US 4,205,115 AGranted

Polyester coating composition

AssigneePPG Industries, Inc.

InventorsRobert M. Piccirilli, Wen-Hsuan Chang, David T. McKeough, Samuel Porter, Jr.

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Abstract

Coating compositions having a high degree of elasticity, as well as toughness, durability and good metallic pigment pattern control are disclosed. This combination of properties makes the coatings particularly desirable for use on elastomeric substrates such as those associated with automobiles. The coating compositions comprise as a resinous component, an ungelled hydroxyl-containing polyester of high weight average molecular weight. The polyesters can be cured with a curative such as an aminoplast to give coatings having outstanding elastomeric properties and good pigment dispersibility, particularly good metallic pigment pattern control, properties not normally associated with polyesters for use in coating applications.

Claims25

Dependent claims

In a coating composition comprising a resinous binder and optionally pigment and diluent in an amount sufficient to provide the coating composition with a sufficient viscosity for coating, the improvement comprising:

using as the resinous binder an ungelled polyester having a hydroxyl value of 10-160 and a weight average molecular weight of about 50,000 to 300,000 as determined by gel permeation chromatography using a polystyrene standard, formed from reacting:
(A) 10 to 70 percent by weight of a difunctional active hydrogen component having two active hydrogens per molecule selected from the class consisting of hydroxyl, primary amine and secondary amine, said active hydrogen component comprising:
(1) 10 to 60 percent by weight of an acrylic diol having a carbon to oxygen ratio of at least 2,
(2) up to 60 percent by weight of a cyclic diol,
(3) up to 20 percent by weight of a compound selected from the class consisting of diamines and hydroxyl-containing amines;
(B) 25 to 85 percent by weight of a dicarboxylic acid component comprising:
(1) 5 to 85 percent by weight of an acyclic dicarboxylic acid containing from 2 to 36 carbon atoms,
(2) up to 80 percent by weight of a cyclic dicarboxylic acid;
(C) up to 30 percent by weight of an active hydrogen component having at least three active hydrogens per molecule, the active hydrogens being selected from the class consisting of hydroxyl, primary amine, secondary amine and carboxylic acid;
(D) up to 20 percent by weight of a monoamino monocarboxylic acid;
the percentages by weight being based on total weight of (A), (B), (C) and (D), the percentages of the reactants being adjusted such that the weight percentages of cyclic moieties in said polyester plus the weight percentages of amide moieties formed in said polyester multiplied by 4 is up to 35 and the weight percentages of the reactants being further adjusted such that these reactants contain about 0.01 to 1.0 gram-mole of reactants having a functionality of 3 or more per 500 grams of reactants.

8 more elements

using as the resinous binder an ungelled polyester having a hydroxyl value of 10-160 and a weight average molecular weight of about 50,000 to 300,000 as determined by gel permeation chromatography using a polystyrene standard, formed from reacting:
(A) 10 to 70 percent by weight of a difunctional active hydrogen component having two active hydrogens per molecule selected from the class consisting of hydroxyl, primary amine and secondary amine, said active hydrogen component comprising:
(1) 10 to 60 percent by weight of an acyclic diol having a carbon to oxygen ratio of at least 2,
(2) up to 60 percent by weight of a cyclic diol,
(3) up to 20 percent by weight of a compound selected from the class consisting of diamines and hydroxyl-containing amines;
(B) 25 to 85 percent by weight of a dicarboxylic acid component comprising:
(1) 5 to 85 percent by weight of an acyclic dicarboxylic acid containing from 2 to 36 carbon atoms,
(2) up to 80 percent by weight of a cyclic dicarboxylic acid;
(C) up to 30 percent by weight of an active hydrogen component having at least three active hydrogens per molecule, the active hydrogens being selected from the class consisting of hydroxyl, primary amine, secondary amine and carboxylic acid;
(D) up to 20 percent by weight of a monoamino monocarboxylic acid;
the percentages by weight being based on total weight of (A), (B), (C) and (D), the percentages of the reactants being adjusted such that the weight percentages of cyclic moieties in said polyester plus the weight percentages of amide moieties formed in said polyester multiplied by 4 is up to 35 and the weight percentages of the reactants being further adjusted such that these reactants contain about 0.1-1.0 gram-mole of reactants having a functionality of 3 or more per 500 grams of reactants;
said polyester being used in combination with a curing agent capable of reacting with the hydroxyl groups to form a crosslinked product.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/897,963Filed 19 Apr 1978
Granted: 27 May 1980
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

C08G 63/20
Dicarboxylic acids and dihydroxy compounds: polyesters having been prepared in the presence of compounds having one reactive group or more than…
C08G 18/4205
Polycondensates having carboxylic or carbonic ester groups in the main chain: containing cyclic groups
C08G 18/4219
Derived from aromatic dicarboxylic acids and dialcohols: from aromatic dicarboxylic acids and dialcohols in combination with polycarboxylic acids…
C08G 18/4615
Having heteroatoms other than oxygen: containing nitrogen