US 7,253,251 B2 · Water soluble thermosetting polyester resin composition and method of preparing the same

Abstract

A water soluble thermosetting polyester resin composition for undercoating a PCM steel sheet is prepared from about 100 parts by weight of thermosetting polyester resin obtained by condensing polyethylene terephthalate using glycol and polybasic acid, about 5-20 parts by weight of anhydrous polybasic acid and amine. A paint composition prepared using thus prepared resin composition is applicable for undercoating PCM steel sheet for both of home appliances and construction materials. In addition, an organic solvent included in the conventional oily paint composition can be excluded to minimize an environmental contamination, a dangerous factor of initiating fire and a bodily harm on human. Further, a paint composition having advantageous processibility, chemical resistance, solvent resistance, adhesion and scratch resistance may be prepared.

Claims12

Dependent claims

A water soluble thermosetting polyester resin composition for undercoating a pre-coated metal steel sheet, prepared by:

reacting terephthalic acid with ethylene glycol in a molar ratio of terephthalic acid to ethylene glycol of about 1:1 to about 1:1.4 to produce polyethylene terephthalate;
condensing the polyethylene terephthalate with a glycol and a polybasic acid to produce a thermosetting polyester resin;
reacting about 100 parts by weight of the thermosetting polyester resin with about 5-to about 20 parts by weight of an anhydrous polybasic acid to produce a product;
and
adding an amine into the product until the pH of the product is about 7 to about 9.

2 more elements

A method of preparing a water soluble thermosetting polyester resin composition for undercoating a pre-coated metal steel sheet, comprising:

reacting terephthalic acid with ethylene glycol in a molar ratio of terephthalic acid to ethylene glycol of about 1:1 to about 1:1.4 to produce polyethylene terephthalate;
condensing the polyethylene terephthalate with a glycol and a polybasic acid to produce a thermosetting polyester resin;
reacting about 100 parts by weight of the thermosetting polyester resin with about 5 to about 20 parts by weight of an anhydrous polybasic acid through a ring opening addition or condensation polymerization reaction to produce a product;
and
adding an amine into the product for neutralization until the pH of the product is about 7 to about 9.

2 more elements

Dependencies are inferred from the claim text.

Water soluble thermosetting polyester resin composition and method of preparing the same

Life of this patent

Water soluble thermosetting polyester resin composition and method of preparing the same

Life of this patent

Abstract

Claims12