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US 4,147,737 AGranted
Powder coating composition employing mixture of polyepoxide resin with modified polyester resin
AssigneeInternationale Octrooi Maatschappij "Octropa" B.V.
InventorsAnton J. Sein, Johan Reitberg, Johan M. Schouten
Life of this patent
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Abstract
Thermosetting coating compositions for powder coating processes, having a good powder stability, comprise a mixture of 4-25 wt % of a polyepoxide resin, the average molecule of which contains at least two epoxy groups, and 75-96 wt % of a solid modified polyester resin having an acid number of 30-100 and softens in the range of 60.degree. C.-130.degree. C. The solid modified polyester resin is the reaction product of an anhydride of a polybasic, organic carboxylic acid and a polyester having a hydroxyl number of 15-50 derived from a dibasic aromatic carboxylic acid and a specific alcohol component.
Claims28
A homogeneous pulverulent substantially unreacted thermosettable composition comprising a mixture of:
- (1) 4% to 25% by weight of a polyepoxide compound or mixture of compounds, the molecules of which contain an average of at least two epoxy groups, and
- (2) 75.% to 96% by weight of a solid modified polyester resin having an acid number of from 30 to 100, and which softens in the range 60.degree. C. to 130.degree. C., said solid modified polyester resin comprising the reaction product of:
- (a) an anhydride of a polybasic, organic carboxylic acid, and
- (b) a polyester resin having a hydroxyl number of from 15 to 50, the acid component of this polyester resin comprising a dibasic, aromatic carboxylic acid and the alcohol component comprising:
- (c) from 0 to 100 mole % (based on the total alcohol component of the polyester) of an alcohol having the general formula:
- ##STR3## in which R.sup.1 and R.sup.2 represent alkylene groups having from 2 to 4 carbon atoms, R.sup.3 represents a direct bond between the rings or an alkylidene group having from 1 to 4 carbon atoms or a cycloalkylidene group having 6 carbon atoms, or a carbonyl group, or a sulphone group, x and y are numerals each being at least one, the sum of x and y being not greater than 6, and R.sup.4 and R.sup.5 represent a hydrogen atom or alkyl radical having from 1 to 6 carbon atoms;
- (d) from 0 to 40 mole % (based on the total alcohol component of the polyester) of a glycidyl ester of the general formula:
- ##STR4## in which R is a straight or branched chain, saturated or unsaturated hydrocarbon radical having from 4 to 20 carbon atoms, or a substituted or unsubstituted benzene nucleus, and
- (e) from 0 to 100 mole % (based on the total alcohol component of the polyester) of at least one dihydric, aliphatic alcohol,
- the sum of the alcohol components (c), (d), and (e) being 100 mole %, and said composition having a good powder stability.
7 more elements
A homogeneous pulverulent substantially unreacted thermosettable composition comprising a mixture of:
- (1) 4% to 25% by weight of a polyepoxide compound or mixture of compounds, the molecules of which contain an average of at least two epoxy groups, and
- (2) 75% to 96% by weight of a solid modified polyester resin having an acid number of from 40 to 80, and which softens in the range 60.degree. C. to 130.degree. C., said solid modified polyester resin comprising the reaction product of:
- (a) an anhydride of a polybasic, organic carboxylic acid, and
- (b) a polyester resin having a hydroxyl number of from 15 to 40, the acid component of this polyester resin comprising a dibasic, aromatic carboxylic acid and the alcohol component comprising:
- (c) from 0 to 100 mole % (based on the total alcohol component of the polyester) of an alcohol having the general formula:
- ##STR5## in which R.sup.1 and R.sup.2 represent alkylene groups having from 2 to 4 carbon atoms, R.sup.3 represents a direct bond between the rings or an alkylidene group having from 1 to 4 carbon atoms or a cycloalkylidene group having 6 carbon atoms, or a carbonyl group, or a sulphone group, x and y are numerals each being at least one, the sum of x and y being not greater than 6, and R.sup.4 and R.sup.5 represent a hydrogen atom or alkyl radical having from 1 to 6 carbon atoms;
- (d) from 0 to 40 mole % (based on the total alcohol component of the polyester) of a glycidyl ester of the general formula:
- ##STR6## in which R is a straight or branched chain, saturated or unsaturated hydrocarbon radical having from 4 to 20 carbon atoms, or a substituted or unsubstituted benzene nucleus, and
- (e) from 0 to 100 mole % (based on the total alcohol component of the polyester) of at least one dihydric, aliphatic alcohol,
- the sum of the alcohol components (c), (d), and (e) being 100 mole %, and said composition having a good powder stability.
7 more elements
A homogeneous pulverulent substantially unreacted thermosettable composition comprising a mixture of:
- (1) 8% to 15% by weight of a polyepoxide compound or mixture of compounds, the molecules of which contain an average of at least two epoxy groups, and
- (2) 85% to 92% by weight of a solid modified polyester resin having an acid number of from 40 to 80, and which softens in the range 60.degree. to 130.degree. C., said solid modified polyester resin comprising the reaction product of:
- (a) an anhydride of a polybasic, organic carboxylic acid, and
- (b) a polyester resin having a hydroxyl number of from 15 to 40, the acid component of this polyester resin comprising a dibasic, aromatic carboxylic acid and the alcohol component is:
- (c) from 0 to 100 mole % (based on the total alcohol component of the polyester) of an alcohol having the general formula:
- ##STR7## in which R.sup.1 and R.sup.2 represent alkylene groups having 2 or 3 carbon atoms, R.sup.3 represents an alkylidene group having 3 or 4 carbon atoms, x and y are numerals each being at least one, the sum of x and y being not greater than 6 and R.sup.4 and R.sup.5 represent hydrogen atoms, so that the two nuclei are benzene nuclei,
- (d) from 0 to 40 mole % (based on the total alcohol component of the polyester) of a glycidyl ester of the general formula:
- ##STR8## in which R is a branched chain, saturated alkyl group having from 4 to 10 carbon atoms, and
- (e) from 0 to 100 mole % (based on the total alcohol component of the polyester) of at least one dihydric, aliphatic alcohol,
- (f) from 0 to 10 mole % (based on the total alcohol component of the polyester) of at least one aliphatic, at least trihydric alcohol,
- the sum of the alcohol components (c), (d), (e), and (f) being 100 mole %, and said composition having a good powder stability.
8 more elements
Dependencies are inferred from the claim text.