated film having poor acid resistance.

Detailed description2,449 words

#The following Examples and Comparative Examples further illustrate the present invention in detail but are not to be construed to limit the scope thereof.

#Preparation of "Polymer A" Having Acyl Carbamate Group

#A 300 ml four-necked flask was equipped with a thermometer, a stirrer, a nitrogen introducing tube and a 200 ml dropping funnel and methyl isobutyl ketone (MIBK, 100 g) was charged in the flask, which was heated to 100.degree. C. N-methacryloyl hexyloxyethyl carbamate (MAHC, 70 g), methyl methacrylate (MMA, 3 g), 2-ethylhexyl acrylate (EHA, 27 g) and N,N'-azobisisobutyronitrile (AIBN, 5 g) were mixed, and the mixture was charged in the 200 ml dropping funnel and added dropwise at constant speed over 90 minutes. After completion of dropping, the mixture was stirred at 100.degree. C. for 30 minutes and 0.5 g of AIBN dissolved in MIBK was added dropwise over about 10 minutes, followed by stirring at 100.degree. C. for 90 minutes to obtain the "polymer A" having acyl carbamate group, having a nonvolatile content of 48%, a polymer conversion ratio of 93%, a number-average molecular weight of 2500, Tg of -15.degree. C. and an acyl carbamate amount of 2.72 mmol/g.

Facts

Application

08/579,257Filed 27 Dec 1995

Priority

JP 6-32684128 Dec 1994

Granted

6 May 1997

Term ended

27 Dec 2015

Estimated · how

20 years from earliest known nonprovisional domestic filing. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination. Patent term adjustment is unavailable; no adjustment was added.

Classification2 codes

C09D 133/062
Of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical: copolymers with…
C09D
Coating compositions

Low-temperature curable composition

Life of this patent

Low-temperature curable composition

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Abstract

Drawings

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Claims9

Description6,381 words

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Classification2 codes

Life of this patent

Description6,381 words